c - 将 A71CH 与 I2C 连接

Question

我正在尝试将以下芯片与 STM32F4 接口(interface) https://www.nxp.com/docs/en/supporting-information/AN12207.pdf

我目前正在尝试使用带中断的 hal 顺序传输来传输重复开始，但它根本不起作用，我收到 NAK。

有人可以告诉我如何连接它以及我应该使用哪些 HAL 函数吗？

unsigned int axI2CWriteRead(unsigned char bus_unused_param, unsigned char addr,
                            unsigned char *pTx, unsigned short txLen,
                            unsigned char *pRx, unsigned short *pRxLen)
{
    extern I2C_HandleTypeDef hi2c3;
    bool recv_length = false;
    HAL_StatusTypeDef status;

    *pRxLen = 0;
    memset(pRx, 0, 2);
    uint8_t rxData[255] = {0};

    status = HAL_I2C_Master_Sequential_Transmit_IT(&hi2c3, 0x90, pTx, txLen, I2C_FIRST_FRAME);

    if (status != HAL_OK)
        return I2C_FAILED;

    while (HAL_I2C_GetState(&hi2c3) != HAL_I2C_STATE_READY)
        ;

    readblock = true;
    readblock_length = 0;
    status = HAL_I2C_Master_Sequential_Receive_IT(&hi2c3, 0x90, rxData, 255, I2C_LAST_FRAME);

    if (status != HAL_OK)
        return I2C_FAILED;
    while (HAL_I2C_GetState(&hi2c3) != HAL_I2C_STATE_READY)
        ;
    readblock = false;
    readblock_length = 0;


    *pRxLen = rxData[0] + 1;

    memcpy(pRx, rxData, *pRxLen);

    return I2C_OK;
}

I2C3初始化

static void MX_I2C3_Init(void)
{

  /* USER CODE BEGIN I2C3_Init 0 */

  /* USER CODE END I2C3_Init 0 */

  /* USER CODE BEGIN I2C3_Init 1 */

  /* USER CODE END I2C3_Init 1 */
  hi2c3.Instance = I2C3;
  hi2c3.Init.ClockSpeed = 100000;
  hi2c3.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c3.Init.OwnAddress1 = 0;
  hi2c3.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c3.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c3.Init.OwnAddress2 = 0;
  hi2c3.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c3.Init.NoStretchMode = I2C_NOSTRETCH_ENABLE;
  if (HAL_I2C_Init(&hi2c3) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C3_Init 2 */

  /* USER CODE END I2C3_Init 2 */

}

Answer 1

根据 the datasheet of the chip ，SCI2C通信不是纯I2C，而是基于SMBus ，它源自 I2C。 STM32F4 HAL不支持 SMBus 但 ST 提供 X-CUBE-SMBUS软件包，可用于实现 SCI2C 协议(protocol)。您必须深入研究协议(protocol)细节并创建自己的库，因为该协议(protocol)非常新，我找不到您可以使用的以前的实现。如果你让它工作，我会建议通过将它上传到 GitHub 或类似的共享平台来为开源社区做出贡献。