硬件平臺：master:stm32f401re slave:stm32f401ce

開發(fā)平臺：keil 5.18

操作系統(tǒng)：win7

如上篇所講，將401CE配置為I2C從機，并設置為從發(fā)送模式。

主機的I2C與從機相同，同樣配置即可。同時增加uart設置，方便將接收到的數(shù)據(jù)打印出來。

主機的設置為主接收：

printf("nrStart....nr");

/* 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("nrReceive failedn");

}

}

printf("nr %s nr", aRxBuffer);

/* Infinite loop */

while (1)

{

}

注：這里I2C_ADDRESS為與我們設置的從機地址相同

將兩篇STM的板子I2C連接起來，我們會在串口調試助手里發(fā)現(xiàn)從機發(fā)送過來的數(shù)據(jù),即上篇的”…h(huán)ello world…“。