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Misc fixes #107

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Misc fixes #107

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Commits on Nov 28, 2023

  1. Move PIO init code to its own file 

    Embedding C code into pio assembly files makes for a poor editing
experience.
    @9ary
    9ary committed Nov 28, 2023
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  2. Remove debug pin

    @9ary
    9ary committed Nov 28, 2023
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  3. Remove bit duplication hack 

    Increasing the output drive strength is enough, no need to output to
multiple pins at all.
    @9ary
    9ary committed Nov 28, 2023
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  4. Fix bit shift error 

    EXI is basically SPI mode 0.
In particular, this means CPHA=0, i.e. the first bit comes out *before*
the first clock pulse.
    @9ary
    9ary committed Nov 28, 2023
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  5. Implement split payload

    @9ary
    9ary committed Nov 28, 2023
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  6. Clean up pin configuration 

    This makes it easier to customize the pinout.
    @9ary
    9ary committed Nov 28, 2023
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Commits on Dec 6, 2023

  1. Merge iplboot into final UF2

    @9ary
    9ary committed Dec 6, 2023
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