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1.通过操作Cortex-A7核，串口输入相应的命令，控制LED灯进行工作
例如在串口输入led1on,开饭led1灯点亮
2.例如在串口输入led1off,开饭led1灯熄灭
3.例如在串口输入led2on,开饭led2灯点亮
4.例如在串口输入led2off,开饭led2灯熄灭
5.例如在串口输入led3on,开饭led3灯点亮
6.例如在串口输入led3off,开饭led3灯熄灭
2.编程要求：
1）结构体封装
typedef struct{
char* cmd_arr; //命令行字符串
gpio_t* gpiox;//GPIO组号
unsigned int pin; //引脚编号
status_t status; //LED灯状态
void(*gpio_write_pin)(gpio_t* gpiox,unsigned int pin,status_t status);
}cmd_t;
2）结构体数组
方式1：cmd_t cmd_arr[6] = {{"led1off",GPIOE,GPIO_PIN_10,GPIO_RESET_T},{},};
cmd_t cmd_arr[6] = {
[0] ={ .cmd_arr = "led1off", .gpiox = GPIOE, .pin = GPIO_PIN_10, .status = GPIO_RESET_T, .gpio_write_pin = hal_gpio_write, }, [1] = {}, [2] = {}, };
3）在串口输入一个字符串
1>在串口输入一个字符串，需要定义一个变量接收，串口接收到的字符串 char* string = uart_get_string();
2>串口中输入的字符串，与结构体中每个元素中的cmd_arr变量进行比较
3>如果比较成功，代表查到输入的字符串 思考：函数实现如何编写？
cmd_t* find_command(const char* str) {
//串口中输入的字符串，与结构体中每个元素中的cmd_arr变量进行比较
//遍历比较，自己编写strcmp比较的函数 return 0;
//失败返回0 }
4）思考main.c函数编写
cmd_t* cmd_arr;
char* string = uart_get_string();
cmd_arr = find_command(string);
if(cmd_arr == 0)
{
查找失败
}else {
cmd_arr->gpio_write_pin(cmd_arr->gpiox,...........)
}
头文件
#ifndef __TEST_H__
#define __TEST_H__#include "stm32mp1xx_rcc.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_uart.h"
#include "gpio.h"typedef struct{char* cmd_str; //命令行字符串gpio_t* gpiox; //GPIO组号unsigned int pin; //引脚编号gpio_status_t status; //LED灯状态void(*gpio_write_pin)(gpio_t* gpiox,unsigned int pin,gpio_status_t status);
}cmd_t;//UART初始化
void uart_init();
//LED初始化
void LED_init(gpio_t* GPIOX,unsigned int PIN);
//发送一个字符
void put_char(const char ch);
//接收一个字符
char get_char();
//发送一个字符串
void put_string(const char* str);
//接收一个字符串
char* get_string();
//点亮LED
void LED_lighting(gpio_t* GPIOX,unsigned int PIN,gpio_status_t status);
//字符串比较函数
int strcmp(const char* string,const char* arr_string);
cmd_t* find_command(const char* str);#endif
源文件
#include "test.h"cmd_t cmd_arr[6] = { [0] ={ .cmd_str = "led1on", .gpiox = GPIOE, .pin = gpio_PIN_10, .status = gpio_set, .gpio_write_pin = LED_lighting, }, [1] ={ .cmd_str = "led1off", .gpiox = GPIOE, .pin = gpio_PIN_10, .status = gpio_reset, .gpio_write_pin = LED_lighting, }, [2] ={ .cmd_str = "led2on", .gpiox = GPIOF, .pin = gpio_PIN_10, .status = gpio_set, .gpio_write_pin = LED_lighting, }, [3] ={ .cmd_str = "led2off", .gpiox = GPIOF, .pin = gpio_PIN_10, .status = gpio_reset, .gpio_write_pin = LED_lighting, }, [4] ={ .cmd_str = "led3on", .gpiox = GPIOE, .pin = gpio_PIN_8, .status = gpio_set, .gpio_write_pin = LED_lighting, }, [5] ={ .cmd_str = "led3off", .gpiox = GPIOE, .pin = gpio_PIN_8, .status = gpio_reset, .gpio_write_pin = LED_lighting, }
}; //UART初始化
void uart_init(){//RCC_AHB4ENSETRRCC->MP_AHB4ENSETR |= (0x1<<1); //GPIOB使能RCC->MP_AHB4ENSETR |= (0x1<<6); //GPIOG使能//RCC_APB1ENSETRRCC->MP_APB1ENSETR |= (0x1<<16); //UART4使能//GPIOBGPIOB->MODER &= (~(0x3<<4)); //GPIOB_MODER设置复用功能模式GPIOB->MODER |= (0x1<<5);GPIOB->AFRL &= (~(0xf<<8)); //设置GPIOB引脚功能复用模式 GPIOB->AFRL |= (0x1<<11);//GPIOGGPIOG->MODER &= (~(0x3<<22)); //GPIOG_MODER设置复用功能模式GPIOG->MODER |= (0x1<<23);GPIOG->AFRH &= (~(0xf<<12)); //设置GPIOG引脚功能复用模式 GPIOG->AFRH |= (0x3<<13);//uart初始化USART4->CR1 &= (~(0x1<<0)); //判断UE是否等于0USART4->CR1 &= (~(0x1<<12)); USART4->CR1 &= (~(0x1<<28)); //设置数据位宽度为8位USART4->CR2 &= (~(0x3<<12)); //设置1位停止位USART4->CR1 &= (~(0x1<<15)); //设置16倍采样率USART4->CR1 &= (~(0x1<<10)); //设置串口无奇偶位USART4->BRR = 0x22B;USART4->CR1 &= (~(0x1<<3)); USART4->CR1 |= (0x1<<3); //发送使能USART4->CR1 &= (~(0x1<<2)); USART4->CR1 |= (0x1<<2); //接收器使能USART4->PRESC &= (~(0xf<<0)); //一级分配USART4->CR1 |= (0x1<<0); //UART使能
}//LED初始化
void LED_init(gpio_t* GPIOX,unsigned int PIN){//RCC_AHB4ENSETRif(GPIOX == GPIOE){RCC->MP_AHB4ENSETR |= (0x1<<4); //GPIOE使能}else{RCC->MP_AHB4ENSETR |= (0x1<<5); //GPIOF使能}//GPIOXGPIOX->MODER &= (~(0x3<<(PIN*2))); //设置输出模式GPIOX->MODER |= (0x1<<(PIN*2));GPIOX->OTYPER &= (~(0x1<<PIN)); //设置推挽输出GPIOX->OSPEEDR &= (~(0x3<<(PIN*2))); //设置低速输出模式GPIOX->PUPDR &= (~(0x3<<(PIN*2))); //设置禁止上下拉电阻}
//发送一个字符
void put_char(const char ch){//判断发送寄存器是否为空while(!(USART4->ISR & (0x1<<7)));//将数据放入发送寄存器中USART4->TDR = ch;//如果字符是\n，则再发送一个回车\rif(ch == '\n'){while(!(USART4->ISR & (0x1<<7)));USART4->TDR = '\r';}//判断一帧数据是否发送成功while(!(USART4->ISR & (0x1<<6)));}
//接收一个字符
char get_char(){char ch;//判断接收数据寄存器是否为空while(!(USART4->ISR & (0x1<<5)));//将接收到的数据放入接收数据寄存器中ch = USART4->RDR;return ch;
}
//发送一个字符串
void put_string(const char* str){//循环发送字符for(int i=0; str[i]!='\0'; i++){put_char(str[i]);}put_char('\n');put_char('\r');
}
char buf[50]={0};
//接收一个字符串
char* get_string(){int i = 0;for(i=0; (buf[i]=get_char()) != '\r';i++){put_char(buf[i]);}buf[i]='\0';put_char('\n');put_char('\r');return buf;
}
//点亮LED
void LED_lighting(gpio_t* GPIOX,unsigned int PIN,gpio_status_t status){if(status == gpio_set){ //如果num=1，则点亮灯GPIOX->ODR |= (0x1<<PIN);}else{ //否则熄灭灯GPIOX->ODR &= (~(0x1<<PIN));}
}
//字符串比较函数
int strcmp(const char* string,const char* arr_string){while((*string != '\0') && (*arr_string != '\0')){if(*string > *arr_string){return *string-*arr_string;}else if(*string < *arr_string){return *string-*arr_string;}string++;arr_string++;}return 0;
}
cmd_t* find_command(const char* str){for(int i=0; i<6;i++){if(strcmp(str,cmd_arr[i].cmd_str)==0){return &cmd_arr[i];}}return 0;
}
main.c
#include "test.h"
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++);
}int main()
{ //初始化UARTuart_init();//初始化LED1LED_init(GPIOE,10);//初始化LED2LED_init(GPIOF,10);//初始化LED3LED_init(GPIOE,8);put_string("UART AND LED TEST!!!");while(1){cmd_t* cmd_p;char* string = get_string();cmd_p = find_command(string); //让接收到的字符串进行比较if(cmd_p == 0){printf("输入错误\n");}else{cmd_p->gpio_write_pin(cmd_p->gpiox,cmd_p->pin,cmd_p->status);}}return 0;
}运行结果
