Timeline for Why am I getting the wrong timer frequency in PIC microcontroller application?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Jun 7, 2023 at 14:47 | vote | accept | RickyBoy | ||
| Jun 7, 2023 at 14:47 | comment | added | RickyBoy | Thanks very much | |
| Jun 7, 2023 at 12:28 | comment | added | glen_geek | RickyBoy - "-=" or "+=" as you please. When you leave home, do you count the kilometers from home, or kilometers to your destination? Consider code readability for someone else. Slightly safer to add/subtract TMR0 early in the ISR while its count value is low, to avoid potential math overflow if TMR_RESET_VALUE approaches 255. | |
| Jun 7, 2023 at 9:53 | comment | added | RickyBoy | Thanks for this answer, lots of very useful info. I wonder whether: a) the reset should be TMR += TMR_RESET_VALUE b) the reset should be the last line of the ISR I did this and I now have both LEDs only 1% off-target. (Agree about the use of PWM - this exercise was simply one for me to learn the use of timers and their interrupts - the ultimate application requires it) | |
| Jun 7, 2023 at 4:00 | history | edited | glen_geek | CC BY-SA 4.0 |
Tried MPLAB's simulator and found anomolies with subtracting a constant from a running TMR0
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| Jun 6, 2023 at 19:32 | history | answered | glen_geek | CC BY-SA 4.0 |