software reset

bostamy · Post by **bostamy** » Thu Nov 05, 2009 2:23 am

I am trying to get the software reset to work on my PIC 18f2580. I loaded the hex file for the bootloader and when i physically pull the MCLR pin to ground the chip resets and it programs but the software can't seem to do this. Does anyone have a circuit of how I should wire the rs-232 to the pic to enable software reset?

Doj · Post by **Doj** » Sat Nov 07, 2009 12:19 am

Hello bostamy,
I am not sure quite where you are coming from when you say "the software reset".
I think you need to do a reset sometime when using a bootloader(which I never have) and I expect this is normally a button on the PCB.

Despite my confessed lack of understanding I have answered the thread as I use the software reset function in my own code as an exception handler when all else fails(works a treat!)

I use the ASM wrapper thus:-

Code: Select all

ASM
    reset
End ASM

You can call it as a function and it does exactly what you might expect.

Jon Chandler · Post by **Jon Chandler** » Sun Nov 08, 2009 3:01 pm

I believe you're asking about how to make the bootloader automatically do a reset to download the hex file?

The MCLoader (supplied with Swordfish) uses the RS-232 signal DTR to trigger a reset. A schematic is in the MCLoader docmentation file. (I can't figure out how to upload a picture - grrrr)

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