两片STM32之间I2C通信

硬件平台：master:stm32f401re slave:stm32f401ce 

开发平台：keil 5.18 

操作系统：win7

如上篇所讲，将401CE配置为I2C从机，并设置为从发送模式。 

主机的I2C与从机相同，同样配置即可。同时增加uart设置，方便将接收到的数据打印出来。

主机的设置为主接收：

printf("\n\rStart....\n\r");

/* Put I2C peripheral in reception process */ 

/* Timeout is set to 10S */ 

while(HAL_I2C_Master_Receive(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 10000) != HAL_OK)

{

    /* Error_Handler() function is called when Timeout error occurs.When Acknowledge failure occurs (Slave don't acknowledge it's address) Master restarts communication */

    if (HAL_I2C_GetError(&I2cHandle) != HAL_I2C_ERROR_AF)

    {

        printf("\n\rReceive failed\n");

    }   

}

printf("\n\r %s \n\r", aRxBuffer);

/* Infinite loop */  

while (1)

{

}

注：这里I2C_ADDRESS为与我们设置的从机地址相同

将两篇STM的板子I2C连接起来，我们会在串口调试助手里发现从机发送过来的数据,即上篇的”…hello world…“。