InfiniSim/sim/drivers/TwiMaster.cpp

#include "drivers/TwiMaster.h"
#include <cstring>
#include <hal/nrf_gpio.h>
#include <nrfx_log.h>

using namespace Pinetime::Drivers;

// TODO use shortcut to automatically send STOP when receive LastTX, for example
// TODO use DMA/IRQ

TwiMaster::TwiMaster(NRF_TWIM_Type* module, uint32_t frequency, uint8_t pinSda, uint8_t pinScl)
  : module {module}, frequency {frequency}, pinSda {pinSda}, pinScl {pinScl} {
}

//void TwiMaster::ConfigurePins() const {
//  NRF_GPIO->PIN_CNF[pinScl] =
//    (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) |
//    (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
//    (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
//    (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
//    (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
//
//  NRF_GPIO->PIN_CNF[pinSda] =
//    (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos) |
//    (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos) |
//    (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos) |
//    (GPIO_PIN_CNF_DRIVE_S0D1 << GPIO_PIN_CNF_DRIVE_Pos) |
//    (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);
//}

void TwiMaster::Init() {
//  if (mutex == nullptr) {
//    mutex = xSemaphoreCreateBinary();
//  }
//
//  ConfigurePins();
//
//  twiBaseAddress = module;
//
//  twiBaseAddress->FREQUENCY = frequency;
//
//  twiBaseAddress->PSEL.SCL = pinScl;
//  twiBaseAddress->PSEL.SDA = pinSda;
//  twiBaseAddress->EVENTS_LASTRX = 0;
//  twiBaseAddress->EVENTS_STOPPED = 0;
//  twiBaseAddress->EVENTS_LASTTX = 0;
//  twiBaseAddress->EVENTS_ERROR = 0;
//  twiBaseAddress->EVENTS_RXSTARTED = 0;
//  twiBaseAddress->EVENTS_SUSPENDED = 0;
//  twiBaseAddress->EVENTS_TXSTARTED = 0;
//
//  twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Enabled << TWIM_ENABLE_ENABLE_Pos);
//
//  xSemaphoreGive(mutex);
}

TwiMaster::ErrorCodes TwiMaster::Read(uint8_t deviceAddress, uint8_t registerAddress, uint8_t* data, size_t size) {
//  xSemaphoreTake(mutex, portMAX_DELAY);
//  Wakeup();
//  auto ret = Write(deviceAddress, &registerAddress, 1, false);
//  ret = Read(deviceAddress, data, size, true);
//  Sleep();
//  xSemaphoreGive(mutex);
//  return ret;
  return TwiMaster::ErrorCodes::NoError;
}

TwiMaster::ErrorCodes TwiMaster::Write(uint8_t deviceAddress, uint8_t registerAddress, const uint8_t* data, size_t size) {
//  ASSERT(size <= maxDataSize);
//  xSemaphoreTake(mutex, portMAX_DELAY);
//  Wakeup();
//  internalBuffer[0] = registerAddress;
//  std::memcpy(internalBuffer + 1, data, size);
//  auto ret = Write(deviceAddress, internalBuffer, size + 1, true);
//  Sleep();
//  xSemaphoreGive(mutex);
//  return ret;
  return TwiMaster::ErrorCodes::NoError;
}

//TwiMaster::ErrorCodes TwiMaster::Read(uint8_t deviceAddress, uint8_t* buffer, size_t size, bool stop) {
//  twiBaseAddress->ADDRESS = deviceAddress;
//  twiBaseAddress->TASKS_RESUME = 0x1UL;
//  twiBaseAddress->RXD.PTR = (uint32_t) buffer;
//  twiBaseAddress->RXD.MAXCNT = size;
//
//  twiBaseAddress->TASKS_STARTRX = 1;
//
//  while (!twiBaseAddress->EVENTS_RXSTARTED && !twiBaseAddress->EVENTS_ERROR)
//    ;
//  twiBaseAddress->EVENTS_RXSTARTED = 0x0UL;
//
//  txStartedCycleCount = DWT->CYCCNT;
//  uint32_t currentCycleCount;
//  while (!twiBaseAddress->EVENTS_LASTRX && !twiBaseAddress->EVENTS_ERROR) {
//    currentCycleCount = DWT->CYCCNT;
//    if ((currentCycleCount - txStartedCycleCount) > HwFreezedDelay) {
//      FixHwFreezed();
//      return ErrorCodes::TransactionFailed;
//    }
//  }
//  twiBaseAddress->EVENTS_LASTRX = 0x0UL;
//
//  if (stop || twiBaseAddress->EVENTS_ERROR) {
//    twiBaseAddress->TASKS_STOP = 0x1UL;
//    while (!twiBaseAddress->EVENTS_STOPPED)
//      ;
//    twiBaseAddress->EVENTS_STOPPED = 0x0UL;
//  } else {
//    twiBaseAddress->TASKS_SUSPEND = 0x1UL;
//    while (!twiBaseAddress->EVENTS_SUSPENDED)
//      ;
//    twiBaseAddress->EVENTS_SUSPENDED = 0x0UL;
//  }
//
//  if (twiBaseAddress->EVENTS_ERROR) {
//    twiBaseAddress->EVENTS_ERROR = 0x0UL;
//  }
//  return ErrorCodes::NoError;
//}

//TwiMaster::ErrorCodes TwiMaster::Write(uint8_t deviceAddress, const uint8_t* data, size_t size, bool stop) {
//  twiBaseAddress->ADDRESS = deviceAddress;
//  twiBaseAddress->TASKS_RESUME = 0x1UL;
//  twiBaseAddress->TXD.PTR = (uint32_t) data;
//  twiBaseAddress->TXD.MAXCNT = size;
//
//  twiBaseAddress->TASKS_STARTTX = 1;
//
//  while (!twiBaseAddress->EVENTS_TXSTARTED && !twiBaseAddress->EVENTS_ERROR)
//    ;
//  twiBaseAddress->EVENTS_TXSTARTED = 0x0UL;
//
//  txStartedCycleCount = DWT->CYCCNT;
//  uint32_t currentCycleCount;
//  while (!twiBaseAddress->EVENTS_LASTTX && !twiBaseAddress->EVENTS_ERROR) {
//    currentCycleCount = DWT->CYCCNT;
//    if ((currentCycleCount - txStartedCycleCount) > HwFreezedDelay) {
//      FixHwFreezed();
//      return ErrorCodes::TransactionFailed;
//    }
//  }
//  twiBaseAddress->EVENTS_LASTTX = 0x0UL;
//
//  if (stop || twiBaseAddress->EVENTS_ERROR) {
//    twiBaseAddress->TASKS_STOP = 0x1UL;
//    while (!twiBaseAddress->EVENTS_STOPPED)
//      ;
//    twiBaseAddress->EVENTS_STOPPED = 0x0UL;
//  } else {
//    twiBaseAddress->TASKS_SUSPEND = 0x1UL;
//    while (!twiBaseAddress->EVENTS_SUSPENDED)
//      ;
//    twiBaseAddress->EVENTS_SUSPENDED = 0x0UL;
//  }
//
//  if (twiBaseAddress->EVENTS_ERROR) {
//    twiBaseAddress->EVENTS_ERROR = 0x0UL;
//    uint32_t error = twiBaseAddress->ERRORSRC;
//    twiBaseAddress->ERRORSRC = error;
//  }
//
//  return ErrorCodes::NoError;
//}

void TwiMaster::Sleep() {
//  twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Disabled << TWIM_ENABLE_ENABLE_Pos);
}

void TwiMaster::Wakeup() {
//  twiBaseAddress->ENABLE = (TWIM_ENABLE_ENABLE_Enabled << TWIM_ENABLE_ENABLE_Pos);
}

/* Sometimes, the TWIM device just freeze and never set the event EVENTS_LASTTX.
 * This method disable and re-enable the peripheral so that it works again.
 * This is just a workaround, and it would be better if we could find a way to prevent
 * this issue from happening.
 * */
//void TwiMaster::FixHwFreezed() {
//  NRF_LOG_INFO("I2C device frozen, reinitializing it!");
//
//  uint32_t twi_state = NRF_TWI1->ENABLE;
//
//  Sleep();
//
//  twiBaseAddress->ENABLE = twi_state;
//}