sei() might be useful...

firmware/cup.c

@@ -73,7 +73,7 @@ ISR(PCINT0_vect)
 	input_state = new_state;
 }
 
-uint8_t control_output()
+inline uint8_t control_output(void)
 {
 	if (temperature > target)
 	{
@@ -86,7 +86,7 @@ uint8_t control_output()
 // Measure: 5V --- 10k --- --- PTY81-121 -- GND
 //                        |
 //                    uC ADC pin (with 1.11V reference)
-uint16_t linearize_temp(uint16_t temp_in)
+inline uint16_t linearize_temp(uint16_t temp_in)
 {
 	uint16_t temp_out = TARGET_TEMP_MAX; //burning
 	// made from datasheet by:
@@ -126,7 +126,7 @@ uint16_t linearize_temp(uint16_t temp_in)
 	return temp_out;
 }
 
-void io_init(void)
+inline void io_init(void)
 {
 	PORTA = (1 << TAST_PIN) | (1 << IMPULS1_PIN) | (1 << IMPULS0_PIN);/* enable pullups on inputs */
 	PORTB = 0;
@@ -135,14 +135,14 @@ void io_init(void)
 	input_state = PORTA & ((1 << IMPULS1_PIN) | (1 << IMPULS0_PIN) | (1 << TAST_PIN));
 }
 
-void led_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 */
 	OCR0A = OCR0B = led_color;
 }
 
-void led_set(uint16_t value)
+inline void led_set(uint16_t value)
 {
 	if (LED_GREEN_TEMP < value && value < LED_RED_TEMP) {
 		value = (value-LED_GREEN_TEMP) * 255/(LED_RED_TEMP-LED_GREEN_TEMP);
@@ -154,22 +154,22 @@ void led_set(uint16_t value)
 	OCR0A = OCR0B = (uint8_t)value;
 }
 
-void led_off(void)
+inline void led_off(void)
 {
 	OCR0A = 0;
 	OCR0B = 255;
 }
 
-void adc_init(void)
+inline void adc_init(void)
 {
 	ADMUX = (1 << REFS1) | (TEMP_PIN << MUX0);/* Vref = 1.1, pin selection */
 	ADCSRA = (1 << ADEN) | (1 << ADATE);/* adc enable, triggered */
 	ADCSRB = (1 << ADTS2);/* trigger on counter 0 overflow */
 	DIDR0 = (1 << TEMP_PIN);/* disable digital input on adc pin */
-	/* result in (ADCH << 8) | ADCL, accessable as ADC? */
+	/* result in (ADCH << 8) | ADCL, accessable as ADC */
 }
 
-void heat_init(void)
+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 */
@@ -177,7 +177,7 @@ void heat_init(void)
 	/* insert loading of heat setting here */
 }
 
-void input_init(void)
+inline void input_init(void)
 {
 	GIMSK = (1 << PCIE0);/* interrupt on change on PORT A */
 	PCMSK0 = (1 << TAST_PIN) | (1 << IMPULS1_PIN) | (1 << IMPULS0_PIN);
@@ -192,6 +192,7 @@ int main(void)
 	adc_init();
 	heat_init();
 	input_init();
+	sei();
 	
 	for(;;)
 	{