[BPI-M3] BPI Buzzer_PWM and how to use

BPI accessories
1

OS: BPI-M3 Ubuntu15.10 (Kernel3.4) Version: 1.0 HDMI

Buzzer Power - Pin 7  - GPIO4
Buzzer GND   - Pin 9  - GND

Step 1: Download WiringPI

$ git clone https://github.com/BPI-SINOVOIP/BPI-WiringPi.git -b BPI_M3 $ cd BPI-WiringPi $ chmod +x ./build $ sudo ./build

Step 2 : Copy smaple code to Buz_pwm.c file

$ sudo vi Buz_pwm.c

Step 3 : Compile Buz_pwm.c

$ gcc -o Buz_pwm Buz_pwm.c -l wiringPi -lpthread

Step 4 : Run Buz_pwm

$ sudo ./Buz_pwm

Video Demo:

Sample Code:

#include <stdio.h>
#include <string.h> 
#include <errno.h>

#include<wiringPi.h>
#include<softPwm.h>

int buz=7;
int pwm,pwmmax=50,count;

int main(){
if (wiringPiSetup() < 0)
{
    fprintf (stderr, "Unable to open device: %s\n", strerror (errno)) ;
    return 1 ;
}

if(softPwmCreate(buz,pwm,pwmmax)<0)
{
    fprintf (stderr, "Unable to open pwm  device: %s\n", strerror (errno)) ;
    return 1 ;
}
for(count=0;count<100;count++)
{
softPwmWrite(buz,count);
delay(50);
}

/*
pinMode(7,OUTPUT);
while(1)
{
digitalWrite(0,LOW);
delay(2000);//0.5 second or sleep(1)=1 second
digitalWrite(0,HIGH);
delay(300);//0.5 second
}
*/
}