MIT SPIne测试4

终于成功收到了数据，两个SPI分别产生了独立的数据，且经过多次读取，基本没有丢失问题。不过为了保证可靠性，还是需要设计一下通信协议，做一下基本的校验。

[RT SPI] Open
[RT SPI] Open
/dev/spidev0.0: 0x10 0x0F 0x0E 0x0D 0x0C 0x0B 0x0A 0x09 0x08 0x07 0x06 0x05 0x04 0x03 0x02 0x01
/dev/spidev0.1: 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F

主函数还是很简单，改成了两个spi顺序发送数据，代码如下：

int main()
{
    spi_open(spi_1_fd, name1);
    spi_open(spi_2_fd, name2);

    uint8_t tx[16];
    uint8_t rx_1[16];
    uint8_t rx_2[16];

    for (int i = 0; i < 16; ++i)
    {
        tx[i] = i;
    }

    int rv = transfer(spi_1_fd, tx, rx_1, 16);
    (void)rv;
    auto str = hex2str(rx_1, 16);
    std::cout << name1 << ": "<< str << std::endl;

    rv = transfer(spi_2_fd, tx, rx_2, 16);
    (void)rv;
    auto str = hex2str(rx_2, 16);
    std::cout << name2 << ": "<< str << std::endl;

    spi_close(spi_1_fd);
    spi_close(spi_2_fd);

    return 0;
}

而STM32的代码主要改动在于使用CS触发的中断来读取数据，并且在读取完数据后清空DR寄存器，来避免后续产生问题：

int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_CAN1_Init();
  MX_CAN2_Init();
  MX_SPI1_Init();
  MX_USART2_UART_Init();
  /* USER CODE BEGIN 2 */
  for(int i = 0; i < 16; ++i)
  {
    tx[i] = 16 - i;
  }
  HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
    //HAL_SPI_TransmitReceive(&hspi1, tx, rx, 16, 10000);
    //HAL_UART_Transmit(&huart2, "hello", 6, 10000);
    HAL_Delay(1000);
  }
  /* USER CODE END 3 */
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if(GPIO_Pin == SPI_CS_Pin)
  {
    HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
		HAL_SPI_TransmitReceive(&hspi1, tx, rx, 16, 10000);

    hspi1.Instance->DR = 0x00;
  }
}