hardware initialisation

firmware/cup.c

@@ -0,0 +1,62 @@
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+
+#define TEMP_PIN 0
+#define IMPULS0_PIN 1
+#define IMPULS1_PIN 2
+#define TAST_PIN 3
+
+#define FET0_PIN 0
+#define FET1_PIN 1
+
+uint8_t led_color = 0;
+
+void io_init(void)
+{
+	PORTA = (1 << TAST_PIN) | (1 << IMPULS1_PIN) | (1 << IMPULS0_PIN);/* enable pullups on inputs */
+	PORTB = 0;
+	DDRA = (1 << OC0B);/* led outputs ... */
+	DDRB = (1 << OC0A) | (1 << FET0_PIN) | (1 << FET1_PIN);/* ... and FET output */
+}
+
+void led_init(void)
+{
+	TCCR0A = (1 << COM0A1) | (1 << COM0B1) | (1 << COM0B0) | (1 << WGM1) | (1 << WGM0);/* pwm enable: fast, A not inverted, B inverted */
+	TCCR0B = (1 << CS02) | (1 << CS00);/* prescaler / 1024 */
+	TCNT0 = 0;/* reset counter */
+	OCR0A = OCR0B = led_color;
+}
+
+void led_set(void)
+{
+	OCR0A = OCR0B = led_color;
+}
+
+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? */
+}
+
+void input_init(void)
+{
+	GIMSK = (1 << PCIE0);/* interrupt on change on PORT A */
+	PCMSK0 = (1 << TAST_PIN) | (1 << IMPULS1_PIN) | (1 << IMPULS0_PIN);
+}
+
+int main(void)
+{
+	/* if we store the last setting somewhere get calculate led_color from it before calling led_init() */
+	
+	io_init();
+	
+	led_init();
+	adc_init();
+	input_init();
+	
+	return 0;
+}