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board, hwconfig: Set POWER_EN in early boot #43

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matthias merged 1 commits from fix-set-power-en-in-early-boot into main 2025-10-14 21:09:07 +00:00
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matthias commented 2025-10-13 21:23:44 +00:00
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In order to turn the Tonberry device on more reliably even if the power
button is only pressed for a short time, move the setting of POWER_EN
pin to high from the python board_init to the MICROPY_BOARD_STARTUP
macro so that is is started in the C startup code run before the
micropython interpreter is initialized.

Measured time from power on to POWER_EN time was 600-800 ms with the
python board_init, vs. 155 ms for the MICROPY_BOARD_STARTUP.

In order to turn the Tonberry device on more reliably even if the power button is only pressed for a short time, move the setting of POWER_EN pin to high from the python board_init to the MICROPY_BOARD_STARTUP macro so that is is started in the C startup code run before the micropython interpreter is initialized. Measured time from power on to POWER_EN time was 600-800 ms with the python board_init, vs. 155 ms for the MICROPY_BOARD_STARTUP.
matthias self-assigned this 2025-10-13 21:23:44 +00:00
matthias added 1 commit 2025-10-13 21:23:45 +00:00
board, hwconfig: Set POWER_EN in early boot
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902ce980af 
In order to turn the Tonberry device on more reliably even if the power
button is only pressed for a short time, move the setting of POWER_EN
pin to high from the python board_init to the MICROPY_BOARD_STARTUP
macro so that is is started in the C startup code run before the
micropython interpreter is initialized.

Measured time from power on to POWER_EN time was 600-800 ms with the
python board_init, vs. 155 ms for the MICROPY_BOARD_STARTUP.

Signed-off-by: Matthias Blankertz <matthias@blankertz.org>
matthias requested review from stefank 2025-10-13 21:23:45 +00:00
stefank commented 2025-10-14 20:00:28 +00:00
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I'm a bit surprised that it still takes so long until that macro is actually called 🤔

I'm a bit surprised that it still takes so long until that macro is actually called 🤔
stefank approved these changes 2025-10-14 20:00:37 +00:00
matthias commented 2025-10-14 21:08:43 +00:00
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I'm a bit surprised that it still takes so long until that macro is actually called 🤔

According to my research, this is because the time it takes to copy stuff from flash to ram (.data and the code we run from ram) in crt0 before we even get to main().

> I'm a bit surprised that it still takes so long until that macro is actually called 🤔 According to my research, this is because the time it takes to copy stuff from flash to ram (.data and the code we run from ram) in crt0 before we even get to main().
matthias merged commit 231172f794 into main 2025-10-14 21:09:07 +00:00
matthias deleted branch fix-set-power-en-in-early-boot 2025-10-14 21:09:07 +00:00
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Reference: TonBERRY/tonberry-pico#43
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