diff options
| -rw-r--r-- | test.asm | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/test.asm b/test.asm new file mode 100644 index 0000000..7488c4c --- /dev/null +++ b/test.asm @@ -0,0 +1,169 @@ + xdef pgstart + absentry pgstart +* +******************************************************************************* +* Macros +* + +PORTB equ $0001 +DDRB equ $0003 + +SCHBDH equ $00C8 +SCHBDL equ $00C9 +SCICR2 equ $00CB +SCISR1 equ $00CC +SCIDRL equ $00CF + +CRGFLG equ $0037 +CRGINT equ $0038 +RTICTL equ $003B + +* +******************************************************************************* +* RTI Vector Section: [ $FFF0 to $FFF1 ] +* + + org $FFF0 + dc.w RTIISR + +* +******************************************************************************* +* Data Section: [ $3000 to $30FF ] +* + + org $3000 + +counter dc.w $0000 + +msg dc.b 'This program will print a $ every second',$00 + +numBuf ds.b $0002 + dc.b $00 + +inNumBuf dc.w $0000 + +* +******************************************************************************* +* Program Section: [ $3100 to $3FFF ] +* + org $3100 + +pgstart + lds #pgstart + + ldaa #1 + staa SCHBDH + + ldaa #$0C + staa SCICR2 + + ldaa #%00011001 + staa RTICTL + + bset CRGINT,#%10000000 + bset CRGFLG,#%10000000 + + ldx #msg + jsr printmsg + + cli + +loop jsr getchar + tsta + beq loop + jsr putchar + bra loop + +;****************************************************************************** +; Subroutine Section +; + +RTIISR bset CRGFLG,#%10000000 + ldx counter + inx + stx counter + cpx #400 + bne RTIDONE + ldx #0 + stx counter + ldaa #'$' + jsr putchar +RTIDONE rti + +getchar + brclr SCISR1,#%00100000,empty + ldaa SCIDRL + rts +empty clra + rts + +PrintTwoDigitDecimal + pshx + pshd + pshy + ldy #numBuf +ConvertLoop ldx #10 + idiv + cpd #0 + beq CheckX +XNotZero addb #'0' + stab 1,y+ + exg d,x + bra ConvertLoop +CheckX cpx #0 + bne XNotZero + ldx #numBuf + jsr printmsg + puly + puld + pulx + rts + +ReadTwoDigitDecimal + pshx + pshd + pshy + ldd #0 + ldab 1,x+ + beq ReadDone + cmpb #'0' + blt ReadDone + cmpb #'9' + bhi ReadDone + pshb + ldd inNumBuf + ldy #10 + emul + std inNumBuf + pulb + subb #'0' + ldy inNumBuf + aby + sty inNumBuf + bra ReadLoop +ReadDone puly + puld + pulx + rts + +putchar + brclr SCISR1,#%10000000,putchar + staa SCIDRL + rts + +printmsg + pshx + psha +printLoop ldaa 1,x+ + beq printDone + jsr putchar + bra printLoop +printDone pula + pulx + rts + +; +;****************************************************************************** + + end + |