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- #define F_CPU 4800000UL
- #define PHASE 0b00000001
- #define FAST 0b00000011
- #define BLINK_ON_POWER
- #define VOLTAGE_MON
- #define MODES 0,4,10,120,255
- #define MODE_PWM 0,PHASE,FAST,FAST,PHASE
- #define ADC_LOW 130 // When do we start ramping
- #define ADC_CRIT 120 // When do we shut the light off
- #define ADC_DELAY 188 // Delay in ticks between low-bat rampdowns (188 ~= 3s)
- #define MOM_EXIT_DUR 128 // .16ms each
- #define FULL_MODE -1
- /*
- * =========================================================================
- */
- #include <avr/pgmspace.h>
- #include <avr/io.h>
- #include <util/delay.h>
- #include <avr/interrupt.h>
- #include <avr/wdt.h>
- #include <avr/eeprom.h>
- #include <avr/sleep.h>
- //#include <avr/power.h>
- #define SWITCH_PIN PB3 // what pin the switch is connected to, which is Star 4
- #define PWM_PIN PB1
- #define VOLTAGE_PIN PB2
- #define ADC_CHANNEL 0x01 // MUX 01 corresponds with PB2
- #define ADC_DIDR ADC1D // Digital input disable bit corresponding with PB2
- #define ADC_PRSCL 0x06 // clk/64
- #define PWM_LVL1 OCR0B // OCR0B is the output compare register for PB1
- #define DB_PRES_DUR 0b00000001 // time before we consider the switch pressed (after first realizing it was pressed)
- #define DB_REL_DUR 0b00001111 // time before we consider the switch released
- // each bit of 1 from the right equals 16ms, so 0x0f = 64ms
- #define LONG_PRESS_DUR 128 // How many WDT ticks until we consider a press a long press // 32 is roughly .5 s
- #define LOCK_PRESS_DUR 300
- const uint8_t modes[] = { MODES };
- const uint8_t mode_pwm[] = { MODE_PWM };
- volatile int8_t mode_idx = 0;
- volatile uint8_t press_duration = 0;
- volatile uint8_t low_to_high = 1;
- volatile uint8_t locked = 0;
- volatile uint8_t in_momentary = 0;
- int8_t real_mode_idx = 0;
- int is_pressed()
- {
- // Keep track of last switch values polled
- static uint8_t buffer = 0x00;
- // Shift over and tack on the latest value, 0 being low for pressed, 1 for pulled-up for released
- buffer = (buffer << 1) | ((PINB & (1 << SWITCH_PIN)) == 0);
- return (buffer & DB_REL_DUR);
- }
- inline void next_mode() {
- if (++mode_idx >= sizeof(modes)) {
- // Wrap around
- mode_idx = 1;
- }
- }
- inline void prev_mode() {
- if (mode_idx == 0 ) {
- // Wrap around
- mode_idx = sizeof(modes) - 1;
- } else {
- --mode_idx;
- }
- }
- inline void PCINT_on() {
- // Enable pin change interrupts
- GIMSK |= (1 << PCIE);
- }
- inline void PCINT_off() {
- // Disable pin change interrupts
- GIMSK &= ~(1 << PCIE);
- }
- // Need an interrupt for when pin change is enabled to ONLY wake us from sleep.
- // All logic of what to do when we wake up will be handled in the main loop.
- EMPTY_INTERRUPT(PCINT0_vect);
- inline void WDT_on() {
- // Setup watchdog timer to only interrupt, not reset, every 16ms.
- cli(); // Disable interrupts
- wdt_reset(); // Reset the WDT
- WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence
- WDTCR = (1<<WDTIE); // Enable interrupt every 16ms
- sei(); // Enable interrupts
- }
- inline void WDT_off()
- {
- cli(); // Disable interrupts
- wdt_reset(); // Reset the WDT
- MCUSR &= ~(1<<WDRF); // Clear Watchdog reset flag
- WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence
- WDTCR = 0x00; // Disable WDT
- sei(); // Enable interrupts
- }
- inline void ADC_on() {
- ADMUX = (1 << REFS0) | (1 << ADLAR) | ADC_CHANNEL; // 1.1v reference, left-adjust, ADC1/PB2
- DIDR0 |= (1 << ADC_DIDR); // disable digital input on ADC pin to reduce power consumption
- ADCSRA = (1 << ADEN ) | (1 << ADSC ) | ADC_PRSCL; // enable, start, prescale
- }
- inline void ADC_off() {
- ADCSRA &= ~(1<<7); //ADC off
- }
- void sleep_until_switch_press()
- {
- // This routine takes up a lot of program memory Sad
- // Turn the WDT off so it doesn't wake us from sleep
- // Will also ensure interrupts are on or we will never wake up
- WDT_off();
- // Need to reset press duration since a button release wasn't recorded
- press_duration = 0;
- // Enable a pin change interrupt to wake us up
- // However, we have to make sure the switch is released otherwise we will wake when the user releases the switch
- while (is_pressed()) {
- _delay_ms(16);
- }
- PCINT_on();
- // Enable sleep mode set to Power Down that will be triggered by the sleep_mode() command.
- //set_sleep_mode(SLEEP_MODE_PWR_DOWN);
- // Now go to sleep
- sleep_mode();
- // Hey, someone must have pressed the switch!!
- // Disable pin change interrupt because it's only used to wake us up
- PCINT_off();
- // Turn the WDT back on to check for switch presses
- WDT_on();
- // Go back to main program
- }
- // The watchdog timer is called every 16ms
- ISR(WDT_vect) {
- static uint8_t adc_ticks = ADC_DELAY;
- static uint8_t lowbatt_cnt = 0;
- if (is_pressed()) {
- if (press_duration < 255) {
- press_duration++;
- }
- if (press_duration == LONG_PRESS_DUR) {
- // Long press
- if (mode_idx == 0 ) {
- // TODO: if we were off, enter strobe mode
- mode_idx = 4;
- } else {
- // if we were on, turn off
- mode_idx = 0;
- }
- }
- // Just always reset turbo timer whenever the button is pressed
- //turbo_ticks = 0;
- // Same with the ramp down delay
- adc_ticks = ADC_DELAY;
- } else {
- if (press_duration == LOCK_PRESS_DUR) {
- locked ^= 1;
- if (locked)
- {
- mode_idx = 0;
- }
- else
- {
- real_mode_idx = mode_idx;
- }
- }
- if (locked) { // don't do anything if the lock-out is active
- press_duration = 0;
- return;
- }
- // Not pressed
- if (press_duration > 0 && press_duration < LONG_PRESS_DUR) {
- // Short press
- if (mode_idx == 4) {
- // short-press from strobe goes to second-highest mode
- mode_idx = sizeof(modes)-4;
- }
- else { // regular short press
- if (low_to_high) {
- next_mode();
- }
- }
- // Not pressed
- if (locked) { // don't do anything if the lock-out is active
- press_duration = 0;
- return;
- }
- // Only do voltage monitoring when the switch isn't pressed
- #ifdef VOLTAGE_MON
- if (adc_ticks > 0 ) {
- --adc_ticks;
- }
- if (adc_ticks == 0 ) {
- // See if conversion is done
- if (ADCSRA & (1 << ADIF)) {
- // See if voltage is lower than what we were looking for
- if (ADCH < ((mode_idx == 1) ? ADC_CRIT : ADC_LOW)) {
- ++lowbatt_cnt;
- } else {
- lowbatt_cnt = 0;
- }
- }
- // See if it's been low for a while
- if (lowbatt_cnt >= 4) {
- prev_mode();
- lowbatt_cnt = 0;
- // If we reach 0 here, main loop will go into sleep mode
- // Restart the counter to when we step down again
- adc_ticks = ADC_DELAY;
- }
- // Make sure conversion is running for next time through
- ADCSRA |= (1 << ADSC);
- }
- #endif
- }
- press_duration = 0;
- }
- }
- int main(void)
- {
- // Set all ports to input, and turn pull-up resistors on for the inputs we are using
- DDRB = 0x00;
- PORTB = (1 << SWITCH_PIN);
- // Set the switch as an interrupt for when we turn pin change interrupts on
- PCMSK = (1 << SWITCH_PIN);
- // Set PWM pin to output
- DDRB = (1 << PWM_PIN);
- // Set timer to do PWM for correct output pin and set prescaler timing
- TCCR0A = 0x23; // phase corrected PWM is 0x21 for PB1, fast-PWM is 0x23
- TCCR0B = 0x01; // pre-scaler for timer (1 => 1, 2 => 8, 3 => 64...)
- // Turn features on or off as needed
- #ifdef VOLTAGE_MON
- ADC_on();
- #else
- ADC_off();
- #endif
- ACSR |= (1<<7); //AC off
- #ifdef BLINK_ON_POWER
- // blink once to let the user know we have power
- TCCR0A = PHASE | 0b00100000; // Only use the normal output
- PWM_LVL1 = 60;
- _delay_ms(3);
- PWM_LVL1 = 0;
- _delay_ms(1);
- #endif
- // Enable sleep mode set to Power Down that will be triggered by the sleep_mode() command.
- set_sleep_mode(SLEEP_MODE_PWR_DOWN);
- sleep_until_switch_press();
- uint8_t last_mode_idx = 0;
- int8_t real_mode_idx = 0;
- while(1) {
- // We will never leave this loop. The WDT will interrupt to check for switch presses and
- // will change the mode if needed. If this loop detects that the mode has changed, run the
- // logic for that mode while continuing to check for a mode change.
- if (mode_idx != last_mode_idx) {
- real_mode_idx = mode_idx;
- // The WDT changed the mode.
- if (mode_idx == FULL_MODE) {
- // strobe should use second-highest mode
- real_mode_idx = sizeof(modes) - 4;
- } else if (mode_idx > 0 ) {
- // No need to change the mode if we are just turning the light off
- // Check if the PWM mode is different
- if (mode_pwm[last_mode_idx] != mode_pwm[mode_idx]) {
- TCCR0A = mode_pwm[mode_idx] | 0b10100000; // Use both outputs
- }
- }
- PWM_LVL1 = modes[real_mode_idx];
- last_mode_idx = mode_idx;
- // Handle strobe mode
- if (mode_idx == FULL_MODE) {
- PWM_LVL1=255;
- TCCR0A=PHASE | 0b00100000;
- }
- if (real_mode_idx == 0 ) {
- _delay_ms(1); // Need this here, maybe instructions for PWM output not getting executed before shutdown?
- // Go to sleep
- sleep_until_switch_press();
- }
- }
- }
- return 0; // Standard Return Code
- }
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