Pio ASM cycle counter?

[Manjo80]

Hallo, I trying to understand Pio Asm and writing a code to use the hdq protocol on my pi pico.
I can't find a way how to use the regs as counter, to add 2 everytime to the reg X.

this tis the code I'm trying to write using https://wokwi.com/tools/pioasm

`.program hdq
.wrap_target
pull block
mov x, osr

set pindirs, 1 ; set pin as output
set pins, 1 [31] ; set pin low, wait 190 us
nop [5]
set pins, 0 [7] ; set pin high, wait 40 us

bitloop:
    jmp x-- bit_is_one
    set pins, 1 [17]
    set pins, 0 [19]
    jmp bitloop

bit_is_one:
    set pins, 1 [7]
    set pins, 0 [29]
    jmp bitloop

SET PINDIRS, 0 ; Set the pin direction to input

SET X, 2 ; Initialize the X and Y registers to 0/2
    
loop:
    WAIT PIN, 0 ; Wait for the pin to change state   
    ;MOV X,   ; add 2 to reg X
    JMP loop ; Jump back to the loop
  
MOV ISR, X
push block 
SET X, 2 ; Reset the X register to 2
    
JMP loop ; Jump back to the loop and start over`

Greeds

[mendenm]

The easy way to do this is to use
jmp(x_dec, "here1")
label("here")

which subtracts one from x. You can always complement x before returning it, which makes the subtract look like an add.