bootloader / SIOW "timeout while downloading"

soundscu · Joined: 29 Jun 2007 Posts: 62 Location: Raleigh, NC

I'm trying to get the ccs bootloader working with a PIC16F883. I suspect the code in the chip is working (it compiles ok), but the SIOW reports "timeout while downloading".

When I look at the rx and tx pins with a scope, it looks like the PC has not sent anything... it reports a timeout before trying to communicate with the target.

Using a simple teminal emulator, I've proven the hardware and com ports are working. I can send text from the chip to the PC, and from the PC keyboard to the chip.

But the SIOW download routine does not work for me. Any suggestions? :)

grasspuddle · Joined: 15 Jun 2006 Posts: 66

when using siow, do you select 'open file' or 'download software' from the file menu?

when you said you proved it worked with the simple terminal program, did it download or did you just see the transmission in the scope?

soundscu · Joined: 29 Jun 2007 Posts: 62 Location: Raleigh, NC

I was mistaken about SIOW not sending anything at all. When I use the download function, it sends the first line of the hex file, then ignores or misses the returned ACK byte, and times out.

After some further debugging, I now have a fully functional bootloader running on the PIC16F883 (which was no simple task, because the CCS write_program_memory routine doesn't work for this part and I had to write my own substitute).

Using a terminal program to upload the ASCII hex file to the target, it responds correctly to XON/XOFF for flow control on a 3-wire port, resets the chip when done and runs the new code.

But it's still no-go with SIOW.

Jim

lipeesh · Joined: 06 Jul 2007 Posts: 5 Location: bangalore

could you please explain how u download your application code through siow........

am using PIC18F258 device..........when using siow open file option am getting the excat nummer of acknowledgements...but application is not running......but when using download option,after oneline 'timeout in downloading message' cums..............

please advice me on this!!!!!!!!!!!!!!!
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lipeesh

soundscu · Joined: 29 Jun 2007 Posts: 62 Location: Raleigh, NC

SIOW does not work for me. I got the following somewhat useless suggestion from CCS:

"You can log all events for the SIOW in a log file. Set the logging options - file name, path in the configuration tab, and enable logging in the File Tab.
You can also add time stamps to this log by selecting Time Stamp on new line in the diaplay menu under configuration tab. This will help you debug any communication issues you may be having while downloading program onto the PIC using SIOW."

I'm uploading hex files to my bootloader using CRT5 from Van Dyke Technologies -- it's a good quality terminal emulator.

Jim

lipeesh · Joined: 06 Jul 2007 Posts: 5 Location: bangalore

what is the substitute routine you have used instead of write_program_memory?
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lipeesh

soundscu · Joined: 29 Jun 2007 Posts: 62 Location: Raleigh, NC

I wrote it myself; it is not available for distribution. It meets the requirements of the PIC16F883 only.

(Note that the write_program_memory routine does work for the PIC16F887, which has a slightly different flash implementation. In my case, it wasn't an option to change processors.)

Jim

RolandAldridge · Joined: 26 Mar 2007 Posts: 7 Location: Southern California

If you are using the ccs bootloader, you need to set up SIOW to use no flow control, rather than the Xon/Xoff option.

I've had the ccs bootloader working with SIOW using an 18F2525 for a while now.

Roland
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Roland Aldridge
www.amio2.com

Krishna · Guest

I am trying to download software through SIOW.exe... but i get the same error: time out.

Can anyone explain the configuration settings like
baudrate,data bits,flow control etc so that i can successfully download my code...

Thank you,
Vamsi