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internal volt unit
Before this branch, `voltage` was 6 bits: Volts * 10
A couple patches ago, I upgraded it to 16 bits: 65535 * Volts / 10.24
That costs too much extra ROM on attiny85 though, for extra precision
it doesn't even use... so I switched back to an 8-bit value. It's still
more precise than before though: Volts * 40
... and battcheck displays an extra digit now, on devices with ROM for it.
... and battcheck waits a second to get a more accurate measurement
before displaying the first value. It has *much* less variation
between first and later readings now.
Also:
- got t1616 builds working again (tested fc13 and thefreeman-boost-fwaa)
- upgraded t1616 voltage and temp to 12-bit (10 bits + 4x oversampling)
- removed expensive temp conversion from t1616 ADC interrupt
- recalibrated t1616 bogomips again; runs faster after interrupt fix
- increased t1616 internal VDD measurement resolution by 36% (1.5V Vref, not 1.1V)
- fixed sloppy setting of Vref bits
I still need to test / update other t1616 builds,
and fix all the t85 + t1634 code and build targets.
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This patch changes the ADC code to use two internal standard units, and
everything else must convert to these units:
- FSM Volts: centiVolts << 6 (range 0 to 10.24 V per cell)
- FSM Kelvin: Kelvin << 6 (range 0 to 1024 K)
UI-level voltage is still "Volts * 10", and temperature is still Celsius.
FSM expects functions to be provided, to convert from the hardware's
raw ADC measurements to these internal units: `voltage_raw2cooked()`
and `temp_raw2cooked()`. Defaults will be provided by arch/*.[ch] for
each MCU type, or the hwdef can make its own.
Anyway, gotta go fix all the other MCUs and builds now. :(
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Phew, that's a lot of changes! And there's still a lot more to do...
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(just moved files, didn't change the contents yet,
and nothing will work without updating #includes and build scripts and stuff)
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