Weird problem on rs232 vs USB-serial...

mike antispam21 at
Mon Feb 23 20:37:28 UTC 2009

Joel Sherrill wrote:
>> One more addition is:
>> - if I use 'grmon' to connect to the DSU port, then load the same app 
>> with grmon and run,
>> I can see outputs coming out of the COM1 port.
>> - it was when I used the onboard bootrom to load the app to ram, then 
>> jump to it that I didn't
>> see any outputs on COM1 port. Again, when it's connected to 
>> USB<->serial, the outputs
>> came out fine, with the same app.
> Could the flow control settings be wrong in the comm application when 
> using the ttys0?
> I recall that minicom on unix defaults to HW flow control on.
Thanks Joel, I did set the minicom to use 'no flow control'...
It seems that the only variable is "ttyS1" vs "ttyUSB0" but I don't know 
what else to look...

More information about the users mailing list