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jetgpio_PWM_example.cpp
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jetgpio_PWM_example.cpp
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/* Usage example of the JETGPIO library
* Compile with: g++ -Wall -o jetgpio_PWM_example jetgpio_PWM_example.cpp -ljetgpio
* Execute with: sudo ./jetgpio_PWM_example
*/
#include <iostream>
#include <unistd.h>
#include <jetgpio.h>
int main(int argc, char *argv[])
{
int Init;
Init = gpioInitialise();
if (Init < 0)
{
/* jetgpio initialisation failed */
printf("Jetgpio initialisation failed. Error code: %d\n", Init);
exit(Init);
}
else
{
/* jetgpio initialised okay*/
printf("Jetgpio initialisation OK. Return code: %d\n", Init);
}
/* Setting up PWM frequency=10kHz @ pin 32 */
int PWMstat = gpioSetPWMfrequency(32, 10000);
if (PWMstat < 0)
{
/* PWM frequency set up failed */
printf("PWM frequency set up failed. Error code: %d\n", PWMstat);
exit(Init);
}
else
{
/* PWM frequency set up okay*/
printf("PWM frequency set up okay at pin 32. Return code: %d\n", PWMstat);
}
/* Set up PWM duty cycle to approx 50% (0=0% to 256=100%) @ pin 32*/
int PWMstat2 = gpioPWM(32, 127);
if (PWMstat2 < 0)
{
/* PWM start on failed */
printf("PWM start failed. Error code: %d\n", PWMstat2);
exit(Init);
}
else
{
/* PWM started on okay*/
printf("PWM started up okay at pin 32. Return code: %d\n", PWMstat2);
}
int x =0;
printf("PWM going at pin 32 for 60 seconds\n");
while (x<30) {
sleep(2);
x++;
}
// Terminating library
gpioTerminate();
printf("PWM stopped, bye!\n");
exit(0);
}