Re: [Ftdi-usb-sio-devel] Long delay between break signal and first data bytes

[Peter K. <pet...@we...>]

Bill,

I tried tcsendbreak with a value of 1 (and other non zero) which 
resulted in no break beeing sent at all.
The problem here is, that the protocoll on the bus I am talking to does 
not allow a delay longer than a character after the break. Whatever I 
tried, it always caused a long break.
I even build a smal circuit that pulls the BUS Tx Signal to ground by 
using RTS. The interesting behaviour then is:

TX  ~~~,___,~~~~~~~||||
RTS ~~~,___,~~~~~~
            |<-.?.->|

Delay of about 50ms betwen raise of RTS and first data byte. The code 
does not implement any delays except for the RTS.

Not sure what this means? Is there anything in addition that I missed in 
programming the FTDI Driver?

Thanks for your patience.  Peter

Bill Ryder wrote:

 > Did you try tcsendbreak with a set value rather than 0?
 >
 > By default it may wait up to 500ms even though data isn't being sent 
for 500ms
 >
 > You can check it with strace -T yourTestProgram  - you'll see the 
duration of tcsendbreak in <>'s in the output.
 >