diff options
Diffstat (limited to 'cmpen472hw10_McDonnell')
| -rw-r--r-- | cmpen472hw10_McDonnell/Sources/main.asm | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/cmpen472hw10_McDonnell/Sources/main.asm b/cmpen472hw10_McDonnell/Sources/main.asm index 245ce86..48b407b 100644 --- a/cmpen472hw10_McDonnell/Sources/main.asm +++ b/cmpen472hw10_McDonnell/Sources/main.asm @@ -101,7 +101,9 @@ outputCnt dc.w $0000 ; Used to track how many values have bee interval dc.w $3000 ; Used to set the timer module based on clock cycles waveType dc.b 'S' ; Used to track wave type 'T' for increasing triangle, - ; 't' for decreasing triangle, 'Q' for square + ; 't' for decreasing triangle, + ; 'Q' for square high + ; 'q' for square low ; 'S' for sawtooth * @@ -264,7 +266,9 @@ PrintWave cmpa #'t' ; Compare A to 't' beq TriangleDec ; If A == 't', triangle wave decreasing cmpa #'Q' ; Compare A to 'Q' - beq SquareWave ; If A == 'Q', square wave + beq SquareWaveH ; If A == 'Q', square wave high + cmpa #'q' ; Compare A to 'q' + beq SquareWaveL ; If A == 'q', square wave low SawToothWav clra ; Clear A ldab outputVal ; Load the output value into B jsr PrintDecimalWord; Print the lower byte of the output value; @@ -273,14 +277,27 @@ SawToothWav clra ; Clear A bne DonePrint ; If D != 256, Done clrb ; Reset to Zero bra DonePrint ; Branch to DonePrint -SquareWave clra ; Clear A +SquareWaveH clra ; Clear A + ldab #255 ; Load 255 into B + jsr PrintDecimalWord; Print the lower byte of the output value; ldab outputVal ; Load the output value into B + addb #1 ; Add 1 to B + cmpb #255 ; Compare B to 255 + bnq DonePrint ; If B != 255, done + clrb ; Reset B to zero + ldaa #'q' ; Load 'q' into A + staa waveType ; Update wave type to square wave low + bra DonePrint ; Branch to DonePrint +SquareWaveL clra ; Clear A + clrb ; Reset B to zero jsr PrintDecimalWord; Print the lower byte of the output value; + ldab outputVal ; Load the output value into B + addb #1 ; Add 1 to B cmpb #255 ; Compare B to 255 - beq SquareIsHi ; If B == 255, branch to SquareIsHi - ldab #255 ; Load 255 into B - bra DonePrint ; Branch always to DonePrint -SquareIsHi clrb ; Reset B to zero + bnq DonePrint ; If B != 255, done + clrb ; Reset B to zero + ldaa #'Q' ; Load 'Q' into A + staa waveType ; Update wave type to square wave low bra DonePrint ; Branch to DonePrint TriangleInc clra ; Clear A ldab outputVal ; Load the output value into B |