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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 "fecmodem.h"
#include "storage.h"
#include "system.h"
#define SHUTDOWN_THRESHOLD 2048
System rocket;
extern animation_t ohai;
uint8_t disp_buf[128];
uint8_t *rx_buf = disp_buf + 64;
void System::initialize()
{
// disable ADC to save power
PRR |= _BV(PRADC);
// dito
wdt_disable();
// Enable pull-ups on PC3 and PC7 (button pins)
PORTC |= _BV(PC3) | _BV(PC7);
display.enable();
modem.enable();
storage.enable();
sei();
}
// ! This function has not been tested yet
void System::receive(void)
{
static uint8_t rx_pos = 0;
static uint16_t remaining_bytes = 0;
uint8_t rx_byte = modem.buffer_get();
/*
* START* and PATTERN* are sync signals, everything else needs to be
* stored on the EEPROM.
* (Note that the C++ standard guarantees "rxExpect > PATTERN2" to match
* for HEADER*, META* and DATA since they are located after PATTERN2
* in the RxExpect enum declaration)
*/
if (rxExpect > PATTERN2) {
rx_buf[rx_pos] = modem.buffer_get();
}
switch(rxExpect) {
case START1:
if (rx_byte == 0x99)
rxExpect = START2;
else
rxExpect = START_OR_PATTERN;
break;
case START2:
if (rx_byte == 0x99) {
rxExpect = PATTERN1;
storage.reset();
} else {
rxExpect = START_OR_PATTERN;
}
break;
case START_OR_PATTERN:
if (rx_byte == 0x99)
rxExpect = START2;
else if (rx_byte == 0xa9)
rxExpect = PATTERN2;
else
rxExpect = START_OR_PATTERN;
break;
case PATTERN1:
if (rx_byte == 0xa9)
rxExpect = PATTERN2;
else
rxExpect = START_OR_PATTERN;
break;
case PATTERN2:
if (rx_byte == 0xa9)
rxExpect = HEADER1;
else
rxExpect = START_OR_PATTERN;
break;
case HEADER1:
rxExpect = HEADER2;
rx_pos = 0;
remaining_bytes = (rx_byte & 0x0f) << 8;
break;
case HEADER2:
rxExpect = META1;
remaining_bytes += rx_byte;
break;
case META1:
rxExpect = META2;
break;
case META2:
rxExpect = DATA_FIRSTBLOCK;
break;
case DATA_FIRSTBLOCK:
remaining_bytes--;
if (remaining_bytes == 0) {
rxExpect = START_OR_PATTERN;
storage.save(rx_buf);
} else if (rx_pos == 64) {
rxExpect = DATA;
rx_pos = 0;
storage.save(rx_buf);
}
break;
case DATA:
remaining_bytes--;
if (remaining_bytes == 0) {
rxExpect = START_OR_PATTERN;
storage.append(rx_buf);
} else if (rx_pos == 64) {
rx_pos = 0;
storage.append(rx_buf);
}
break;
}
/*
if (i == 127) {
i = 0;
} else if (modem_byte == 0) {
if (i > 1) { // workaround for trailing double null bytes
ohai.data = disp_buf;
ohai.length = i-1;
display.show(&ohai);
}
i = 0;
}
*/
}
void System::loop()
{
// 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 {
shutdown();
want_shutdown = 0;
}
}
else {
want_shutdown = 0;
}
while (modem.buffer_available()) {
receive();
}
display.update();
}
void System::shutdown()
{
// 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();
// also, reset state machine
rxExpect = START1;
}
ISR(PCINT1_vect)
{
// we use PCINT1 for wakeup, so we should catch it here (and do nothing)
}
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