ARM12.25-编程知识

ARM12.25

串口发送控制命令，实现一些外设LED 风扇马达运转

下实现灯亮

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();
void puts(char *s);
void gets(char *s);
int strcmp(char *s1,char *s2);#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();#endif

uart4.c

#include "uart4.h"
void uart4_config()
{//1.使能GPIOB\GPIOG\UART4外设时钟RCC->MP_AHB4ENSETR |=(0X1<<1);RCC->MP_AHB4ENSETR |=(0X1<<6);RCC->MP_APB1ENSETR |=(0X1<<16);//2.设置PB2\PG11用于UART4的管脚复用//设置PG11GPIOG->MODER &= (~(0X3<<22));GPIOG->MODER |= (0X2<<22);GPIOG->AFRH &= (~(0XF<<12));GPIOG->AFRH |=(0X6<<12);//设置PB2GPIOB->MODER &= (~(0X3<<4));GPIOB->MODER |= (0X2<<4);GPIOB->AFRH &= (~(0XF<<8));GPIOB->AFRH |=(0X8<<8);//串口禁用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115200USART4->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;//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;
}int strcmp(char *s1,char *s2)
{while(*s1 != '\0'){if(*s1 != *s2){return -1;}s1++;s2++;}return 0;
}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');
}

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));//LED2GPIOF_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));//LED3GPIOE_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));
}

main.c

#include"uart4.h"#include"led.h"int main(){//char a ;char buf[128];uart4_config();all_led_init();while(1){/*	a=getchar();putchar(a+1);putchar('\r');putchar('\n');*/gets(buf);if(strcmp(buf,"led1_on")==0)led1_on();if(strcmp(buf,"led2_on")==0)led2_on();if(strcmp(buf,"led3_on")==0)led3_on();if(strcmp(buf,"led1_off")==0)led1_off();if(strcmp(buf,"led2_off")==0)led2_off();if(strcmp(buf,"led3_off")==0)led3_off();}
}

效果图：