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Misc fixes #107

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Misc fixes #107

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9ary
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@9ary 9ary commented Nov 28, 2023

This PR supersedes #105. It includes misc cleanups, fixes two implementation bugs, and decouples the payload from picoboot.

Fixes #22
Fixes #58

Embedding C code into pio assembly files makes for a poor editing
experience.
Increasing the output drive strength is enough, no need to output to
multiple pins at all.
EXI is basically SPI mode 0.
In particular, this means CPHA=0, i.e. the first bit comes out *before*
the first clock pulse.
This makes it easier to customize the pinout.
@9ary 9ary force-pushed the for-upstream branch 3 times, most recently from 5e0c1fc to 89c0990 Compare November 30, 2023 11:13
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Separate modchip code from the payload IPL binary processing
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