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@ -8,45 +8,39 @@ using namespace Pinetime::Drivers;
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// TODO use shortcut to automatically send STOP when receive LastTX, for example
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// TODO use DMA/IRQ
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TwiMaster::TwiMaster(const Modules module, const Parameters& params) : module {module}, params {params} {
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TwiMaster::TwiMaster(NRF_TWIM_Type* module, uint32_t frequency, uint8_t pinSda, uint8_t pinScl)
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: module {module}, frequency {frequency}, pinSda {pinSda}, pinScl {pinScl} {
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}
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void TwiMaster::ConfigurePins() const {
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NRF_GPIO->PIN_CNF[pinScl] =
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(GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) |
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(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
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(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
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(GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
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(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
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NRF_GPIO->PIN_CNF[pinSda] =
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(GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) |
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(GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
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(GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
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(GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
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(GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
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}
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void TwiMaster::Init() {
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if(mutex == nullptr)
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if (mutex == nullptr) {
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mutex = xSemaphoreCreateBinary();
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NRF_GPIO->PIN_CNF[params.pinScl] =
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((uint32_t) GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | ((uint32_t) GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
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((uint32_t) GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) | ((uint32_t) GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
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((uint32_t) GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
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NRF_GPIO->PIN_CNF[params.pinSda] =
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((uint32_t) GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | ((uint32_t) GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
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((uint32_t) GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) | ((uint32_t) GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
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((uint32_t) GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
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switch (module) {
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case Modules::TWIM1:
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twiBaseAddress = NRF_TWIM1;
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break;
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default:
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return;
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}
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switch (static_cast<Frequencies>(params.frequency)) {
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case Frequencies::Khz100:
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twiBaseAddress->FREQUENCY = TWIM_FREQUENCY_FREQUENCY_K100;
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break;
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case Frequencies::Khz250:
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twiBaseAddress->FREQUENCY = TWIM_FREQUENCY_FREQUENCY_K250;
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break;
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case Frequencies::Khz400:
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twiBaseAddress->FREQUENCY = TWIM_FREQUENCY_FREQUENCY_K400;
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break;
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}
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ConfigurePins();
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twiBaseAddress->PSEL.SCL = params.pinScl;
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twiBaseAddress->PSEL.SDA = params.pinSda;
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twiBaseAddress = module;
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twiBaseAddress->FREQUENCY = frequency;
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twiBaseAddress->PSEL.SCL = pinScl;
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twiBaseAddress->PSEL.SDA = pinSda;
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twiBaseAddress->EVENTS_LASTRX = 0;
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twiBaseAddress->EVENTS_STOPPED = 0;
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twiBaseAddress->EVENTS_LASTTX = 0;
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@ -57,19 +51,15 @@ void TwiMaster::Init() {
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twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Enabled << TWIM_ENABLE_ENABLE_Pos);
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/* // IRQ
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NVIC_ClearPendingIRQ(_IRQn);
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NVIC_SetPriority(_IRQn, 2);
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NVIC_EnableIRQ(_IRQn);
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*/
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xSemaphoreGive(mutex);
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}
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TwiMaster::ErrorCodes TwiMaster::Read(uint8_t deviceAddress, uint8_t registerAddress, uint8_t* data, size_t size) {
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xSemaphoreTake(mutex, portMAX_DELAY);
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Wakeup();
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auto ret = Write(deviceAddress, ®isterAddress, 1, false);
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ret = Read(deviceAddress, data, size, true);
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Sleep();
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xSemaphoreGive(mutex);
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return ret;
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}
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@ -77,9 +67,11 @@ TwiMaster::ErrorCodes TwiMaster::Read(uint8_t deviceAddress, uint8_t registerAdd
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TwiMaster::ErrorCodes TwiMaster::Write(uint8_t deviceAddress, uint8_t registerAddress, const uint8_t* data, size_t size) {
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ASSERT(size <= maxDataSize);
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xSemaphoreTake(mutex, portMAX_DELAY);
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Wakeup();
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internalBuffer[0] = registerAddress;
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std::memcpy(internalBuffer + 1, data, size);
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auto ret = Write(deviceAddress, internalBuffer, size + 1, true);
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Sleep();
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xSemaphoreGive(mutex);
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return ret;
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}
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@ -170,17 +162,11 @@ TwiMaster::ErrorCodes TwiMaster::Write(uint8_t deviceAddress, const uint8_t* dat
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}
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void TwiMaster::Sleep() {
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while (twiBaseAddress->ENABLE != 0) {
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twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Disabled << TWIM_ENABLE_ENABLE_Pos);
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}
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nrf_gpio_cfg_default(6);
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nrf_gpio_cfg_default(7);
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NRF_LOG_INFO("[TWIMASTER] Sleep");
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twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Disabled << TWIM_ENABLE_ENABLE_Pos);
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}
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void TwiMaster::Wakeup() {
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Init();
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NRF_LOG_INFO("[TWIMASTER] Wakeup");
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twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Enabled << TWIM_ENABLE_ENABLE_Pos);
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}
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/* Sometimes, the TWIM device just freeze and never set the event EVENTS_LASTTX.
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@ -190,20 +176,10 @@ void TwiMaster::Wakeup() {
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* */
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void TwiMaster::FixHwFreezed() {
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NRF_LOG_INFO("I2C device frozen, reinitializing it!");
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// Disable I²C
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uint32_t twi_state = NRF_TWI1->ENABLE;
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twiBaseAddress->ENABLE = TWIM_ENABLE_ENABLE_Disabled << TWI_ENABLE_ENABLE_Pos;
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NRF_GPIO->PIN_CNF[params.pinScl] =
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((uint32_t) GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | ((uint32_t) GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
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((uint32_t) GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) | ((uint32_t) GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
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((uint32_t) GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
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Sleep();
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NRF_GPIO->PIN_CNF[params.pinSda] =
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((uint32_t) GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) | ((uint32_t) GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
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((uint32_t) GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos) | ((uint32_t) GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos) |
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((uint32_t) GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
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// Re-enable I²C
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twiBaseAddress->ENABLE = twi_state;
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}
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}
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