BlackMark
87e1f5e8a1
The register sugar now rides the bus's own master role - device<Bus> resolves avr::i2c::device<typename Bus::master, bus_address>, so a consumer keeps handing over its declared dev::i2c<...> unchanged - and the DS3231's hardwired 0x68 is a named constant. The example's four discards became the LED's own error signal (a failed seed or a failed alarm clear holds it dark, the same word a stuck bus says), the tree is reformatted under InsertBraces, the sources are ASCII, and the README's stale Studio byte counts are replaced by the claim its check-flags gate holds. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
38 lines
1.2 KiB
C++
38 lines
1.2 KiB
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). On first power-up the clock is seeded and
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// alarm 1 armed; then the LED mirrors the seconds parity - a stuck LED
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// means bus errors.
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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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// A failed seed leaves the LED dark before the loop ever runs - the
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// same signal a stuck bus gives it below.
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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(); // a clear that failed holds the LED dark, like any bus error
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}
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dev::delay<100_ms>();
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}
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}
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