io_shiled_test.c

// blink.c
//
// Example program for bcm2835 library
// Blinks a pin on an off every 0.5 secs
//
// After installing bcm2835, you can build this 
// with something like:
// gcc -o blink blink.c -l bcm2835
// sudo ./blink
//
// Or you can test it before installing with:
// gcc -o blink -I ../../src ../../src/bcm2835.c blink.c
// sudo ./blink
//  
// Author: Mike McCauley
// Copyright (C) 2011 Mike McCauley
// $Id: RF22.h,v 1.21 2012/05/30 01:51:25 mikem Exp $

#include <bcm2835.h>
#include <stdio.h>
// Blinks on RPi Plug P1 pin 11 (which is GPIO pin 17)
#define LED1  5
#define LED2  6
#define LED3  13
#define LED4  26
#define LED5 12
#define COM 22
#define RELAY 27
#define PWM0 18
#define PWM1 19
#define IR_TX 25
#define IR_RX 17
#define DIP1 20 
#define DIP2 21
#define BUTTON1 24
#define BUTTON2 23
#define BUZZER 16
 
int main(int argc, char **argv)
{
    // If you call this, it will not actually access the GPIO
    // Use for testing
//    bcm2835_set_debug(1);
  int i;
  int value1,value2,value3,value4;
  int prev_state=0;
  int prev_state_relay=0;
    int led_array[]={LED2,LED4,LED3,LED5};
  int n=sizeof(led_array)/sizeof(led_array[0]);
    if (!bcm2835_init())
	return 1;

 

    // Set the p5in to be an output
	  bcm2835_gpio_fsel(COM, BCM2835_GPIO_FSEL_OUTP);
	  bcm2835_gpio_write(COM, HIGH);
      
	   bcm2835_gpio_fsel(LED1, BCM2835_GPIO_FSEL_OUTP);
      bcm2835_gpio_fsel(BUZZER, BCM2835_GPIO_FSEL_OUTP);
	  bcm2835_gpio_write(BUZZER, LOW);
	  
	   bcm2835_gpio_fsel(RELAY, BCM2835_GPIO_FSEL_OUTP);
	  
	  //DIP. button setup as input
	 bcm2835_gpio_fsel(DIP1, BCM2835_GPIO_FSEL_INPT); 
	 bcm2835_gpio_fsel(DIP2, BCM2835_GPIO_FSEL_INPT); 
	 bcm2835_gpio_fsel(BUTTON1, BCM2835_GPIO_FSEL_INPT); 
	 bcm2835_gpio_fsel(BUTTON2, BCM2835_GPIO_FSEL_INPT); 
   
     //set pwm0, pwm1
	 
    bcm2835_gpio_fsel(PWM0,BCM2835_GPIO_FSEL_ALT5); //set gpio for PWM0
    bcm2835_pwm_set_clock(1920);   //set min frequence =19.2M/1920
    bcm2835_pwm_set_mode(0,1,1);   //(channel,PWM0 MSEN enable , PWM0 enable)
    bcm2835_pwm_set_range(0,200);  //set period=20ms
      
	for (i=0;i<n;i++) {
      bcm2835_gpio_fsel(led_array[i], BCM2835_GPIO_FSEL_OUTP);
	  bcm2835_gpio_write(led_array[i], LOW);
    }
    i=0;
    
    while (1)
    {
	
     value1= bcm2835_gpio_lev(DIP1);
	 value2= bcm2835_gpio_lev(DIP2);
	 value3= bcm2835_gpio_lev(BUTTON1);
	 value4= bcm2835_gpio_lev(BUTTON2);
	 printf("DIP1=%d,DIP2=%d,BUTTON1=%d,BUTTON2=%d\n", value1,value2,value3,value4);		
		
		
	// led blinking 
	bcm2835_gpio_write(led_array[i], HIGH);
	bcm2835_delay(100);
	bcm2835_gpio_write(led_array[i], LOW);

  
	
		//check led1
	if (value1==0 && value2==0) {
	   	i=(i+1)%n;
	  	bcm2835_gpio_write(LED1, HIGH);
	} else {
		 i=(i-1)%n; if (i<0) i=n-1;
		 bcm2835_gpio_write(LED1, LOW);
	}

	//check buzzer
	if (value3==0 && value4==0) {
	  	bcm2835_gpio_write(BUZZER, HIGH);
	 
    } else {
		 bcm2835_gpio_write(BUZZER, LOW);

	}
	
	//check relay
	if (value4==0) {
		bcm2835_gpio_write(LED1, HIGH);
		bcm2835_gpio_write(RELAY, LOW);

	  	
   } else if (value4==1) {	
		bcm2835_gpio_write(LED1, LOW);   
        bcm2835_gpio_write(RELAY, HIGH);

	} 
	

		//check pwm0
	if (value3==0 && prev_state!=1) {
		bcm2835_pwm_set_mode(0,1,1); 
		prev_state=1;
	  	bcm2835_pwm_set_data(0,20);  //set pulse width 
   } else if (value3==1 && prev_state!=0) {		
       bcm2835_pwm_set_mode(0,1,1); 
		bcm2835_pwm_set_data(0,5);  //set pulse width 
		prev_state=0;
	} else {
		
		bcm2835_pwm_set_mode(0,1,0); 
	}
	
	bcm2835_delay(100);
    }
    bcm2835_close();
    return 0;
}