ARM day7 (串口协议)

实验一

键盘输入一个字符’a’,串口工具显示’b’

uart4.h

#ifndef __UART4_H__
#define __UART4_H__

#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_uart.h"

//初始化UART4
void hal_uart4_init();

//发送一个字符
void hal_put_char(const char str);

//发送一个字符串
void hal_put_string(const char * str);

//接收一个字符
char hal_get_char();

//接收一个字符串
char* hal_get_string();



#endif

uart4.c

#include "uart4.h"


//初始化UART4
void hal_uart4_init()
{
	/*************RCC*************/
	//1.GPIOB使能 MP_AHB4ENSETR[1] = 1
	RCC->MP_AHB4ENSETR |= (0x1 MP_AHB4ENSETR |= (0x1 MP_APB1ENSETR |= (0x1 MODER &= (~(0X3 MODER |= (0x2 AFRL &= (~(0xf AFRL |= (0x8 MODER &= (~(0X3 MODER |= (0X2 AFRL &= (~(0XF AFRL |= (0X6 CR1 &= (~0x1); 
	
	//1.设置1位起始位，8位数据位
	USART4->CR1 &= (~(0x1 CR1 &= (~(0x1 CR1 &= (~(0x1 CR2 &= (~(0x3 CR1 &= (~(0x1 PRESC &= (~0xF);
	
	//6.设置串口波特率为115200
	USART4->BRR &= (~0xFFFF);
	USART4->BRR |= (0x22B);

	//7.设置串口发送器使能
	USART4->CR1 |= (0x1 CR1 |= (0x1 CR1 |= 0x1;

}



//发送一个字符
void hal_put_char(const char str)
{
	//1.判断是否为空 ISR[7]
	//0为满（堵塞），1为空（发送）
	while(!(USART4->ISR & (0x1 TDR = str;
	//3.判断一帧数据是否发送完成ISR[6]
	//0未完成，1已完成
	while(!(USART4->ISR & (0x1 ISR & (0x1 RDR;


}

main.c

#include "uart4.h"

extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
	int i,j;
	for(i = 0; i 

 

 

实现二

键盘输入一个字符串，串口工具回显输入的字符串

uart4.h

#ifndef __UART4_H__
#define __UART4_H__

#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_uart.h"

//初始化UART4
void hal_uart4_init();



//发送一个字符
void hal_put_char(const char str);

//发送一个字符串
void hal_put_string(const char * str);

//接收一个字符
char hal_get_char();

//接收一个字符串
char* hal_get_string();



#endif

uart4.c

#include "uart4.h"


//初始化UART4
void hal_uart4_init()
{
	/*************RCC*************/
	//1.GPIOB使能 MP_AHB4ENSETR[1] = 1
	RCC->MP_AHB4ENSETR |= (0x1 MP_AHB4ENSETR |= (0x1 MP_APB1ENSETR |= (0x1 MODER &= (~(0X3 MODER |= (0x2 AFRL &= (~(0xf AFRL |= (0x8 MODER &= (~(0X3 MODER |= (0X2 AFRL &= (~(0XF AFRL |= (0X6 CR1 &= (~0x1); 
	
	//1.设置1位起始位，8位数据位
	USART4->CR1 &= (~(0x1 CR1 &= (~(0x1 CR1 &= (~(0x1 CR2 &= (~(0x3 CR1 &= (~(0x1 PRESC &= (~0xF);
	
	//6.设置串口波特率为115200
	USART4->BRR &= (~0xFFFF);
	USART4->BRR |= (0x22B);

	//7.设置串口发送器使能
	USART4->CR1 |= (0x1 CR1 |= (0x1 CR1 |= 0x1;

}



//发送一个字符
void hal_put_char(const char str)
{
	//1.判断是否为空 ISR[7]
	//0为满（堵塞），1为空（发送）
	while(!(USART4->ISR & (0x1 TDR = str;
	//3.判断一帧数据是否发送完成ISR[6]
	//0未完成，1已完成
	while(!(USART4->ISR & (0x1 ISR & (0x1 RDR;


}


//接收一个字符串
char* hal_get_string()
{
	//循环接收
	char* arr='';
	int i=0;
	while(1)
	{
	//'n'回车表示接收完成
	*(arr+i) = hal_get_char();
	hal_put_char(*(arr+i));
	if(*(arr+i) != 'n') break;
	i++;
	}
	return arr;
}

main.c

#include "uart4.h"

extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
	int i,j;
	for(i = 0; i 

 

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