SHOW:
|
|
- or go back to the newest paste.
| 1 | // what is this code supposed to do?: | |
| 2 | // - setup dptr to point to the sample buffer | |
| 3 | // - wait for bit 2 on port B to become 0 (fixed trigger for now) | |
| 4 | // - activate time 1 | |
| 5 | // - wait until timer 1 overflow bit is set and store a sample | |
| 6 | // - do this 16*0x100 times | |
| 7 | // - exit | |
| 8 | ||
| 9 | // TIMER SETUP | |
| 10 | // timer 1 ticks a 1 us -> | |
| 11 | TH1 = 0xff - 2; // set timer 1 reload value | |
| 12 | TL1 = 0xff - 2; // set timer 1 value | |
| 13 | ||
| 14 | __sbit __at (0xB0+7) TF1; | |
| 15 | ||
| 16 | // DATA ACQUISITION | |
| 17 | __asm | |
| 18 | // load sample ptr | |
| 19 | mov dpl, #0 //#(samples & 0xff) // is a 256 byte boundary so it is actually 0 | |
| 20 | mov dph, #(_samples >> 8) | |
| 21 | mov r0, #0 | |
| 22 | mov r1, #0 | |
| 23 | ||
| 24 | // wait for trigger condition | |
| 25 | 00001$: | |
| 26 | mov A, _IOB | |
| 27 | anl A, 0x02 | |
| 28 | cjne A, 0, 00001$ | |
| 29 | ||
| 30 | // trigger condition is met, start timer | |
| 31 | orl _TCON, #0x40 | |
| 32 | ||
| 33 | // put sample into buffer | |
| 34 | 00002$: | |
| 35 | mov A, _IOB | |
| 36 | - | // movx @DPTR, A // store samples |
| 36 | + | movx @DPTR, A // store samples |
| 37 | - | // inc DPTR |
| 37 | + | inc DPTR |
| 38 | - | movx @R0, A |
| 38 | + | // movx @R0, A |
| 39 | inc R0 | |
| 40 | // cjne dpl, #0, 00003$ | |
| 41 | cjne R0, #0, 00003$ | |
| 42 | inc r1 | |
| 43 | - | inc dph |
| 43 | + | // inc dph |
| 44 | cjne r1, #16, 00003$ | |
| 45 | sjmp 00004$ | |
| 46 | ||
| 47 | 00003$: | |
| 48 | // jbc _TCON.7, 0002$ | |
| 49 | jbc TF1, 0002$ | |
| 50 | sjmp 00003$ | |
| 51 | ||
| 52 | 00004$: | |
| 53 | ||
| 54 | __endasm; |
