BlackMark
ab78d94872
Same controller: thermistor on ADC0 averaged over 1000 free-running conversions, 50 kHz fan PWM on OC0B, 115200 Bd console with the full command set, EEPROM temperature histogram, watchdog-reset path into the boot section. The Steinhart-Hart math and the libm log are gone — the Beta equation and the cubic fan curve are consteval-evaluated into flash tables; the firmware never does floating point. Byte-identical .text in both libavr modes. Legacy stays on master. Co-Authored-By: Claude <noreply@anthropic.com>
23 lines
805 B
Markdown
23 lines
805 B
Markdown
# fantemp
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Temperature-controlled fan firmware (ATmega328P, 16 MHz), rewritten on
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[libavr](https://git.blackmark.me/avr/libavr): thermistor on ADC0 sampled
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free-running and averaged over 1000 conversions, fan on OC0B at 50 kHz,
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115200 Bd serial console (`help` lists the commands), temperature
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histogram persisted to EEPROM, watchdog-reset path into a boot-section
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bootloader.
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The Steinhart–Hart math of the legacy firmware (runtime doubles + libm
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log) is gone: the Beta equation and the cubic fan curve are evaluated
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consteval into flash tables — the firmware itself never touches floating
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point.
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Build against a libavr checkout:
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```sh
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LIBAVR_ROOT=/path/to/libavr cmake --preset atmega328p-generated
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cmake --build --preset atmega328p-generated
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```
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Legacy (yazoalfa submodules) stays on `master`.
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