ARMday6

串口发送控制命令，实现一些外设LED 风扇 马达。。。

uart4.h

#ifndef __UART4_H__
#define __UART4_H__
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_uart.h"
 #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();

 int strcmp(const char *s1, const char *s2);
void uart4_config();
void putchar(char a);
char getchar();
void gets(char *s);
void puts(char *s);
#endif

main.c

#include"uart4.h"

#include"led.h"



int main()

{

    uart4_config();

    all_led_init();

    //char a;

    char buf[128];

    while(1)

    {

        /*//接收一个字符数据

         a=getchar();

         //发送接收的字符+1

         putchar(a+1);  

         putchar('\r'); 

         putchar('\n'); */

        gets(buf); // 读取字符串

        if(strcmp(buf,"led1_on") == 0)

        {

            //LED1亮

            led1_on();

        }

         if(strcmp(buf,"led1_off") == 0)

        {

            //LED1灭

            led1_off();

        }



        if(strcmp(buf,"led2_on") == 0)

        {

            //LED2亮

            led2_on();

        }

         if(strcmp(buf,"led2_off") == 0)

        {

            //LED2灭

            led2_off();

        }



        if(strcmp(buf,"led3_on") == 0)

        {

            //LED3亮

            led3_on();

        }

         if(strcmp(buf,"led3+_off") == 0)

        {

            //LED3灭

            led3_off();

        }

        //puts(buf); // 输出字符串



    }

}

led.c

#include "uart4.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));
 
    //LED2
    GPIOF->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));
 
    //LED3
    GPIOE->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));
    
}

uart4.c

#include"uart4.h"
 
void uart4_config()
{
    //1.使能GPIOB\GPIOG\UART4外设时钟
    RCC->MP_AHB4ENSETR |= 0X42;
    RCC->MP_APB1ENSETR |= 0X1<<16;
    //2.设置PB2\PG11用于UART4的管脚复用
    //设置PG11
    GPIOG->MODER &= (~(0x3<<22));
    GPIOG->MODER |= (0x2<<22);
    GPIOG->AFRH &= (~(0xf<<12));
    GPIOG->AFRH |= (0x6<<12);
    //设置PB2
    GPIOB->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115200
    USART4->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;
}
 
//字符串比较
int strcmp(const char *s1, const char *s2)
{
    for(int i=0; s1[i]!='\0' || s2[i] !='\0'; i++)
    {
            if(s1[i]>s2[i])
            {
                return 1;
            }

            if(s1[i]<s2[i])
            {
                return -1;
            }
    }
    return 0;
}

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')
        {
            *s='\0';
            break;
        }
        s++;
    }
    putchar('\n');
 
}