diff options
| author | Jacob McDonnell <jacob@jacobmcdonnell.com> | 2025-04-14 17:40:23 -0400 |
|---|---|---|
| committer | Jacob McDonnell <jacob@jacobmcdonnell.com> | 2025-04-14 17:40:23 -0400 |
| commit | e6f241df0461a3533ea28f9014f84d922e964728 (patch) | |
| tree | b59eb0cd784829807ca072ad8ceb187f355fe605 /cmpen472hw11_McDonnell/Sources/main.asm | |
| parent | 74dbec90535fa58a12366852d8cea73e7b9e0d65 (diff) | |
HW 11: Switched back to Channel 5 timer
Diffstat (limited to 'cmpen472hw11_McDonnell/Sources/main.asm')
| -rw-r--r-- | cmpen472hw11_McDonnell/Sources/main.asm | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/cmpen472hw11_McDonnell/Sources/main.asm b/cmpen472hw11_McDonnell/Sources/main.asm index ecfa67c..2aebd9d 100644 --- a/cmpen472hw11_McDonnell/Sources/main.asm +++ b/cmpen472hw11_McDonnell/Sources/main.asm @@ -66,7 +66,7 @@ TCNTH EQU $0044 ; Timer free runing main counter TSCR1 EQU $0046 ; Timer system control 1 TSCR2 EQU $004D ; Timer system control 2 TFLG1 EQU $004E ; Timer interrupt flag 1 -TC1H EQU $0052 ; Timer channel 1 register +TC5H EQU $005A ; Timer channel 5 register CR equ $0d ; carriage return, ASCII 'Return' key LF equ $0a ; line feed, ASCII 'next line' character @@ -132,10 +132,10 @@ waveType dc.b 'S' ; Used to track wave type 'T' for increa dc.w rtiisr ; Real Time Interrupt vector * ************************************************************************** -* Timer Interrupt Vector Section: address used [ $FFEC to $FFED ] RAM Memory +* Timer Interrupt Vector Section: address used [ $FFE4 to $FFE5 ] RAM Memory * - org $FFEC ; Timer channel 1 interrupt vector setup, on simulator - dc.w oc1isr + org $FFE4 ; Timer channel 5 interrupt vector setup, on simulator + dc.w oc5isr * ************************************************************************** * Program Section: address used [ $3100 to $3FFF ] RAM Memory @@ -248,7 +248,7 @@ rtidone jsr PrintTime ; Jump to PrintTime rtiSkip RTI ; Return from RTI ISR ;************************************************************************* -; oc1isr subroutine +; oc5isr subroutine ; ; This subroutine will set a flag after a set number of cycles. ; @@ -261,19 +261,19 @@ rtiSkip RTI ; Return from RTI ISR ; Comments: The timer will stop after outputCnt == numPoints ; -oc1isr ldd interval ; Load the interval for the next clock cycle - addd TC1H ; for next interrupt - std TC1H ; - bset TFLG1,%00100010 ; Clear CH1 interrupt flag +oc5isr ldd interval ; Load the interval for the next clock cycle + addd TC5H ; for next interrupt + std TC5H ; + bset TFLG1,%00100000 ; Clear CH5 interrupt flag ldaa #1 ; Load 1 into A staa timeTrigger ; Signal that timer went off ldd outputCnt ; Load the count of values outputed into D addd #1 ; Increase output count by 1 std outputCnt ; Update the count of outputted values cpd numPoints ; Compare D to numPoints - blo oc1Done ; If D < numPoints, Done - jsr StopTimerCH1 ; Stop Channel 1 Timer -oc1Done RTI ; Return from interrupt + blo oc5Done ; If D < numPoints, Done + jsr StopTimerCH5 ; Stop Channel 5 Timer +oc5Done RTI ; Return from interrupt ;************************************************************************* ; PrintWave subroutine @@ -396,9 +396,9 @@ DonePrint stab outputVal ; Store updated output value rts ; Return from Caller ;************************************************************************* -; StartTimer1oc subroutine +; StartTimer5oc subroutine ; -; This subroutine will enable & start the oc1 timer. +; This subroutine will enable & start the oc5 timer. ; ; Input: Interval to set the next clock cycle ; Output: No output other @@ -406,14 +406,14 @@ DonePrint stab outputVal ; Store updated output value ; Memory locations in use: All memory locations used for the oc5 timer. ; interval to set the next cycle. ; -; Comments: The timer will be enabled only on channel 1 for output compare. +; Comments: The timer will be enabled only on channel 5 for output compare. ; -StartTimer1oc +StartTimer5oc PSHD - LDAA #%00000010 - STAA TIOS ; set CH1 Output Compare - STAA TIE ; set CH1 interrupt Enable + LDAA #%00100000 + STAA TIOS ; set CH5 Output Compare + STAA TIE ; set CH5 interrupt Enable LDAA #%10000000 ; enable timer, Fast Flag Clear not set STAA TSCR1 LDAA #%00000000 ; TOI Off, TCRE Off, TCLK = BCLK/1 @@ -421,16 +421,16 @@ StartTimer1oc LDD interval ; 125usec with (24MHz/1 clock) ADDD TCNTH ; for first interrupt - STD TC1H ; + STD TC5H ; BSET TFLG1,%00000010 ; initial Timer CH5 interrupt flag Clear, not needed if fast clear set - LDAA #%00000010 - STAA TIE ; set CH1 interrupt Enable + LDAA #%00100000 + STAA TIE ; set CH5 interrupt Enable PULD RTS ;************************************************************************* -; StopTimerCH1 subroutine +; StopTimerCH5 subroutine ; ; This subroutine will stop and disable the timer. ; @@ -442,7 +442,7 @@ StartTimer1oc ; Comments: The timer will be disabled on all channels. ; -StopTimerCH1 +StopTimerCH5 psha ; Save A to the stack clra ; Clear A staa TIE ; Stop Timers @@ -472,7 +472,7 @@ GenWave std outputCnt ; Clear outputCnt staa outputVal ; Clear outputVal - jsr StartTimer1oc ; Start Timer on CH1 + jsr StartTimer5oc ; Start Timer on CH5 genLoop ldaa timeTrigger ; Load timeTrigger into A beq genLoop ; If A == 0, loop @@ -483,7 +483,7 @@ genLoop ldaa timeTrigger ; Load timeTrigger into A cpd numPoints ; Compare D to numPoints blo genLoop ; If D < numPoints, Loop - jsr StopTimerCH1 ; Turn off timer + jsr StopTimerCH5 ; Turn off timer puld ; Restore D from the stack rts ; Return |