华清作业day47

uart.h

#ifndef __UART__H__
#define __UART__H__


#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_uart.h"

 
void all_set();
void putchar(char a);
char getchar();
void puts(char *s);
void gets(char *s);


#endif

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 GPIOE_OSPEEDR (*(unsigned int *)0x50006008)
#define GPIOF_OSPEEDR (*(unsigned int *)0x50007008)
#define GPIOE_PUPDR (*(unsigned int *)0x5000600C)
#define GPIOF_PUPDR (*(unsigned int *)0x5000700c)
#define GPIOE_ODR (*(unsigned int *)0x50006014)
#define GPIOF_ODR (*(unsigned int *)0x50007014)

void all_led_init();
void led1_on();
void led1_off();
void led2_on();
void led2_off();
void led3_on();
void led3_off();
void delay(int ms);

void feng_init();
void feng_off();
void feng_on();






#endif

led.c

#include "led.h"
#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));
}
void delay(int ms)
{
    int i,j;
    for(i=0;i<ms;i++)
    {
        for(j=0;j<2000;j++)
        {}
    }
}

void feng_init()
{
    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));
}

void feng_on()
{
     GPIOE_ODR |= (0x1<<9);
}
void feng_off()
{
     GPIOE_ODR  &= (~(0x1<<9));
}

uart4.c

#include "uart4.h"
#include "led.h"
void all_set()
{
    //1.使能GPIOB\GPIOG\UART4外设时钟
    RCC->MP_AHB4ENSETR |=(0x1<<1); //AHB4
    RCC->MP_AHB4ENSETR |=(0x1<<6); //AHB4
    RCC->MP_APB1ENSETR |=(0x1<<16); //UART

    //2.设置PB2\PG11用于UART4的管脚复用
    GPIOB->MODER &=(~(0x3<<4));
    GPIOB->MODER |=(0x2<<4);
    GPIOB->AFRL &=(0xf<<8);
    GPIOB->AFRL |=(0x8<<8);

    GPIOG->MODER &=(~(0x3<<22));
    GPIOG->MODER |=(0x2<<22);
    GPIOG->AFRH &=(0xf<<12);
    GPIOG->AFRH |=(0x6<<12);

    //3.0串口禁用 --->在UE为0时,初始化系统设置
    USART4->CR1 &=(~0x1);

    //3.设置数据位宽为8位
    USART4->CR1 &=(~(0x1<<12));
    USART4->CR1 &=(~(0x0<<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);
}

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;

    if(a == 'a')
    {
        led1_on();
        led2_off();
        led3_off();
    }else if(a == 's')
    {
        led1_off();
        led2_on();
        led3_off();
    }else if(a == 'd')
    {
        led1_off();
        led2_off();
        led3_on();
    }else if(a == 'f')
    {
        feng_on();
    }else if(a == 'g')
    {
        feng_off();
    }
     //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;
}

void puts(char *s)
{
    // while(*s)
    // {
    //     putchar(*s);
    //     s++;
    // }
    // putchar('\r');
    // putchar('\n');
}
void gets(char *s)
{
    // while(1)
    // {
    //     *s = getchar();
    //     putchar(*s);
    //     if(*s == '\r') break;
    //     s++;
    // }
    // *s='\0';
    // putchar('\n');
}

man.c

#include "gpio.h"

#include"uart4.h"

#include "led.h"

int main()

{ 

    char a;

    //char buf[128];

    all_set();

    all_led_init();

    feng_init();

    while(1)

    {

        a=getchar();

        putchar(a);

        putchar('\r');

        putchar('\n');

     //  gets(buf);

     //  puts(buf);

    }

    return 0;

}