Merge branch 'develop' of JF/PineTime into master

4 files changed, 2091 insertions, 0 deletions

diff --git a/src/libs/mynewt-nimble/nimble/drivers/nrf51/include/ble/xcvr.h b/src/libs/mynewt-nimble/nimble/drivers/nrf51/include/ble/xcvr.h
new file mode 100644
index 00000000..848c8cc8
--- /dev/null
+++ b/src/libs/mynewt-nimble/nimble/drivers/nrf51/include/ble/xcvr.h
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef H_BLE_XCVR_
+#define H_BLE_XCVR_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Transceiver specific defintions */
+/* NOTE: we have to account for the RTC output compare issue */
+#define XCVR_PROC_DELAY_USECS         (230)
+
+#define XCVR_RX_START_DELAY_USECS     (140)
+#define XCVR_TX_START_DELAY_USECS     (140)
+#define XCVR_TX_SCHED_DELAY_USECS     \
+    (XCVR_TX_START_DELAY_USECS + XCVR_PROC_DELAY_USECS)
+#define XCVR_RX_SCHED_DELAY_USECS     \
+    (XCVR_RX_START_DELAY_USECS + XCVR_PROC_DELAY_USECS)
+
+/*
+ * Define HW whitelist size. This is the total possible whitelist size;
+ * not necessarily the size that will be used (may be smaller)
+ */
+#define BLE_HW_WHITE_LIST_SIZE        (8)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* H_BLE_XCVR_ */
diff --git a/src/libs/mynewt-nimble/nimble/drivers/nrf51/pkg.yml b/src/libs/mynewt-nimble/nimble/drivers/nrf51/pkg.yml
new file mode 100644
index 00000000..816a5635
--- /dev/null
+++ b/src/libs/mynewt-nimble/nimble/drivers/nrf51/pkg.yml
@@ -0,0 +1,31 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+pkg.name: nimble/drivers/nrf51
+pkg.description: BLE driver for nRF51 systems.
+pkg.author: "Apache Mynewt <dev@mynewt.apache.org>"
+pkg.homepage: "http://mynewt.apache.org/"
+pkg.keywords:
+    - ble
+    - bluetooth
+
+pkg.apis: ble_driver
+pkg.deps:
+    - nimble
+    - nimble/controller
diff --git a/src/libs/mynewt-nimble/nimble/drivers/nrf51/src/ble_hw.c b/src/libs/mynewt-nimble/nimble/drivers/nrf51/src/ble_hw.c
new file mode 100644
index 00000000..3c7296b8
--- /dev/null
+++ b/src/libs/mynewt-nimble/nimble/drivers/nrf51/src/ble_hw.c
@@ -0,0 +1,488 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include <stdint.h>
+#include <assert.h>
+#include <string.h>
+#include "syscfg/syscfg.h"
+#include "os/os.h"
+#include "ble/xcvr.h"
+#include "nimble/ble.h"
+#include "nimble/nimble_opt.h"
+#include "nrfx.h"
+#include "controller/ble_hw.h"
+#if MYNEWT
+#include "mcu/cmsis_nvic.h"
+#else
+#include "core_cm0.h"
+#include <nimble/nimble_npl_os.h>
+#endif
+#include "os/os_trace_api.h"
+
+/* Total number of resolving list elements */
+#define BLE_HW_RESOLV_LIST_SIZE     (16)
+
+/* We use this to keep track of which entries are set to valid addresses */
+static uint8_t g_ble_hw_whitelist_mask;
+
+/* Random number generator isr callback */
+ble_rng_isr_cb_t g_ble_rng_isr_cb;
+
+/* If LL privacy is enabled, allocate memory for AAR */
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+
+/* The NRF51 supports up to 16 IRK entries */
+#if (MYNEWT_VAL(BLE_LL_RESOLV_LIST_SIZE) < 16)
+#define NRF_IRK_LIST_ENTRIES    (MYNEWT_VAL(BLE_LL_RESOLV_LIST_SIZE))
+#else
+#define NRF_IRK_LIST_ENTRIES    (16)
+#endif
+
+/* NOTE: each entry is 16 bytes long. */
+uint32_t g_nrf_irk_list[NRF_IRK_LIST_ENTRIES * 4];
+
+/* Current number of IRK entries */
+uint8_t g_nrf_num_irks;
+
+#endif
+
+/* Returns public device address or -1 if not present */
+int
+ble_hw_get_public_addr(ble_addr_t *addr)
+{
+    uint32_t addr_high;
+    uint32_t addr_low;
+
+    /* Does FICR have a public address */
+    if ((NRF_FICR->DEVICEADDRTYPE & 1) != 0) {
+        return -1;
+    }
+
+    /* Copy into device address. We can do this because we know platform */
+    addr_low = NRF_FICR->DEVICEADDR[0];
+    addr_high = NRF_FICR->DEVICEADDR[1];
+    memcpy(addr->val, &addr_low, 4);
+    memcpy(&addr->val[4], &addr_high, 2);
+    addr->type = BLE_ADDR_PUBLIC;
+
+    return 0;
+}
+
+/* Returns random static address or -1 if not present */
+int
+ble_hw_get_static_addr(ble_addr_t *addr)
+{
+    int rc;
+
+    if ((NRF_FICR->DEVICEADDRTYPE & 1) == 1) {
+        memcpy(addr->val, (void *)&NRF_FICR->DEVICEADDR[0], 4);
+        memcpy(&addr->val[4], (void *)&NRF_FICR->DEVICEADDR[1], 2);
+        addr->val[5] |= 0xc0;
+        addr->type = BLE_ADDR_RANDOM;
+        rc = 0;
+    } else {
+        rc = -1;
+    }
+
+    return rc;
+}
+
+/**
+ * Clear the whitelist
+ *
+ * @return int
+ */
+void
+ble_hw_whitelist_clear(void)
+{
+    NRF_RADIO->DACNF = 0;
+    g_ble_hw_whitelist_mask = 0;
+}
+
+/**
+ * Add a device to the hw whitelist
+ *
+ * @param addr
+ * @param addr_type
+ *
+ * @return int 0: success, BLE error code otherwise
+ */
+int
+ble_hw_whitelist_add(const uint8_t *addr, uint8_t addr_type)
+{
+    int i;
+    uint32_t mask;
+
+    /* Find first ununsed device address match element */
+    mask = 0x01;
+    for (i = 0; i < BLE_HW_WHITE_LIST_SIZE; ++i) {
+        if ((mask & g_ble_hw_whitelist_mask) == 0) {
+            NRF_RADIO->DAB[i] = get_le32(addr);
+            NRF_RADIO->DAP[i] = get_le16(addr + 4);
+            if (addr_type == BLE_ADDR_RANDOM) {
+                NRF_RADIO->DACNF |= (mask << 8);
+            }
+            g_ble_hw_whitelist_mask |= mask;
+            return BLE_ERR_SUCCESS;
+        }
+        mask <<= 1;
+    }
+
+    return BLE_ERR_MEM_CAPACITY;
+}
+
+/**
+ * Remove a device from the hw whitelist
+ *
+ * @param addr
+ * @param addr_type
+ *
+ */
+void
+ble_hw_whitelist_rmv(const uint8_t *addr, uint8_t addr_type)
+{
+    int i;
+    uint8_t cfg_addr;
+    uint16_t dap;
+    uint16_t txadd;
+    uint32_t dab;
+    uint32_t mask;
+
+    /* Find first ununsed device address match element */
+    dab = get_le32(addr);
+    dap = get_le16(addr + 4);
+    txadd = NRF_RADIO->DACNF >> 8;
+    mask = 0x01;
+    for (i = 0; i < BLE_HW_WHITE_LIST_SIZE; ++i) {
+        if (mask & g_ble_hw_whitelist_mask) {
+            if ((dab == NRF_RADIO->DAB[i]) && (dap == NRF_RADIO->DAP[i])) {
+                cfg_addr = txadd & mask;
+                if (addr_type == BLE_ADDR_RANDOM) {
+                    if (cfg_addr != 0) {
+                        break;
+                    }
+                } else {
+                    if (cfg_addr == 0) {
+                        break;
+                    }
+                }
+            }
+        }
+        mask <<= 1;
+    }
+
+    if (i < BLE_HW_WHITE_LIST_SIZE) {
+        g_ble_hw_whitelist_mask &= ~mask;
+        NRF_RADIO->DACNF &= ~mask;
+    }
+}
+
+/**
+ * Returns the size of the whitelist in HW
+ *
+ * @return int Number of devices allowed in whitelist
+ */
+uint8_t
+ble_hw_whitelist_size(void)
+{
+    return BLE_HW_WHITE_LIST_SIZE;
+}
+
+/**
+ * Enable the whitelisted devices
+ */
+void
+ble_hw_whitelist_enable(void)
+{
+    /* Enable the configured device addresses */
+    NRF_RADIO->DACNF |= g_ble_hw_whitelist_mask;
+}
+
+/**
+ * Disables the whitelisted devices
+ */
+void
+ble_hw_whitelist_disable(void)
+{
+    /* Disable all whitelist devices */
+    NRF_RADIO->DACNF &= 0x0000ff00;
+}
+
+/**
+ * Boolean function which returns true ('1') if there is a match on the
+ * whitelist.
+ *
+ * @return int
+ */
+int
+ble_hw_whitelist_match(void)
+{
+    return (int)NRF_RADIO->EVENTS_DEVMATCH;
+}
+
+/* Encrypt data */
+int
+ble_hw_encrypt_block(struct ble_encryption_block *ecb)
+{
+    int rc;
+    uint32_t end;
+    uint32_t err;
+
+    /* Stop ECB */
+    NRF_ECB->TASKS_STOPECB = 1;
+    /* XXX: does task stop clear these counters? Anyway to do this quicker? */
+    NRF_ECB->EVENTS_ENDECB = 0;
+    NRF_ECB->EVENTS_ERRORECB = 0;
+    NRF_ECB->ECBDATAPTR = (uint32_t)ecb;
+
+    /* Start ECB */
+    NRF_ECB->TASKS_STARTECB = 1;
+
+    /* Wait till error or done */
+    rc = 0;
+    while (1) {
+        end = NRF_ECB->EVENTS_ENDECB;
+        err = NRF_ECB->EVENTS_ERRORECB;
+        if (end || err) {
+            if (err) {
+                rc = -1;
+            }
+            break;
+        }
+    }
+
+    return rc;
+}
+
+/**
+ * Random number generator ISR.
+ */
+static void
+ble_rng_isr(void)
+{
+    uint8_t rnum;
+
+    os_trace_isr_enter();
+
+    /* No callback? Clear and disable interrupts */
+    if (g_ble_rng_isr_cb == NULL) {
+        NRF_RNG->INTENCLR = 1;
+        NRF_RNG->EVENTS_VALRDY = 0;
+        (void)NRF_RNG->SHORTS;
+        os_trace_isr_exit();
+        return;
+    }
+
+    /* If there is a value ready grab it */
+    if (NRF_RNG->EVENTS_VALRDY) {
+        NRF_RNG->EVENTS_VALRDY = 0;
+        rnum = (uint8_t)NRF_RNG->VALUE;
+        (*g_ble_rng_isr_cb)(rnum);
+    }
+
+    os_trace_isr_exit();
+}
+
+/**
+ * Initialize the random number generator
+ *
+ * @param cb
+ * @param bias
+ *
+ * @return int
+ */
+int
+ble_hw_rng_init(ble_rng_isr_cb_t cb, int bias)
+{
+    /* Set bias */
+    if (bias) {
+        NRF_RNG->CONFIG = 1;
+    } else {
+        NRF_RNG->CONFIG = 0;
+    }
+
+    /* If we were passed a function pointer we need to enable the interrupt */
+    if (cb != NULL) {
+#ifndef RIOT_VERSION
+        NVIC_SetPriority(RNG_IRQn, (1 << __NVIC_PRIO_BITS) - 1);
+#endif
+#if MYNEWT
+        NVIC_SetVector(RNG_IRQn, (uint32_t)ble_rng_isr);
+#else
+        ble_npl_hw_set_isr(RNG_IRQn, ble_rng_isr);
+#endif
+        NVIC_EnableIRQ(RNG_IRQn);
+        g_ble_rng_isr_cb = cb;
+    }
+
+    return 0;
+}
+
+/**
+ * Start the random number generator
+ *
+ * @return int
+ */
+int
+ble_hw_rng_start(void)
+{
+    os_sr_t sr;
+
+    /* No need for interrupt if there is no callback */
+    OS_ENTER_CRITICAL(sr);
+    NRF_RNG->EVENTS_VALRDY = 0;
+    if (g_ble_rng_isr_cb) {
+        NRF_RNG->INTENSET = 1;
+    }
+    NRF_RNG->TASKS_START = 1;
+    OS_EXIT_CRITICAL(sr);
+
+    return 0;
+}
+
+/**
+ * Stop the random generator
+ *
+ * @return int
+ */
+int
+ble_hw_rng_stop(void)
+{
+    os_sr_t sr;
+
+    /* No need for interrupt if there is no callback */
+    OS_ENTER_CRITICAL(sr);
+    NRF_RNG->INTENCLR = 1;
+    NRF_RNG->TASKS_STOP = 1;
+    NRF_RNG->EVENTS_VALRDY = 0;
+    OS_EXIT_CRITICAL(sr);
+
+    return 0;
+}
+
+/**
+ * Read the random number generator.
+ *
+ * @return uint8_t
+ */
+uint8_t
+ble_hw_rng_read(void)
+{
+    uint8_t rnum;
+
+    /* Wait for a sample */
+    while (NRF_RNG->EVENTS_VALRDY == 0) {
+    }
+
+    NRF_RNG->EVENTS_VALRDY = 0;
+    rnum = (uint8_t)NRF_RNG->VALUE;
+
+    return rnum;
+}
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+/**
+ * Clear the resolving list
+ *
+ * @return int
+ */
+void
+ble_hw_resolv_list_clear(void)
+{
+    g_nrf_num_irks = 0;
+}
+
+/**
+ * Add a device to the hw resolving list
+ *
+ * @param irk   Pointer to IRK to add
+ *
+ * @return int 0: success, BLE error code otherwise
+ */
+int
+ble_hw_resolv_list_add(uint8_t *irk)
+{
+    uint32_t *nrf_entry;
+
+    /* Find first ununsed device address match element */
+    if (g_nrf_num_irks == NRF_IRK_LIST_ENTRIES) {
+        return BLE_ERR_MEM_CAPACITY;
+    }
+
+    /* Copy into irk list */
+    nrf_entry = &g_nrf_irk_list[4 * g_nrf_num_irks];
+    memcpy(nrf_entry, irk, 16);
+
+    /* Add to total */
+    ++g_nrf_num_irks;
+    return BLE_ERR_SUCCESS;
+}
+
+/**
+ * Remove a device from the hw resolving list
+ *
+ * @param index Index of IRK to remove
+ */
+void
+ble_hw_resolv_list_rmv(int index)
+{
+    uint32_t *irk_entry;
+
+    if (index < g_nrf_num_irks) {
+        --g_nrf_num_irks;
+        irk_entry = &g_nrf_irk_list[index];
+        if (g_nrf_num_irks > index) {
+            memmove(irk_entry, irk_entry + 4, 16 * (g_nrf_num_irks - index));
+        }
+    }
+}
+
+/**
+ * Returns the size of the resolving list. NOTE: this returns the maximum
+ * allowable entries in the HW. Configuration options may limit this.
+ *
+ * @return int Number of devices allowed in resolving list
+ */
+uint8_t
+ble_hw_resolv_list_size(void)
+{
+    return BLE_HW_RESOLV_LIST_SIZE;
+}
+
+/**
+ * Called to determine if the address received was resolved.
+ *
+ * @return int  Negative values indicate unresolved address; positive values
+ *              indicate index in resolving list of resolved address.
+ */
+int
+ble_hw_resolv_list_match(void)
+{
+    uint32_t index;
+
+    if (NRF_AAR->EVENTS_END) {
+        if (NRF_AAR->EVENTS_RESOLVED) {
+            index = NRF_AAR->STATUS;
+            return (int)index;
+        }
+    }
+
+    return -1;
+}
+#endif
diff --git a/src/libs/mynewt-nimble/nimble/drivers/nrf51/src/ble_phy.c b/src/libs/mynewt-nimble/nimble/drivers/nrf51/src/ble_phy.c
new file mode 100644
index 00000000..b7e63297
--- /dev/null
+++ b/src/libs/mynewt-nimble/nimble/drivers/nrf51/src/ble_phy.c
@@ -0,0 +1,1524 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+#include "syscfg/syscfg.h"
+#include "os/os.h"
+#include "ble/xcvr.h"
+#include "nimble/ble.h"
+#include "nimble/nimble_opt.h"
+#include "controller/ble_phy.h"
+#include "controller/ble_phy_trace.h"
+#include "controller/ble_ll.h"
+#include "nrfx.h"
+
+#if MYNEWT
+#include "mcu/nrf51_clock.h"
+#include "mcu/cmsis_nvic.h"
+#else
+#include "core_cm0.h"
+#endif
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_2M_PHY)
+#error LE 2M PHY cannot be enabled on nRF51
+#endif
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_CODED_PHY)
+#error LE Coded PHY cannot be enabled on nRF51
+#endif
+
+/* XXX: 4) Make sure RF is higher priority interrupt than schedule */
+
+/*
+ * XXX: Maximum possible transmit time is 1 msec for a 60ppm crystal
+ * and 16ms for a 30ppm crystal! We need to limit PDU size based on
+ * crystal accuracy. Look at this in the spec.
+ */
+
+/* XXX: private header file? */
+extern uint8_t g_nrf_num_irks;
+extern uint32_t g_nrf_irk_list[];
+
+/* To disable all radio interrupts */
+#define NRF_RADIO_IRQ_MASK_ALL  (0x34FF)
+
+/*
+ * We configure the nrf with a 1 byte S0 field, 8 bit length field, and
+ * zero bit S1 field. The preamble is 8 bits long.
+ */
+#define NRF_LFLEN_BITS          (8)
+#define NRF_S0_LEN              (1)
+
+/* Maximum length of frames */
+#define NRF_MAXLEN              (255)
+#define NRF_BALEN               (3)     /* For base address of 3 bytes */
+
+/* Maximum tx power */
+#define NRF_TX_PWR_MAX_DBM      (4)
+#define NRF_TX_PWR_MIN_DBM      (-40)
+
+/* Max. encrypted payload length */
+#define NRF_MAX_ENCRYPTED_PYLD_LEN  (27)
+#define NRF_ENC_HDR_SIZE            (3)
+#define NRF_ENC_BUF_SIZE            \
+    (NRF_MAX_ENCRYPTED_PYLD_LEN + NRF_ENC_HDR_SIZE + BLE_LL_DATA_MIC_LEN)
+
+/* BLE PHY data structure */
+struct ble_phy_obj
+{
+    uint8_t phy_stats_initialized;
+    int8_t  phy_txpwr_dbm;
+    uint8_t phy_chan;
+    uint8_t phy_state;
+    uint8_t phy_transition;
+    uint8_t phy_rx_started;
+    uint8_t phy_encrypted;
+    uint8_t phy_privacy;
+    uint8_t phy_tx_pyld_len;
+    uint8_t *rxdptr;
+    int8_t  rx_pwr_compensation;
+    uint32_t phy_aar_scratch;
+    uint32_t phy_access_address;
+    struct ble_mbuf_hdr rxhdr;
+    void *txend_arg;
+    ble_phy_tx_end_func txend_cb;
+    uint32_t phy_start_cputime;
+};
+struct ble_phy_obj g_ble_phy_data;
+
+/* XXX: if 27 byte packets desired we can make this smaller */
+/* Global transmit/receive buffer */
+static uint32_t g_ble_phy_tx_buf[(BLE_PHY_MAX_PDU_LEN + 3) / 4];
+static uint32_t g_ble_phy_rx_buf[(BLE_PHY_MAX_PDU_LEN + 3) / 4];
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+/* Make sure word-aligned for faster copies */
+static uint32_t g_ble_phy_enc_buf[(NRF_ENC_BUF_SIZE + 3) / 4];
+#endif
+
+/* RF center frequency for each channel index (offset from 2400 MHz) */
+static const uint8_t g_ble_phy_chan_freq[BLE_PHY_NUM_CHANS] = {
+     4,  6,  8, 10, 12, 14, 16, 18, 20, 22, /* 0-9 */
+    24, 28, 30, 32, 34, 36, 38, 40, 42, 44, /* 10-19 */
+    46, 48, 50, 52, 54, 56, 58, 60, 62, 64, /* 20-29 */
+    66, 68, 70, 72, 74, 76, 78,  2, 26, 80, /* 30-39 */
+};
+
+/* Statistics */
+STATS_SECT_START(ble_phy_stats)
+    STATS_SECT_ENTRY(phy_isrs)
+    STATS_SECT_ENTRY(tx_good)
+    STATS_SECT_ENTRY(tx_fail)
+    STATS_SECT_ENTRY(tx_late)
+    STATS_SECT_ENTRY(tx_bytes)
+    STATS_SECT_ENTRY(rx_starts)
+    STATS_SECT_ENTRY(rx_aborts)
+    STATS_SECT_ENTRY(rx_valid)
+    STATS_SECT_ENTRY(rx_crc_err)
+    STATS_SECT_ENTRY(rx_late)
+    STATS_SECT_ENTRY(radio_state_errs)
+    STATS_SECT_ENTRY(rx_hw_err)
+    STATS_SECT_ENTRY(tx_hw_err)
+STATS_SECT_END
+STATS_SECT_DECL(ble_phy_stats) ble_phy_stats;
+
+STATS_NAME_START(ble_phy_stats)
+    STATS_NAME(ble_phy_stats, phy_isrs)
+    STATS_NAME(ble_phy_stats, tx_good)
+    STATS_NAME(ble_phy_stats, tx_fail)
+    STATS_NAME(ble_phy_stats, tx_late)
+    STATS_NAME(ble_phy_stats, tx_bytes)
+    STATS_NAME(ble_phy_stats, rx_starts)
+    STATS_NAME(ble_phy_stats, rx_aborts)
+    STATS_NAME(ble_phy_stats, rx_valid)
+    STATS_NAME(ble_phy_stats, rx_crc_err)
+    STATS_NAME(ble_phy_stats, rx_late)
+    STATS_NAME(ble_phy_stats, radio_state_errs)
+    STATS_NAME(ble_phy_stats, rx_hw_err)
+    STATS_NAME(ble_phy_stats, tx_hw_err)
+STATS_NAME_END(ble_phy_stats)
+
+/*
+ * NOTE:
+ * Tested the following to see what would happen:
+ *  -> NVIC has radio irq enabled (interrupt # 1, mask 0x2).
+ *  -> Set up nrf to receive. Clear ADDRESS event register.
+ *  -> Enable ADDRESS interrupt on nrf5 by writing to INTENSET.
+ *  -> Enable RX.
+ *  -> Disable interrupts globally using OS_ENTER_CRITICAL().
+ *  -> Wait until a packet is received and the ADDRESS event occurs.
+ *  -> Call ble_phy_disable().
+ *
+ *  At this point I wanted to see the state of the cortex NVIC. The IRQ
+ *  pending bit was TRUE for the radio interrupt (as expected) as we never
+ *  serviced the radio interrupt (interrupts were disabled).
+ *
+ *  What was unexpected was this: without clearing the pending IRQ in the NVIC,
+ *  when radio interrupts were re-enabled (address event bit in INTENSET set to
+ *  1) and the radio ADDRESS event register read 1 (it was never cleared after
+ *  the first address event), the radio did not enter the ISR! I would have
+ *  expected that if the following were true, an interrupt would occur:
+ *      -> NVIC ISER bit set to TRUE
+ *      -> NVIC ISPR bit reads TRUE, meaning interrupt is pending.
+ *      -> Radio peripheral interrupts are enabled for some event (or events).
+ *      -> Corresponding event register(s) in radio peripheral read 1.
+ *
+ *  Not sure what the end result of all this is. We will clear the pending
+ *  bit in the NVIC just to be sure when we disable the PHY.
+ */
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+/* Per nordic, the number of bytes needed for scratch is 16 + MAX_PKT_SIZE. */
+#define NRF_ENC_SCRATCH_WORDS   (((NRF_MAX_ENCRYPTED_PYLD_LEN + 16) + 3) / 4)
+
+uint32_t g_nrf_encrypt_scratchpad[NRF_ENC_SCRATCH_WORDS];
+
+struct nrf_ccm_data
+{
+    uint8_t key[16];
+    uint64_t pkt_counter;
+    uint8_t dir_bit;
+    uint8_t iv[8];
+} __attribute__((packed));
+
+struct nrf_ccm_data g_nrf_ccm_data;
+#endif
+
+/**
+ * Copies the data from the phy receive buffer into a mbuf chain.
+ *
+ * @param dptr Pointer to receive buffer
+ * @param rxpdu Pointer to already allocated mbuf chain
+ *
+ * NOTE: the packet header already has the total mbuf length in it. The
+ * lengths of the individual mbufs are not set prior to calling.
+ *
+ */
+void
+ble_phy_rxpdu_copy(uint8_t *dptr, struct os_mbuf *rxpdu)
+{
+    uint32_t rem_len;
+    uint32_t copy_len;
+    uint32_t block_len;
+    uint32_t block_rem_len;
+    void *dst;
+    void *src;
+    struct os_mbuf * om;
+
+    /* Better be aligned */
+    assert(((uint32_t)dptr & 3) == 0);
+
+    block_len = rxpdu->om_omp->omp_databuf_len;
+    rem_len = OS_MBUF_PKTHDR(rxpdu)->omp_len;
+    src = dptr;
+
+    /*
+     * Setup for copying from first mbuf which is shorter due to packet header
+     * and extra leading space
+     */
+    copy_len = block_len - rxpdu->om_pkthdr_len - 4;
+    om = rxpdu;
+    dst = om->om_data;
+
+    while (true) {
+        /*
+         * Always copy blocks of length aligned to word size, only last mbuf
+         * will have remaining non-word size bytes appended.
+         */
+        block_rem_len = copy_len;
+        copy_len = min(copy_len, rem_len);
+        copy_len &= ~3;
+
+        dst = om->om_data;
+        om->om_len = copy_len;
+        rem_len -= copy_len;
+        block_rem_len -= copy_len;
+
+        __asm__ volatile (".syntax unified              \n"
+                          "   mov  r4, %[len]           \n"
+                          "   b    2f                   \n"
+                          "1: ldr  r3, [%[src], %[len]] \n"
+                          "   str  r3, [%[dst], %[len]] \n"
+                          "2: subs %[len], #4           \n"
+                          "   bpl  1b                   \n"
+                          "   adds %[src], %[src], r4   \n"
+                          "   adds %[dst], %[dst], r4   \n"
+                          : [dst] "+l" (dst), [src] "+l" (src),
+                            [len] "+l" (copy_len)
+                          :
+                          : "r3", "r4", "memory"
+                         );
+
+        if ((rem_len < 4) && (block_rem_len >= rem_len)) {
+            break;
+        }
+
+        /* Move to next mbuf */
+        om = SLIST_NEXT(om, om_next);
+        copy_len = block_len;
+    }
+
+    /* Copy remaining bytes, if any, to last mbuf */
+    om->om_len += rem_len;
+    __asm__ volatile (".syntax unified              \n"
+                      "   b    2f                   \n"
+                      "1: ldrb r3, [%[src], %[len]] \n"
+                      "   strb r3, [%[dst], %[len]] \n"
+                      "2: subs %[len], #1           \n"
+                      "   bpl  1b                   \n"
+                      : [len] "+l" (rem_len)
+                      : [dst] "l" (dst), [src] "l" (src)
+                      : "r3", "memory"
+                     );
+
+    /* Copy header */
+    memcpy(BLE_MBUF_HDR_PTR(rxpdu), &g_ble_phy_data.rxhdr,
+           sizeof(struct ble_mbuf_hdr));
+}
+
+/**
+ * Called when we want to wait if the radio is in either the rx or tx
+ * disable states. We want to wait until that state is over before doing
+ * anything to the radio
+ */
+static void
+nrf_wait_disabled(void)
+{
+    uint32_t state;
+
+    /*
+     * RX and TX states have the same values except for 3rd bit (0=RX, 1=TX) so
+     * we use RX symbols only.
+     */
+    state = NRF_RADIO->STATE & 0x07;
+
+    if (state != RADIO_STATE_STATE_Disabled) {
+        /* If PHY is in idle state for whatever reason, disable it now */
+        if (state == RADIO_STATE_STATE_RxIdle) {
+            NRF_RADIO->TASKS_DISABLE = 1;
+            STATS_INC(ble_phy_stats, radio_state_errs);
+        }
+
+        if (state == RADIO_STATE_STATE_RxDisable) {
+            /* This will end within a short time (6 usecs). Just poll */
+            while (NRF_RADIO->STATE == state) {
+                /* If this fails, something is really wrong. Should last
+                 * no more than 6 usecs */
+            }
+        }
+    }
+}
+
+/**
+ *
+ *
+ */
+int
+ble_phy_set_start_time(uint32_t cputime, uint8_t rem_usecs)
+{
+    uint32_t next_cc;
+    uint32_t cur_cc;
+    uint32_t cntr;
+    uint32_t delta;
+
+    /*
+     * XXX: The TXEN time is 140 usecs but there may be additional delays
+     * Need to look at this.
+     */
+
+    /*
+     * With the 32.768 kHz crystal, we may need to adjust the RTC compare
+     * value by 1 tick due to the time it takes for TXEN. The code uses a 5 RTC
+     * tick offset, which is 152.5 usecs. The TXEN time is 140 usecs. This
+     * means that with a remainder of 0, TIMER0 should be set to 12 or 13 (as
+     * TIMER0 counts at 1MHz). A remainder of 19 or more we will need to add
+     * 1 tick. We dont need to add 1 tick per se, but it does give us slightly
+     * more time and thus less of a chance to miss a tick. Another note: we
+     * cant set TIMER0 CC to 0 as the compare wont occur; it must be 1 or more.
+     * This is why we subtract 18 (as opposed to 19) as rem_uses will be >= 1.
+     */
+    if (rem_usecs <= 18) {
+        cputime -= 5;
+        rem_usecs += 12;
+    } else {
+        cputime -= 4;
+        rem_usecs -= 18;
+    }
+
+    /*
+     * Can we set the RTC compare to start TIMER0? We can do it if:
+     *      a) Current compare value is not N+1 or N+2 ticks from current
+     *      counter.
+     *      b) The value we want to set is not at least N+2 from current
+     *      counter.
+     *
+     * NOTE: since the counter can tick 1 while we do these calculations we
+     * need to account for it.
+     */
+    next_cc = cputime & 0xffffff;
+    cur_cc = NRF_RTC0->CC[0];
+    cntr = NRF_RTC0->COUNTER;
+
+    delta = (cur_cc - cntr) & 0xffffff;
+    if ((delta <= 3) && (delta != 0)) {
+        return -1;
+    }
+    delta = (next_cc - cntr) & 0xffffff;
+    if ((delta & 0x800000) || (delta < 3)) {
+        return -1;
+    }
+
+    /* Clear and set TIMER0 to fire off at proper time */
+    NRF_TIMER0->TASKS_CLEAR = 1;
+    NRF_TIMER0->CC[0] = rem_usecs;
+    NRF_TIMER0->EVENTS_COMPARE[0] = 0;
+
+    /* Set RTC compare to start TIMER0 */
+    NRF_RTC0->EVENTS_COMPARE[0] = 0;
+    NRF_RTC0->CC[0] = next_cc;
+    NRF_RTC0->EVTENSET = RTC_EVTENSET_COMPARE0_Msk;
+
+    /* Enable PPI */
+    NRF_PPI->CHENSET = PPI_CHEN_CH31_Msk;
+
+    /* Store the cputime at which we set the RTC */
+    g_ble_phy_data.phy_start_cputime = cputime;
+
+    return 0;
+}
+
+/**
+ * Function is used to set PPI so that we can time out waiting for a reception
+ * to occur. This happens for two reasons: we have sent a packet and we are
+ * waiting for a respons (txrx should be set to ENABLE_TXRX) or we are
+ * starting a connection event and we are a slave and we are waiting for the
+ * master to send us a packet (txrx should be set to ENABLE_RX).
+ *
+ * NOTE: when waiting for a txrx turn-around, wfr_usecs is not used as there
+ * is no additional time to wait; we know when we should receive the address of
+ * the received frame.
+ *
+ * @param txrx Flag denoting if this wfr is a txrx turn-around or not.
+ * @param tx_phy_mode phy mode for last TX (not used on nRF51)
+ * @param wfr_usecs Amount of usecs to wait.
+ */
+void
+ble_phy_wfr_enable(int txrx, uint8_t tx_phy_mode, uint32_t wfr_usecs)
+{
+    uint32_t end_time;
+
+    if (txrx == BLE_PHY_WFR_ENABLE_TXRX) {
+        /*
+         * Timeout occurs an IFS time plus time it takes to receive address
+         * from the transmit end. We add additional time to make sure the
+         * address event comes before the compare. Note that transmit end
+         * is captured in CC[2]. I just made up the 16 usecs I add here.
+         */
+        end_time = NRF_TIMER0->CC[2] + BLE_LL_IFS +
+            ble_phy_mode_pdu_start_off(BLE_PHY_MODE_1M) + 16;
+    } else {
+        /* CC[0] is set to when RXEN occurs. */
+        end_time = NRF_TIMER0->CC[0] + XCVR_RX_START_DELAY_USECS + wfr_usecs +
+            ble_phy_mode_pdu_start_off(BLE_PHY_MODE_1M) + BLE_LL_JITTER_USECS;
+    }
+
+    /* wfr_secs is the time from rxen until timeout */
+    NRF_TIMER0->CC[3] = end_time;
+    NRF_TIMER0->EVENTS_COMPARE[3] = 0;
+
+    /* Enable wait for response PPI */
+    NRF_PPI->CHENSET = (PPI_CHEN_CH4_Msk | PPI_CHEN_CH5_Msk);
+
+    /* Enable the disabled interrupt so we time out on events compare */
+    NRF_RADIO->INTENSET = RADIO_INTENSET_DISABLED_Msk;
+}
+
+/**
+ * Setup transceiver for receive.
+ */
+static void
+ble_phy_rx_xcvr_setup(void)
+{
+    uint8_t *dptr;
+
+    dptr = (uint8_t *)&g_ble_phy_rx_buf[0];
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+    if (g_ble_phy_data.phy_encrypted) {
+        dptr += 3;
+        NRF_RADIO->PACKETPTR = (uint32_t)&g_ble_phy_enc_buf[0];
+        NRF_CCM->INPTR = (uint32_t)&g_ble_phy_enc_buf[0];
+        NRF_CCM->OUTPTR = (uint32_t)dptr;
+        NRF_CCM->SCRATCHPTR = (uint32_t)&g_nrf_encrypt_scratchpad[0];
+        NRF_CCM->MODE = CCM_MODE_MODE_Decryption;
+        NRF_CCM->CNFPTR = (uint32_t)&g_nrf_ccm_data;
+        NRF_CCM->SHORTS = 0;
+        NRF_CCM->EVENTS_ERROR = 0;
+        NRF_CCM->EVENTS_ENDCRYPT = 0;
+        NRF_PPI->CHENSET = PPI_CHEN_CH24_Msk | PPI_CHEN_CH25_Msk;
+    } else {
+        NRF_RADIO->PACKETPTR = (uint32_t)dptr;
+    }
+#else
+    NRF_RADIO->PACKETPTR = (uint32_t)dptr;
+#endif
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+    if (g_ble_phy_data.phy_privacy) {
+        dptr += 3;
+        NRF_RADIO->PACKETPTR = (uint32_t)dptr;
+        NRF_RADIO->PCNF0 = (6 << RADIO_PCNF0_LFLEN_Pos) |
+                           (2 << RADIO_PCNF0_S1LEN_Pos) |
+                           (NRF_S0_LEN << RADIO_PCNF0_S0LEN_Pos);
+        NRF_AAR->ENABLE = AAR_ENABLE_ENABLE_Enabled;
+        NRF_AAR->IRKPTR = (uint32_t)&g_nrf_irk_list[0];
+        NRF_AAR->SCRATCHPTR = (uint32_t)&g_ble_phy_data.phy_aar_scratch;
+        NRF_AAR->EVENTS_END = 0;
+        NRF_AAR->EVENTS_RESOLVED = 0;
+        NRF_AAR->EVENTS_NOTRESOLVED = 0;
+    } else {
+        if (g_ble_phy_data.phy_encrypted == 0) {
+            NRF_RADIO->PCNF0 = (NRF_LFLEN_BITS << RADIO_PCNF0_LFLEN_Pos) |
+                               (NRF_S0_LEN << RADIO_PCNF0_S0LEN_Pos);
+            /* XXX: do I only need to do this once? Figure out what I can do
+               once. */
+            NRF_AAR->ENABLE = AAR_ENABLE_ENABLE_Disabled;
+        }
+    }
+#endif
+
+    /* Turn off trigger TXEN on output compare match and AAR on bcmatch */
+    NRF_PPI->CHENCLR = PPI_CHEN_CH20_Msk | PPI_CHEN_CH23_Msk;
+
+    /* Reset the rx started flag. Used for the wait for response */
+    g_ble_phy_data.phy_rx_started = 0;
+    g_ble_phy_data.phy_state = BLE_PHY_STATE_RX;
+    g_ble_phy_data.rxdptr = dptr;
+
+    /* I want to know when 1st byte received (after address) */
+    NRF_RADIO->BCC = 8; /* in bits */
+    NRF_RADIO->EVENTS_ADDRESS = 0;
+    NRF_RADIO->EVENTS_DEVMATCH = 0;
+    NRF_RADIO->EVENTS_BCMATCH = 0;
+    NRF_RADIO->EVENTS_RSSIEND = 0;
+    NRF_RADIO->SHORTS = RADIO_SHORTS_END_DISABLE_Msk |
+                        RADIO_SHORTS_READY_START_Msk |
+                        RADIO_SHORTS_DISABLED_TXEN_Msk |
+                        RADIO_SHORTS_ADDRESS_BCSTART_Msk |
+                        RADIO_SHORTS_ADDRESS_RSSISTART_Msk |
+                        RADIO_SHORTS_DISABLED_RSSISTOP_Msk;
+
+    NRF_RADIO->INTENSET = RADIO_INTENSET_ADDRESS_Msk;
+}
+
+/**
+ * Called from interrupt context when the transmit ends
+ *
+ */
+static void
+ble_phy_tx_end_isr(void)
+{
+    uint8_t was_encrypted;
+    uint8_t transition;
+    uint8_t txlen;
+    uint32_t wfr_time;
+
+    /* If this transmission was encrypted we need to remember it */
+    was_encrypted = g_ble_phy_data.phy_encrypted;
+    (void)was_encrypted;
+
+    /* Better be in TX state! */
+    assert(g_ble_phy_data.phy_state == BLE_PHY_STATE_TX);
+
+    /* Clear events and clear interrupt on disabled event */
+    NRF_RADIO->EVENTS_DISABLED = 0;
+    NRF_RADIO->INTENCLR = RADIO_INTENCLR_DISABLED_Msk;
+    NRF_RADIO->EVENTS_END = 0;
+    wfr_time = NRF_RADIO->SHORTS;
+    (void)wfr_time;
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+    /*
+     * XXX: not sure what to do. We had a HW error during transmission.
+     * For now I just count a stat but continue on like all is good.
+     */
+    if (was_encrypted) {
+        if (NRF_CCM->EVENTS_ERROR) {
+            STATS_INC(ble_phy_stats, tx_hw_err);
+            NRF_CCM->EVENTS_ERROR = 0;
+        }
+    }
+#endif
+
+    /* Call transmit end callback */
+    if (g_ble_phy_data.txend_cb) {
+        g_ble_phy_data.txend_cb(g_ble_phy_data.txend_arg);
+    }
+
+    transition = g_ble_phy_data.phy_transition;
+    if (transition == BLE_PHY_TRANSITION_TX_RX) {
+        /* Packet pointer needs to be reset. */
+        ble_phy_rx_xcvr_setup();
+
+        /*
+         * Enable the wait for response timer. Note that cc #1 on
+         * timer 0 contains the transmit start time
+         */
+        txlen = g_ble_phy_data.phy_tx_pyld_len;
+        if (txlen && was_encrypted) {
+            txlen += BLE_LL_DATA_MIC_LEN;
+        }
+        ble_phy_wfr_enable(BLE_PHY_WFR_ENABLE_TXRX, 0, 0);
+    } else {
+        /*
+         * XXX: not sure we need to stop the timer here all the time. Or that
+         * it should be stopped here.
+         */
+        NRF_TIMER0->TASKS_STOP = 1;
+        NRF_TIMER0->TASKS_SHUTDOWN = 1;
+        NRF_PPI->CHENCLR = PPI_CHEN_CH4_Msk | PPI_CHEN_CH5_Msk |
+                           PPI_CHEN_CH20_Msk | PPI_CHEN_CH31_Msk;
+        assert(transition == BLE_PHY_TRANSITION_NONE);
+    }
+}
+
+static void
+ble_phy_rx_end_isr(void)
+{
+    int rc;
+    uint8_t *dptr;
+    uint8_t crcok;
+    struct ble_mbuf_hdr *ble_hdr;
+
+    /* Clear events and clear interrupt */
+    NRF_RADIO->EVENTS_END = 0;
+    NRF_RADIO->INTENCLR = RADIO_INTENCLR_END_Msk;
+
+    /* Disable automatic RXEN */
+    NRF_PPI->CHENCLR = PPI_CHEN_CH21_Msk;
+
+    /* Set RSSI and CRC status flag in header */
+    ble_hdr = &g_ble_phy_data.rxhdr;
+    assert(NRF_RADIO->EVENTS_RSSIEND != 0);
+    ble_hdr->rxinfo.rssi = (-1 * NRF_RADIO->RSSISAMPLE) +
+                            g_ble_phy_data.rx_pwr_compensation;
+
+    dptr = g_ble_phy_data.rxdptr;
+
+    /* Count PHY crc errors and valid packets */
+    crcok = (uint8_t)NRF_RADIO->CRCSTATUS;
+    if (!crcok) {
+        STATS_INC(ble_phy_stats, rx_crc_err);
+    } else {
+        STATS_INC(ble_phy_stats, rx_valid);
+        ble_hdr->rxinfo.flags |= BLE_MBUF_HDR_F_CRC_OK;
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+        if (g_ble_phy_data.phy_encrypted) {
+            /* Only set MIC failure flag if frame is not zero length */
+            if ((dptr[1] != 0) && (NRF_CCM->MICSTATUS == 0)) {
+                ble_hdr->rxinfo.flags |= BLE_MBUF_HDR_F_MIC_FAILURE;
+            }
+
+            /*
+             * XXX: not sure how to deal with this. This should not
+             * be a MIC failure but we should not hand it up. I guess
+             * this is just some form of rx error and that is how we
+             * handle it? For now, just set CRC error flags
+             */
+            if (NRF_CCM->EVENTS_ERROR) {
+                STATS_INC(ble_phy_stats, rx_hw_err);
+                ble_hdr->rxinfo.flags &= ~BLE_MBUF_HDR_F_CRC_OK;
+            }
+
+            /*
+             * XXX: This is a total hack work-around for now but I dont
+             * know what else to do. If ENDCRYPT is not set and we are
+             * encrypted we need to not trust this frame and drop it.
+             */
+            if (NRF_CCM->EVENTS_ENDCRYPT == 0) {
+                STATS_INC(ble_phy_stats, rx_hw_err);
+                ble_hdr->rxinfo.flags &= ~BLE_MBUF_HDR_F_CRC_OK;
+            }
+        }
+#endif
+    }
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION) || MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+    if (g_ble_phy_data.phy_encrypted || g_ble_phy_data.phy_privacy) {
+        /*
+         * XXX: This is a horrible ugly hack to deal with the RAM S1 byte.
+         * This should get fixed as we should not be handing up the header
+         * and length as part of the pdu.
+         */
+        dptr[2] = dptr[1];
+        dptr[1] = dptr[0];
+        ++dptr;
+    }
+#endif
+    rc = ble_ll_rx_end(dptr, ble_hdr);
+    if (rc < 0) {
+        ble_phy_disable();
+    }
+}
+
+static void
+ble_phy_rx_start_isr(void)
+{
+    int rc;
+    uint32_t state;
+    uint32_t usecs;
+    uint32_t ticks;
+    struct ble_mbuf_hdr *ble_hdr;
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+    uint8_t *dptr;
+
+    dptr = (uint8_t *)&g_ble_phy_rx_buf[0];
+#endif
+
+    /* Clear events and clear interrupt */
+    NRF_RADIO->EVENTS_ADDRESS = 0;
+
+    /* Clear wfr timer channels and DISABLED interrupt */
+    NRF_RADIO->INTENCLR = RADIO_INTENCLR_DISABLED_Msk | RADIO_INTENCLR_ADDRESS_Msk;
+    NRF_PPI->CHENCLR = PPI_CHEN_CH4_Msk | PPI_CHEN_CH5_Msk;
+
+    /* Initialize flags, channel and state in ble header at rx start */
+    ble_hdr = &g_ble_phy_data.rxhdr;
+    ble_hdr->rxinfo.flags = ble_ll_state_get();
+    ble_hdr->rxinfo.channel = g_ble_phy_data.phy_chan;
+    ble_hdr->rxinfo.handle = 0;
+    ble_hdr->rxinfo.phy = BLE_PHY_1M;
+    ble_hdr->rxinfo.phy_mode = BLE_PHY_MODE_1M;
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_EXT_ADV)
+    ble_hdr->rxinfo.user_data = NULL;
+#endif
+
+    /*
+     * Calculate receive start time.
+     *
+     * XXX: possibly use other routine with remainder!
+     */
+    usecs = NRF_TIMER0->CC[1] - ble_phy_mode_pdu_start_off(BLE_PHY_MODE_1M);
+    ticks = os_cputime_usecs_to_ticks(usecs);
+    ble_hdr->rem_usecs = usecs - os_cputime_ticks_to_usecs(ticks);
+    if (ble_hdr->rem_usecs == 31) {
+        ble_hdr->rem_usecs = 0;
+        ++ticks;
+    }
+    ble_hdr->beg_cputime = g_ble_phy_data.phy_start_cputime + ticks;
+
+    /* Wait to get 1st byte of frame */
+    while (1) {
+        state = NRF_RADIO->STATE;
+        if (NRF_RADIO->EVENTS_BCMATCH != 0) {
+            break;
+        }
+
+        /*
+         * If state is disabled, we should have the BCMATCH. If not,
+         * something is wrong!
+         */
+        if (state == RADIO_STATE_STATE_Disabled) {
+            NRF_RADIO->INTENCLR = NRF_RADIO_IRQ_MASK_ALL;
+            NRF_RADIO->SHORTS = 0;
+            return;
+        }
+    }
+
+    /* Call Link Layer receive start function */
+    rc = ble_ll_rx_start(g_ble_phy_data.rxdptr, g_ble_phy_data.phy_chan,
+                         &g_ble_phy_data.rxhdr);
+    if (rc >= 0) {
+        /* Set rx started flag and enable rx end ISR */
+        g_ble_phy_data.phy_rx_started = 1;
+        NRF_RADIO->INTENSET = RADIO_INTENSET_END_Msk;
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+        /* Must start aar if we need to  */
+        if (g_ble_phy_data.phy_privacy) {
+            NRF_RADIO->EVENTS_BCMATCH = 0;
+            NRF_PPI->CHENSET = PPI_CHEN_CH23_Msk;
+            /*
+             * Setup AAR to resolve AdvA and trigger it after complete address
+             * is received, i.e. after PDU header and AdvA is received.
+             *
+             * AdvA starts at 4th octet in receive buffer, after S0, len and S1
+             * fields.
+             *
+             * In case of extended advertising AdvA is located after extended
+             * header (+2 octets).
+             */
+            if (BLE_MBUF_HDR_EXT_ADV(&g_ble_phy_data.rxhdr)) {
+                NRF_AAR->ADDRPTR = (uint32_t)(dptr + 5);
+                NRF_RADIO->BCC = (BLE_DEV_ADDR_LEN + BLE_LL_PDU_HDR_LEN + 2) * 8;
+
+            } else {
+                NRF_AAR->ADDRPTR = (uint32_t)(dptr + 3);
+                NRF_RADIO->BCC = (BLE_DEV_ADDR_LEN + BLE_LL_PDU_HDR_LEN) * 8;
+            }
+        }
+#endif
+    } else {
+        /* Disable PHY */
+        ble_phy_disable();
+        STATS_INC(ble_phy_stats, rx_aborts);
+    }
+
+    /* Count rx starts */
+    STATS_INC(ble_phy_stats, rx_starts);
+}
+
+static void
+ble_phy_isr(void)
+{
+    uint32_t irq_en;
+
+    os_trace_isr_enter();
+
+    /* Read irq register to determine which interrupts are enabled */
+    irq_en = NRF_RADIO->INTENCLR;
+
+    /*
+     * NOTE: order of checking is important! Possible, if things get delayed,
+     * we have both an ADDRESS and DISABLED interrupt in rx state. If we get
+     * an address, we disable the DISABLED interrupt.
+     */
+
+    /* We get this if we have started to receive a frame */
+    if ((irq_en & RADIO_INTENCLR_ADDRESS_Msk) && NRF_RADIO->EVENTS_ADDRESS) {
+        irq_en &= ~RADIO_INTENCLR_DISABLED_Msk;
+        ble_phy_rx_start_isr();
+    }
+
+    /* Check for disabled event. This only happens for transmits now */
+    if ((irq_en & RADIO_INTENCLR_DISABLED_Msk) && NRF_RADIO->EVENTS_DISABLED) {
+        if (g_ble_phy_data.phy_state == BLE_PHY_STATE_RX) {
+            NRF_RADIO->EVENTS_DISABLED = 0;
+            ble_ll_wfr_timer_exp(NULL);
+        } else {
+            ble_phy_tx_end_isr();
+        }
+    }
+
+    /* Receive packet end (we dont enable this for transmit) */
+    if ((irq_en & RADIO_INTENCLR_END_Msk) && NRF_RADIO->EVENTS_END) {
+        ble_phy_rx_end_isr();
+    }
+
+    /* Ensures IRQ is cleared */
+    irq_en = NRF_RADIO->SHORTS;
+
+    /* Count # of interrupts */
+    STATS_INC(ble_phy_stats, phy_isrs);
+
+    os_trace_isr_exit();
+}
+
+/**
+ * ble phy init
+ *
+ * Initialize the PHY.
+ *
+ * @return int 0: success; PHY error code otherwise
+ */
+int
+ble_phy_init(void)
+{
+    int rc;
+
+    /* Set phy channel to an invalid channel so first set channel works */
+    g_ble_phy_data.phy_chan = BLE_PHY_NUM_CHANS;
+
+    g_ble_phy_data.rx_pwr_compensation = 0;
+
+    /* Toggle peripheral power to reset (just in case) */
+    NRF_RADIO->POWER = 0;
+    NRF_RADIO->POWER = 1;
+
+    /* Disable all interrupts */
+    NRF_RADIO->INTENCLR = NRF_RADIO_IRQ_MASK_ALL;
+
+    /* Set configuration registers */
+    NRF_RADIO->MODE = RADIO_MODE_MODE_Ble_1Mbit;
+    NRF_RADIO->PCNF0 = (NRF_LFLEN_BITS << RADIO_PCNF0_LFLEN_Pos) |
+                       (NRF_S0_LEN << RADIO_PCNF0_S0LEN_Pos);
+    /* XXX: should maxlen be 251 for encryption? */
+    NRF_RADIO->PCNF1 = NRF_MAXLEN |
+                       (RADIO_PCNF1_ENDIAN_Little <<  RADIO_PCNF1_ENDIAN_Pos) |
+                       (NRF_BALEN << RADIO_PCNF1_BALEN_Pos) |
+                       RADIO_PCNF1_WHITEEN_Msk;
+
+    /* Set base0 with the advertising access address */
+    NRF_RADIO->BASE0 = (BLE_ACCESS_ADDR_ADV << 8) & 0xFFFFFF00;
+    NRF_RADIO->PREFIX0 = (BLE_ACCESS_ADDR_ADV >> 24) & 0xFF;
+
+    /* Configure the CRC registers */
+    NRF_RADIO->CRCCNF = RADIO_CRCCNF_SKIPADDR_Msk | RADIO_CRCCNF_LEN_Three;
+
+    /* Configure BLE poly */
+    NRF_RADIO->CRCPOLY = 0x0100065B;
+
+    /* Configure IFS */
+    NRF_RADIO->TIFS = BLE_LL_IFS;
+
+    /* Captures tx/rx start in timer0 cc 1 and tx/rx end in timer0 cc 2 */
+    NRF_PPI->CHENSET = PPI_CHEN_CH26_Msk | PPI_CHEN_CH27_Msk;
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+    NRF_CCM->INTENCLR = 0xffffffff;
+    NRF_CCM->SHORTS = CCM_SHORTS_ENDKSGEN_CRYPT_Msk;
+    NRF_CCM->EVENTS_ERROR = 0;
+    memset(g_nrf_encrypt_scratchpad, 0, sizeof(g_nrf_encrypt_scratchpad));
+#endif
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+    g_ble_phy_data.phy_aar_scratch = 0;
+    NRF_AAR->IRKPTR = (uint32_t)&g_nrf_irk_list[0];
+    NRF_AAR->INTENCLR = 0xffffffff;
+    NRF_AAR->EVENTS_END = 0;
+    NRF_AAR->EVENTS_RESOLVED = 0;
+    NRF_AAR->EVENTS_NOTRESOLVED = 0;
+    NRF_AAR->NIRK = 0;
+#endif
+
+    /* TIMER0 setup for PHY when using RTC */
+    NRF_TIMER0->TASKS_STOP = 1;
+    NRF_TIMER0->TASKS_SHUTDOWN = 1;
+    NRF_TIMER0->BITMODE = 3;    /* 32-bit timer */
+    NRF_TIMER0->MODE = 0;       /* Timer mode */
+    NRF_TIMER0->PRESCALER = 4;  /* gives us 1 MHz */
+
+    /*
+     * PPI setup.
+     * Channel 4: Captures TIMER0 in CC[3] when EVENTS_ADDRESS occurs. Used
+     *            to cancel the wait for response timer.
+     * Channel 5: TIMER0 CC[3] to TASKS_DISABLE on radio. This is the wait
+     *            for response timer.
+     */
+    NRF_PPI->CH[4].EEP = (uint32_t)&(NRF_RADIO->EVENTS_ADDRESS);
+    NRF_PPI->CH[4].TEP = (uint32_t)&(NRF_TIMER0->TASKS_CAPTURE[3]);
+    NRF_PPI->CH[5].EEP = (uint32_t)&(NRF_TIMER0->EVENTS_COMPARE[3]);
+    NRF_PPI->CH[5].TEP = (uint32_t)&(NRF_RADIO->TASKS_DISABLE);
+
+    /* Set isr in vector table and enable interrupt */
+#ifndef RIOT_VERSION
+    NVIC_SetPriority(RADIO_IRQn, 0);
+#endif
+#if MYNEWT
+    NVIC_SetVector(RADIO_IRQn, (uint32_t)ble_phy_isr);
+#else
+    ble_npl_hw_set_isr(RADIO_IRQn, ble_phy_isr);
+#endif
+    NVIC_EnableIRQ(RADIO_IRQn);
+
+    /* Register phy statistics */
+    if (!g_ble_phy_data.phy_stats_initialized) {
+        rc = stats_init_and_reg(STATS_HDR(ble_phy_stats),
+                                STATS_SIZE_INIT_PARMS(ble_phy_stats,
+                                                      STATS_SIZE_32),
+                                STATS_NAME_INIT_PARMS(ble_phy_stats),
+                                "ble_phy");
+        assert(rc == 0);
+
+        g_ble_phy_data.phy_stats_initialized  = 1;
+    }
+
+    return 0;
+}
+
+/**
+ * Puts the phy into receive mode.
+ *
+ * @return int 0: success; BLE Phy error code otherwise
+ */
+int
+ble_phy_rx(void)
+{
+    /* Check radio state */
+    nrf_wait_disabled();
+    if (NRF_RADIO->STATE != RADIO_STATE_STATE_Disabled) {
+        ble_phy_disable();
+        STATS_INC(ble_phy_stats, radio_state_errs);
+        return BLE_PHY_ERR_RADIO_STATE;
+    }
+
+    /* Make sure all interrupts are disabled */
+    NRF_RADIO->INTENCLR = NRF_RADIO_IRQ_MASK_ALL;
+
+    /* Clear events prior to enabling receive */
+    NRF_RADIO->EVENTS_END = 0;
+    NRF_RADIO->EVENTS_DISABLED = 0;
+
+    /* Setup for rx */
+    ble_phy_rx_xcvr_setup();
+
+    /* Start the receive task in the radio if not automatically going to rx */
+    if ((NRF_PPI->CHEN & PPI_CHEN_CH21_Msk) == 0) {
+        NRF_RADIO->TASKS_RXEN = 1;
+    }
+
+    return 0;
+}
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+/**
+ * Called to enable encryption at the PHY. Note that this state will persist
+ * in the PHY; in other words, if you call this function you have to call
+ * disable so that future PHY transmits/receives will not be encrypted.
+ *
+ * @param pkt_counter
+ * @param iv
+ * @param key
+ * @param is_master
+ */
+void
+ble_phy_encrypt_enable(uint64_t pkt_counter, uint8_t *iv, uint8_t *key,
+                       uint8_t is_master)
+{
+    memcpy(g_nrf_ccm_data.key, key, 16);
+    g_nrf_ccm_data.pkt_counter = pkt_counter;
+    memcpy(g_nrf_ccm_data.iv, iv, 8);
+    g_nrf_ccm_data.dir_bit = is_master;
+    g_ble_phy_data.phy_encrypted = 1;
+
+    /* Encryption uses LFLEN=5, S1LEN = 3. */
+    NRF_RADIO->PCNF0 = (5 << RADIO_PCNF0_LFLEN_Pos) |
+                       (3 << RADIO_PCNF0_S1LEN_Pos) |
+                       (NRF_S0_LEN << RADIO_PCNF0_S0LEN_Pos);
+
+    /* Enable the module (AAR cannot be on while CCM on) */
+    NRF_AAR->ENABLE = AAR_ENABLE_ENABLE_Disabled;
+    NRF_CCM->ENABLE = CCM_ENABLE_ENABLE_Enabled;
+}
+
+void
+ble_phy_encrypt_set_pkt_cntr(uint64_t pkt_counter, int dir)
+{
+    g_nrf_ccm_data.pkt_counter = pkt_counter;
+    g_nrf_ccm_data.dir_bit = dir;
+}
+
+void
+ble_phy_encrypt_disable(void)
+{
+    NRF_PPI->CHENCLR = (PPI_CHEN_CH24_Msk | PPI_CHEN_CH25_Msk);
+    NRF_CCM->TASKS_STOP = 1;
+    NRF_CCM->EVENTS_ERROR = 0;
+    NRF_CCM->ENABLE = CCM_ENABLE_ENABLE_Disabled;
+
+    /* Switch back to normal length */
+    NRF_RADIO->PCNF0 = (NRF_LFLEN_BITS << RADIO_PCNF0_LFLEN_Pos) |
+                       (NRF_S0_LEN << RADIO_PCNF0_S0LEN_Pos);
+
+    g_ble_phy_data.phy_encrypted = 0;
+}
+#endif
+
+void
+ble_phy_set_txend_cb(ble_phy_tx_end_func txend_cb, void *arg)
+{
+    /* Set transmit end callback and arg */
+    g_ble_phy_data.txend_cb = txend_cb;
+    g_ble_phy_data.txend_arg = arg;
+}
+
+/**
+ * Called to set the start time of a transmission.
+ *
+ * This function is called to set the start time when we are not going from
+ * rx to tx automatically.
+ *
+ * NOTE: care must be taken when calling this function. The channel should
+ * already be set.
+ *
+ * @param cputime   This is the tick at which the 1st bit of the preamble
+ *                  should be transmitted
+ * @param rem_usecs This is used only when the underlying timing uses a 32.768
+ *                  kHz crystal. It is the # of usecs from the cputime tick
+ *                  at which the first bit of the preamble should be
+ *                  transmitted.
+ * @return int
+ */
+int
+ble_phy_tx_set_start_time(uint32_t cputime, uint8_t rem_usecs)
+{
+    int rc;
+
+    ble_phy_trace_u32x2(BLE_PHY_TRACE_ID_START_TX, cputime, rem_usecs);
+
+    /* XXX: This should not be necessary, but paranoia is good! */
+    /* Clear timer0 compare to RXEN since we are transmitting */
+    NRF_PPI->CHENCLR = PPI_CHEN_CH21_Msk;
+
+    /*
+     * XXX: The TXEN time is 140 usecs but there may be additional delays
+     * Need to look at this.
+     */
+    if (ble_phy_set_start_time(cputime, rem_usecs) != 0) {
+        STATS_INC(ble_phy_stats, tx_late);
+        ble_phy_disable();
+        rc = BLE_PHY_ERR_TX_LATE;
+    } else {
+        /* Enable PPI to automatically start TXEN */
+        NRF_PPI->CHENSET = PPI_CHEN_CH20_Msk;
+        rc = 0;
+    }
+    return rc;
+}
+/**
+ * Called to set the start time of a reception
+ *
+ * This function acts a bit differently than transmit. If we are late getting
+ * here we will still attempt to receive.
+ *
+ * NOTE: care must be taken when calling this function. The channel should
+ * already be set.
+ *
+ * @param cputime
+ *
+ * @return int
+ */
+int
+ble_phy_rx_set_start_time(uint32_t cputime, uint8_t rem_usecs)
+{
+    int rc;
+
+    ble_phy_trace_u32x2(BLE_PHY_TRACE_ID_START_RX, cputime, rem_usecs);
+
+    /* XXX: This should not be necessary, but paranoia is good! */
+    /* Clear timer0 compare to TXEN since we are transmitting */
+    NRF_PPI->CHENCLR = PPI_CHEN_CH20_Msk;
+
+    /*
+     * XXX: The RXEN time is 138 usecs but there may be additional delays
+     * Need to look at this.
+     */
+    if (ble_phy_set_start_time(cputime, rem_usecs) != 0) {
+        STATS_INC(ble_phy_stats, rx_late);
+        NRF_PPI->CHENCLR = PPI_CHEN_CH21_Msk;
+        NRF_RADIO->TASKS_RXEN = 1;
+        rc = BLE_PHY_ERR_RX_LATE;
+    } else {
+        /* Enable PPI to automatically start RXEN */
+        NRF_PPI->CHENSET = PPI_CHEN_CH21_Msk;
+
+        /* Start rx */
+        rc = ble_phy_rx();
+    }
+    return rc;
+}
+
+int
+ble_phy_tx(ble_phy_tx_pducb_t pducb, void *pducb_arg, uint8_t end_trans)
+{
+    int rc;
+    uint8_t *dptr;
+    uint8_t payload_len;
+    uint8_t payload_off;
+    uint8_t hdr_byte;
+    uint32_t state;
+    uint32_t shortcuts;
+
+    /*
+     * This check is to make sure that the radio is not in a state where
+     * it is moving to disabled state. If so, let it get there.
+     */
+    nrf_wait_disabled();
+
+    /*
+     * XXX: Although we may not have to do this here, I clear all the PPI
+     * that should not be used when transmitting. Some of them are only enabled
+     * if encryption and/or privacy is on, but I dont care. Better to be
+     * paranoid, and if you are going to clear one, might as well clear them
+     * all.
+     */
+    NRF_PPI->CHENCLR = PPI_CHEN_CH4_Msk | PPI_CHEN_CH5_Msk | PPI_CHEN_CH23_Msk |
+                       PPI_CHEN_CH25_Msk;
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+    if (g_ble_phy_data.phy_encrypted) {
+        /* RAM representation has S0, LENGTH and S1 fields. (3 bytes) */
+        dptr = (uint8_t *)&g_ble_phy_enc_buf[0];
+        payload_off = 3;
+
+        NRF_CCM->SHORTS = 1;
+        NRF_CCM->INPTR = (uint32_t)&g_ble_phy_enc_buf[0];
+        NRF_CCM->OUTPTR = (uint32_t)&g_ble_phy_tx_buf[0];
+        NRF_CCM->SCRATCHPTR = (uint32_t)&g_nrf_encrypt_scratchpad[0];
+        NRF_CCM->EVENTS_ERROR = 0;
+        NRF_CCM->MODE = CCM_MODE_MODE_Encryption;
+        NRF_CCM->CNFPTR = (uint32_t)&g_nrf_ccm_data;
+        NRF_PPI->CHENSET = PPI_CHEN_CH24_Msk;
+    } else {
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+        /* Reconfigure PCNF0 */
+        NRF_RADIO->PCNF0 = (NRF_LFLEN_BITS << RADIO_PCNF0_LFLEN_Pos) |
+                           (NRF_S0_LEN << RADIO_PCNF0_S0LEN_Pos);
+        NRF_AAR->IRKPTR = (uint32_t)&g_nrf_irk_list[0];
+#endif
+        /* RAM representation has S0 and LENGTH fields (2 bytes) */
+        dptr = (uint8_t *)&g_ble_phy_tx_buf[0];
+        payload_off = 2;
+    }
+#else
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+    /* Reconfigure PCNF0 */
+    NRF_RADIO->PCNF0 = (NRF_LFLEN_BITS << RADIO_PCNF0_LFLEN_Pos) |
+                       (NRF_S0_LEN << RADIO_PCNF0_S0LEN_Pos);
+#endif
+
+    /* RAM representation has S0 and LENGTH fields (2 bytes) */
+    dptr = (uint8_t *)&g_ble_phy_tx_buf[0];
+    payload_off = 2;
+#endif
+
+    NRF_RADIO->PACKETPTR = (uint32_t)&g_ble_phy_tx_buf[0];
+
+    /* Clear the ready, end and disabled events */
+    NRF_RADIO->EVENTS_READY = 0;
+    NRF_RADIO->EVENTS_END = 0;
+    NRF_RADIO->EVENTS_DISABLED = 0;
+
+    /* Enable shortcuts for transmit start/end. */
+    shortcuts = RADIO_SHORTS_END_DISABLE_Msk | RADIO_SHORTS_READY_START_Msk;
+    if (end_trans == BLE_PHY_TRANSITION_TX_RX) {
+        shortcuts |= RADIO_SHORTS_DISABLED_RXEN_Msk;
+    }
+    NRF_RADIO->SHORTS = shortcuts;
+    NRF_RADIO->INTENSET = RADIO_INTENSET_DISABLED_Msk;
+
+    /* Set PDU payload */
+    payload_len = pducb(&dptr[payload_off], pducb_arg, &hdr_byte);
+
+    /* Set PDU header */
+    dptr[0] = hdr_byte;
+    dptr[1] = payload_len;
+    if (payload_off > 2) {
+        dptr[2] = 0;
+    }
+
+    /* Set the PHY transition */
+    g_ble_phy_data.phy_transition = end_trans;
+
+    /* Set transmitted payload length */
+    g_ble_phy_data.phy_tx_pyld_len = payload_len;
+
+    /* If we already started transmitting, abort it! */
+    state = NRF_RADIO->STATE;
+    if (state != RADIO_STATE_STATE_Tx) {
+
+        /* Set phy state to transmitting and count packet statistics */
+        g_ble_phy_data.phy_state = BLE_PHY_STATE_TX;
+        STATS_INC(ble_phy_stats, tx_good);
+        STATS_INCN(ble_phy_stats, tx_bytes, payload_len + BLE_LL_PDU_HDR_LEN);
+        rc = BLE_ERR_SUCCESS;
+    } else {
+        ble_phy_disable();
+        STATS_INC(ble_phy_stats, tx_late);
+        rc = BLE_PHY_ERR_RADIO_STATE;
+    }
+
+    return rc;
+}
+
+/**
+ * ble phy txpwr set
+ *
+ * Set the transmit output power (in dBm).
+ *
+ * NOTE: If the output power specified is within the BLE limits but outside
+ * the chip limits, we "rail" the power level so we dont exceed the min/max
+ * chip values.
+ *
+ * @param dbm Power output in dBm.
+ *
+ * @return int 0: success; anything else is an error
+ */
+int
+ble_phy_txpwr_set(int dbm)
+{
+    /* Check valid range */
+    assert(dbm <= BLE_PHY_MAX_PWR_DBM);
+
+    /* "Rail" power level if outside supported range */
+    if (dbm > NRF_TX_PWR_MAX_DBM) {
+        dbm = NRF_TX_PWR_MAX_DBM;
+    } else {
+        if (dbm < NRF_TX_PWR_MIN_DBM) {
+            dbm = NRF_TX_PWR_MIN_DBM;
+        }
+    }
+
+    NRF_RADIO->TXPOWER = dbm;
+    g_ble_phy_data.phy_txpwr_dbm = dbm;
+
+    return 0;
+}
+
+/**
+ * ble phy txpwr round
+ *
+ * Get the rounded transmit output power (in dBm).
+ *
+ * @param dbm Power output in dBm.
+ *
+ * @return int Rounded power in dBm
+ */
+int ble_phy_txpower_round(int dbm)
+{
+    /* "Rail" power level if outside supported range */
+    if (dbm > NRF_TX_PWR_MAX_DBM) {
+        dbm = NRF_TX_PWR_MAX_DBM;
+    } else {
+        if (dbm < NRF_TX_PWR_MIN_DBM) {
+            dbm = NRF_TX_PWR_MIN_DBM;
+        }
+    }
+
+    return dbm;
+}
+
+/**
+ * ble phy txpwr get
+ *
+ * Get the transmit power.
+ *
+ * @return int  The current PHY transmit power, in dBm
+ */
+int
+ble_phy_txpwr_get(void)
+{
+    return g_ble_phy_data.phy_txpwr_dbm;
+}
+
+void
+ble_phy_set_rx_pwr_compensation(int8_t compensation)
+{
+    g_ble_phy_data.rx_pwr_compensation = compensation;
+}
+
+/**
+ * ble phy setchan
+ *
+ * Sets the logical frequency of the transceiver. The input parameter is the
+ * BLE channel index (0 to 39, inclusive). The NRF frequency register works like
+ * this: logical frequency = 2400 + FREQ (MHz).
+ *
+ * Thus, to get a logical frequency of 2402 MHz, you would program the
+ * FREQUENCY register to 2.
+ *
+ * @param chan This is the Data Channel Index or Advertising Channel index
+ *
+ * @return int 0: success; PHY error code otherwise
+ */
+int
+ble_phy_setchan(uint8_t chan, uint32_t access_addr, uint32_t crcinit)
+{
+    uint32_t prefix;
+
+    assert(chan < BLE_PHY_NUM_CHANS);
+
+    /* Check for valid channel range */
+    if (chan >= BLE_PHY_NUM_CHANS) {
+        return BLE_PHY_ERR_INV_PARAM;
+    }
+
+    /* Get correct frequency */
+    if (chan < BLE_PHY_NUM_DATA_CHANS) {
+        /* Set current access address */
+        g_ble_phy_data.phy_access_address = access_addr;
+
+        /* Configure logical address 1 and crcinit */
+        prefix = NRF_RADIO->PREFIX0;
+        prefix &= 0xffff00ff;
+        prefix |= ((access_addr >> 24) & 0xFF) << 8;
+        NRF_RADIO->BASE1 = (access_addr << 8) & 0xFFFFFF00;
+        NRF_RADIO->PREFIX0 = prefix;
+        NRF_RADIO->TXADDRESS = 1;
+        NRF_RADIO->RXADDRESSES = (1 << 1);
+        NRF_RADIO->CRCINIT = crcinit;
+    } else {
+        /* Logical adddress 0 preconfigured */
+        NRF_RADIO->TXADDRESS = 0;
+        NRF_RADIO->RXADDRESSES = (1 << 0);
+        NRF_RADIO->CRCINIT = BLE_LL_CRCINIT_ADV;
+
+        /* Set current access address */
+        g_ble_phy_data.phy_access_address = BLE_ACCESS_ADDR_ADV;
+    }
+
+    /* Set the frequency and the data whitening initial value */
+    g_ble_phy_data.phy_chan = chan;
+    NRF_RADIO->FREQUENCY = g_ble_phy_chan_freq[chan];
+    NRF_RADIO->DATAWHITEIV = chan;
+
+    return 0;
+}
+
+/**
+ * Stop the timer used to count microseconds when using RTC for cputime
+ */
+static void
+ble_phy_stop_usec_timer(void)
+{
+    NRF_TIMER0->TASKS_STOP = 1;
+    NRF_TIMER0->TASKS_SHUTDOWN = 1;
+    NRF_RTC0->EVTENCLR = RTC_EVTENSET_COMPARE0_Msk;
+}
+
+/**
+ * ble phy disable irq and ppi
+ *
+ * This routine is to be called when reception was stopped due to either a
+ * wait for response timeout or a packet being received and the phy is to be
+ * restarted in receive mode. Generally, the disable routine is called to stop
+ * the phy.
+ */
+static void
+ble_phy_disable_irq_and_ppi(void)
+{
+    NRF_RADIO->INTENCLR = NRF_RADIO_IRQ_MASK_ALL;
+    NRF_RADIO->SHORTS = 0;
+    NRF_RADIO->TASKS_DISABLE = 1;
+    NRF_PPI->CHENCLR = PPI_CHEN_CH4_Msk | PPI_CHEN_CH5_Msk | PPI_CHEN_CH20_Msk |
+          PPI_CHEN_CH21_Msk | PPI_CHEN_CH23_Msk | PPI_CHEN_CH24_Msk |
+          PPI_CHEN_CH25_Msk | PPI_CHEN_CH31_Msk;
+    NVIC_ClearPendingIRQ(RADIO_IRQn);
+    g_ble_phy_data.phy_state = BLE_PHY_STATE_IDLE;
+}
+
+void
+ble_phy_restart_rx(void)
+{
+    ble_phy_stop_usec_timer();
+    ble_phy_disable_irq_and_ppi();
+    ble_phy_rx();
+}
+
+/**
+ * ble phy disable
+ *
+ * Disables the PHY. This should be called when an event is over. It stops
+ * the usec timer (if used), disables interrupts, disables the RADIO, disables
+ * PPI and sets state to idle.
+ */
+void
+ble_phy_disable(void)
+{
+    ble_phy_trace_void(BLE_PHY_TRACE_ID_DISABLE);
+
+    ble_phy_stop_usec_timer();
+    ble_phy_disable_irq_and_ppi();
+}
+
+/* Gets the current access address */
+uint32_t ble_phy_access_addr_get(void)
+{
+    return g_ble_phy_data.phy_access_address;
+}
+
+/**
+ * Return the phy state
+ *
+ * @return int The current PHY state.
+ */
+int
+ble_phy_state_get(void)
+{
+    return g_ble_phy_data.phy_state;
+}
+
+/**
+ * Called to see if a reception has started
+ *
+ * @return int
+ */
+int
+ble_phy_rx_started(void)
+{
+    return g_ble_phy_data.phy_rx_started;
+}
+
+/**
+ * Return the transceiver state
+ *
+ * @return int transceiver state.
+ */
+uint8_t
+ble_phy_xcvr_state_get(void)
+{
+    uint32_t state;
+    state = NRF_RADIO->STATE;
+    return (uint8_t)state;
+}
+
+/**
+ * Called to return the maximum data pdu payload length supported by the
+ * phy. For this chip, if encryption is enabled, the maximum payload is 27
+ * bytes.
+ *
+ * @return uint8_t Maximum data channel PDU payload size supported
+ */
+uint8_t
+ble_phy_max_data_pdu_pyld(void)
+{
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LE_ENCRYPTION)
+    return NRF_MAX_ENCRYPTED_PYLD_LEN;
+#else
+    return BLE_LL_DATA_PDU_MAX_PYLD;
+#endif
+}
+
+#if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)
+void
+ble_phy_resolv_list_enable(void)
+{
+    NRF_AAR->NIRK = (uint32_t)g_nrf_num_irks;
+    g_ble_phy_data.phy_privacy = 1;
+}
+
+void
+ble_phy_resolv_list_disable(void)
+{
+    g_ble_phy_data.phy_privacy = 0;
+}
+#endif
+
+void
+ble_phy_rfclk_enable(void)
+{
+#if MYNEWT
+    nrf51_clock_hfxo_request();
+#else
+    NRF_CLOCK->TASKS_HFCLKSTART = 1;
+#endif
+}
+
+void
+ble_phy_rfclk_disable(void)
+{
+#if MYNEWT
+    nrf51_clock_hfxo_release();
+#else
+    NRF_CLOCK->TASKS_HFCLKSTOP = 1;
+#endif
+}