| ??? 06/26/06 15:24 Read: times |
#119115 - timer0 problem |
I've read the proper section of the tutorial and several books.
ET0 is set. TH0 is #-30. TMOD is 2 (I intend for timer0 to be an 8-bit auto-reload timer). IE is set. In one of my ISRs, I set TR0. This should start a ~30usec interval interrupt going. I use LEDs for debugging, and I can see that I get to the code in the first ISR that turns on TR0. But the LEDs indicate that I never get into the timer0 ISR. I set up my timer0 ISR the same way as the other working ISRs, by orging 0xb and ljmping to my ISR. If my setup is OK, then I guess I just have a bug somewhere. But it's mystifying to me how I can set TR0 in one ISR, exit that ISR, and never get into the ISR for timer0. Thanks for any help. |
| Topic | Author | Date |
| timer0 problem | 01/01/70 00:00 | |
| LEDs and the eye | 01/01/70 00:00 | |
| I never turn it off | 01/01/70 00:00 | |
| use simulator | 01/01/70 00:00 | |
| what's in IE | 01/01/70 00:00 | |
| IE | 01/01/70 00:00 | |
| with reti, not ret? | 01/01/70 00:00 | |
| yes, reti. I know why ret would screw up | 01/01/70 00:00 | |
| time to show the formatted and commented | 01/01/70 00:00 | |
| I will work on cutting it down | 01/01/70 00:00 | |
| easy | 01/01/70 00:00 | |
| Timer O ISR | 01/01/70 00:00 | |
| addition | 01/01/70 00:00 | |
| that's good thinking | 01/01/70 00:00 | |
| enough guesses | 01/01/70 00:00 | |
| some code | 01/01/70 00:00 | |
| comments which you do not have | 01/01/70 00:00 | |
| re | 01/01/70 00:00 | |
| there is no such thing | 01/01/70 00:00 | |
| re | 01/01/70 00:00 | |
| EDT | 01/01/70 00:00 | |
| if you want get help... | 01/01/70 00:00 | |
| he can't do that | 01/01/70 00:00 | |
| ???splitting | 01/01/70 00:00 | |
if you look at me, you will know :) | 01/01/70 00:00 |