基于STM32 HAL库的I2C 兼容单字节多字节读写例程

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慎微发布时间：2019-7-20 15:47

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int8_t I2C_write(uint8_t addr, uint8_t reg_addr, const uint8_t* data, uint8_t len)  // packet function
{
HAL_StatusTypeDef  status =HAL_OK;
uint16_t deviceWriteAddr = (addr << 1); //7 bit write address shall be pre-processed
status = HAL_I2C_Mem_Write(&hi2c1,deviceWriteAddr,(uint16_t)reg_addr,1,(uint8_t*)data,(uint16_t)len,I2C_READ_TIMEOUT);
if (HAL_OK != status)
{
      printf("I2C Write Fail:%d\n\r",status);
      return status;
}
return HAL_OK;
}

int8_t I2C_read(uint8_t addr, uint8_t reg_addr, const uint8_t* data, uint8_t len)  //re packet function
{
HAL_StatusTypeDef  status =HAL_OK;
uint16_t deviceWriteAddr = addr << 1; //7 bit write address shall be pre-processed
   uint16_t deviceReadAddr = (addr << 1)|0x01; //7 bit read address shall be pre-processed
uint8_t regAddr = reg_addr;

status = HAL_I2C_Master_Transmit(&hi2c1,deviceWriteAddr,&regAddr,1,I2C_READ_TIMEOUT);

if (HAL_OK != status)
{
      printf("I2C readreg Fail:%d\n\r",status);
      return status;
}

status = HAL_I2C_Master_Receive(&hi2c1,deviceReadAddr,(uint8_t*)data,(uint16_t)len,I2C_READ_TIMEOUT); //
if (HAL_OK != status)
{
      printf("I2C Read1 Fail:%d\n\r",status);
      return status;
}
return HAL_OK;
}

写是用HAL_I2C_Mem_Write（) 重新打包；
读操作原本要用HAL_I2C_Mem_Read，发现多字节request时，返回 I2C error.
如上改过后，单字节，多字节读写稳定。
HAL_I2C_Mem_Write/HAL_I2C_Mem_Read 都是cubeMX 工具生成的HAL库。
我是在STM32L4系列使用的。
我参考的I2C 协议参考：http://www.cnblogs.com/aaronLinux/p/6218660.html