sxkbd

Firmware for RP2040-based corne split keyboard
git clone https://git.sinitax.com/sinitax/sxkbd
Log | Files | Refs | Submodules | README | LICENSE | sfeed.txt

uart_rx.pio (606B)

      1.program uart_rx
      2
      3.wrap_target
      4start:
      5    wait    0 pin, 0                    [6]     ; wait for START bit
      6
      7    set     x, 7                        [4]     ; read 8 DATA bits and offset
      8                                                ; clock for better readings
      9bitloop:
     10    in      pins, 1
     11    jmp     x--, bitloop                [6]
     12
     13    jmp     pin, outb                           ; got STOP bit, output byte
     14
     15error:
     16    irq     wait 0                              ; no STOP bit,
     17    wait    1 pin, 0                            ; set err IRQ and await reset
     18    jmp start
     19
     20outb:
     21    push    block
     22.wrap