Post by thread:1 Hz [OT]

part 0 742 bytes content-type:application/octet-stream; (decoded 7bit) I decided that making a servo controller for my first ASM project was a little over my head... so instead I decided to see how accurately I could create a 1Hz signal (50% duty cycle) The code that I attached is my first try... I have been debugging it for a few hours now and I will be darned if I know what is wrong with it. All I know is that the LED stays lit constantly. If anyone has a spare moment maybe they could take a look at it for me. Thanks, Sam Content-Type: application/octet-stream; name="led.asm" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="led.asm" Attachment converted: definition:led.asm (????/----) (00014396)

The most blatant error I can see is that you have located your CBLOCK at location 0. User ram does not start at 0!! You should move this to (of the top of my head) location 12 for the 16F84. What are you defining all the register names yourself? MPASM has a bunch of include files to save you the chore of doing this. Simply include the relevant file at the top of your source like so: include <p16f84.inc> Hope that helps. Mike > {Original Message removed}

>The most blatant error I can see is that you have located your CBLOCK at >location 0. User ram does not start at 0!! You should move this to (of the >top of my head) location 12 for the 16F84. <snip> Thanks Mike! Got the LED blinking! YAY!!!! My first ASM project is finally doing something. Now I just need to find out why it is blinking too slowly =(

> >The most blatant error I can see is that you have located your CBLOCK at > >location 0. User ram does not start at 0!! You should move this to (of > the > >top of my head) location 12 for the 16F84. > <snip> > {Original Message removed}

part 0 864 bytes content-type:application/octet-stream; (decoded 7bit) Yep, I using a 10.000 Mhz +/- .05% ceramic resonator... and yes, it is visibly too slow. I found something that I forgot to add to code, fixed it and it seems _better_ but still when I compare it to my watch it looses about 1 second every minute or so. hold on <smile> I will try it again... it does seem off... I am pretty sure my calculations are correct. Attached is the new code. I added a couple of lines at the very bottom of the code to set the "loops" register back to 200. :) Thanks for all your help, thanks everyone. This is a great mailing list. Samuel Content-Type: application/octet-stream; name="led.asm" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="led.asm" Attachment converted: creation:led.asm (????/----) (00014575)

Well, after posting that message I think I found out where my problem is... *sighs* BCF PORTA,1 ;Turn LED on DELAY0 NOP NOP NOP NOP LOOP NOP D0A NOP . . . DECFSZ counts,1 ;Delay 25 cycles for "counts" times. GOTO DELAY0 ;Eats 2 cycles (unless skipped) NOP ;Clean up cycle lost from DECFSZ MOVLW 250 MOVWF counts DECFSZ loops,1 ;Delay ("counts" * 25 cycles) for "loops" times GOTO D0A ;Eats 2 cycles (unless skipped) NOP ;Clean up cycle lost from DECFSZ BSF PORTA,1 ;Turn LED off I dont know how to explain this... but when there is no more "loops" left to do... I am really getting 30 Cycles instead of 25. :/ The code will work until the very last "loops" ... if anyone has any idea how to fix that.. it would be great. Thanks.