basic FS commands

spybug/sys.cpp

@@ -0,0 +1,35 @@
+// Copyright 2022 Darwin Schuppan <darwin@nobrain.org>
+// SPDX license identifier: MIT
+
+#include "sys.hh"
+
+static volatile bool wdt_int_sleep_mode = false;
+ISR (WDT_vect) {
+	if (wdt_int_sleep_mode)
+		wdt_disable();
+	else
+		full_reset();
+}
+
+/* Based on https://github.com/rocketscream/Low-Power. */
+void low_power_sleep_minutes(unsigned long t) {
+	wdt_int_sleep_mode = true;
+	ADCSRA &= ~_BV(ADEN); /* Disable ADC. */
+	for (unsigned long i = 0; 8ul * i < 60ul * t; i++) {
+		// Power Down for 8s
+		wdt_enable(WDTO_8S);   /* Start watchdog timer for 8s. */
+		WDTCSR |= (1 << WDIE); /* Enable watchdog interrupt. */
+		do {
+			set_sleep_mode(SLEEP_MODE_PWR_DOWN);
+			cli();
+			sleep_enable();
+			sleep_bod_disable();
+			sei();
+			sleep_cpu();
+			sleep_disable();
+			sei();
+		} while (0);
+	}
+	ADCSRA |= _BV(ADEN); /* Re-enable ADC. */
+	wdt_int_sleep_mode = false;
+}