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>
ds3231
Maxim DS3231 RTC driver on libavr:
clock and alarm read/write, alarm interrupts, oscillator-stop detection,
die temperature. One source runs on every libavr chip — TWI hardware on
the mega328P, open-drain software I2C on the tinies. All bus errors
surface as std::expected.
using bus = dev::i2c<{.frequency = 100_kHz}>;
using rtc = ds3231::device<bus>;
auto now = rtc::read_clock(); // result<date_time>
(void)rtc::set_alarm1({}, ds3231::alarm1_rate::once_per_second);
example/main.cpp is the full tour. Build with a libavr checkout:
LIBAVR_ROOT=/path/to/libavr cmake --preset attiny85-generated
cmake --build --preset attiny85-generated
Presets cover attiny85/atmega328p in both libavr modes (generated and
reflect). The legacy yazoalfa-based driver lives on the master branch.
Differences from legacy: weekday-rate alarms now actually set the DY bit
(the old setAlarmHelper always cleared it), reads/writes are single
coherent bus transactions, and errors are reported instead of ignored.