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- /* STAR_momentary version 1.6
- *
- * Changelog
- *
- * 1.0 Initial version
- * 1.1 Added ability for star 2 to change mode order
- * 1.2 Fix for newer version of AVR Studio
- * 1.3 Added support for dual PWM outputs and selection of PWM mode per output level
- * 1.4 Added ability to switch to a momentary mode
- * 1.5 Added ability to set mode to 0 but not have it turn off
- * 1.6 Added ability to debounce the press
- *
- */
- /*
- * NANJG 105C Diagram
- * ---
- * -| |- VCC
- * Star 4 -| |- Voltage ADC
- * Star 3 -| |- PWM
- * GND -| |- Star 2
- * ---
- *
- * FUSES
- * I use these fuse settings
- * Low: 0x75 (4.8MHz CPU without 8x divider, 9.4kHz phase-correct PWM or 18.75kHz fast-PWM)
- * High: 0xff
- *
- * For more details on these settings, visit http://github.com/JCapSolutions/blf-firmware/wiki/PWM-Frequency
- *
- * STARS
- * Star 2 = Not used
- * Star 3 = H-L if connected, L-H if not
- * Star 4 = Switch input
- *
- * VOLTAGE
- * Resistor values for voltage divider (reference BLF-VLD README for more info)
- * Reference voltage can be anywhere from 1.0 to 1.2, so this cannot be all that accurate
- *
- * VCC
- * |
- * Vd (~.25 v drop from protection diode)
- * |
- * 1912 (R1 19,100 ohms)
- * |
- * |---- PB2 from MCU
- * |
- * 4701 (R2 4,700 ohms)
- * |
- * GND
- *
- * ADC = ((V_bat - V_diode) * R2 * 255) / ((R1 + R2 ) * V_ref)
- * 125 = ((3.0 - .25 ) * 4700 * 255) / ((19100 + 4700) * 1.1 )
- * 121 = ((2.9 - .25 ) * 4700 * 255) / ((19100 + 4700) * 1.1 )
- *
- * Well 125 and 121 were too close, so it shut off right after lowering to low mode, so I went with
- * 130 and 120
- *
- * To find out what value to use, plug in the target voltage (V) to this equation
- * value = (V * 4700 * 255) / (23800 * 1.1)
- *
- */
- #define F_CPU 4800000UL
- // PWM Mode
- #define PHASE 0b00000001
- #define FAST 0b00000011
- /*
- * =========================================================================
- * Settings to modify per driver
- */
- #define VOLTAGE_MON // Comment out to disable - ramp down and eventual shutoff when battery is low
- #define MODES 0,3,14,39,125,255,TURBO // Must be low to high, and must start with 0
- #define ALT_MODES 0,3,14,39,125,255,0 // Must be low to high, and must start with 0, the defines the level for the secondary output. Comment out if no secondary output
- #define MODE_PWM 0,PHASE,FAST,FAST,FAST,PHASE,PHASE // Define one per mode above. 0 tells the light to go to sleep
- #define TURBO 254 // Convenient define for the turbo level in MODES above.
- // full output with a step down after n number of seconds if TURBO_TIMEOUT is defined.
- // This is not defined to 255 so that value remains a valid PWM choice in MODES.
- #define TURBO_TIMEOUT 5625 // How many WTD ticks before before dropping down (.016 sec each)
- // 90 = 5625
- // 120 = 7500
- #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_ENTER_DUR 128 // .16ms each. Comment out to disable this feature
- #define MOM_EXIT_DUR 128 // .16ms each
- #define MOM_MODE_IDX 4 // The index of the mode to use in MODES above if momementary feature enabled, starting at index of 0
- /*
- * =========================================================================
- */
- #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 LOW_TO_HIGH 1 // If 1, will cycle L-H. If 0, H-L
- #define FET_PIN PB4
- #define SWITCH_PIN PB3 // what pin the switch is connected to, which is Star 4
- #define PWM_PIN PB1
- #define ALT_PWM_PIN PB0
- #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_LVL OCR0B // OCR0B is the output compare register for PB1
- #define ALT_PWM_LVL OCR0A // OCR0A is the output compare register for PB0
- //#define DEBOUNCE_BOTH // Comment out if you don't want to debounce the PRESS along with the RELEASE
- // PRESS debounce is only needed in special cases where the switch can experience errant signals
- #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
- // Switch handling
- #define LONG_PRESS_DUR 32 // How many WDT ticks until we consider a press a long press
- // 32 is roughly .5 s
- /*
- * The actual program
- * =========================================================================
- */
- /*
- * global variables
- */
- const uint8_t modes[] = { MODES };
- #ifdef ALT_MODES
- const uint8_t alt_modes[] = { ALT_MODES };
- #endif
- const uint8_t mode_pwm[] = { MODE_PWM };
- volatile uint8_t mode_idx = 0;
- volatile uint8_t press_duration = 0;
- volatile uint8_t in_momentary = 0;
- // Debounce switch press value
- #ifdef DEBOUNCE_BOTH
- int is_pressed()
- {
- static uint8_t pressed = 0;
- // 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);
- if (pressed) {
- // Need to look for a release indicator by seeing if the last switch status has been 0 for n number of polls
- pressed = (buffer & DB_REL_DUR);
- } else {
- // Need to look for pressed indicator by seeing if the last switch status was 1 for n number of polls
- pressed = ((buffer & DB_PRES_DUR) == DB_PRES_DUR);
- }
- return pressed;
- }
- #else
- 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);
- }
- #endif
- inline void next_mode() {
- if (++mode_idx >= sizeof(modes)) {
- // Wrap around
- mode_idx = 0;
- }
- }
- 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 :(
- // 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 press_duration = 0; // Pressed or not pressed
- static uint16_t turbo_ticks = 0;
- static uint8_t adc_ticks = ADC_DELAY;
- static uint8_t lowbatt_cnt = 0;
- if (is_pressed()) {
- if (press_duration < 255) {
- press_duration++;
- }
- #ifdef MOM_ENTER_DUR
- if (in_momentary) {
- // Turn on full output
- mode_idx = MOM_MODE_IDX;
- if (press_duration == MOM_EXIT_DUR) {
- // Turn light off and disable momentary
- mode_idx = 0;
- in_momentary = 0;
- }
- return;
- }
- #endif
- if (press_duration == LONG_PRESS_DUR) {
- // Long press
- if (LOW_TO_HIGH) {
- prev_mode();
- } else {
- next_mode();
- }
- }
- #ifdef MOM_ENTER_DUR
- if (press_duration == MOM_ENTER_DUR) {
- in_momentary = 1;
- press_duration = 0;
- }
- #endif
- // Just always reset turbo timer whenever the button is pressed
- turbo_ticks = 0;
- // Same with the ramp down delay
- adc_ticks = ADC_DELAY;
- } else {
- #ifdef MOM_ENTER_DUR
- if (in_momentary) {
- // Turn off the light
- mode_idx = 0;
- return;
- }
- #endif
- // Not pressed
- if (press_duration > 0 && press_duration < LONG_PRESS_DUR) {
- // Short press
- if (LOW_TO_HIGH) {
- next_mode();
- } else {
- prev_mode();
- }
- } else {
- // Only do turbo check when switch isn't pressed
- #ifdef TURBO_TIMEOUT
- if (modes[mode_idx] == TURBO) {
- turbo_ticks++;
- if (turbo_ticks > TURBO_TIMEOUT) {
- // Go to the previous mode
- prev_mode();
- }
- }
- #endif
- // 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 FET and PWM pin to output
- #ifdef ALT_MODES
- DDRB = (1 << FET_PIN) | (1 << PWM_PIN) | (1 << ALT_PWM_PIN);
- #else
- DDRB = (1 << FET_PIN) | (1 << PWM_PIN);
- #endif
- // 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
- // 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;
- 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) {
- // The WDT changed the mode.
- 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]) {
- #ifdef ALT_MODES
- TCCR0A = mode_pwm[mode_idx] | 0b10100000; // Use both outputs
- #else
- TCCR0A = mode_pwm[mode_idx] | 0b00100000; // Only use the normal output
- #endif
- }
- }
- if (modes[mode_idx] == TURBO)
- {
- // Turn on FET instead of main PWM.
- PORTB |= (1 << FET_PIN);
- PWM_LVL = 0;
- }
- else
- {
- // Turn off FET, use requested main PWM.
- PORTB &= ~(1 << FET_PIN);
- PWM_LVL = modes[mode_idx];
- }
- #ifdef ALT_MODES
- ALT_PWM_LVL = alt_modes[mode_idx];
- #endif
- last_mode_idx = mode_idx;
- if (mode_pwm[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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