Check for 3.3V supply before raising IRQ and continuing boot process #72
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jannic
commented
Jan 28, 2025
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|
Nice catch, thanks! |
thejpster
reviewed
Jan 28, 2025
neotron-bmc-pico/src/main.rs
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| if ctx.shared.state_dc_power_enabled.lock(|r| *r) == DcPowerState::Starting { | ||
| let mon_3v3 = ctx.local.adc.read_abs_mv(ctx.local.pin_3v3_monitor); | ||
| defmt::trace!("3v3 reading: {}", mon_3v3); | ||
| if mon_3v3 < 1600 { |
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Why 1600mV? That seems quite low?
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There is a voltage divider before the ADC. 1600mV on the pin means 3.2V on the 3.3V rail.
So 1600mV may actually be too high. I didn't do an estimate of the tolerances.
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(If you agree with the general approach, I can work on the details, like adding some explanations, putting the "magic value" 1600 in a const etc.)
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Ahhhh. Yes, you can't exceed fairly tight limits on the ADC pin so I halved the input.
Yes the approach makes sense.
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This tested OK. @jannic can you rebase on main to pick up some fixes? I was unable to push to your fork. |
thejpster
approved these changes
Mar 16, 2025
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Signals:
1: 3.3V
2: 5V
4: IRQ0
Before:
With this fix:
