串口发送命令控制led灯的状态

uart4.h

#ifndef __UART4_H__
#define __UART4_H__
#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_uart.h"

//uart4初始化
void hal_uart4_init();
//发送一个字符
void put_char(const char str);
//发送一个字符串
void put_string(const char* string);
//接收一个字符
char get_char();
//接收一个字符串
char* get_string();

#endif

gpio.h

#ifndef __GPIO_H__
#define __GPIO_H__

//寄存器封装
typedef struct{
	volatile unsigned int MODER;
	volatile unsigned int OTYPER;
	volatile unsigned int OSPEEDR;
	volatile unsigned int PUPDR;
	volatile unsigned int IDR;
	volatile unsigned int ODR;
}gpio_t1;

#define GPIOE1 ((gpio_t1*)0x50006000)
#define GPIOF1 ((gpio_t1*)0x50007000)
#define RCC_AHB4_ENSETR (*(volatile unsigned int*)0x50000A28)
//封装引脚
#define GPIO_PIN_0 0
#define GPIO_PIN_1 1
#define GPIO_PIN_2 2
#define GPIO_PIN_3 3
#define GPIO_PIN_4 4
#define GPIO_PIN_5 5
#define GPIO_PIN_6 6
#define GPIO_PIN_7 7
#define GPIO_PIN_8 8
#define GPIO_PIN_9 9
#define GPIO_PIN_10 10
#define GPIO_PIN_11 11
#define GPIO_PIN_12 12
#define GPIO_PIN_13 13
#define GPIO_PIN_14 14
#define GPIO_PIN_15 15

//模式寄存器封装
typedef enum{
	INPUT,
	OUTPUT,
	ALT,
	ANALOG
}gpio_moder_t;

//输出类型寄存器封装
typedef enum{
	PP,
	OD
}gpio_otyper_t;

//输出速率寄存器封装
typedef enum{
	LOW,
	MED,
	HIGH,
	VERY_HIGH
}gpio_ospeedr_t;

//是否需要上下拉电阻封装
typedef enum{
	NO_PUPD,
	PU,
	PD
}gpio_pupdr_t;

//输出高低电平寄存器封装
typedef enum{
	GPIO_RESET,
	GPIO_SET
}gpio_status_t;

//封装初始化结构体
typedef struct{
	gpio_moder_t moder; //模式 
	gpio_otyper_t otyper; //输出类型 
	gpio_ospeedr_t speed;//速率
	gpio_pupdr_t pupdr; //是否需要上下拉电阻 
}gpio_init_t;

//封装灯的种类
typedef enum
{
	LED1,
	LED2,
	LED3
}leds;

//函数功能：初始化GPIO
//函数参数：
//第一个参数：gpio组编号
//第二个参数：初始化gpio结构体
//第三个参数：引脚编号初始化
void hal_gpio_init(gpio_t1* gpiox,gpio_init_t* init,unsigned int pin);

//函数功能：操作GPIO引脚,实现LED灯亮灭
//函数参数：
//第一个参数：gpio组编号
//第二个参数：引脚编号初始化
//第三个参数：LED灯状态
void hal_gpio_write(gpio_t1* gpiox,unsigned int pin,gpio_status_t status);

#endif

uart4.c

#include "uart4.h"
extern void delay_ms(int ms);

//PB2---->UART4_RX
//PG11---->UART4_TX
//uart4初始化
void hal_uart4_init()
{

	/*****RCC章节初始化********/
	//1.使能GPIOB组控制器 MP_AHB4ENSETR[1] = 1
	RCC->MP_AHB4ENSETR |= (0x1 << 1);
	//2.使能GPIOG组控制器 MP_AHB4ENSETR[6] = 1
	RCC->MP_AHB4ENSETR |= (0x1 << 6);
	//3.使能UART4控制器 MP_APB1ENSETR[16] = 1
	RCC->MP_APB1ENSETR |= (0x1 << 16);

	/*****GPIO章节初始化********/
	//1.设置PB2引脚为复用功能模式 MODER[5:4] = 10
	GPIOB->MODER &= (~(0x3 << 4));
	GPIOB->MODER |= (0x1 << 5);
	//2.设置PB2引脚复用功能为UART4_RX AFRL[11:8] = 1000
	GPIOB->AFRL &= (~(0xf << 8));
	GPIOB->AFRL |= (0x1 << 11);
	//3.设置PG11引脚为复用功能模式 MODER[23:22] = 10 
	GPIOG->MODER &= (~(0x3 << 22));
	GPIOG->MODER |= (0x1 << 23);
	//4.设置PG11引脚复用功能模式为UART4_TX AFRH[15:12] = 0110
	GPIOG->AFRH &= (~(0xf << 12));
	GPIOG->AFRH |= (0x3 << 13);

	/*****UART4章节初始化********/
	//0.判断UE位是否使能
	if(USART4->CR1 & 0x1)
	{
		delay_ms(500);
		USART4->CR1 &= (~(0x1 << 0));
	}
	//1.设置串口1位起始位，8位数据位宽度 CR1[28][12] = 00
	USART4->CR1 &= (~(0x1 << 28));
	USART4->CR1 &= (~(0x1 << 12));
	//2.设置串口无奇偶校验位 CR1[10] = 0
	USART4->CR1 &= (~(0x1 << 10));
	//3.设置串口16倍采样率 CR1[15] = 0
	USART4->CR1 &= (~(0x1 << 15));
	//4.设置串口1位停止位 CR2[13:12] = 00
	USART4->CR1 &= (~(0x3 << 12));
	//5.设置串口不分频 PRESC[3:0] = 0000
	USART4->PRESC &= (~(0xf << 0));
	//6.设置串口波特率为115200 BRR=0x22b
	USART4->BRR |= 0x22b;
	//7.设置发送器使能 CR1[3] = 1
	USART4->CR1 |= (0x1 << 3);
	//8.设置接收器使能 CR1[2] = 1
	USART4->CR1 |= (0x1 << 2);
	//9.设置串口使能 CR1[0] = 1
	USART4->CR1 |= (0x1 << 0);

}
//发送一个字符
void put_char(const char str)
{
	//1.判断发送数据寄存器是否为空 ISR[7]
	//读0:发送数据寄存器为满，需要等待
	//读1:发送数据寄存器为空，可以发送下一个字节
	while(!(USART4->ISR & (0x1 << 7)));
	//2.将要发送的字符，写入到发送数据寄存器中
	USART4->TDR = str;
	//3.判断发送数据是否完成
	//读0：发送数据没有完成
	//读1：发送数据完成
	while(!(USART4->ISR & (0x1 << 6)));
}

//发送一个字符串
void put_string(const char* string)
{
	//判断是否为'\0'
	while(*string)
	{
		put_char(*string++);
	}
	put_char('\n');
	put_char('\r');
}
//接收一个字符
char get_char()
{
	char ch;
	//1.判断接收数据寄存器是否为空
	//读0:接收数据寄存器为空
	//读1:接收数据寄存器中有数据
	while(!(USART4->ISR & (0x1 << 5)));
	ch = USART4->RDR;//2.接收到数据
	return ch;
}

char buffer[50] = {0};
//接收一个字符串
char* get_string()
{
	int i;
	//循环实现数据收发
	for(i=0;i<49;i++)
	{
		buffer[i] = get_char(); //接收一个字符
		put_char(buffer[i]); //发送一个字符 
		if(buffer[i] == '\r') //判断键盘enter键是否按下
			break;
	}
	buffer[i] = '\0';
	put_char('\n');
	return buffer;
}

gpio.c

#include "gpio.h"

void hal_gpio_init(gpio_t1* gpiox,gpio_init_t* init,unsigned int pin)
{
	//1.设置gpio引脚模式
	gpiox->MODER &= (~(0x3 << (pin * 2)));
	gpiox->MODER |= (init->moder << (pin * 2));

	//2.设置输出类型
	gpiox->OTYPER &= (~(0x1 << pin));
	gpiox->OTYPER |= (init->otyper << pin);

	//3.设置输出速率
	gpiox->OSPEEDR &= (~(0x3 << (pin * 2)));
	gpiox->OSPEEDR |= (init->speed << (pin * 2));

	//4.设置是否需要上下拉电阻
	gpiox->PUPDR &= (~(0x3 << (pin * 2)));
	gpiox->PUPDR |= (init->pupdr << (pin * 2));
}


void hal_gpio_write(gpio_t1* gpiox,unsigned int pin,gpio_status_t status)
{
	if(status == GPIO_RESET)
	{
		gpiox->ODR &= (~(0x1 << pin));
	}else{
		gpiox->ODR |= (0x1 << pin);
	}

}

main.c

#include "uart4.h"
#include "gpio.h"

typedef struct 
{
	char* commond;
	gpio_t1* gpio;
	unsigned int pin;
	gpio_status_t stat;
	void (*callback)(gpio_t1* gpiox,unsigned int pin,gpio_status_t status);
}commond_t;

extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
	int i,j;
	for(i = 0; i < ms;i++)
		for (j = 0; j < 1800; j++);
}

commond_t com_code[6] = {
		[0] = {
			.commond = "led1on",
			.gpio = GPIOE1,
			.pin = GPIO_PIN_10,
			.stat = GPIO_SET,
			.callback = hal_gpio_write,
		},
		[1] = {
			.commond = "led1off",
			.gpio = GPIOE1,
			.pin = GPIO_PIN_10,
			.stat = GPIO_RESET,
			.callback = hal_gpio_write,
		},
		[2] = {
			.commond = "led2on",
			.gpio = GPIOF1,
			.pin = GPIO_PIN_10,
			.stat = GPIO_SET,
			.callback = hal_gpio_write,
		},
		[3] = {
			.commond = "led2off",
			.gpio = GPIOF1,
			.pin = GPIO_PIN_10,
			.stat = GPIO_RESET,
			.callback = hal_gpio_write,
		},
		[4] = {
			.commond = "led3on",
			.gpio = GPIOE1,
			.pin = GPIO_PIN_8,
			.stat = GPIO_SET,
			.callback = hal_gpio_write,
		},
		[5] = {
			.commond = "led3off",
			.gpio = GPIOE1,
			.pin = GPIO_PIN_8,
			.stat = GPIO_RESET,
			.callback = hal_gpio_write,
		}
	};

//判断命令
commond_t* switch_commond(char* str,commond_t* com);

//比较字符串
int cmp(const char* deststr,const char* srcstr);

//led灯初始化
void ledinit(void)
{
	//1.时钟使能
	RCC_AHB4_ENSETR |= (0x3 << 4);
	//2.初始化结构体
	gpio_init_t init = {OUTPUT,PP,LOW,NO_PUPD};
	//3.调用gpio初始化函数
	hal_gpio_init(GPIOE1,&init,GPIO_PIN_10);
	hal_gpio_init(GPIOF1,&init,GPIO_PIN_10);
	hal_gpio_init(GPIOE1,&init,GPIO_PIN_8);
}

int main()
{
	char* str = 0;
	commond_t* cnt = 0;
	//初始化操作
	ledinit();
	hal_uart4_init();//串口初始化

	while(1)
	{
		//输入命令
		put_string("please input>");
		str = get_string();
		//判断命令
		cnt = switch_commond(str,com_code);
		//如果命令存在 则改变灯的状态
		if(cnt)
			cnt->callback(cnt->gpio,cnt->pin,cnt->stat);
		else
			put_string("no this commond code");
	}
	return 0;
}

//比较字符串
int cmp(const char* deststr,const char* srcstr)
{
	while((*deststr++ == *srcstr++) && *deststr != '\0');
	return *(--deststr) - *(--srcstr);
}

//判断命令
commond_t* switch_commond(char* str,commond_t* com)
{
	int i = 0;
	for(i = 0;i < 6;i++)
	{
		if(!cmp(str,com[i].commond))
		{
			return &com[i];
		}
	}
	return 0;
}

实验现象