BlackMarkandClaude Opus 5.5
081f2e74cd
The comment on the failed alarm clear claimed it holds the LED dark; the next clock read rewrites the LED a tenth of a second later. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
34 lines
953 B
C++
34 lines
953 B
C++
#include <ds3231/ds3231.hpp>
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#include <libavr/libavr.hpp>
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using namespace avr::literals;
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// One source for the tiny85 (open-drain software I2C on the USI pins) and
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// the mega328P (TWI hardware).
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using dev = avr::device<{.clock = 8_MHz}>;
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using bus = dev::i2c<{.frequency = 100_kHz}>;
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using rtc = ds3231::device<bus>;
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using led = dev::output<avr::pb3>;
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int main()
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{
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avr::init<bus, led>();
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if (auto stopped = rtc::oscillator_stopped(); stopped.value_or(false)) {
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const bool seeded = rtc::write_clock({{2026, 1, 1}, {12, 0, 0}}) &&
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rtc::set_alarm1({}, ds3231::alarm1_rate::once_per_second) &&
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rtc::clear_oscillator_stopped();
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led::write(seeded);
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}
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while (true) {
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if (auto now = rtc::read_clock(); now.has_value()) {
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led::write(now->second % 2 == 0);
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}
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if (auto fired = rtc::alarm1_fired(); fired.value_or(false) && !rtc::clear_alarm1()) {
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led::clear();
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}
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dev::delay<100_ms>();
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}
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}
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