[stm32 Hal library] serial port communication

1.cubemx Configure serial port communication

Mode :

1. Asynchronous : asynchronous , The whole process , It won't hinder the sender's work .
2. Synchronous : Sync , Once the synchronization information is sent , The sender has to wait for the answer , To continue the subsequent line
   by .
3. Single Wire : Single bus , Half duplex .
   
   Baud rate and some parity bit settings , The sending and receiving settings are the same ok.

2. Use of serial port code

I usually use printf Function for serial port output
Redirect fputc function

int fputc (int ch , FILE *f){
    
      uint8_t temp[1] = {
    ch};  
      HAL_UART_Transmit(&huart1,temp,1,2);  
      return ch;
    }

3. Write function code

// send data 
HAL_StatusTypeDef HAL_UART_Transmit(UART_HandleTypeDef *huart, uint8_t *pData,
uint16_t Size, uint32_t Timeout);
// receive data 
HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData,
uint16_t Size, uint32_t Timeout);
// Send interrupt 
HAL_StatusTypeDef HAL_UART_Transmit_IT(UART_HandleTypeDef *huart, uint8_t *
pData, uint16_t Size);
// Receive interrupt 
HAL_StatusTypeDef HAL_UART_Receive_IT(UART_HandleTypeDef *huart, uint8_t *pData
, uint16_t Size);
// Use DMA send out 
HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *
pData, uint16_t Size);
// Use DMA receive 
HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *
pData, uint16_t Size);
//DMA Pause 
HAL_StatusTypeDef HAL_UART_DMAPause(UART_HandleTypeDef *huart);
//DMA recovery 
HAL_StatusTypeDef HAL_UART_DMAResume(UART_HandleTypeDef *huart);
//DMA stop it 
HAL_StatusTypeDef HAL_UART_DMAStop(UART_HandleTypeDef *huart);