From 9e66404e8e704037aff06713ed0cdfa43fc1b220 Mon Sep 17 00:00:00 2001 From: Daniel Friesel Date: Fri, 15 Jan 2016 16:26:32 +0100 Subject: move sources to src and build files to build --- src/main.cc | 217 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 217 insertions(+) create mode 100644 src/main.cc (limited to 'src/main.cc') diff --git a/src/main.cc b/src/main.cc new file mode 100644 index 0000000..c51483d --- /dev/null +++ b/src/main.cc @@ -0,0 +1,217 @@ +#include +#include +#include +#include +#include + +#include "font2.h" + +#define SHUTDOWN_THRESHOLD 2048 + +volatile uint8_t disp[8]; + +class System { + private: + uint16_t want_shutdown; + public: + System() { want_shutdown = 0; }; + void loop(void); + void shutdown(void); +}; + +class Display { + public: + Display() {}; + void turn_on(void); + void turn_off(void); +}; + +System rocket; +Display display; + +void Display::turn_off() +{ + TIMSK0 &= ~_BV(TOIE0); + PORTB = 0; + PORTD = 0; +} + +void Display::turn_on() +{ + TIMSK0 |= _BV(TOIE0); +} + +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 { + + // turn off display to indicate we're about to shut down + display.turn_off(); + + // 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.turn_on(); + + want_shutdown = 0; + } + } + else { + want_shutdown = 0; + } +} + +int main (void) +{ + // disable ADC to save power + PRR |= _BV(PRADC); + + // dito + wdt_disable(); + + // Ports B and D drive the dot matrix display -> set all as output + DDRB = 0xff; + DDRD = 0xff; + PORTB = 0; + PORTD = 0; + + // Enable pull-ups on PC3 and PC7 (button pins) + PORTC |= _BV(PC3) | _BV(PC7); + + // Enable 8bit counter with prescaler=8 (-> timer frequency = 1MHz) + TCCR0A = _BV(CS01); + // raise timer interrupt on counter overflow (-> interrupt frequency = ~4kHz) + TIMSK0 = _BV(TOIE0); + + disp[0] = font[8][1]; + disp[1] = font[8][2]; + disp[2] = font[8][3]; + disp[3] = font[8][4]; + disp[4] = font[8][5]; + disp[5] = font[8][6]; + disp[6] = font[8][7]; + disp[7] = font[8][8]; + +#if 0 + // smile! + disp[0] = 0x08; + disp[1] = 0x04; + disp[2] = 0x62; + disp[3] = 0x02; + disp[4] = 0x02; + disp[5] = 0x62; + disp[6] = 0x04; + disp[7] = 0x08; + disp[8] = 0x00; + disp[9] = 0x00; + disp[10] = 0x00; + disp[11] = 0x00; + disp[12] = 0x00; + disp[13] = 0x00; + disp[14] = 0x00; + disp[15] = 0x00; + disp[16] = 0x28; + disp[17] = 0x44; + disp[18] = 0x22; + disp[19] = 0x02; + disp[20] = 0x02; + disp[21] = 0x22; + disp[22] = 0x44; + disp[23] = 0x28; + disp[24] = 0x00; + disp[25] = 0x00; + disp[26] = 0x00; + disp[27] = 0x00; + disp[28] = 0x00; + disp[29] = 0x00; + disp[30] = 0x00; + disp[31] = 0x00; +#endif + + sei(); + + while (1) { + // nothing to do here, go to idle to save power + SMCR = _BV(SE); + asm("sleep"); + rocket.loop(); + } + + return 0; +} + +/* + * Draws a single display column. This function should be called at least once + * per millisecond. + * + * Current configuration: + * Called every 256 microseconds. The whole display is refreshed every 2048us, + * giving a refresh rate of ~500Hz + */ +ISR(TIMER0_OVF_vect) +{ + static uint8_t active_col = 0; + static uint16_t scroll = 0; + static uint8_t disp_offset = 0; + + static uint8_t disp_buf[8]; + + uint8_t i; + + if (++scroll == 512) { + scroll = 0; + if (++disp_offset == sizeof(disp)) { + disp_offset = 0; + } + + for (i = 0; i < 8; i++) { + disp_buf[i] = ~disp[(disp_offset + i) % sizeof(disp)]; + } + } + + /* + * To avoid flickering, do not put any code (or expensive index + * calculations) between the following three lines. + */ + PORTB = 0; + PORTD = disp_buf[active_col]; + PORTB = _BV(active_col); + + if (++active_col == 8) + active_col = 0; +} + +ISR(PCINT1_vect) +{ + // we use PCINT1 for wakeup, so we should catch it here (and do nothing) +} -- cgit v1.2.3