main.c

#include "uart4.h"int main(){char a;char buf[128];uart4_config();while (1){/* //接收一个字符数据a=getchar();//发送接收的字符+1putchar(a+1);putchar('\r');putchar('\n');     */gets(buf); // 读取字符串//puts(buf); // 输出字符串if(strcmp(buf,"led1_on")==0)led1_on();if(strcmp(buf,"led1_off")==0)led1_off();if(strcmp(buf,"led2_on")==0)led2_on();if(strcmp(buf,"led2_off")==0)led2_off();if(strcmp(buf,"led3_on")==0)led3_on();if(strcmp(buf,"led3_off")==0)led3_off();if(strcmp(buf,"fen_on")==0)fen_on();if(strcmp(buf,"fen_off")==0)fen_off();if(strcmp(buf,"md_on")==0)md_on();if(strcmp(buf,"md_off")==0)md_off();if(strcmp(buf,"fmq_on")==0)fmq_on();if(strcmp(buf,"fmq_off")==0)fmq_off();}}

uart4.c

#include"uart4.h"void uart4_config()
{//1.使能GPIOB\GPIOG\UART4外设时钟RCC->MP_AHB4ENSETR |= (0x1<<1);//gpiobRCC->MP_AHB4ENSETR |= (0x1<<6);//gpiogRCC->MP_APB1ENSETR |= (0x1<<16);//uart4//2.设置PB2\PG11用于UART4的管脚复用//设置PG11GPIOG->moder &= (~(0x3<<22));GPIOG->moder |= (0x2<<22);GPIOG->afrh &= (~(0xf<<12));GPIOG->afrh |= (0x6<<12);//设置PB2GPIOB->moder &= (~(0x3<<4));GPIOB->moder |= (0x2<<4);GPIOB->afrl &= (~(0xF<<8));GPIOB->afrl |= (0x8<<8);//禁用串口USART4->CR1 &= (~0x1);//3.设置数据位宽为8位USART4->CR1 &= (~(0x1<<12));USART4->CR1 &= (~(0x1<<28));//4.设置无奇偶校验位USART4->CR1 &= (~(0x1<<10));//5.设置16倍过采样USART4->CR1 &= (~(0x1<<15));//6.设置1位停止位USART4->CR2 &= (~(0x3<<12));//7.设置不分频USART4->PRESC &= (~0xf);//8.设置波特率为115200USART4->BRR=0X22B;//9.使能发送器USART4->CR1 |= (0x1<<3);//10.使能接收器USART4->CR1 |= (0x1<<2);//11.使能串口USART4->CR1 |= (0x1);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));//风扇GPIOE->moder &=(~(0X3<<18));//设置PE9输出GPIOE->moder |= (0X1<<18);//设置PE9为推挽输出GPIOE->otyper &=(~(0x1<<9));//PE9为低速输出GPIOE->ospeedr &= (~(0x3<18));//设置无上拉下拉GPIOE->pupdr &= (~(0x3<<18));//蜂鸣器GPIOB->moder &=(~(0X3<<12));//设置PB6输出GPIOB->moder |= (0X1<<12);//设置PE9为推挽输出GPIOB->otyper &=(~(0x1<<6));//PE9为低速输出GPIOB->ospeedr &= (~(0x3<12));//设置无上拉下拉GPIOB->pupdr &= (~(0x3<<12));//马达GPIOF->moder &=(~(0X3<<12));//设置PF6输出GPIOF->moder |= (0X1<<12);//设置PE9为推挽输出GPIOF->otyper &=(~(0x1<<6));//PE9为低速输出GPIOF->ospeedr &= (~(0x3<12));//设置无上拉下拉GPIOF->pupdr &= (~(0x3<<12));
}void putchar(char a)
{//1.先判断发送器是否为空，不为空等待while(!(USART4->ISR &(0x1<<7)));//2.向发送寄存器写入数据USART4->TDR=a;//3.等待发送完成while(!(USART4->ISR &(0x1<<6)));
}char getchar()
{char a;//1.判断接收器是否有准备好的数据，没有就等待while(!(USART4->ISR &(0x1<<5)));//2.读取数据a=USART4->RDR;//3.返回return a;
}//发送一个字符串
void puts(char *s)
{while(*s){putchar(*s);s++;}putchar('\r');putchar('\n');
}//接收一个字符串
void gets(char *s)
{while(1){*s=getchar();putchar(*s);//键盘输入的内容在串口上回显if(*s=='\r')break;s++;}*s='\0';putchar('\n');}int strcmp(char *a,char *b)
{while(*a!='\0'){if(*a != *b){return -1;}a++;b++;}return 0;
}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));
}void fen_on()
{GPIOE->odr |= (0x1<<9);
}
void fen_off()
{GPIOE->odr &= (~(0x1<<9));}void md_on()
{GPIOF->odr |= (0x1<<6);
}
void md_off()
{GPIOF->odr &= (~(0x1<<6));
}void fmq_on()
{GPIOB->odr |= (0x1<<6);
}
void fmq_off()
{GPIOF->odr &= (~(0x1<<6));
}

uart4.h

#ifndef __UART4_H__
#define __UART4_H__
#include"stm32mp1xx_rcc.h"
//#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_uart.h"typedef struct{unsigned int moder;unsigned int otyper;unsigned int ospeedr;unsigned int pupdr;unsigned int idr;unsigned int odr;unsigned int bsrr;unsigned int afrh;unsigned int afrl;
}gpio_t;
#define GPIOE ((gpio_t*)0x50006000)
#define GPIOF ((gpio_t*)0x50007000)
#define GPIOG ((gpio_t*)0x50008000)
#define GPIOB ((gpio_t*)0x50003000)
#define RCC_GPIO (*(unsigned int*)0x50000a28)void all_led_init();
void led1_on();
void led1_off();
void led2_on();
void led2_off();
void led3_on();
void led3_off();
void fen_on();
void fen_off();
void md_on();
void md_off();
void fmq_on();
void fmq_off();void uart4_config();
void putchar(char a);
char getchar();
void gets(char *s);
void puts(char *s);
int strcmp(char *a,char *b);
#endif