~toykeeper/flashlight-firmware/trunk : revision 2

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/*

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* NANJG 105C Diagram

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* ---

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* -| |- VCC

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* Star 4 -| |- Voltage ADC

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* Star 3 -| |- PWM

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* GND -| |- Star 2

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* ---

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* CPU speed is 4.8Mhz without the 8x divider when low fuse is 0x75

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*

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* define F_CPU 4800000 CPU: 4.8MHz PWM: 9.4kHz ####### use low fuse: 0x75 #######

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* /8 PWM: 1.176kHz ####### use low fuse: 0x65 #######

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* define F_CPU 9600000 CPU: 9.6MHz PWM: 19kHz ####### use low fuse: 0x7a #######

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* /8 PWM: 2.4kHz ####### use low fuse: 0x6a #######

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*

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* Above PWM speeds are for phase-correct PWM. This program uses Fast-PWM, which when the CPU is 4.8MHz will be 18.75 kHz

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*

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* FUSES

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* I use these fuse settings

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* Low: 0x75

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* High: 0xff

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*

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* STARS

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* Star 2 = H-L if connected, L-H if not

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* Star 3 = Memory if not connected

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* Star 4 = Input for switch

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*

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* VOLTAGE

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* Resistor values for voltage divider (reference BLF-VLD README for more info)

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* Reference voltage can be anywhere from 1.0 to 1.2, so this cannot be all that accurate

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*

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* VCC

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* |

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* Vd (~.25 v drop from protection diode)

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* |

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* 1912 (R1 19,100 ohms)

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* |

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* |---- PB2 from MCU

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* |

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* 4701 (R2 4,700 ohms)

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* |

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* GND

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*

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* ADC = ((V_bat - V_diode) * R2 * 255) / ((R1 + R2 ) * V_ref)

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* 125 = ((3.0 - .25 ) * 4700 * 255) / ((19100 + 4700) * 1.1 )

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* 121 = ((2.9 - .25 ) * 4700 * 255) / ((19100 + 4700) * 1.1 )

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*

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* Well 125 and 121 were too close, so it shut off right after lowering to low mode, so I went with

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* 130 and 120

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*

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* To find out what value to use, plug in the target voltage (V) to this equation

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* value = (V * 4700 * 255) / (23800 * 1.1)

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*

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*

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* v1.0 - Initial try, there's bound to be bugs

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*/

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#define F_CPU 4800000UL

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/*

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* =========================================================================

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* Settings to modify per driver

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*/

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#define VOLTAGE_MON // Comment out to disable - ramp down and eventual shutoff when battery is low

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#define MODES 16,32,125,255 // Must be low to high, star determines which way we cycle through them

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#define TURBO // Comment out to disable - full output with a step down after n number of seconds

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// If turbo is enabled, it will be where 255 is listed in the modes above

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#define TURBO_TIMEOUT 5625 // How many WTD ticks before before dropping down (.016 sec each)

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// 90 = 5625

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// 120 = 7500

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#define ADC_LOW 130 // When do we start ramping

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#define ADC_CRIT 120 // When do we shut the light off

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#define ADC_DELAY 188 // Delay in ticks between low-bat rampdowns (188 ~= 3s)

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/*

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* =========================================================================

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*/

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#include <avr/pgmspace.h>

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#include <avr/io.h>

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#include <util/delay.h>

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#include <avr/interrupt.h>

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#include <avr/wdt.h>

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#include <avr/eeprom.h>

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#include <avr/sleep.h>

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//#include <avr/power.h>

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#define STAR2_PIN PB0 // If not connected, will cycle L-H. Connected, H-L

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#define STAR3_PIN PB4 // If not connected, will enable memory

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#define SWITCH_PIN PB3 // what pin the switch is connected to, which is Star 4

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#define PWM_PIN PB1

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#define VOLTAGE_PIN PB2

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#define ADC_CHANNEL 0x01 // MUX 01 corresponds with PB2

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#define ADC_DIDR ADC1D // Digital input disable bit corresponding with PB2

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#define ADC_PRSCL 0x06 // clk/64

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#define PWM_LVL OCR0B // OCR0B is the output compare register for PB1

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#define DB_REL_DUR 0b00001111 // time before we consider the switch released after

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// each bit of 1 from the right equals 16ms, so 0x0f = 64ms

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// Switch handling

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#define LONG_PRESS_DUR 32 // How many WDT ticks until we consider a press a long press

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// 32 is roughly .5 s

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/*

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* The actual program

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* =========================================================================

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*/

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/*

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* global variables

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*/

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PROGMEM uint8_t modes[] = { MODES };

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volatile uint8_t mode_idx = 0;

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volatile uint8_t press_duration = 0;

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volatile uint8_t low_to_high = 0;

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// Mode storage

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uint8_t eepos = 0;

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uint8_t eep[32];

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uint8_t memory = 0;

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void store_mode_idx(uint8_t lvl) { //central method for writing (with wear leveling)

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uint8_t oldpos=eepos;

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eepos=(eepos+1)&31; //wear leveling, use next cell

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// Write the current mode

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EEARL=eepos; EEDR=lvl; EECR=32+4; EECR=32+4+2; //WRITE //32:write only (no erase) 4:enable 2:go

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while(EECR & 2); //wait for completion

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// Erase the last mode

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EEARL=oldpos; EECR=16+4; EECR=16+4+2; //ERASE //16:erase only (no write) 4:enable 2:go

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}

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inline void read_mode_idx() {

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eeprom_read_block(&eep, 0, 32);

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while((eep[eepos] == 0xff) && (eepos < 32)) eepos++;

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if (eepos < 32) mode_idx = eep[eepos];//&0x10; What the?

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else eepos=0;

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}

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// Debounced switch press value

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int is_pressed()

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{

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// Keep track of last switch values polled

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static uint8_t buffer = 0x00;

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// Shift over and tack on the latest value, 0 being low for pressed, 1 for pulled-up for released

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buffer = (buffer << 1) | ((PINB & (1 << SWITCH_PIN)) == 0);

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return (buffer & DB_REL_DUR);

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}

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void next_mode(uint8_t save) {

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if (++mode_idx >= sizeof(modes)) {

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// Wrap around

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mode_idx = 0;

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}

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if (memory && save) {

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store_mode_idx(mode_idx);

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}

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}

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void prev_mode(uint8_t save) {

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if (mode_idx == 0) {

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// Wrap around

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mode_idx = sizeof(modes) - 1;

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} else {

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--mode_idx;

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}

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if (memory && save) {

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store_mode_idx(mode_idx);

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}

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}

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/*

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inline void PCINT_on() {

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// Enable pin change interrupts

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GIMSK |= (1 << PCIE);

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}

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inline void PCINT_off() {

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// Disable pin change interrupts

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GIMSK &= ~(1 << PCIE);

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}

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*/

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// Need an interrupt for when pin change is enabled to ONLY wake us from sleep.

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// All logic of what to do when we wake up will be handled in the main loop.

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EMPTY_INTERRUPT(PCINT0_vect);

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inline void WDT_on() {

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// Setup watchdog timer to only interrupt, not reset, every 16ms.

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cli(); // Disable interrupts

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wdt_reset(); // Reset the WDT

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WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence

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WDTCR = (1<<WDTIE); // Enable interrupt every 16ms

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sei(); // Enable interrupts

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}

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/*

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inline void WDT_off()

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{

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cli(); // Disable interrupts

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wdt_reset(); // Reset the WDT

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MCUSR &= ~(1<<WDRF); // Clear Watchdog reset flag

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WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence

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WDTCR = 0x00; // Disable WDT

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sei(); // Enable interrupts

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}

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*/

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inline void ADC_on() {

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ADMUX = (1 << REFS0) | (1 << ADLAR) | ADC_CHANNEL; // 1.1v reference, left-adjust, ADC1/PB2

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DIDR0 |= (1 << ADC_DIDR); // disable digital input on ADC pin to reduce power consumption

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ADCSRA = (1 << ADEN ) | (1 << ADSC ) | ADC_PRSCL; // enable, start, prescale

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}

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inline void ADC_off() {

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ADCSRA &= ~(1<<7); //ADC off

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}

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/*

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void sleep_until_switch_press()

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{

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// This routine takes up a lot of program memory :(

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// Turn the WDT off so it doesn't wake us from sleep

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// Will also ensure interrupts are on or we will never wake up

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WDT_off();

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// Need to reset press duration since a button release wasn't recorded

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press_duration = 0;

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// Enable a pin change interrupt to wake us up

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// However, we have to make sure the switch is released otherwise we will wake when the user releases the switch

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while (is_pressed()) {

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_delay_ms(16);

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}

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PCINT_on();

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// Enable sleep mode set to Power Down that will be triggered by the sleep_mode() command.

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//set_sleep_mode(SLEEP_MODE_PWR_DOWN);

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// Now go to sleep

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sleep_mode();

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// Hey, someone must have pressed the switch!!

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// Disable pin change interrupt because it's only used to wake us up

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PCINT_off();

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// Turn the WDT back on to check for switch presses

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WDT_on();

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// Go back to main program

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}

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*/

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// The watchdog timer is called every 16ms

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ISR(WDT_vect) {

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//static uint8_t press_duration = 0; // Pressed or not pressed

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static uint16_t turbo_ticks = 0;

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static uint8_t adc_ticks = ADC_DELAY;

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static uint8_t lowbatt_cnt = 0;

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if (is_pressed()) {

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if (press_duration < 255) {

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press_duration++;

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}

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if (press_duration == LONG_PRESS_DUR) {

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// Long press

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if (low_to_high) {

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prev_mode(1);

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} else {

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next_mode(1);

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}

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}

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// Just always reset turbo timer whenever the button is pressed

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turbo_ticks = 0;

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// Same with the ramp down delay

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adc_ticks = ADC_DELAY;

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} else {

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// Not pressed

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if (press_duration > 0 && press_duration < LONG_PRESS_DUR) {

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// Short press

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if (low_to_high) {

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next_mode(1);

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} else {

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prev_mode(1);

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}

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} else {

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// Only do turbo check when switch isn't pressed

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#ifdef TURBO

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if (pgm_read_byte(&modes[mode_idx]) == 255) {

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turbo_ticks++;

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if (turbo_ticks > TURBO_TIMEOUT) {

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// Go to the previous mode

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prev_mode(0);

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}

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}

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#endif

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// Only do voltage monitoring when the switch isn't pressed and we aren't at the lowest level

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#ifdef VOLTAGE_MON

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if (mode_idx > 0) {

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if (adc_ticks > 0) {

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--adc_ticks;

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}

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if (adc_ticks == 0) {

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// See if conversion is done

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if (ADCSRA & (1 << ADIF)) {

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// See if voltage is lower than what we were looking for

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if (ADCH < ((mode_idx == 1) ? ADC_CRIT : ADC_LOW)) {

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++lowbatt_cnt;

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} else {

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lowbatt_cnt = 0;

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}

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}

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// See if it's been low for a while

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if (lowbatt_cnt >= 4) {

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prev_mode(0);

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lowbatt_cnt = 0;

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// Restart the counter to when we step down again

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adc_ticks = ADC_DELAY;

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}

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// Make sure conversion is running for next time through

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ADCSRA |= (1 << ADSC);

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}

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}

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#endif

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}

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press_duration = 0;

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}

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}

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int main(void)

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{

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// Set all ports to input, and turn pull-up resistors on for the inputs we are using

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DDRB = 0x00;

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PORTB = (1 << SWITCH_PIN) | (1 << STAR2_PIN) | (1 << STAR3_PIN);

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// Set the switch as an interrupt for when we turn pin change interrupts on

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PCMSK = (1 << SWITCH_PIN);

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// Set PWM pin to output

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DDRB = (1 << PWM_PIN);

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// Set timer to do PWM for correct output pin and set prescaler timing

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TCCR0A = 0x23; // phase corrected PWM is 0x21 for PB1, fast-PWM is 0x23

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TCCR0B = 0x01; // pre-scaler for timer (1 => 1, 2 => 8, 3 => 64...)

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// Turn features on or off as needed

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#ifdef VOLTAGE_MON

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ADC_on();

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#else

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ADC_off();

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#endif

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ACSR |= (1<<7); //AC off

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// Determine if we are going L-H, or H-L based on STAR 2

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if ((PINB & (1 << STAR2_PIN)) == 0) {

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// High to Low

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low_to_high = 0;

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} else {

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low_to_high = 1;

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}

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// Not soldered (1) should enable memory

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memory = ((PINB & (1 << STAR3_PIN)) > 0) ? 1 : 0;

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// Don't think we want to ever go to sleep

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// Enable sleep mode set to Power Down that will be triggered by the sleep_mode() command.

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//set_sleep_mode(SLEEP_MODE_PWR_DOWN);

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//sleep_until_switch_press();

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WDT_on();

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// Determine what mode we should fire up

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// Read the last mode that was saved

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if (memory) {

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read_mode_idx();

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} else {

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if (low_to_high) {

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mode_idx = 0;

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} else {

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mode_idx = sizeof(modes);

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}

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}

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PWM_LVL = pgm_read_byte(&modes[mode_idx]);

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uint8_t last_mode_idx = mode_idx;

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while(1) {

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// We will never leave this loop. The WDT will interrupt to check for switch presses and

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// will change the mode if needed. If this loop detects that the mode has changed, run the

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// logic for that mode while continuing to check for a mode change.

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if (mode_idx != last_mode_idx) {

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// Save the new mode

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last_mode_idx = mode_idx;

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// The WDT changed the mode.

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PWM_LVL = pgm_read_byte(&modes[mode_idx]);

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}

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}

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return 0; // Standard Return Code

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}

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