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* This is a copy of JonnyC/STAR_on-time_memory/STAR_1.1.c , modified only
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* slightly to shave off a few bytes. It has moon mode hard-coded as
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* "enabled" and turbo step-down disabled. This is because the original
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* firmware was compiling to a file bigger than 1024 bytes, and I wanted to
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* have something I could flash as a test. This provided my first working
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* self-flashed firmware, and is intended to help others to test their
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* toolchain and general flashing setup. Treat it like "hello world".
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* Original author: JonnyC
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* Size reduced by: ToyKeeper / Selene Scriven
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* Star 4 -| |- Voltage ADC
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* CPU speed is 4.8Mhz without the 8x divider when low fuse is 0x75
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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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* 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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* I use these fuse settings
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* Star 2 = Moon if connected
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* Star 3 = H-L if connected, L-H if not
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* Star 4 = Memory if not connected
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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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* Vd (~.25 v drop from protection diode)
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* 1912 (R1 19,100 ohms)
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* 4701 (R2 4,700 ohms)
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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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* 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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* 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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#define F_CPU 4800000UL
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* =========================================================================
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* Settings to modify per driver
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#define VOLTAGE_MON // Comment out to disable
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#define MODE_MOON 8 // Can comment out to remove mode, but should be set through soldering stars
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#define MODE_LOW 14 // Can comment out to remove mode
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#define MODE_MED 39 // Can comment out to remove mode
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#define MODE_HIGH_W_TURBO 110 // MODE_HIGH value when turbo is enabled
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#define MODE_HIGH 120 // Can comment out to remove mode
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//#define MODE_TURBO 255 // Can comment out to remove mode
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#define TURBO_TIMEOUT 240 // How many WTD ticks before before dropping down (.5 sec each)
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#define WDT_TIMEOUT 2 // Number of WTD ticks before mode is saved (.5 sec each)
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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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* =========================================================================
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#define MODE_HIGH MODE_HIGH_W_TURBO
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//#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include <avr/interrupt.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
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#define STAR3_PIN PB4
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#define STAR4_PIN PB3
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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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// Modes (gets set when the light starts up based on stars)
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static uint8_t modes[10]; // Don't need 10, but keeping it high enough to handle all
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volatile uint8_t mode_idx = 0;
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int mode_dir = 0; // 1 or -1. Determined when checking stars. Do we increase or decrease the idx when moving up to a higher mode.
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uint8_t mode_cnt = 0;
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uint8_t lowbatt_cnt = 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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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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inline void next_mode() {
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if (mode_idx == 0 && mode_dir == -1) {
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mode_idx = mode_cnt - 1;
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mode_idx += mode_dir;
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if (mode_idx > (mode_cnt - 1)) {
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inline void WDT_on() {
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// Setup watchdog timer to only interrupt, not reset, every 500ms.
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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) | (1<<WDP2) | (1<<WDP0); // Enable interrupt every 500ms
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sei(); // Enable interrupts
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inline void WDT_off()
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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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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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inline void ADC_off() {
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ADCSRA &= ~(1<<7); //ADC off
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uint8_t low_voltage(uint8_t voltage_val) {
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ADCSRA |= (1 << ADSC);
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// Wait for completion
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while (ADCSRA & (1 << ADSC));
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// See if voltage is lower than what we were looking for
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if (ADCH < voltage_val) {
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// See if it's been low for a while
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if (++lowbatt_cnt > 8) {
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static uint8_t ticks = 0;
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if (ticks < 255) ticks++;
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if (ticks == WDT_TIMEOUT) {
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store_mode_idx(mode_idx);
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// Reset the mode to the start for next time
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store_mode_idx((mode_dir == 1) ? 0 : (mode_cnt - 1));
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//} else if (ticks == TURBO_TIMEOUT && modes[mode_idx] == MODE_TURBO) { // Doesn't make any sense why this doesn't work
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} else if (ticks == TURBO_TIMEOUT && mode_idx == (mode_cnt - 1)) {
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// Turbo mode is always at end
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PWM_LVL = modes[--mode_idx];
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// All ports default to input, but turn pull-up resistors on for the stars (not the ADC input! Made that mistake already)
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PORTB = (1 << STAR2_PIN) | (1 << STAR3_PIN) | (1 << STAR4_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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ACSR |= (1<<7); //AC off
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// Load up the modes based on stars
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// Always load up the modes array in order of lowest to highest mode
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// 0 being low for soldered, 1 for pulled-up for not soldered
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/* if ((PINB & (1 << STAR2_PIN)) == 0) { */
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modes[mode_cnt++] = MODE_MOON;
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modes[mode_cnt++] = MODE_LOW;
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modes[mode_cnt++] = MODE_MED;
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modes[mode_cnt++] = MODE_HIGH;
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modes[mode_cnt++] = MODE_TURBO;
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if ((PINB & (1 << STAR3_PIN)) == 0) {
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// Not soldered (1) should enable memory
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//memory = ((PINB & (1 << STAR4_PIN)) > 0) ? 1 : 0;
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// Enable sleep mode set to Idle that will be triggered by the sleep_mode() command.
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// Will allow us to go idle between WDT interrupts
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set_sleep_mode(SLEEP_MODE_IDLE);
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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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// Indicates we did a short press last time, go to the next mode
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// Remove short press indicator first
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next_mode(); // Will handle wrap arounds
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// Didn't have a short press, keep the same mode
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// Store mode with short press indicator
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store_mode_idx(mode_idx|0x10);
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// Now just fire up the mode
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PWM_LVL = modes[mode_idx];
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if (low_voltage(ADC_LOW)) {
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// We need to go to a lower level
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if (mode_idx == 0 && PWM_LVL <= modes[mode_idx]) {
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// Can't go any lower than the lowest mode
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// Wait until we hit the critical level before flashing 10 times and turning off
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while (!low_voltage(ADC_CRIT));
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// Turn off the light
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// Disable WDT so it doesn't wake us up
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// Power down as many components as possible
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set_sleep_mode(SLEEP_MODE_PWR_DOWN);
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// Flash 3 times before lowering
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// Lower the mode by half, but don't go below lowest level
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if ((PWM_LVL >> 1) < modes[0]) {
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PWM_LVL = (PWM_LVL >> 1);
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// See if we should change the current mode level if we've gone under the current mode.
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if (PWM_LVL < modes[mode_idx]) {
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// Lower our recorded mode
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// Wait 3 seconds before lowering the level again
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return 0; // Standard Return Code
added
removed
hello_world/STAR_smaller.c
