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#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include <stdlib.h>
#include "display.h"
#include "modem.h"
#include "system.h"
#define SHUTDOWN_THRESHOLD 2048
System rocket;
uint8_t disp_buf[128];
void System::loop()
{
static uint8_t i = 0;
uint8_t modem_byte;
// both buttons are pressed
if ((PINC & (_BV(PC3) | _BV(PC7))) == 0) {
// naptime!
// But not before both buttons have been pressed for
// SHUTDOWN_THRESHOLD * 0.256 ms. And then, not before both have
// been released, because otherwise we'd go te sleep when
// they're pressed and wake up when they're released, which
// isn't really the point here.
if (want_shutdown < SHUTDOWN_THRESHOLD) {
want_shutdown++;
}
else {
// turn off display to indicate we're about to shut down
display.disable();
modem.disable();
// wait until both buttons are released
while (!((PINC & _BV(PC3)) && (PINC & _BV(PC7)))) ;
// and some more to debounce the buttons
_delay_ms(10);
// actual naptime
// enable PCINT on PC3 (PCINT11) and PC7 (PCINT15) for wakeup
PCMSK1 |= _BV(PCINT15) | _BV(PCINT11);
PCICR |= _BV(PCIE1);
// go to power-down mode
SMCR = _BV(SM1) | _BV(SE);
asm("sleep");
// execution will resume here - disable PCINT again.
// Don't disable PCICR, something else might need it.
PCMSK1 &= ~(_BV(PCINT15) | _BV(PCINT11));
// turn on display
display.enable();
// ... and modem
modem.enable();
want_shutdown = 0;
}
}
else {
want_shutdown = 0;
}
while (modem.buffer_available()) {
modem_byte = modem.buffer_get();
disp_buf[i++] = modem_byte;
if (i == 127) {
i = 0;
} else if (modem_byte == 0) {
i = 0;
display.show(disp_buf);
}
}
}
ISR(PCINT1_vect)
{
// we use PCINT1 for wakeup, so we should catch it here (and do nothing)
}
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