int on_mode_press(){
printf("pressed mode\n");
if(get_pause_button_state() == 1){
//both buttons pressed exit cleanly
set_state(EXITING);
}
return 0;
}
/******************************************************************
* void* pause_unpressed_handler(void* ptr)
*
* wait on rising edge of pause button
*******************************************************************/
void* pause_unpressed_handler(void* ptr){
struct pollfd fdset[1];
char buf[MAX_BUF];
int gpio_fd = gpio_fd_open(PAUSE_BTN);
fdset[0].fd = gpio_fd;
fdset[0].events = POLLPRI; // high-priority interrupt
// keep running until the program closes
while(get_state() != EXITING) {
// system hangs here until FIFO interrupt
poll(fdset, 1, POLL_TIMEOUT);
if (fdset[0].revents & POLLPRI) {
lseek(fdset[0].fd, 0, SEEK_SET);
read(fdset[0].fd, buf, MAX_BUF);
if(get_pause_button_state()==UNPRESSED){
pause_unpressed_func();
}
}
}
gpio_fd_close(gpio_fd);
return 0;
}
/************************************************************************
* on_pause_press
* If the user holds the pause button for a second, exit cleanly
* disarm on momentary press
************************************************************************/
int on_pause_press(){
int i=0;
const int samples = 100; // check for release 100 times in this period
const int us_wait = 2000000; // 2 seconds
switch(get_state()){
// pause if running
case EXITING:
return 0;
case RUNNING:
set_state(PAUSED);
disarm_controller();
setRED(HIGH);
setGRN(LOW);
break;
case PAUSED:
set_state(RUNNING);
disarm_controller();
setGRN(HIGH);
setRED(LOW);
break;
default:
break;
}
// now wait to see if the user wants to shut down the program
while(i<samples){
usleep(us_wait/samples);
if(get_pause_button_state() == UNPRESSED){
return 0; //user let go before time-out
}
i++;
}
printf("long press detected, shutting down\n");
//user held the button down long enough, blink and exit cleanly
blink_red();
set_state(EXITING);
return 0;
}