STM32F072RB I2C遇到TXIS无法置位的问题

huochaosuma 提问时间：2017-7-29 17:52 /

hi：
大家好，遇到一个I2C的问题，请大家帮分析一下，不胜感激！
系统使用I2C接2片 MPC23017实现GPIO的扩展，使用STM32F072RB 的I2C 2，引脚GPIO都配置了AF ，且I2C初始化也是参考了ST的例子。
发送数据时i2c_expand_gpio_writeBuffer函数里，while(I2C_GetFlagStatus(GPIO_EXT_I2C, I2C_ISR_TXIS) == RESET) 直到超时一直得不到TXIS置位，请大家帮分析下。

uint8_t i2c_expand_gpio_writeBuffer(uint8_t i2c_chip_addr,uint8_t* pBuffer, uint16_t WriteAddr, uint16_t* NumByteToWrite)
{
  uint32_t DataNum = 0;
  uint32_t i2cTimeout = 0;

  /* Configure slave address, nbytes, reload and generate start */
  I2C_TransferHandling(GPIO_EXT_I2C, i2c_chip_addr, 1, I2C_Reload_Mode, I2C_Generate_Start_Write);

  /* Wait until TXIS flag is set */
  i2cTimeout = GPIO_EXT_I2C_LONG_TIMEOUT;
  while(I2C_GetFlagStatus(GPIO_EXT_I2C, I2C_ISR_TXIS) == RESET)
  {
if((i2cTimeout--) == 0) return I2C_ERROR_TIMEOUT;
  }

  /* Send  address */
  I2C_SendData(GPIO_EXT_I2C, (uint8_t)WriteAddr);

  /* Wait until TCR flag is set */
  i2cTimeout = GPIO_EXT_I2C_LONG_TIMEOUT;
  while(I2C_GetFlagStatus(GPIO_EXT_I2C, I2C_ISR_TCR) == RESET)
  {
if((i2cTimeout--) == 0) return I2C_ERROR_TIMEOUT;
  }

  /* Update CR2 : set Slave Address , set write request, generate Start and set end mode */
  I2C_TransferHandling(GPIO_EXT_I2C, i2c_chip_addr, (uint8_t)(*NumByteToWrite), I2C_AutoEnd_Mode, I2C_No_StartStop);

  while (DataNum != (*NumByteToWrite))
  {
/* Wait until TXIS flag is set */
i2cTimeout = GPIO_EXT_I2C_LONG_TIMEOUT;
while(I2C_GetFlagStatus(GPIO_EXT_I2C, I2C_ISR_TXIS) == RESET)
{
   if((i2cTimeout--) == 0) return I2C_ERROR_TIMEOUT;
}

/* Write data to TXDR */
I2C_SendData(GPIO_EXT_I2C, (uint8_t)(pBuffer[DataNum]));

/* Update number of transmitted data */
DataNum++;
  }

  /* Wait until STOPF flag is set */
  i2cTimeout = GPIO_EXT_I2C_LONG_TIMEOUT;
  while(I2C_GetFlagStatus(GPIO_EXT_I2C, I2C_ISR_STOPF) == RESET)
  {
if((i2cTimeout--) == 0) return I2C_ERROR_TIMEOUT;
  }

  /* Clear STOPF flag */
  I2C_ClearFlag(GPIO_EXT_I2C, I2C_ICR_STOPCF);

  i2c_expand_gpio_waitStandbyState(i2c_chip_addr);

  /* If all operations OK, return sEE_OK (0) */
  return OK;
}

赞收藏 1 评论5 发布时间：2017-7-29 17:52

5个回答

huochaosuma 回答时间：2017-7-29 17:55:54

void i2c_expand_gpio_Init(void)
{
  I2C_InitTypeDef  I2C_InitStructure;
  GPIO_InitTypeDef  GPIO_InitStructure;

  /* Configure the I2C clock source. The clock is derived from the HSI */
  RCC_I2CCLKConfig(RCC_I2C1CLK_HSI);

  /* GPIO_EXT_I2C_SCL_GPIO_CLK and GPIO_EXT_I2C_SDA_GPIO_CLK Periph clock enable */
  RCC_AHBPeriphClockCmd(GPIO_EXT_I2C_SCL_GPIO_CLK | GPIO_EXT_I2C_SDA_GPIO_CLK, ENABLE);

  /* GPIO_EXT_I2C Periph clock enable */
  RCC_APB1PeriphClockCmd(GPIO_EXT_I2C_CLK, ENABLE);

  /* Connect PXx to I2C_SCL*/
  GPIO_PinAFConfig(GPIO_EXT_I2C_SCL_GPIO_PORT, GPIO_EXT_I2C_SCL_SOURCE, GPIO_EXT_I2C_SCL_AF);

  /* Connect PXx to I2C_SDA*/
  GPIO_PinAFConfig(GPIO_EXT_I2C_SDA_GPIO_PORT, GPIO_EXT_I2C_SDA_SOURCE, GPIO_EXT_I2C_SDA_AF);

  /* GPIO configuration */
  /* Configure GPIO_EXT_I2C pins: SCL */
  GPIO_InitStructure.GPIO_Pin = GPIO_EXT_I2C_SCL_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIO_EXT_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);

  /* Configure GPIO_EXT_I2C pins: SDA */
  GPIO_InitStructure.GPIO_Pin = GPIO_EXT_I2C_SDA_PIN;
  GPIO_Init(GPIO_EXT_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);

  /* I2C configuration */
  /* GPIO_EXT_I2C configuration */
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
  I2C_InitStructure.I2C_DigitalFilter = 0x00;
  I2C_InitStructure.I2C_OwnAddress1 = 0x00;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_Timing = GPIO_EXT_I2C_TIMING;

  /* Apply GPIO_EXT_I2C configuration after enabling it */
  I2C_Init(GPIO_EXT_I2C, &I2C_InitStructure);

  /* GPIO_EXT_I2C Peripheral Enable */
  I2C_Cmd(GPIO_EXT_I2C, ENABLE);

  /*Init I2C Slave MPC23017, all port is output*/
  mpc23017Init();

}

这是我的I2C初始化，端口和 I2C 2的选择宏定义，已经检查好多遍了，不会有什么问题。

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