Mercurial > repos > simple16
comparison timer.s16 @ 25:fb14515266f4
Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Thu, 31 Mar 2016 23:25:52 -0700 |
| parents | |
| children | cb078b3b23e8 |
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| 24:4c9dbfa30a66 | 25:fb14515266f4 |
|---|---|
| 1 ldim vectors, r0 | |
| 2 setvbr r0 | |
| 3 ;current color value | |
| 4 ldim 0, r0 | |
| 5 ;color increment | |
| 6 ldim $11, r3 | |
| 7 ldimh $1, r3 | |
| 8 ;Palette RAM address | |
| 9 ldim 0, r1 | |
| 10 ldimh $FF, r1 | |
| 11 ;enable interrupt | |
| 12 ori 1, sr | |
| 13 ;Timer Value | |
| 14 ldim $FF, r2 | |
| 15 ldimh $FF, r2 | |
| 16 outi $A, r2 | |
| 17 wait | |
| 18 bra wait | |
| 19 ;shouldn't get here, disable timer so it's clear something broke | |
| 20 ldim 0, r2 | |
| 21 outi $A, r2 | |
| 22 bra wait | |
| 23 | |
| 24 vectors: | |
| 25 dc.w timer_handler | |
| 26 | |
| 27 timer_handler | |
| 28 outi $E, r1 | |
| 29 outi $F, r0 | |
| 30 add r3, r0, r0 | |
| 31 reti r4 | |
| 32 |