How to use PWM Channels on Navio+ board?

Navio / Edge Hardware
1

Hi, there

I’m trying to control PWM channels on Navio+ board but it’s not working.
I just want to control a LED using PWM Channel.

when I execute the file, Any Channels doesn’t work on the Navio+ board. (0V)
and the Terminal has displayed “Failed to open device : No such file or directory”.

Please let me know, if somebody know how to solve this problem.

Thanks.

define NAVIO_RCOUTPUT_1 3
define SERVO_MIN 1.250 /mS/
define SERVO_MAX 1.750 /mS/

include "Navio/MPU9250.h"
include "Navio/gpio.h"
include "Navio/PCA9685.h"
using namespace Navio;

//=============================================================================

int main()
{
//-------------------------------------------------------------------------
MPU9250 imu;
imu.initialize();
uint16_t signal = 0;
float ax, ay, az, gx, gy, gz, mx, my, mz;
//-------------------------------------------------------------------------
static const uint8_t outputEnablePin = RPI_GPIO_27;
Pin pin(outputEnablePin);

    if (pin.init()) 
{
  	   pin.setMode(Pin::GpioModeOutput);
 	   pin.write(0); /* drive Output Enable low */
   fprintf(stderr, "Output Enable");
} 
else 
{
 	   fprintf(stderr, "Output Enable not set. Are you root?");
}
PCA9685 pwm;
pwm.initialize();
uint16_t R = 0;
pwm.setPWM(0, R);

while(1)
{

    for (R = 0; R < 4095; R++)
        pwm.setPWM(0, R);

    for (R = 4095; R > 0; R--)
        pwm.setPWM(0, R);

}
/*
while(1) {
imu.getMotion9(&ax, &ay, &az, &gx, &gy, &gz, &mx, &my, &mz);

    //printf("Acc: %+05.3f %+05.3f %+05.3f ", ax, ay, az);
    printf("Gyr: %+05.3f %+05.3f %+05.3f \n", gx, gy, gz);
//printf("Mag: %+05.3f %+05.3f %+05.3f\n", mx, my, mz);


    sleep(0.5);
pin.write(1);

//printf("%d", imu.testConnection());

}
*/
return 0;
}

2

I got it. the reason is wrong setting on i2c dev. :slight_smile: