单片机串口打印printf函数显示内容(固件库开发)

1.hal_usart.c 文件

#include <stdio.h>
#include "hal_usart.h"
#include "stm32F10x.h"//**要根据 使用的是哪个串口 对应修改 串口号   eg：USART1**
void USART_PUTC(char ch)
{/* 等待数据寄存器为空 */while((USART1->SR & 0x40) == 0);/* 写入数据寄存器 */USART1->DR = (uint8_t)ch;
}
//重指向#pragma import(__use_no_semihosting)struct __FILE
{int handle;
};FILE __stdout;void _sys_exit(int x)
{x = x;
}int fputc(int ch, FILE *f)
{if (ch == '\n'){USART_PUTC('\r');}USART_PUTC(ch);return ch;
}static void hal_usart_Config(void);void hal_UsartInit()
{hal_usart_Config();printf("FreeRtos教程学习\n\r");
}static void hal_usart_Config(void)
{ GPIO_InitTypeDef GPIO_InitStructure;USART_InitTypeDef USART_InitStructure; 
//	NVIC_InitTypeDef NVIC_InitStructure;RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA,ENABLE);RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1,ENABLE);/****************GPIO Setting *******************************************/
//  USART1_TX -> PA9 , 		GPIO_InitStructure.GPIO_Pin = DEBUF_TX_PIN;	         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(DEBUG_TX_PORT, &GPIO_InitStructure);		   
//  USART1_RX ->	PA10GPIO_InitStructure.GPIO_Pin = DEBUF_RX_PIN;	        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(DEBUG_RX_PORT, &GPIO_InitStructure);USART_InitStructure.USART_BaudRate = 115200;USART_InitStructure.USART_WordLength = USART_WordLength_8b;USART_InitStructure.USART_StopBits = USART_StopBits_1;USART_InitStructure.USART_Parity = USART_Parity_No;USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;USART_Init(DEBUG_USART_PORT, &USART_InitStructure); // NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//// NVIC_Init(&NVIC_InitStructure);	//// USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//// USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//// USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//// USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);//USART_Cmd(USART1, ENABLE);                    ///
}//
///
void USART1_IRQHandler(void)
{//unsigned char dat;if(USART_GetITStatus(USART1,USART_IT_RXNE) != RESET){							//dat = USART_ReceiveData(USART1);USART_ClearITPendingBit(USART1,USART_IT_RXNE);}
}

2. hal_usar.h 文件

说明：要根据不同单片串口引脚的不同，来改变修改对应引脚

#ifndef _HAL_USART_H
#define _HAL_USART_H#define DEBUG_TX_PORT	GPIOA         //根据使用串口的 RX,TX 引脚的不同来修改头文件即可
#define DEBUF_TX_PIN	GPIO_Pin_9
#define DEBUG_RX_PORT	GPIOA
#define DEBUF_RX_PIN	GPIO_Pin_10
#define DEBUG_USART_PORT	USART1    //根据利用哪个串口来做Debug口  这里就设置为哪个串口void hal_UsartInit(void);#endif

3. 后续使用printf函数时，加入对应头文件，就能显示想要显示的内容

#include <stdio.h>