6
* 1.1 Cleaned up the code
7
* 1.2 Added support for dual PWM outputs and selection of PWM mode per output level
8
* 1.3 Added ability to have turbo ramp down gradually instead of step down
16
* Star 4 -| |- Voltage ADC
22
* I use these fuse settings
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* Low: 0x75 (4.8MHz CPU without 8x divider, 9.4kHz phase-correct PWM or 18.75kHz fast-PWM)
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* For more details on these settings, visit http://github.com/JCapSolutions/blf-firmware/wiki/PWM-Frequency
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* Star 2 = Moon if connected and alternate PWM output not used
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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 TICKS_250MS // If enabled, ticks are every 250 ms. If disabled, ticks are every 500 ms
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// Affects mode saving and turbo timeout/rampdown timing
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#define LVP_MIN 7 // Lowest level the LVP will step down to
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//#define MODE_MOON 3 // 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 255 // 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 MODE_TURBO_LOW 140 // Level turbo ramps down to if turbo enabled
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#define TURBO_TIMEOUT 240 // How many WTD ticks before before dropping down. If ticks set for 500 ms, then 240 x .5 = 120 seconds. Max value of 255 unless you change "ticks"
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// variable to uint8_t
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#define TURBO_RAMP_DOWN // By default we will start to gradually ramp down, once TURBO_TIMEOUT ticks are reached, 1 PWM_LVL each tick until reaching MODE_TURBO_LOW PWM_LVL
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// If commented out, we will step down to MODE_TURBO_LOW once TURBO_TIMEOUT ticks are reached
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#define FAST_PWM_START 8 // Above what output level should we switch from phase correct to fast-PWM?
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//#define DUAL_PWM_START 8 // Above what output level should we switch from the alternate PWM output to both PWM outputs? Comment out to disable alternate PWM output
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#define WDT_TIMEOUT 2 // Number of WTD ticks before mode is saved
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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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//#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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#define ALT_PWM_LVL OCR0A // OCR0A is the output compare register for PB0
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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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#if 0 // memory is irrelevant for 1 mode
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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
140
while(EECR & 2); //wait for completion
141
// Erase the last mode
142
EEARL=oldpos; EECR=16+4; EECR=16+4+2; //ERASE //16:erase only (no write) 4:enable 2:go
144
inline void read_mode_idx() {
145
eeprom_read_block(&eep, 0, 32);
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while((eep[eepos] == 0xff) && (eepos < 32)) eepos++;
147
if (eepos < 32) mode_idx = eep[eepos];//&0x10; What the?
151
inline void next_mode() {
152
if (mode_idx == 0 && mode_dir == -1) {
154
mode_idx = mode_cnt - 1;
156
mode_idx += mode_dir;
157
if (mode_idx > (mode_cnt - 1)) {
163
#endif // memory/modes are irrelevant for 1 mode
165
inline void WDT_on() {
166
// Setup watchdog timer to only interrupt, not reset
167
cli(); // Disable interrupts
168
wdt_reset(); // Reset the WDT
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WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence
171
WDTCR = (1<<WDTIE) | (1<<WDP2); // Enable interrupt every 250ms
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WDTCR = (1<<WDTIE) | (1<<WDP2) | (1<<WDP0); // Enable interrupt every 500ms
175
sei(); // Enable interrupts
178
inline void WDT_off()
180
cli(); // Disable interrupts
181
wdt_reset(); // Reset the WDT
182
MCUSR &= ~(1<<WDRF); // Clear Watchdog reset flag
183
WDTCR |= (1<<WDCE) | (1<<WDE); // Start timed sequence
184
WDTCR = 0x00; // Disable WDT
185
sei(); // Enable interrupts
188
inline void ADC_on() {
189
ADMUX = (1 << REFS0) | (1 << ADLAR) | ADC_CHANNEL; // 1.1v reference, left-adjust, ADC1/PB2
190
DIDR0 |= (1 << ADC_DIDR); // disable digital input on ADC pin to reduce power consumption
191
ADCSRA = (1 << ADEN ) | (1 << ADSC ) | ADC_PRSCL; // enable, start, prescale
194
inline void ADC_off() {
195
ADCSRA &= ~(1<<7); //ADC off
198
void set_output(uint8_t pwm_lvl) {
199
#ifdef DUAL_PWM_START
200
if (pwm_lvl > DUAL_PWM_START) {
201
// Using the normal output along with the alternate
209
// Always set alternate PWM value even if not compiled for dual output as we will use this value
210
// throughout the code when trying to see what the current output level is. Setting this wont affect
211
// the output when alternate output is disabled.
212
ALT_PWM_LVL = pwm_lvl;
216
uint8_t low_voltage(uint8_t voltage_val) {
218
ADCSRA |= (1 << ADSC);
219
// Wait for completion
220
while (ADCSRA & (1 << ADSC));
221
// See if voltage is lower than what we were looking for
222
if (ADCH < voltage_val) {
223
// See if it's been low for a while
224
if (++lowbatt_cnt > 8) {
236
static uint8_t ticks = 0;
237
if (ticks < 255) ticks++;
238
// If you want more than 255 for longer turbo timeouts
239
//static uint16_t ticks = 0;
240
//if (ticks < 60000) ticks++;
242
#if 0 // memory is irrelevant with only one mode
243
if (ticks == WDT_TIMEOUT) {
245
store_mode_idx(mode_idx);
247
// Reset the mode to the start for next time
248
store_mode_idx((mode_dir == 1) ? 0 : (mode_cnt - 1));
253
//if (ticks == TURBO_TIMEOUT && modes[mode_idx] == MODE_TURBO) { // Doesn't make any sense why this doesn't work
254
if (ticks >= TURBO_TIMEOUT && mode_idx == (mode_cnt - 1) && PWM_LVL > MODE_TURBO_LOW) {
255
#ifdef TURBO_RAMP_DOWN
256
set_output(PWM_LVL - 1);
258
// Turbo mode is always at end
259
set_output(MODE_TURBO_LOW);
260
//store_mode_idx(mode_idx);
271
// All ports default to input, but turn pull-up resistors on for the stars (not the ADC input! Made that mistake already)
272
#ifdef DUAL_PWM_START
273
PORTB = (1 << STAR3_PIN) | (1 << STAR4_PIN);
275
PORTB = (1 << STAR2_PIN) | (1 << STAR3_PIN) | (1 << STAR4_PIN);
278
// Set PWM pin to output
279
#ifdef DUAL_PWM_START
280
DDRB = (1 << PWM_PIN) | (1 << STAR2_PIN);
282
DDRB = (1 << PWM_PIN);
285
// Turn features on or off as needed
291
ACSR |= (1<<7); //AC off
293
// Load up the modes based on stars
294
// Always load up the modes array in order of lowest to highest mode
295
// 0 being low for soldered, 1 for pulled-up for not soldered
298
#ifndef DUAL_PWM_START
299
if ((PINB & (1 << STAR2_PIN)) == 0) {
301
modes[mode_cnt++] = MODE_MOON;
302
#ifndef DUAL_PWM_START
307
modes[mode_cnt++] = MODE_LOW;
310
modes[mode_cnt++] = MODE_MED;
313
modes[mode_cnt++] = MODE_HIGH;
316
modes[mode_cnt++] = MODE_TURBO;
318
#if 0 // stars are irrelevant for just one mode
319
if ((PINB & (1 << STAR3_PIN)) == 0) {
325
// Not soldered (1) should enable memory
326
memory = ((PINB & (1 << STAR4_PIN)) > 0) ? 1 : 0;
329
// Enable sleep mode set to Idle that will be triggered by the sleep_mode() command.
330
// Will allow us to go idle between WDT interrupts
331
set_sleep_mode(SLEEP_MODE_IDLE);
333
// Determine what mode we should fire up
334
#if 0 // memory is irrelevant with only one mode
335
// Read the last mode that was saved
338
// Indicates we did a short press last time, go to the next mode
339
// Remove short press indicator first
341
next_mode(); // Will handle wrap arounds
343
// Didn't have a short press, keep the same mode
345
// Store mode with short press indicator
346
store_mode_idx(mode_idx|0x10);
351
// Now just fire up the mode
353
// Set timer to do PWM for correct output pin and set prescaler timing
354
if (modes[mode_idx] > FAST_PWM_START) {
355
#ifdef DUAL_PWM_START
356
TCCR0A = 0b10100011; // fast-PWM both outputs
358
TCCR0A = 0b00100011; // fast-PWM normal output
361
#ifdef DUAL_PWM_START
362
TCCR0A = 0b10100001; // phase corrected PWM both outputs
364
TCCR0A = 0b00100001; // phase corrected PWM normal output
367
TCCR0B = 0x01; // pre-scaler for timer (1 => 1, 2 => 8, 3 => 64...)
369
set_output(modes[mode_idx]);
375
if (low_voltage(ADC_LOW)) {
376
// We need to go to a lower level
377
if ((mode_idx == 0) && (ALT_PWM_LVL <= LVP_MIN)) {
378
// Can't go any lower than the lowest mode
379
// Wait until we hit the critical level before flashing 10 times and turning off
380
while (!low_voltage(ADC_CRIT));
388
// Turn off the light
390
// Disable WDT so it doesn't wake us up
392
// Power down as many components as possible
393
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
396
// Flash 3 times before lowering
397
hold_pwm = ALT_PWM_LVL;
402
set_output(hold_pwm);
405
// Lower the mode by half, but don't go below LVP_MIN
406
if ((ALT_PWM_LVL >> 1) > LVP_MIN) {
407
set_output(ALT_PWM_LVL >> 1);
411
// See if we should change the current mode level if we've gone under the current mode.
412
if ((mode_idx > 0) && (ALT_PWM_LVL < modes[mode_idx])) {
413
// Lower our recorded mode
417
// Wait 3 seconds before lowering the level again
424
return 0; // Standard Return Code
added
removed
ToyKeeper/STAR_1mode/STAR_1mode.c
