电路分析

• 引脚为P37
• 开关未按下时，P37是高电平
• 开关按下时，GND导通，P37是低电平

编程思路

• Driver目录中添加KEY.h文件，应包含引脚定义、开关GPIO实例化函数、开关状态获取函数以及当按下和未按下时执行不同的函数（函数指针作为函数参数）
• Driver目录中添加KEY.c文件，做具体实现

代码示例

KEY.H

#ifndef	__KEY_H
#define	__KEY_H
#include "GPIO.h"

#define KEY_PIN P37

void KEY_init();
void Key_Get_State(void(*keydown)(),void(*keyup)());

#endif

KEY.C

#include "Key.h"

void KEY_init(){
	GPIO_InitTypeDef	GPIO_InitStructure;		//结构定义
	GPIO_InitStructure.Pin  = GPIO_Pin_7;		//指定要初始化的IO,
	GPIO_InitStructure.Mode = GPIO_OUT_PP;	//指定IO的输入或输出方式,GPIO_PullUp,GPIO_HighZ,GPIO_OUT_OD,GPIO_OUT_PP
	GPIO_Inilize(GPIO_P3, &GPIO_InitStructure);//初始化

}
u8 last_state=1;
void Key_Get_State(void(*keydown)(),void(*keyup)()){
	
	if (last_state==1&& KEY_PIN==0){
		if(keydown != NULL){
			keydown();
		}
		last_state=0;
	}else if(last_state==0&& KEY_PIN==1){
		if(keyup != NULL){
			keyup();
		}
		last_state=1;
	}
}

main.ｃ

#include "RTX51TNY.h"
#include "GPIO.h"
#include "NVIC.h"
#include "UART.h"
#include "Switch.h"
#include "LED.h"
#include "Key.h"


#define TASK_MAIN 0
#define TASK_LED 1
#define TASK_KEY 2

void UART_config(void) {
	// >>> 记得添加 NVIC.c, UART.c, UART_Isr.c <<<
    COMx_InitDefine		COMx_InitStructure;					//结构定义
    COMx_InitStructure.UART_Mode      = UART_8bit_BRTx;	//模式, UART_ShiftRight,UART_8bit_BRTx,UART_9bit,UART_9bit_BRTx
    COMx_InitStructure.UART_BRT_Use   = BRT_Timer1;			//选择波特率发生器, BRT_Timer1, BRT_Timer2 (注意: 串口2固定使用BRT_Timer2)
    COMx_InitStructure.UART_BaudRate  = 115200ul;			//波特率, 一般 110 ~ 115200
    COMx_InitStructure.UART_RxEnable  = ENABLE;				//接收允许,   ENABLE或DISABLE
    COMx_InitStructure.BaudRateDouble = DISABLE;			//波特率加倍, ENABLE或DISABLE
    UART_Configuration(UART1, &COMx_InitStructure);		//初始化串口1 UART1,UART2,UART3,UART4

  	NVIC_UART1_Init(ENABLE,Priority_1);		//中断使能, ENABLE/DISABLE; 优先级(低到高) Priority_0,Priority_1,Priority_2,Priority_3
    UART1_SW(UART1_SW_P30_P31);		// 引脚选择, UART1_SW_P30_P31,UART1_SW_P36_P37,UART1_SW_P16_P17,UART1_SW_P43_P44
}



void task_led() _task_ TASK_LED{
	
	while(1){
		
		// left
		LED_ON(left);
		os_wait2(K_TMO, 100);
		
		LED_OFF(left);
		os_wait2(K_TMO, 100);
		
		// right
		LED_ON(right);
		os_wait2(K_TMO, 100);
		
		LED_OFF(right);
		os_wait2(K_TMO, 100);
		
		// Hazard lights
		LED_ON(all);
		os_wait2(K_TMO, 100);
		
		// all off
		LED_OFF(all);
		os_wait2(K_TMO, 100);
	
	}
}

void keydown(){
	printf("key down");
}

void keyup(){
	printf("key up");
}

void task_key() _task_ TASK_KEY{
	KEY_init();
	while(1){
		Key_Get_State(keydown,keyup);
		os_wait2(K_TMO, 4);
	}
}

void task_main() _task_ TASK_MAIN{
	EA=1;
	//LED_init();
	UART_config();
	
	// os_create_task(TASK_LED);
	os_create_task(TASK_KEY);
	os_delete_task(0);
}