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
      4 start:
      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
      9 bitloop:
     10     in      pins, 1
     11     jmp     x--, bitloop                [6]
     12 
     13     jmp     pin, outb                           ; got STOP bit, output byte
     14 
     15 error:
     16     irq     wait 0                              ; no STOP bit,
     17     wait    1 pin, 0                            ; set err IRQ and await reset
     18     jmp start
     19 
     20 outb:
     21     push    block
     22 .wrap