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firmware/cup.c

@@ -37,13 +37,27 @@ uint8_t heat_off[2] = {0, 0};
 uint8_t input_state = 0;
 uint8_t dev_state = 0;
 
+uint8_t startup = 1;
+uint8_t eeprom_write = 0;
+#define ONE_MINUTE 1536
+uint16_t eeprom_clk = ONE_MINUTE;
+
 /* gray code to change lookup table, index is old state .. new state */
 int8_t state_change[16] = {0, 1, -1, 0,  -1, 0, 0, 1,  1, 0, 0, -1,  0, -1, 1, 0};
+//int8_t state_change[16] = {0, -1, 1, 0,  1, 0, 0, -1,  -1, 0, 0, 1,  0, 1, -1, 0};
+
 
 ISR(TIM1_OVF_vect)
 {
 	/* timeout for displaying target temperature */
 	if(setting_timeout) {setting_timeout--;}
+	if(eeprom_clk) {eeprom_clk--;}
+	else
+	{
+		startup = 0;
+		eeprom_write = 1;
+		eeprom_clk = ONE_MINUTE;
+	}
 	
 	/* incremtening softpwm, toggling output if needed */
 	heat_pwm++;
@@ -139,7 +153,7 @@ inline void io_init(void)
 inline void led_init(void)
 {
 	TCCR0A = (1 << COM0A1) | (1 << COM0B1) | (1 << COM0B0) | (1 << WGM01) | (1 << WGM00);/* pwm enable: fast, A not inverted, B inverted */
-	TCCR0B = (1 << CS02) | (1 << CS00);/* prescaler / 1024 */
+	TCCR0B = (1 << CS00);/* prescaler / 1024 */
 	OCR0A = OCR0B = led_color;
 }
 
@@ -175,7 +189,15 @@ inline void heat_init(void)
 	TCCR1B = (1 << WGM12) | (1 << CS10);/* some mode allowing to set timer TOP, no prescaler */
 	TIMSK1 = (1 << TOIE1);/* interupt on overflow */
 	OCR1A = 39063;
-	/* insert loading of heat setting here */
+	
+	/* read eeprom */
+	while(EECR & (1 << EEPE)) {;}
+	EEAR = 0;
+	EECR = (1 << EERE);
+	target = EEDR << 8;
+	EEARL = 1;
+	EECR |= (1 << EERE);
+	target |= EEDR;
 }
 
 inline void input_init(void)
@@ -189,10 +211,10 @@ int main(void)
 	/* if we store the last setting somewhere calculate led_color from it before calling led_init() */
 	
 	io_init();
-	led_init();
 	adc_init();
 	heat_init();
 	input_init();
+	led_init();
 	sei();
 	
 	for(;;)
@@ -210,6 +232,7 @@ int main(void)
 				if(dev_state)
 				{
 					heat_output = control_output();
+					if(startup && heat_output > 192) {heat_output = 192;}
 					heat_on[0] = 0;
 					heat_on[1] = 128;
 					heat_off[0] = heat_output;
@@ -225,6 +248,23 @@ int main(void)
 		if(!dev_state) {led_off();}
 		else if(setting_timeout) {led_set(target);}
 		else {led_set(temperature);}
+		
+		if(eeprom_write && dev_state)
+		{
+			while(EECR & (1 << EEPE)) {;}
+			EEARL = 0;
+			EEDR = (target >> 8) & 0xff;
+			EECR |= (1 << EEMPE);
+			EECR |= (1 << EEPE);
+			
+			while(EECR & (1 << EEPE)) {;}
+			EEARL = 1;
+			EEDR = target & 0xff;
+			EECR |= (1 << EEMPE);
+			EECR |= (1 << EEPE);
+			
+			eeprom_write = 0;
+		}
 	}
 	
 	return 0;