BlackMark
cdca5219d0
Same driver surface as the yazoalfa version — clock and alarm get/set, alarm interrupts, flag check/clear — plus oscillator-stop detection and die temperature. One source for tiny85 (software I2C) and mega328P (TWI), built against libavr in both generated and reflect mode, byte-identical .text across modes. Errors surface as std::expected instead of being dropped; weekday-rate alarms now really set the DY bit (legacy cleared it); multi-register access is one coherent bus transaction. Legacy stays on master. Co-Authored-By: Claude <noreply@anthropic.com>
33 lines
999 B
C++
33 lines
999 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). 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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(void)rtc::write_clock({{2026, 1, 1}, {12, 0, 0}});
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(void)rtc::set_alarm1({}, ds3231::alarm1_rate::once_per_second);
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(void)rtc::clear_oscillator_stopped();
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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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if (auto fired = rtc::alarm1_fired(); fired.value_or(false))
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(void)rtc::clear_alarm1();
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dev::delay<100_ms>();
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}
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}
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