diff options
Diffstat (limited to 'src/drivers/SpiMaster.cpp')
-rw-r--r-- | src/drivers/SpiMaster.cpp | 139 |
1 files changed, 112 insertions, 27 deletions
diff --git a/src/drivers/SpiMaster.cpp b/src/drivers/SpiMaster.cpp index 42d3d77b..4a875b9e 100644 --- a/src/drivers/SpiMaster.cpp +++ b/src/drivers/SpiMaster.cpp @@ -1,23 +1,27 @@ #include <hal/nrf_gpio.h> +#include <hal/nrf_spim.h> #include "SpiMaster.h" - +#include <algorithm> using namespace Pinetime::Drivers; SpiMaster::SpiMaster(const SpiMaster::SpiModule spi, const SpiMaster::Parameters ¶ms) : spi{spi}, params{params} { + } bool SpiMaster::Init() { /* Configure GPIO pins used for pselsck, pselmosi, pselmiso and pselss for SPI0 */ + nrf_gpio_pin_set(params.pinSCK); nrf_gpio_cfg_output(params.pinSCK); + nrf_gpio_pin_clear(params.pinMOSI); nrf_gpio_cfg_output(params.pinMOSI); nrf_gpio_cfg_input(params.pinMISO, NRF_GPIO_PIN_NOPULL); nrf_gpio_cfg_output(params.pinCSN); pinCsn = params.pinCSN; switch(spi) { - case SpiModule::SPI0: spiBaseAddress = NRF_SPI0; break; - case SpiModule::SPI1: spiBaseAddress = NRF_SPI1; break; + case SpiModule::SPI0: spiBaseAddress = NRF_SPIM0; break; + case SpiModule::SPI1: spiBaseAddress = NRF_SPIM1; break; default: return false; } @@ -49,51 +53,130 @@ bool SpiMaster::Init() { } spiBaseAddress->CONFIG = regConfig; - spiBaseAddress->EVENTS_READY = 0; - spiBaseAddress->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos); + spiBaseAddress->EVENTS_ENDRX = 0; + spiBaseAddress->EVENTS_ENDTX = 0; + spiBaseAddress->EVENTS_END = 0; + + spiBaseAddress->INTENSET = ((unsigned)1 << (unsigned)6); + spiBaseAddress->INTENSET = ((unsigned)1 << (unsigned)1); + spiBaseAddress->INTENSET = ((unsigned)1 << (unsigned)19); + spiBaseAddress->ENABLE = (SPIM_ENABLE_ENABLE_Enabled << SPIM_ENABLE_ENABLE_Pos); + + NRFX_IRQ_PRIORITY_SET(SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQn,2); + NRFX_IRQ_ENABLE(SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQn); return true; } -bool SpiMaster::Write(const uint8_t *data, size_t size) { - volatile uint32_t dummyread; - if(data == nullptr) return false; +void SpiMaster::SetupWorkaroundForFtpan58(NRF_SPIM_Type *spim, uint32_t ppi_channel, uint32_t gpiote_channel) { + // Create an event when SCK toggles. + NRF_GPIOTE->CONFIG[gpiote_channel] = (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos) | + (spim->PSEL.SCK << GPIOTE_CONFIG_PSEL_Pos) | + (GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos); - /* enable slave (slave select active low) */ - nrf_gpio_pin_clear(pinCsn); + // Stop the spim instance when SCK toggles. + NRF_PPI->CH[ppi_channel].EEP = (uint32_t) &NRF_GPIOTE->EVENTS_IN[gpiote_channel]; + NRF_PPI->CH[ppi_channel].TEP = (uint32_t) &spim->TASKS_STOP; + NRF_PPI->CHENSET = 1U << ppi_channel; - spiBaseAddress->EVENTS_READY = 0; + // Disable IRQ + spim->INTENCLR = (1<<6); + spim->INTENCLR = (1<<1); + spim->INTENCLR = (1<<19); +} - spiBaseAddress->TXD = (uint32_t)*data++; +void SpiMaster::DisableWorkaroundForFtpan58(NRF_SPIM_Type *spim, uint32_t ppi_channel, uint32_t gpiote_channel) { + NRF_GPIOTE->CONFIG[gpiote_channel] = 0; + NRF_PPI->CH[ppi_channel].EEP = 0; + NRF_PPI->CH[ppi_channel].TEP = 0; + NRF_PPI->CHENSET = ppi_channel; + spim->INTENSET = (1<<6); + spim->INTENSET = (1<<1); + spim->INTENSET = (1<<19); +} - while(--size) - { - spiBaseAddress->TXD = (uint32_t)*data++; +void SpiMaster::OnEndEvent(BufferProvider& provider) { + if(!busy) return; + + auto s = currentBufferSize; + if(s > 0) { + auto currentSize = std::min((size_t) 255, s); + PrepareTx(currentBufferAddr, currentSize); + currentBufferAddr += currentSize; + currentBufferSize -= currentSize; + + spiBaseAddress->TASKS_START = 1; + } else { + uint8_t* buffer = nullptr; + size_t size = 0; + if(provider.GetNextBuffer(&buffer, size)) { + currentBufferAddr = (uint32_t) buffer; + currentBufferSize = size; + auto s = currentBufferSize; + auto currentSize = std::min((size_t)255, s); + PrepareTx(currentBufferAddr, currentSize); + currentBufferAddr += currentSize; + currentBufferSize -= currentSize; + + spiBaseAddress->TASKS_START = 1; + } else { + busy = false; + nrf_gpio_pin_set(pinCsn); + } + } +} - /* Wait for the transaction complete or timeout (about 10ms - 20 ms) */ - while (spiBaseAddress->EVENTS_READY == 0); +void SpiMaster::OnStartedEvent(BufferProvider& provider) { + if(!busy) return; +} - /* clear the event to be ready to receive next messages */ - spiBaseAddress->EVENTS_READY = 0; +void SpiMaster::PrepareTx(const volatile uint32_t bufferAddress, const volatile size_t size) { + spiBaseAddress->TXD.PTR = bufferAddress; + spiBaseAddress->TXD.MAXCNT = size; + spiBaseAddress->TXD.LIST = 0; + spiBaseAddress->RXD.PTR = 0; + spiBaseAddress->RXD.MAXCNT = 0; + spiBaseAddress->RXD.LIST = 0; + spiBaseAddress->EVENTS_END = 0; +} + +bool SpiMaster::Write(const uint8_t *data, size_t size) { + if(data == nullptr) return false; - dummyread = spiBaseAddress->RXD; + while(busy) { + asm("nop"); } - /* Wait for the transaction complete or timeout (about 10ms - 20 ms) */ - while (spiBaseAddress->EVENTS_READY == 0); + if(size == 1) { + SetupWorkaroundForFtpan58(spiBaseAddress, 0,0); + } else { + DisableWorkaroundForFtpan58(spiBaseAddress, 0, 0); + } - dummyread = spiBaseAddress->RXD; + nrf_gpio_pin_clear(pinCsn); - /* disable slave (slave select active low) */ - nrf_gpio_pin_set(pinCsn); + currentBufferAddr = (uint32_t)data; + currentBufferSize = size; + busy = true; + + auto currentSize = std::min((size_t)255, (size_t)currentBufferSize); + PrepareTx(currentBufferAddr, currentSize); + currentBufferSize -= currentSize; + currentBufferAddr += currentSize; + spiBaseAddress->TASKS_START = 1; + + if(size == 1) { + while (spiBaseAddress->EVENTS_END == 0); + busy = false; + } return true; } void SpiMaster::Sleep() { - while(NRF_SPI0->ENABLE != 0) { - NRF_SPI0->ENABLE = (SPIM_ENABLE_ENABLE_Disabled << SPIM_ENABLE_ENABLE_Pos); + while(spiBaseAddress->ENABLE != 0) { + spiBaseAddress->ENABLE = (SPIM_ENABLE_ENABLE_Disabled << SPIM_ENABLE_ENABLE_Pos); } nrf_gpio_cfg_default(params.pinSCK); nrf_gpio_cfg_default(params.pinMOSI); @@ -104,3 +187,5 @@ void SpiMaster::Sleep() { void SpiMaster::Wakeup() { Init(); } + + |