Serial port sending code explanation

Create new bsp_usart.c and bsp_usart.h, add them to the project, and add the folder where the header files are located by the magic wand.

#include "bsp_usart.h"

static void NVIC_Configuration(void)
{
   NVIC_InitTypeDef NVIC_InitStructure;

   /* Nested vectored interrupt controller group selection*/
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

   /* Configure USART as interrupt source*/
   NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
   /* Steal priority*/
   NVIC_InitStructure .NVIC_IRQChannelPreemptionPriority = 1;
   /* Subpriority*/
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
   /* Enable interrupts*/
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   /* Initialize configuration NVIC */
   NVIC_Init(&NVIC_InitStructure);
}

void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

    // Turn on the serial port GPIO clock
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

     // Turn on the serial port peripheral clock
     RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

    // Configure USART Tx's GPIO as push-pull multiplexing mode
     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
     GPIO_Init(GPIOA, &GPIO_InitStructure);

// Configure the GPIO of USART Rx as floating input mode
     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOA, &GPIO_InitStructure);

     // Configure the working parameters of the serial port
     // Configure the baud rate
     USART_InitStructure.USART_BaudRate = 115200 ;
     // Configure pin data word length
     USART_InitStructure.USART_WordLength = USART_WordLength_8b;
     // Configure stop bit
     USART_InitStructure.USART_StopBits = USART_StopBits_1;
     // Configure parity bit
     USART_InitStructure.USART_Parity = USART_Parity_No ;
     // Configure hardware flow control
     USART_InitStructure.USART_HardwareFlowControl =
     USART_HardwareFlowControl / Configure the working mode, send and receive together
     USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
     // Complete the serial port initialization configuration
     USART_Init(USART1, &USART_InitStructure);

     // Serial port interrupt priority configuration
     NVIC_Configuration();

     // Enable serial port receive interrupt
     USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

     / / Enable serial port
     USART_Cmd(USART1, ENABLE);
}

/* Send a byte 8 bits*/
/*STM32 USART can only send 8 bits at a time*/
void Usart_SendByte(USART_TypeDef* pUSARTx, uint8_t data)
{
USART_SendData(pUSARTx, data);
while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET );
}

/* Send two bytes of data* 16 bits*/
/*Send twice*/
void Usart_SendHalfWord(USART_TypeDef* pUSARTx, uint16_t data)
{
     uint8_t temp_h,temp_l;/*High and low 8 bits*/

     temp_h = (data&0xff00) >> 8 ;
     temp_l = data&0xff;
     /*Send the upper 8 bits first*/
     USART_SendData(pUSARTx, temp_h);
     while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET );
     /*Send the lower 8 bits*/
     USART_SendData(pUSARTx, temp_l);
     while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET );
}

/* Send an array of 8-bit data*/
void Usart_SendArray(USART_TypeDef* pUSARTx, uint8_t *array, uint8_t num)
{
     uint8_t i;
     for( i=0; i<num; i++ )
   {
         Usart_SendByte(pUSARTx, array[i]) ;
     }
     //Sending 8 bits is for reading, TXE, greater than 8 bits to judge TC
     while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TC) == RESET );
}

/* 发送字符串 */
void Usart_SendStr(USART_TypeDef* pUSARTx, uint8_t *str)
{
     uint8_t i=0;
     do
   {
         Usart_SendByte(pUSARTx, *(str+i));
         i++;
     }while(*(str+i) != '\0');
     while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TC) == RESET );
}

///Redirect the c library function printf to the serial port. After redirection, you can use the printf function
int fputc(int ch, FILE *f)
{
         /* Send a byte of data to the serial port */
         USART_SendData(USART1, (uint8_t) ch) ;

         /* wait for sending to complete*/
         while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);

         return (ch);
}

///Redirect the c library function scanf to the serial port, rewrite and use scanf, getchar and other functions
int fgetc(FILE *f)
{
/* Wait for the serial port input data */
while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET );

return (int)USART_ReceiveData(USART1);
}

#ifndef __BSP_USART_H
#define __BSP_USART_H

#include "stm32f10x.h"
#include <stdio.h>

void USART_Config(void);
void Usart_SendByte(USART_TypeDef* pUSARTx, uint8_t data);
void Usart_SendHalfWord(USART_TypeDef* pUSARTx, uint16_t data);
void Usart_SendArray(USART_TypeDef* pUSARTx, uint8_t *array,uint8_t num);
void Usart_SendStr(USART_TypeDef* pUSARTx, uint8_t *str);

#endif

Serial port sending code explanation

Guess you like