题目：

题目一：通过操作Cortex-A7核，串口输入相应的命令，控制LED灯进行工作--->上传CSDN

1.例如在串口输入led1on,开饭led1灯点亮

2.例如在串口输入led1off,开饭led1灯熄灭

3.例如在串口输入led2on,开饭led2灯点亮

4.例如在串口输入led2off,开饭led2灯熄灭

5.例如在串口输入led3on,开饭led3灯点亮

6.例如在串口输入led3off,开饭led3灯熄灭

题目二：检测中断到来时，让LED灯状态取反，并且在串口工具上打印一句话--->上传CSDN

例如：

当按键1按下之后，让LED1状态取反，并打印“LED1 down”

当按键2按下之后，让LED2状态取反，并打印“LED2 down”

当按键3按下之后，让LED3状态取反，并打印“LED3 down”

火焰传感器/人体红外/光电开关实验要求如上

代码：

代码一：

mix.h

#ifndef __MIX_H__            
#define __MIX_H__            
                             
#include "stm32mp1xx_rcc.h"  
#include "stm32mp1xx_gpio.h" 
#include "stm32mp1xx_uart.h" 
                             
void hal_mix_rcc();          
void hal_mix_gpio();         
void hal_mix_uart();         
void func();                 
                             
#endif                       

min.c

#include "mix.h"

extern void delay_ms(int ms);
void hal_mix_rcc()
{
    RCC->MP_AHB4ENSETR|=(0x1<<1);
    RCC->MP_AHB4ENSETR|=(0x1<<4);
    RCC->MP_AHB4ENSETR|=(0x1<<5);
    RCC->MP_AHB4ENSETR|=(0x1<<6);

    RCC->MP_APB1LPENSETR|=(0x1<<16);
}
void hal_mix_gpio()
{
    GPIOB->MODER&=(~(0x3<<4));
    GPIOB->MODER|=(0x2<<4);
    GPIOG->MODER&=(~(0x3<<22));
    GPIOG->MODER|=(0x2<<22);

    GPIOB->AFRL&=(~(0xf<<8));
    GPIOB->AFRL|=(0x8<<8);
    GPIOG->AFRH&=(~(0xf<<12));
    GPIOG->AFRH|=(0x6<<12);

    GPIOE->MODER&=(~(0x3<<20));
    GPIOE->MODER|=(0x1<<20);
    GPIOF->MODER&=(~(0x3<<20));
    GPIOF->MODER|=(0x1<<20);
    GPIOE->MODER&=(~(0x3<<16));
    GPIOE->MODER|=(0x1<<16);

    GPIOE->OTYPER&=(~(0x1<<10));
    GPIOF->OTYPER&=(~(0x1<<10));
    GPIOE->OTYPER&=(~(0x1<<8));

    GPIOE->OSPEEDR&=(~(0x3<<20));
    GPIOF->OSPEEDR&=(~(0x3<<20));
    GPIOE->OSPEEDR&=(~(0x3<<16));

    GPIOE->PUPDR&=(~(0x3<<20));
    GPIOF->PUPDR&=(~(0x3<<20));
    GPIOE->PUPDR&=(~(0x3<<16));
}
void hal_led_on(int num)
{
    switch(num)
    {
    case 1:
        GPIOE->ODR|=(0x1<<10);
        break;
    case 2:
        GPIOF->ODR|=(0x1<<10);
        break;
    case 3:
        GPIOE->ODR|=(0x1<<8);
        break;
    }
}
void hal_led_off(int num)
{
    switch(num)                   
    {                             
    case 1:                   
        GPIOE->ODR&=(~(0x1<<10));
        break;                
    case 2:                   
        GPIOF->ODR&=(~(0x1<<10));
        break;                
    case 3:                   
        GPIOE->ODR&=(~(0x1<<8)); 
        break;                
    }                            
}
void hal_mix_uart()
{
    delay_ms(20);
    USART4->CR1&=(~(0x1<<0));

    USART4->CR1&=(~(0x1<<28));
    USART4->CR1&=(~(0x1<<12));
    USART4->CR1&=(~(0x1<<15));
    USART4->CR1&=(~(0x1<<10));

    USART4->CR2&=(~(0x3<<12));

    USART4->PRESC&=(~(0xf<<0));

    USART4->BRR=0x22B;

    USART4->CR1|=(0x1<<3);
    USART4->CR1|=(0x1<<2);
    USART4->CR1|=(0x1<<0);
}
void put_char(const char ch)
{
    while(!(USART4->ISR&(0x1<<7)));
    USART4->TDR=ch;
    while(!(USART4->ISR&(0x1<<6)));
}
void put_string(const char *string)
{
    int i=0;
    char ch;
    while(1)
    {
        ch=string[i];
        put_char(ch);
        if(ch=='\0')
        {
            break;
        }
        i++;
    }
}
char get_char()
{
    char ch;
    while(!(USART4->ISR&(0x1<<5)));
    ch=USART4->RDR;    
    return ch;
}
char buffer[20];
char *get_string()
{
    for(int i=0;i<19;i++)
    {
        buffer[i]=get_char();
        put_char(buffer[i]);
        if(buffer[i]=='\r')
        {
            put_char('\n');
            buffer[i]='\0';
            break;
        }
    }
    return buffer;    
}
int my_strcmp(char *a,char *b)
{
    int i=0;
    int j=0;
    while(*(a+i)!='\0'&&*(b+j)!='\0'&&*(a+i)==*(b+j))
    {
        i++;
        j++;
    }
    return *(a+i)-*(b+j);
}
void func()
{
    char temp[20]={0};
    get_string();
    if(my_strcmp(buffer,"led1on")==0)
    {
        hal_led_on(1);
    }
    else if(my_strcmp(buffer,"led1off")==0)
    {
        hal_led_off(1);
    }
    else if(my_strcmp(buffer,"led2on")==0)
    {
        hal_led_on(2);
    }
    else if(my_strcmp(buffer,"led2off")==0)
    {
        hal_led_off(2);
    }
    else if(my_strcmp(buffer,"led3on")==0)
    {
        hal_led_on(3);
    }
    else if(my_strcmp(buffer,"led3off")==0)
    {
        hal_led_off(3);
    }
}

main.c

#include "mix.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
    int i,j;
    for(i = 0; i < ms;i++)
        for (j = 0; j < 1800; j++);
}

int main()
{
    hal_mix_rcc();                     
    hal_mix_gpio();                    
    hal_mix_uart();                    

    printf("abc");
    while(1)
    {
        func();                            
    }
    return 0;
}

代码二：

运行结果：

结果一：

结果二：