39 lines
1021 B
C++
39 lines
1021 B
C++
#include <RocketScream_LowPowerAVRZero.h>
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#include <RocketScream_RTCAVRZero.h>
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/* Example on a 32-pin ATMega4808, LED on pin D7, using internal ULP OSC32K */
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const uint8_t unusedPins[] = {0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13,
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14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25};
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void setup()
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{
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uint8_t index;
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for (index = 0; index < sizeof(unusedPins); index++)
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{
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pinMode(unusedPins[index], INPUT_PULLUP);
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LowPower.disablePinISC(unusedPins[index]);
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}
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite(LED_BUILTIN, LOW);
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/* true: external 32.768 kHz crystal */
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/* false: internal 32.768 kHz ULP oscillator */
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RTCAVRZero.begin(false);
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/* Time in seconds, true: repeat, false: once */
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RTCAVRZero.enableAlarm(5, true);
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RTCAVRZero.attachInterrupt(toggle);
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}
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void loop()
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{
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/* RTC works down to standby mode only. In power down, PIT is required */
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LowPower.standby();
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}
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void toggle(void)
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{
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digitalWrite(LED_BUILTIN, CHANGE);
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}
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