i2c_master.hpp

[詳解]

#pragma once
 
#include "main.h"
 
#include <cstddef>
#include <cstdint>
#include <mutex>
 
#include "tutrcos/core.hpp"
 
namespace tutrcos {
namespace peripheral {
 
class I2CMaster {
public:
  I2CMaster(I2C_HandleTypeDef *hi2c) : hi2c_{hi2c} {}
 
  bool transmit(uint16_t address, uint8_t *data, size_t size,
                uint32_t timeout) {
    std::lock_guard lock{mtx_};
    if (HAL_I2C_Master_Transmit_IT(hi2c_, address << 1, data, size) != HAL_OK) {
      return false;
    }
    uint32_t start = core::Kernel::get_ticks();
    while (hi2c_->State != HAL_I2C_STATE_READY) {
      uint32_t elapsed = core::Kernel::get_ticks() - start;
      if (elapsed >= timeout) {
        return false;
      }
      core::Thread::delay(1);
    }
    return true;
  }
 
  bool receive(uint16_t address, uint8_t *data, size_t size, uint32_t timeout) {
    std::lock_guard lock{mtx_};
    uint32_t start = core::Kernel::get_ticks();
    if (HAL_I2C_Master_Receive_IT(hi2c_, address << 1, data, size) != HAL_OK) {
      return false;
    }
    while (hi2c_->State != HAL_I2C_STATE_READY) {
      uint32_t elapsed = core::Kernel::get_ticks() - start;
      if (elapsed >= timeout) {
        return false;
      }
      core::Thread::delay(1);
    }
    return true;
  }
 
  I2C_HandleTypeDef *get_hal_handle() { return hi2c_; }
 
private:
  I2C_HandleTypeDef *hi2c_;
  core::Mutex mtx_;
};
 
} // namespace peripheral
} // namespace tutrcos