sxkbd

Firmware for RP2040-based corne split keyboard
git clone https://git.sinitax.com/sinitax/sxkbd
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ws2812.pio (455B)

      1.program ws2812
      2.side_set 1
      3
      4.define public T1 2
      5.define public T2 5
      6.define public T3 3
      7
      8.wrap_target
      9bitloop:
     10    out x, 1       side 0 [T3 - 1] ; Side-set still takes place when instruction stalls
     11    jmp !x do_zero side 1 [T1 - 1] ; Branch on the bit we shifted out. Positive pulse
     12do_one:
     13    jmp  bitloop   side 1 [T2 - 1] ; Continue driving high, for a long pulse
     14do_zero:
     15    nop            side 0 [T2 - 1] ; Or drive low, for a short pulse
     16.wrap