12.11

1.q，w，e亮led1，2，3；

? ? a，s，d灭led1，2，3；

main.c

#include "uar1.h"

#include "led.h"

void delay(int ms)

{

  int i,j;

  for(i=0;i<ms;i++)

  {

  for(j=0;j<2000;j++);

  }

}

int main()

{

	//1.串口的初始化

	uart4_init();

  //LED初始化

  all_led_init();

	char a;

	//现象是发送一个a串口工具打印一个b

	while(1)

	{

		//2.从串口读取一个字符

		a=mygetchar();

		//3.将读取到的字符+1发送回去

		myputchar(a);

    

    switch (a)

    {

      case 'q': led1_on();

      break;

      case 'w': led2_on();

      break;

      case 'e': led3_on();

      break;

      case 'a': led1_off();

      break;

      case 's': led2_off();

      break;

      case 'd': led3_off(); 

      break;   

    }

  }

	return 0;

}

led.h

#ifndef __LED_H__
#define __LED_H__
 
typedef struct
{
    unsigned int moder;
    unsigned int otyper;
    unsigned int ospeedr;
    unsigned int pupdr;
    unsigned int idr;
    unsigned int odr;
    unsigned int bsrr;
} gpio_t1;
 
 
#define GPIOE1 ((gpio_t1 *)0X50006000)
#define GPIOF1 ((gpio_t1 *)0X50007000)
#define RCC_MP_AHB4ENSETR (*(unsigned int *)0X50000a28)
void all_led_init();
void led1_on();
void led2_on();
void led3_on();
void led1_off();
void led2_off();
void led3_off();
 
#endif

uar1.h

#ifndef __UART_H__
#define __UART_H__
#include"stm32mp1xx_gpio.h"
#include"stm32mp1xx_rcc.h"
#include"stm32mp1xx_uart.h"
void uart4_init();
void myputchar(char i);
char mygetchar();
#endif

led.c

#include "led.h"
void all_led_init()
{
  // 1.使能外设时钟
  RCC_MP_AHB4ENSETR |= (0x3 << 4);
  // 2.设置PF10 PE10 PE8为输出输出
  GPIOE1->moder &= (~(0x3 << 20));
  GPIOE1->moder |= (0x1 << 20);
  GPIOF1->moder &= (~(0x3 << 20));
  GPIOF1->moder |= (0x1 << 20);
  GPIOE1->moder &= (~(0x3 << 16));
  GPIOE1->moder |= (0x1 << 16);
  // 3.设置推挽输出
  GPIOE1->otyper &= (~(0x1 << 10));
  GPIOF1->otyper &= (~(0x1 << 10));
  GPIOE1->otyper &= (~(0x1 << 8));
  // 4.设置输出速度为低速
  GPIOE1->ospeedr &= (~(0x3 << 20));
  GPIOF1->ospeedr &= (~(0x3 << 20));
  GPIOE1->ospeedr &= (~(0x3 << 16));
  // 5.设置无上拉下拉
  GPIOE1->pupdr &= (~(0x3 << 20));
  GPIOF1->pupdr &= (~(0x3 << 20));
  GPIOE1->pupdr &= (~(0x3 << 16));
}
 
void led1_on()
{
 
  GPIOE1->odr |= (0x1 << 10);
}
void led2_on()
{
 
  GPIOF1->odr |= (0x1 << 10);
}
void led3_on()
{
 
  GPIOE1->odr |= (0x1 << 8);
}
 
void led1_off()
{
  GPIOE1->odr &= (~(0x1 << 10));
}
void led2_off()
{
  GPIOF1->odr &= (~(0x1 << 10));
}
void led3_off()
{
  GPIOE1->odr &= (~(0x1 << 8));
}

uar1.c

#include"uar1.h"

 
//串口数据初始化
void uart4_init()
{
    //设置UART4的RCc时钟使能
    //RCC_MP_APB1ENSETR[16]->1
    RCC->MP_APB1ENSETR |= (0x1<<16);
    //设置GPIOB和GPIOG的时钟使能
    //RCC_MP_AHB4ENSETR[6]->1
    //RCC_MP_AHB4ENSETR[1]->1
    RCC->MP_AHB4ENSETR |= (0x1<<1);
    RCC->MP_AHB4ENSETR |= (0X1<<6);
    //设置PG11和PB2功能复用为UART4功能
    //PG11
    //GPIOG_MODER[23:22]->10
    GPIOG->MODER &= (~(0X3<<22));
    GPIOG->MODER |= (0X2<<22);
    //GPIOG_AFRH[15:12]->0110    
    GPIOG->AFRH &= (~(0xf<<12));
    GPIOG->AFRH |= (0x6<<12);
    //PB2
    //GPIOB_MODER[5:4]->10
    //GPIOB_AFRL[11:8]->1000
    GPIOB->MODER &= (~(0x3<<4));
    GPIOB->MODER |= (0X2<<4);
    GPIOB->AFRL &= (~(0xF<<8));
    GPIOB->AFRL |= (0x8<<8);
    //禁用串口
    USART4->CR1 &=(~0x1);
    //设置数据8个数据位 CR1[28]->0  CR1[12]-》0
    USART4->CR1 &= (~(0X1<<28));
    USART4->CR1 &= (~(0X1<<12));
    //设置没有校验位CR1[10]->0
    USART4->CR1 &= (~(0X1<<10));
    //设置1个停止位CR2[13:12]->00
    USART4->CR2 &= (~(0x3<<12));
    //设置16倍采样 CR1[15]->0
    USART4->CR1 &= (~(0X1<<15));
    //设置波特率为115200 BRR=0X22B
    USART4->BRR |= 0X22B;
    //设置1分频 PRESC[3:0]->0000
    USART4->PRESC &= (~(0XF));
    //使能发送器 CR1[3]->1
    USART4->CR1 |= (0X1<<3);
    //使能接收器 CR1[2]->1
    USART4->CR1 |= (0X1<<2);
    //使能串口 CR1[0]->1
    USART4->CR1 |= (0X1);
}
//封装函数发送一个字符数据
void myputchar(char c)
{
    //判断发送数据寄存器有没有数据，没有数据时可以发送
    while(!(USART4->ISR&(0X1<<7)));
    USART4->TDR=c;//将要发送的数据保存在发送寄存器中
    while(!(USART4->ISR&(0X1<<6)));//数据传输完成，函数结束
}
char mygetchar()
{
    char c;
    //判断是否有数据准备好
    while(!(USART4->ISR&(0X1<<5)));//数据传输完成，函数结束
    c=USART4->RDR;
    return c;
 
}

2.字符串点亮

uar1.c

#include"uar1.h"
#include"led.h"
char buf[51]={0};
//串口数据初始化
void uart4_init()
{
    //设置UART4的RCc时钟使能
    //RCC_MP_APB1ENSETR[16]->1
    RCC->MP_APB1ENSETR |= (0x1<<16);
    //设置GPIOB和GPIOG的时钟使能
    //RCC_MP_AHB4ENSETR[6]->1
    //RCC_MP_AHB4ENSETR[1]->1
    RCC->MP_AHB4ENSETR |= (0x1<<1);
    RCC->MP_AHB4ENSETR |= (0X1<<6);
    //设置PG11和PB2功能复用为UART4功能
    //PG11
    //GPIOG_MODER[23:22]->10
    GPIOG->MODER &= (~(0X3<<22));
    GPIOG->MODER |= (0X2<<22);
    //GPIOG_AFRH[15:12]->0110    
    GPIOG->AFRH &= (~(0xf<<12));
    GPIOG->AFRH |= (0x6<<12);
    //PB2
    //GPIOB_MODER[5:4]->10
    //GPIOB_AFRL[11:8]->1000
    GPIOB->MODER &= (~(0x3<<4));
    GPIOB->MODER |= (0X2<<4);
    GPIOB->AFRL &= (~(0xF<<8));
    GPIOB->AFRL |= (0x8<<8);
    //禁用串口
    USART4->CR1 &=(~0x1);
    //设置数据8个数据位 CR1[28]->0  CR1[12]-》0
    USART4->CR1 &= (~(0X1<<28));
    USART4->CR1 &= (~(0X1<<12));
    //设置没有校验位CR1[10]->0
    USART4->CR1 &= (~(0X1<<10));
    //设置1个停止位CR2[13:12]->00
    USART4->CR2 &= (~(0x3<<12));
    //设置16倍采样 CR1[15]->0
    USART4->CR1 &= (~(0X1<<15));
    //设置波特率为115200 BRR=0X22B
    USART4->BRR |= 0X22B;
    //设置1分频 PRESC[3:0]->0000
    USART4->PRESC &= (~(0XF));
    //使能发送器 CR1[3]->1
    USART4->CR1 |= (0X1<<3);
    //使能接收器 CR1[2]->1
    USART4->CR1 |= (0X1<<2);
    //使能串口 CR1[0]->1
    USART4->CR1 |= (0X1);
}
//封装函数发送一个字符数据
void myputchar(char c)
{
    //判断发送数据寄存器有没有数据，没有数据时可以发送
    while(!(USART4->ISR&(0X1<<7)));
    USART4->TDR=c;//将要发送的数据保存在发送寄存器中
    while(!(USART4->ISR&(0X1<<6)));//数据传输完成，函数结束
}
char mygetchar()
{
    char c;
    //判断是否有数据准备好
    while(!(USART4->ISR&(0X1<<5)));//数据传输完成，函数结束
    c=USART4->RDR;
    return c;

}

//输出一个字符串
void puts(char *s)
{
   while(*s)
   {
    myputchar(*s);
    s++;
   }
   myputchar('\n');//切换到下一行
   myputchar('\r');//切换到一行的开头
}

//读取一个字符串
char *gets()
{
    unsigned int i;
    for(i=0;i<50;i++)
    {
        buf[i]=mygetchar();//接受字符串
        myputchar(buf[i]);//回显
        if(buf[i]=='\r')
        break;
    }
    buf[i]='\0';
    myputchar('\n');//换行
    return buf;
}
//字符串比较
int strcmp(char *str,char *dst)
{
    while(*str)
    {
        if(*str != *dst)
        {
            return 1;
        }   
        str++;
        dst++;          
    }
    return 0;
}
void deal(char*str)
{
    if(strcmp(str,"led1_on")==0)
    {
        led1_on();
    }
    else if(strcmp(str,"led1_off")==0)
    {
        led1_off();
    }
    else if(strcmp(str,"led2_on")==0)
    {
        led2_on();
    }
    else if(strcmp(str,"led2_off")==0)
    {
        led2_off();
    }
    else if(strcmp(str,"led3_on")==0)
    {
        led3_on();
    }
    else if(strcmp(str,"led3_off")==0)
    {
        led3_off();
    }
}

?main.c

#include "uar1.h"

#include "led.h"

void delay(int ms)

{

  int i,j;

  for(i=0;i<ms;i++)

  {

  for(j=0;j<2000;j++);

  }

}

int main()

{

   all_led_init();

    //1.串口的初始化

    uart4_init();



    char a;

    char *str;

    //现象是发送一个a串口工具打印一个b

    while(1)

    {

        myputchar('\n');//切换到下一行

        myputchar('\r');//切换到一行的开头

        //2.从串口读取一个字符

        //a=mygetchar();

        //3.将读取到的字符+1发送回去

        //myputchar(a+1);

        str=gets();

       // puts(str);

       deal(str);

       

    }

    return 0;

}

?