avr/ds3231
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build: the libavr pin advances past phase 6, and the driver takes the bus whole

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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>
This commit is contained in:
BlackMark
2026-08-09 11:46:10 +02:00
parent 2909d0bc6c
commit 87e1f5e8a1
6 changed files with 60 additions and 34 deletions
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19
example/main.cpp
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@@ -5,7 +5,7 @@ using namespace avr::literals;
// One source for the tiny85 (open-drain software I2C on the USI pins) and
// the mega328P (TWI hardware). On first power-up the clock is seeded and
// alarm 1 armed; then the LED mirrors the seconds parity — a stuck LED
// alarm 1 armed; then the LED mirrors the seconds parity - a stuck LED
// means bus errors.
using dev = avr::device<{.clock = 8_MHz}>;
using bus = dev::i2c<{.frequency = 100_kHz}>;
@@ -17,16 +17,21 @@ int main()
avr::init<bus, led>();
if (auto stopped = rtc::oscillator_stopped(); stopped.value_or(false)) {
(void)rtc::write_clock({{2026, 1, 1}, {12, 0, 0}});
(void)rtc::set_alarm1({}, ds3231::alarm1_rate::once_per_second);
(void)rtc::clear_oscillator_stopped();
// A failed seed leaves the LED dark before the loop ever runs - the
// same signal a stuck bus gives it below.
const bool seeded = rtc::write_clock({{2026, 1, 1}, {12, 0, 0}}) &&
rtc::set_alarm1({}, ds3231::alarm1_rate::once_per_second) &&
rtc::clear_oscillator_stopped();
led::write(seeded);
}
while (true) {
if (auto now = rtc::read_clock(); now.has_value())
if (auto now = rtc::read_clock(); now.has_value()) {
led::write(now->second % 2 == 0);
if (auto fired = rtc::alarm1_fired(); fired.value_or(false))
(void)rtc::clear_alarm1();
}
if (auto fired = rtc::alarm1_fired(); fired.value_or(false) && !rtc::clear_alarm1()) {
led::clear(); // a clear that failed holds the LED dark, like any bus error
}
dev::delay<100_ms>();
}
}