led.c
#include "led.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));
}
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 GPIOF_OSPEEDR (*(unsigned int *)0x50007008)
#define GPIOE_OSPEEDR (*(unsigned int *)0x50006008)
#define GPIOF_PUPDR (*(unsigned int *)0x5000700C)
#define GPIOE_PUPDR (*(unsigned int *)0x5000600C)
#define GPIOE_ODR (*(unsigned int *)0x50007014)
#define GPIOF_ODR (*(unsigned int *)0x50006014)
void led1_on();
void led2_on();
void led3_on();
void led1_off();
void led2_off();
void led3_off();
void delay(int ms);
void all_led_init();
#endif
uart4.h
#ifndef __UART4_H_
#define __UART4_H_
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include"stm32mp1xx_uart.h"
void uart4_config();
void putchar(char a);
char getchar();
int cmp(char *s1,char *s2);
void puts(char *s);
void gets(char *s);
#endif
#include"uart4.h"
#include "led.h"
int main()
{
char st[100];
all_led_init();
uart4_config();
while(1)
{
gets(st);
puts(st);
if(cmp(st,"open")==0)
{
led1_on();
led2_on();
led3_on();
}
if(cmp(st,"close")==0)
{
led1_off();
led2_off();
led3_off();
}
}
return 0;
}
main.c
uart4.c
#include "uart4.h"
void uart4_config()
{
//使能GPIOB/GPIOG/UART4外设时钟
RCC->MP_AHB4ENSETR |=(0x1<<1);
RCC->MP_AHB4ENSETR |=(0x1<<6);
RCC->MP_APB1ENSETR |=(0x1<<16);
//设置PB2/PG11用于UART4为复用功能
GPIOB->MODER &=(~(0X3<<4));
GPIOB->MODER |=(0X2<<4);
GPIOB->AFRL &=(~(0Xf<<8));
//原来没有移动,下面也是
GPIOB->AFRL |=(0x8<<8);
//pg11
GPIOG->MODER &=(~(0X3<<22));
//这一整块都移动错误
GPIOG->MODER |=(0X2<<22);
GPIOG->AFRH &=(~(0Xf<<12));
//最后一个写成L
GPIOG->AFRH |=(0x6<<12);
//串口禁用
USART4->CR1 &=(~0x1);
// UART4->CR1 |=(0x1)
//设置数据位宽为8位
USART4->CR1 &=(~(0x1<<12));
USART4->CR1 &=(~(0x1<<28));
//?
//设置无奇偶校验位
USART4->CR1 &=(~(0x1<<10));
//设置16倍过采样
USART4->CR1 &=(~(0x1<<15));
//设置1位停止位
USART4->CR2 &=(~(0x3<<12));
//设置不分频
USART4->PRESC &=(~(0xf));
//设置波特率为115200
USART4->BRR =0X22B;
//使能发送器
USART4->CR1 |=(0X1<<3);
//使能接收器
USART4->CR1 |=(0X1<<2);
//使能串口
USART4->CR1 |=(0X1);
}
void putchar(char a )
{
//判断是发送器否为空,不为空等待
while(!(USART4->ISR &(0X1<<7)));
//向发送寄存器写入数据
USART4->TDR=a ;
//等待发送完成
while(!(USART4->ISR &(0x1<<6)));
}
char getchar()
{
//判断接收器是否有准好的数据,没有就等待
char a;
while(!(USART4->ISR &(0X1<<5)));
//读取数据
a=USART4->RDR;
//返回
return a;
}
void gets(char *s)
{
while(1)
{
*s=getchar();
if(*s=='\r')
{
break;
}
s++;
}
*s='0';
}
void puts(char *s)
{
while(1)
{
putchar(*s);
s++;
}
putchar('\r');
putchar('\n');
}
int cmp(char *s1,char *s2)
{
int i = 0;
while(((*(s1+i))==(*(s2+i))))
{
i++;
if( (*(s1+i)=='\0'))
{
break;
}
}
int sub = ((*(s1+i))-(*(s2+i)));
if(sub>0)
{
return sub;
}
else if(sub<0)
{
return sub;
}
else
{
return 0;
}
}