bootloader and SIOW XON/XOFF protocol problem

moutinho · Joined: 12 May 2005 Posts: 31 Location: BRAZIL

Hi,

I am testing the booltoader.c example that comes wih the CCS 3.206. I am using SIOW terminal program in order to send HEX files to the bootloader application. The bootloader.c suspends reception using XOFF command. I have placed a breakpoint just after this command but it seems that the SIOW (Serial Input/Output Monitor) program does not understand this command and display a TIMEOUT error message box. I am trying to use the command File->Download Software.
If I do not stop execution, the file is transfered successfully.

Should I use another command or must set any configuration ?

Thanks,
Andre

Ttelmah · Guest

How is the communication port setup in device manager?. Normally programs of this sort, 'inherit' the settings from here, unless they have the ability to override them.

Best Wishes

moutinho · Joined: 12 May 2005 Posts: 31 Location: BRAZIL

Hi,

bps - 9600
data bit - 8
parity - none
stop bit - 1
control - Xon/Xoff
Advanced - do not using buffer.. (unchecked)

Should I try anothe terminal program? such as hyperterminal?

Thanks,
Andre

Ian McCrum · Joined: 26 Oct 2003 Posts: 14 Location: Northern Ireland

It is VERY important that you do not use the 16(15!) byte fifo buffer which is part of the uart in most modern PCs. Make sure it is disabled.

Worst case scenario is to use big end of line delays - some terminal emulators will allow this for text uploads.

Hope that helps. - I did use a xon/xoff version of the bootloader with windows 98 and had no bother - I came back to it a year or so ago and had a lot of bother with windows 2000. I gave up and wired up a handshake line and use it now... allows download from hyperterminal and so should run on any PC.

b4n
Ian
_________________
Ian McCrum, email address held at
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chingB · Joined: 29 Dec 2003 Posts: 81

I made a modification of the included bootloader example of CCS and I made an visual basic apps for downloading the code to the PIC. I never use the SIOW that came with the compiler.

I already tested it on RS485 communication at 115,200bps and it work perfect.

moutinho · Joined: 12 May 2005 Posts: 31 Location: BRAZIL

Hi,

I did the same using Builder C++. My bootloader is composed by 3 distint process. The first process half the memory copied into the second part of the memory. In the second process, the content of the second part of the memory is copied into the first part. Finnally, in the third process the remaining of the code is copied into the second part of the memory. With this I have accomplished an update proccess in which the bootloader (processes 1 and 2) is also updated. All this using serial.
Now I will change from serial to GPRS and the update will be accomplished over the air (OTA).

Andre