led.c

#include "led.h"
void all_led_init()
{RCC_GPIO |= (0X3<<4);//时钟使能GPIOE_MODER &=(~(0X3<<20));//设置PE10输出GPIOE_MODER |= (0X1<<20);//设置PE10为推挽输出GPIOE_OTYPER &=(~(0x1<<10));//PE10为低速输出GPIOE_OSPEEDR &= (~(0x3<<20));//设置无上拉下拉GPIOE_PUPDR &= (~(0x3<<20));//LED2GPIOF_MODER &=(~(0X3<<20));//设置Pf10输出GPIOF_MODER |= (0X1<<20);//设置Pf10为推挽输出GPIOF_OTYPER &=(~(0x1<<10));//Pf10为低速输出GPIOF_OSPEEDR &= (~(0x3<<20));//设置无上拉下拉GPIOF_PUPDR &= (~(0x3<<20));//LED3GPIOE_MODER &=(~(0X3<<16));//设置PE8输出GPIOE_MODER |= (0X1<<16);//设置PE8为推挽输出GPIOE_OTYPER &=(~(0x1<<8));//PE8为低速输出GPIOE_OSPEEDR &= (~(0x3<16));//设置无上拉下拉GPIOE_PUPDR &= (~(0x3<<16));
}
void led1_on()
{GPIOE_ODR |= (0x1<<10);
}void led1_off()
{GPIOE_ODR &= (~(0x1<<10));
}
void led2_on()
{GPIOF_ODR |= (0x1<<10);
}void led2_off()
{GPIOF_ODR &= (~(0x1<<10));
}
void led3_on()
{GPIOE_ODR |= (0x1<<8);
}void led3_off()
{GPIOE_ODR &= (~(0x1<<8));
}

led.h

#ifndef __LED_H_
#define __LED_H_#define RCC_GPIO     (*(unsigned int *)0x50000a28)
#define GPIOE_MODER     (*(unsigned int *)0x50006000)
#define GPIOF_MODER     (*(unsigned int *)0x50007000)
#define GPIOE_OTYPER     (*(unsigned int *)0x50006004)
#define GPIOF_OTYPER     (*(unsigned int *)0x50007004)
#define GPIOF_OSPEEDR     (*(unsigned int *)0x50007008)
#define GPIOE_OSPEEDR     (*(unsigned int *)0x50006008)
#define GPIOF_PUPDR      (*(unsigned int *)0x5000700C)
#define GPIOE_PUPDR     (*(unsigned int *)0x5000600C)
#define GPIOE_ODR     (*(unsigned int *)0x50007014)
#define GPIOF_ODR     (*(unsigned int *)0x50006014)void led1_on();
void led2_on();
void led3_on();
void led1_off();
void led2_off();
void led3_off();void delay(int ms);void all_led_init();
#endif

uart4.h

#ifndef __UART4_H_
#define __UART4_H_
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include"stm32mp1xx_uart.h"
void uart4_config();
void putchar(char a);
char getchar();
int cmp(char  *s1,char *s2);
void puts(char *s);
void gets(char *s);
#endif

#include"uart4.h"#include "led.h"int main(){char st[100];all_led_init();uart4_config();while(1){gets(st);puts(st);if(cmp(st,"open")==0){led1_on();led2_on();led3_on();}if(cmp(st,"close")==0){led1_off();led2_off();led3_off();}}return 0;}

main.c

uart4.c

#include "uart4.h"
void uart4_config()
{//使能GPIOB/GPIOG/UART4外设时钟RCC->MP_AHB4ENSETR |=(0x1<<1);RCC->MP_AHB4ENSETR |=(0x1<<6);RCC->MP_APB1ENSETR |=(0x1<<16);//设置PB2/PG11用于ＵＡＲＴ4为复用功能
GPIOB->MODER &=(~(0X3<<4));
GPIOB->MODER |=(0X2<<4);
GPIOB->AFRL &=(~(0Xf<<8));
//原来没有移动,下面也是
GPIOB->AFRL |=(0x8<<8);//pg１１
GPIOG->MODER  &=(~(0X3<<22));
//这一整块都移动错误
GPIOG->MODER |=(0X2<<22); 
GPIOG->AFRH &=(~(0Xf<<12));
//最后一个写成Ｌ
GPIOG->AFRH |=(0x6<<12);//串口禁用
USART4->CR1 &=(~0x1);
// UART4->CR1 |=(0x1)
//设置数据位宽为８位
USART4->CR1 &=(~(0x1<<12));
USART4->CR1 &=(~(0x1<<28));
//?//设置无奇偶校验位
USART4->CR1 &=(~(0x1<<10));
//设置１６倍过采样
USART4->CR1 &=(~(0x1<<15));
//设置１位停止位
USART4->CR2 &=(~(0x3<<12));
//设置不分频
USART4->PRESC &=(~(0xf));
//设置波特率为1１５２００USART4->BRR =0X22B;
//使能发送器
USART4->CR1 |=(0X1<<3);
//使能接收器
USART4->CR1 |=(0X1<<2); 
//使能串口
USART4->CR1 |=(0X1);}
void putchar(char a )
{//判断是发送器否为空，不为空等待
while(!(USART4->ISR &(0X1<<7))); //向发送寄存器写入数据USART4->TDR=a ;
//等待发送完成while(!(USART4->ISR &(0x1<<6)));
}
char getchar()
{
//判断接收器是否有准好的数据，没有就等待
char a;while(!(USART4->ISR &(0X1<<5)));
//读取数据a=USART4->RDR;//返回return a;
}void gets(char *s)
{while(1){*s=getchar();if(*s=='\r'){break;}s++;}*s='0';}
void puts(char *s)
{while(1){putchar(*s);s++;}putchar('\r');putchar('\n');}
int cmp(char  *s1,char *s2)
{int i = 0;while(((*(s1+i))==(*(s2+i)))){i++;if( (*(s1+i)=='\0')){break;}}int sub = ((*(s1+i))-(*(s2+i)));if(sub>0){return sub;}else if(sub<0){return sub;}else{return 0;			}}