7-1作业

1.实验目的：完成字符收发

led.h

#ifndef __GPIO_H__ 
#define __GPIO_H__#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_uart.h"//RCC,GPIO,UART初始化
void init();//字符数据发送
void set_tt(const char str);//字符数据接收
char ret_tt();//字符串数据发送
void seting_tt(const char* string);//字符串数据接收
char reting_tt();#endif                                            

led.c

 #include "led.h"//PB2,PG11,UART初始化void init(){//PB2,PG11,UART使能RCC-> MP_AHB4ENSETR |= (0X1<<1);RCC-> MP_AHB4ENSETR |= (0X1<<6);RCC-> MP_APB1ENSETR |= (0X1<<16);//PB2GPIOB->MODER |=(0X3<<4);GPIOB->MODER &=(~(0X1<<4));GPIOB->AFRL |=(0X15<<8);GPIOB->AFRL &=(~(0X7<<8));//PG11GPIOG->MODER |=(0X3<<22);GPIOG->MODER &=(~(0X1<<22));GPIOG->AFRH |=(0X15<<12);GPIOG->AFRH &=(~(0X9<<12));}//发送一个字符void set_tt(const char data){//数据位USART4->CR1 &=(~(0X1<<12));USART4->CR1 &=(~(0X1<<28));USART4->CR1 &=(~(0X1<<10));USART4->CR1 &=(~(0X1<<15));//设置串口波特率USART4->BRR =0X22b;//设置停止位USART4->CR2 &=(~(0X3<<12));//使能USART USART4->CR1 |=(0X1<<0);//设置发送位使能USART4->CR1 |=(0X1<<3);//发送数据if(USART4->ISR &(0X1<<7)){USART4->TDR=data;if(USART4->ISR &(0X1<<6)){return;}}                                                                                                                                            }//接受一个字符char ret_tt(){//数据位USART4->CR1 &=(~(0X1<<12));USART4->CR1 &=(~(0X1<<28));USART4->CR1 &=(~(0X1<<10));USART4->CR1 &=(~(0X1<<15));//设置串口波特率USART4->BRR =0X22b;//设置停止位USART4->CR2 &=(~(0X3<<12));//使能USART USART4->CR1 |=(0X1<<0);//设置接受位使能USART4->CR1 |=(0X1<<2);//接受数据char data;while(1){if(USART4->ISR &(0X1<<5)){data=USART4->RDR;return data;}}return 0;}

main.c

#include "led.h"int main()
{char data;init();while(1){data=ret_tt();set_tt(data);}return 0;
}                             

2.实验目的：完成字符串收发