Problem using ASM instruction

[mister_e]

Well there's a few mistake in your code anyways...

First, you check for a High level for your push-button... fine, but you enable the internal pull-up... thus this 'should' always consider that there's one push button pressed.

Next, you never loop in your code.. there's on missing GOTO LOOP.. this results in stack underflow.

Assuming your push button are connected between, gnd and the I/O and GND, using the internal weak-pull-ups, i would bet the following will work

        @ DEVICE PIC12F675, XT_OSC
        @ DEVICE pic12F675, WDT_ON 
        @ DEVICE pic12F675, PWRT_ON
        @ DEVICE pic12F675, MCLR_OFF 
        @ DEVICE pic12F675, BOD_ON
        
        DEFINE OSC 3
        
        TRISIO.0 = 0 ' set GPIO.0 as output
        TRISIO.1 = 1 ' set GPIO.0 as input
        TRISIO.2 = 1 ' set GPIO.0 as input
        
        CMCON = 7 ' turn off analog comparator
        ADCON0.0 = 0
        ADCON0.1 = 0
        ADCON0.2 = 0
        OPTION_REG.7 = 0
        VRCON = 0
        ANSEL = 0
        
        '// Setup IR bit widths / carrier cycle times     
        Header  CON 96    '// Header = (96 * 25uS) = 2.4mS burst
        Zero    CON 24    '// Zero = (24 * 25uS) = 0.6mS burst
        One     CON 48    '// One = (48 * 25uS) = 1.2mS burst
        
        '// Define variables
        Cycles   VAR BYTE BANK0    '// Holds number of 40KHz carrier cycles
        i        var byte

Loop:
        if gpio.1 = 0 then
           cycles = header
           gosub pulse
           cycles = zero
           gosub dark
        
           cycles = zero
           gosub pulse
           cycles = zero
           gosub dark
        endif
        
        if gpio.2 = 0 then
           cycles = header
           gosub pulse
           cycles = zero
           gosub dark
        
           cycles = one
           gosub pulse
        
        endif
        
        GOTO LOOP

Pulse:                '// Emits # of 38.461 kHz bursts held in variable Cycles
    for i = 1 to cycles
        ASM                   ;// with auto delay between bursts
           ;bsf GPIO, 0         ;// 1uS, LED=on [need 25uS total
           MOVE?CT 1, GPIO,0
           goto $+1           ;// 3uS (2uS per goto $+1)
           goto $+1           ;// 5uS
           goto $+1           ;// 7uS
           goto $+1           ;// 9uS
           goto $+1           ;// 11uS
           goto $+1           ;// 13uS 
           bcf GPIO, 0        ;// 14uS, LED=off
           decfsz _Cycles,F   ;// 24uS
           goto $+1           ;// 16uS
           goto $+1           ;// 18uS
           goto $+1           ;// 20uS
           goto $+1           ;// 22uS
        ENDASM   
    next i

return
   
Dark:
    for i = 1 to cycles
        ASM                   ;// with auto delay between bursts
           ;bcf GPIO, 0         ;// 1uS, LED=on [need 25uS total
           MOVE?CT 0,GPIO,0
           goto $+1           ;// 3uS (2uS per goto $+1)
           goto $+1           ;// 5uS
           goto $+1           ;// 7uS
           goto $+1           ;// 9uS
           goto $+1           ;// 11uS
           goto $+1           ;// 13uS 
           goto $+1           ;// 13uS 
           goto $+1           ;// 13uS 
           goto $+1           ;// 16uS
           goto $+1           ;// 18uS
           goto $+1           ;// 20uS
           goto $+1           ;// 20uS
        ENDASM   
    next i

return

I may feel some incoming timing problem(s)