STM32L0系列之【串口收发】

2万 · 2023-6-16 15:14

1.串口1 USART1初始化 [注意使能接收中断]

/**
* @brief USART1 Initialization Function
* @param None
* @retval None
*/
UART_HandleTypeDef huart1;
void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
//使能接收中断
HAL_UART_Receive_IT(&huart1,usart1_RxBuf_temp,1); // Enable the USART1 Interrupt
}

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2.串口接收中断

/**
* @brief This function handles USART1 global interrupt / USART1 wake-up interrupt through EXTI line 25.
*/
void USART1_IRQHandler(void)
{
HAL_UART_IRQHandler(&huart1);
}

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3.串口接收中断完成回调函数

/**
* @brief Rx Transfer completed callback
* @param UartHandle: UART handle
* @NOTE This example shows a simple way to report end of IT Rx transfer, and
* you can add your own implementation.
* @retval None
*/
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
if(UartHandle->Instance == USART1)
{
Netctrlp_Receive(usart1_RxBuf_temp[0]);
HAL_UART_Receive_IT(&huart1,usart1_RxBuf_temp,1); // 重新使能串口1接收中断
}
}

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4.重定向输入输出，将输出重定向至printf

uint8_t ch;
uint8_t ch_r;
//重写这个函数,重定向printf函数到串口，意思就是说printf直接输出到串口，其默认输出到控制台的
/*fputc*/
int fputc(int c, FILE * f)
{
ch=c;
// HAL_UART_Transmit_IT(&huart1,&ch,1);//发送串口
HAL_UART_Transmit(&huart1,&ch,1,100);//发送串口
return ch;
}
//重定向scanf函数到串口意思就是说接受串口发过来的数据，其默认是接受控制台的数据
/*fgetc*/
int fgetc(FILE * F)
{
HAL_UART_Receive_IT(&huart1,&ch_r,1);//接收
return ch_r;
}

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2万 · 2023-6-16 15:15

5.main.c 主函数

int main(void) //SLAVE

{

HAL_Init();

/* Configure the system clock */

SystemClock_Config();

MX_USART1_UART_Init();

      while(1){

   DBG_print(DBG_DEBUG, " A.");

   HAL_Delay(100);

}

}