NUCLEO-F410RB 连续按键检测代码

最新推荐文章于 2025-10-31 09:47:32 发布

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原文链接：https://os.mbed.com/questions/81314/i-have-problem-with-push-button-counter/

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#连续按键检测

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本文介绍了一个使用mbed库的C++程序，通过STM32微控制器上的按钮控制LED的状态变化。程序实现了按钮的中断检测，以及根据不同按钮按压次数改变PWM输出，从而控制LED的亮度和闪烁模式。

#include "mbed.h"

DigitalOut led(LED1);
PwmOut pwm(PA_7);

InterruptIn button1(USER_BUTTON);
volatile bool button1_pressed = false; 

int pressTheButton();
void LED(int);

// ISR handling button pressed event
void button1_onpressed_cb(void)
{
    if (button1.read()==0) {
        wait_ms(20);
			if(button1.read()==0)
			{
				button1_pressed=true;
			}
			else button1_pressed=false;
    }
		else button1_pressed=false;
}

void button1_high(void)
{
	button1_pressed=false;
}

int main(void)
{
    //button1.mode(PullUp); // Activate pull-up
    button1.fall(&button1_onpressed_cb); // Attach ISR to handle button press event
	button1.rise(&button1_high);
	int status=0;
	printf("System setup OK.\r\n");
	status=pressTheButton();			
	LED(status);
}


int pressTheButton()		//control the status
{
	int i=0;
	int status=0;
	while(1)
	{
		if (button1_pressed) { // 1st press
				while(button1_pressed);
				while(!button1_pressed) 
				{
					wait_ms(1);
					i++;
					if(i>500) { status = 1; return status;}
				}
				i=0;
				if (button1_pressed) { // 2nd press
					while(button1_pressed);
					while(!button1_pressed)
					{
						wait_ms(1);
						i++;
						if(i>500) { status=2; return status;}
					}
					if(button1_pressed) { // 3rd press
						status = 3;
						return status;
					}
					else { status=2; return status; }
				}
				else { status=1; return status; }
		}
		else status = 0;
	}
}
void LED(int status)
{
	float i = 0.5;		//dc
	bool flag = true;
	float dc = 1.0;
	int delay = 1000;//change freq of LED blinking
	pwm.period_ms(10);
	led.write(PA_7);
	if(status==1)
	{
		while(1)
		{
			pwm.write(i);
			if(flag){
					i+=0.01;
					if(i>=1.0) flag=false;
				}
				else {
					i-=0.01;
					if(i<=0) flag=true;
				}
				wait_ms(20);
		}
	}
	else if(status == 2 || status == 3)
	{
		while(1)
		{
			pwm.write(dc);
			if(dc == 1.0) dc = 0;
			else dc = 1.0;
			if(status == 2) delay=1000;
			else delay=200;
			wait_ms(delay);
		}
	}
	else 
	{
		while(1)
		{
			pwm.write(0.0);
		}
	}
}