void ButtonInit(void)
{
GpioExport(PIN_KEY_1);
GpioExport(PIN_KEY_2);
GpioExport(PIN_KEY_3);
GpioSetDirection(PIN_KEY_1, 0);
GpioSetDirection(PIN_KEY_2, 0);
GpioSetDirection(PIN_KEY_3, 0);
GpioSetEdge(PIN_KEY_1, edge_falling);
GpioSetEdge(PIN_KEY_2, edge_falling);
GpioSetEdge(PIN_KEY_3, edge_falling);
#ifdef RPI_PULLUP
GpioRpiSetup();
GpioRpiSetPullUpDown(PIN_KEY_1, PUD_UP);
GpioRpiSetPullUpDown(PIN_KEY_2, PUD_UP);
GpioRpiSetPullUpDown(PIN_KEY_3, PUD_UP);
#endif
#ifdef BPI_PULLUP
GpioSetPullResistor(PIN_KEY_1, pull_up);
GpioSetPullResistor(PIN_KEY_2, pull_up);
GpioSetPullResistor(PIN_KEY_3, pull_up);
#endif
}
/*
* Main
*/
int main(int argc, char **argv, char **envp)
{
struct pollfd fdset[2];
int nfds = 2;
int gpioFd, timeout, rc;
char *buf[maxBuff];
unsigned int gpio, led;
bool toggleLED = true;
int len;
if (argc < 2) {
printf("Usage: gpio-int <gpio-pin>\n\n");
printf("Waits for a change in the GPIO pin voltage level or input on stdin\n");
exit(-1);
}
gpio = atoi(argv[1]);
led = atoi(argv[2]);
GpioExport(gpio);
GpioExport(led);
GpioSetDir(gpio, 0);
GpioSetDir(led, 1);
GpioSetEdge(gpio, "rising");
gpioFd = GpioFdOpen(gpio);
timeout = pollTimeout;
while (1) {
memset((void*)fdset, 0, sizeof(fdset));
fdset[0].fd = STDIN_FILENO;
fdset[0].events = POLLIN;
fdset[1].fd = gpioFd;
fdset[1].events = POLLPRI;
rc = poll(fdset, nfds, timeout);
if (rc < 0) {
printf("\npoll() failed!\n");
return -1;
}
if (rc == 0) {
printf(".");
}
if (fdset[1].revents & POLLPRI) {
len = read(fdset[1].fd, buf, maxBuff);
printf("\npoll() GPIO %d interrupt occurred\n", gpio);
if (toggleLED) GpioSetValue(led,0);
else GpioSetValue(led,1);
toggleLED =! toggleLED;
}
if (fdset[0].revents & POLLIN) {
(void)read(fdset[0].fd, buf, 1);
printf("\npoll() stdin read 0x%2.2X\n", (unsigned int) buf[0]);
}
fflush(stdout);
}
GpioFdClose(gpioFd);
return 0;
}
