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Recent content by ChriX

  1. ChriX

    ASM table lookups

    Infact, playing with ICD now, it seems to reliably break at 0x00 every time I run it. It will however get through a few loops as you see the bitmap flash up on the screen occasionally.
  2. ChriX

    ASM table lookups

    Thanks for the reply. I hadn't, but I have just added a clrf PCLATH after each call to SCREENLOOKUP with no difference in the result - same strange behaviour etc.
  3. ChriX

    ASM table lookups

    Good evening all. I wonder if anyone can see anything immediately wrong with my code excerpt below. I have spent a LONG time debugging this and I cannot get it to work as intended. I put together a quick 64x16 LED matrix panel using shift registers, and am trying to drive it using a 16F870. I...
  4. ChriX

    ASM programming problem

    You legend Nigel! Put my tables at the beginning of memory and it works fine. I can't believe in all the work i've done with PICs before that i've never even heard about this boundary limitation. I now understand why there is such a limitation though, but never found it mentioned in any of the...
  5. ChriX

    ASM programming problem

    I've been trying to add more NMEA sentences stored as data tables to the program for my GPS project, but am getting strange results. I can only describe the problem - don't really want to post my full code as it's a bit messy at the moment and you will all laugh :p Right, so previously I had...
  6. ChriX

    two hardware usarts

    I also thought there was a UART column, i'm sure i've seen one before. Anyway now they seem to be listed in the 'Interface' column, so just do CTRL-F and search the page for '2 EUSART' or '2 AUSART' - seems to be all 18 series from what I can see.
  7. ChriX

    GPS Speed meter

    It could in theory, i'd have doubts about obstacle avoidance unless the obstacles were the size of small houses or something due to the accuracy of GPS. Nigel, it went a quite dissapointing 26mph last time I checked it, but then I do have it geared for acceleration at the moment and the engine...
  8. ChriX

    GPS Speed meter

    Thanks Nigel! I used the MAX232 because the GPS module ouput talks in LVTTL, I thought the PIC would be able to handle these levels, but when testing it it couldn't. So as I had a 232 to hand i've just put the output from the GPS into the TTL side, bridged the RS232 side and connected the output...
  9. ChriX

    GPS Speed meter

    Hi all, just wanted to post my recently completed GPS speed meter. The idea is to have something that saves the maximum speed reached, for the main purpose of sticking to my RC car. I was quite pleased with how small I managed to make it without getting a proper PCB done so wanted to show off :p...
  10. ChriX

    ICD2 problem

    Out of interest which clone did you get?
  11. ChriX

    KMH to MPH conversion

    Wow, thanks guys, I actually get what is going on which is pretty rare - you explain it well! The value in KMH will never be above 655, if I do find myself going 406 MPH on land I probably wont be looking at my little GPS! So I have multiplied by 100 and converted to 16 bit binary. Now trying...
  12. ChriX

    KMH to MPH conversion

    I'm doing a project with a 16F628 and a GPS receiver. The only problem is that I need to get a reading in MPH rather than KMH as given by the receiver so I need to do a conversion on the PIC. It's relatively simple to do (when not dealing with asm that is!) as it's only a multiplication by...
  13. ChriX

    Problem with Winpicprog and P16PRO40

    Just to let you know i've tried quite extensively in the past to get this programmer to work on newer machines (A64s) with no luck - so if you do manage i'm interested! I'm on the verge of getting an ICD2 as well though. :)
  14. ChriX

    P16PRO40 Problem

    I was using PicallW but now i'm using Nigels software as it seems a lot less tempremental.
  15. ChriX

    P16PRO40 Problem

    You can ignore the above now! After all that time I never thought to actually check the hardware, turned out one of the transistors had been pushed through and the solder joint broken. Problem solved! :)
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