Unable to connect at specific baudrate, reduce & reset in ISP mode

[prasi79]

Hi,
Kindly help to address this issue, I have been working around this for last couple of days to trouble shoot this issue, still yet to find out the root cause for the same.  some time back I was using this tool and was working fine, but know not able to establish the communication at all, some the activities i have carried out to trouble shoot are given below,
I have was suspecting comport in the begining & its working fine with the hyper terminal.

Then I  tried with controller replacing didn't work.

Tried installing with older & new version of flashmagic ( V 2.4 to latest version available on net) no improvements found.

Changed MAX232 IC didn't work.

New development board also didn't

Final with USB to Serial cable even with this I am not able to work now.

Pls., let the what could be going wrong & how to over come this I am not able to trouble shoot on this.

Kindly let me know if this type of issue has been address earlier.

Regards........
Prasi

[keets]

I am facing the same problem. I don't know how to solve it. I changed no. of max232 ics. It works only with my older max232 ic.
Either Max 232 ics in the market are faulty or there is some problem with Flash Magic.

[Andy Ayre]

Prasi - FM is sending a 'U' to your device and FM is then either getting nothing back or junk. The device should echo back the 'U'. Please put a scope on various points of the send and receive transmission paths between the COM port and the device's TxD and RxD pins and let us know what you find.

Andy