WDT-based timing instead of ADC-based

This will allow us to use power-down sleep when neither ADC nor PWM
is used.

projects/step-up/adc.c

@@ -11,7 +11,7 @@
 #define NUM_ADCS	2
 
 volatile static unsigned char current_adc;;
-static unsigned char need_battery_adc;
+volatile unsigned char need_battery_adc;
 static uint16_t adc_sum, read_zero, drop_count, read_count, n_reads_log;
 volatile uint16_t jiffies;
 
@@ -126,30 +126,9 @@ void susp_adc()
 	DIDR0 = 0;
 }
 
-static void inline adc_based_timer()
-{
-	static unsigned char count;
-
-	if (++count < 40) // about 100 Hz jiffies
-		return;
-
-	count = 0;
-	++jiffies;
-
-	if ((jiffies & 0x007F) == 1) { // about every 1s
-		need_battery_adc = 1;
-	}
-	if ((jiffies & 0x0007) == 0) {
-		patterns_next_tick();
-	}
-	timer_check_buttons();
-}
-
 ISR(ADC_vect) { // IRQ handler
 	uint16_t adcval = ADCW;
 
-	adc_based_timer();
-
 	if (read_zero) {
 		setup_mux(current_adc);
 		read_zero = 0;

projects/step-up/buttons.c

@@ -7,9 +7,9 @@
 #include "lights.h"
 
 #define WAKEUP_LIMIT	5	// times 100 ms
-#define SHORT_PRESS_MIN	10	// in jiffies (100 Hz ticks)
-#define SHORT_PRESS_MAX 50
-#define LONG_PRESS_MIN	100
+#define SHORT_PRESS_MIN	2	// in jiffies (16 Hz ticks)
+#define SHORT_PRESS_MAX 5
+#define LONG_PRESS_MIN	10
 static uint16_t button_start;
 static unsigned char prev_state;
 
@@ -67,7 +67,7 @@ void timer_check_buttons()
 	} else if (!cur && prev) {            // --- just released ---
 		uint16_t duration = jiffies - button_start;
 
-		if (duration > SHORT_PRESS_MIN && duration < SHORT_PRESS_MAX) {
+		if (duration >= SHORT_PRESS_MIN && duration < SHORT_PRESS_MAX) {
 			short_press();
 		} else if (duration > LONG_PRESS_MIN) {
 			// set_status_led(button, NULL);

projects/step-up/lights.h

@@ -20,7 +20,7 @@ void inline log_word(uint16_t word) { }
 
 /* adc.c */
 #define PWMLED_ADC_SHIFT 1 /* 1<<1 measurements per single callback */
-extern volatile uint16_t jiffies;
+extern volatile unsigned char need_battery_adc;
 void init_adc();
 void susp_adc();
 
@@ -76,6 +76,7 @@ pattern_t *status_led_pattern_select();
 void set_error(unsigned char err);
 
 /* wdt.c */
+extern volatile uint16_t jiffies;
 void init_wdt();
 void susp_wdt();
 

projects/step-up/main.c

@@ -71,7 +71,6 @@ int main(void)
 	sei();
 #if 1
 	while (1) {
-		wdt_reset();
 		sleep_mode();
 	}
 #endif

projects/step-up/wdt.c

@@ -6,7 +6,8 @@
 
 void init_wdt()
 {
-	wdt_enable(WDTO_1S);
+	wdt_enable(WDTO_60MS);
+	WDTCR |= _BV(WDIE);
 }
 
 void susp_wdt()
@@ -14,3 +15,13 @@ void susp_wdt()
 	wdt_disable();
 }
 
+ISR(WDT_vect) {
+	++jiffies;
+
+	if (jiffies & 0x000F) {
+		need_battery_adc = 1; // about every 1s
+	}
+
+	patterns_next_tick();
+	timer_check_buttons();
+}