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;
}