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#include "Cst816s.h"
#include <FreeRTOS.h>
#include <legacy/nrf_drv_gpiote.h>
#include <nrfx_log.h>
#include <task.h>
#include "drivers/PinMap.h"
using namespace Pinetime::Drivers;
/* References :
* This implementation is based on this article :
* https://medium.com/@ly.lee/building-a-rust-driver-for-pinetimes-touch-controller-cbc1a5d5d3e9 Touch panel datasheet (weird chinese
* translation) : https://wiki.pine64.org/images/5/51/CST816S%E6%95%B0%E6%8D%AE%E6%89%8B%E5%86%8CV1.1.en.pdf
*
* TODO : we need a complete datasheet and protocol reference!
* */
Cst816S::Cst816S(TwiMaster& twiMaster, uint8_t twiAddress) : twiMaster {twiMaster}, twiAddress {twiAddress} {
}
bool Cst816S::Init() {
nrf_gpio_cfg_output(PinMap::Cst816sReset);
nrf_gpio_pin_clear(PinMap::Cst816sReset);
vTaskDelay(5);
nrf_gpio_pin_set(PinMap::Cst816sReset);
vTaskDelay(50);
// Wake the touchpanel up
uint8_t dummy;
twiMaster.Read(twiAddress, 0x15, &dummy, 1);
vTaskDelay(5);
twiMaster.Read(twiAddress, 0xa7, &dummy, 1);
vTaskDelay(5);
/*
[2] EnConLR - Continuous operation can slide around
[1] EnConUD - Slide up and down to enable continuous operation
[0] EnDClick - Enable Double-click action
*/
static constexpr uint8_t motionMask = 0b00000101;
twiMaster.Write(twiAddress, 0xEC, &motionMask, 1);
/*
[7] EnTest - Interrupt pin to test, enable automatic periodic issued after a low pulse.
[6] EnTouch - When a touch is detected, a periodic pulsed Low.
[5] EnChange - Upon detecting a touch state changes, pulsed Low.
[4] EnMotion - When the detected gesture is pulsed Low.
[0] OnceWLP - Press gesture only issue a pulse signal is low.
*/
static constexpr uint8_t irqCtl = 0b01110000;
twiMaster.Write(twiAddress, 0xFA, &irqCtl, 1);
// There's mixed information about which register contains which information
if (twiMaster.Read(twiAddress, 0xA7, &chipId, 1) == TwiMaster::ErrorCodes::TransactionFailed) {
chipId = 0xFF;
return false;
}
if (twiMaster.Read(twiAddress, 0xA8, &vendorId, 1) == TwiMaster::ErrorCodes::TransactionFailed) {
vendorId = 0xFF;
return false;
}
if (twiMaster.Read(twiAddress, 0xA9, &fwVersion, 1) == TwiMaster::ErrorCodes::TransactionFailed) {
fwVersion = 0xFF;
return false;
}
return chipId == 0xb4 && vendorId == 0 && fwVersion == 1;
}
Cst816S::TouchInfos Cst816S::GetTouchInfo() {
Cst816S::TouchInfos info;
uint8_t touchData[7];
auto ret = twiMaster.Read(twiAddress, 0, touchData, sizeof(touchData));
if (ret != TwiMaster::ErrorCodes::NoError) {
info.isValid = false;
return info;
}
// This can only be 0 or 1
uint8_t nbTouchPoints = touchData[touchPointNumIndex] & 0x0f;
uint8_t xHigh = touchData[touchXHighIndex] & 0x0f;
uint8_t xLow = touchData[touchXLowIndex];
info.x = (xHigh << 8) | xLow;
uint8_t yHigh = touchData[touchYHighIndex] & 0x0f;
uint8_t yLow = touchData[touchYLowIndex];
info.y = (yHigh << 8) | yLow;
info.touching = (nbTouchPoints > 0);
info.gesture = static_cast<Gestures>(touchData[gestureIndex]);
return info;
}
void Cst816S::Sleep() {
nrf_gpio_pin_clear(PinMap::Cst816sReset);
vTaskDelay(5);
nrf_gpio_pin_set(PinMap::Cst816sReset);
vTaskDelay(50);
static constexpr uint8_t sleepValue = 0x03;
twiMaster.Write(twiAddress, 0xA5, &sleepValue, 1);
NRF_LOG_INFO("[TOUCHPANEL] Sleep");
}
void Cst816S::Wakeup() {
Init();
NRF_LOG_INFO("[TOUCHPANEL] Wakeup");
}
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