WIP: on-demand sleep modes

This does not compile yet, to be fixed.

projects/step-up/lights.h

@@ -21,11 +21,13 @@ void inline log_word(uint16_t word) { }
 /* adc.c */
 #define PWMLED_ADC_SHIFT 1 /* 1<<1 measurements per single callback */
 extern volatile unsigned char need_battery_adc;
+extern volatile unsigned char adc_running;
 void init_adc();
 void susp_adc();
 
 /* pwm.c */
 #define PWM_MAX 0xFF
+extern volatile unsigned char pwm_running;
 void init_pwm();
 void susp_pwm();
 void pwm_off();

projects/step-up/main.c

@@ -71,7 +71,18 @@ int main(void)
 	sei();
 #if 1
 	while (1) {
-		sleep_mode();
+		cli();
+		if (pwm_running) {
+			set_sleep_mode(SLEEP_MODE_IDLE);
+		} else if (adc_running) {
+			set_sleep_mode(SLEEP_MODE_ADC);
+		} else {
+			set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+		}
+		// keep BOD active, no sleep_bod_disable();
+		sei();
+		sleep_cpu();
+		sleep_disable();
 	}
 #endif