Maciej W. Rozycki wrote:
On Thu, 26 Jul 2007, Lee Howard wrote:
If the application were to use TIOCM_RTS how would it know when to apply it or
not? Is there some approach that the application could take to manage flow
control on the serial port? What about software flow control? Does the
Well, an application could negate RTS when it receives a character and
is running out of resources for further processing of incoming data.
Smarter UARTs may be able to negate RTS themselves based on the amount of
data in their receive FIFO. The threshold may be configurable.
Okay, so let's say we've got a loop around a blocking read on the modem
file descriptor...
for (;;) {
read some data from modem
process data from modem
if (end-of-data detected) break;
}
Are you suggesting that the application should be using deasserting RTS
after the read and asserting it before?
I had previously thought that the control of RTS was something that the
serial/tty driver was supposed to do independently based on the buffer
fill. Was I wrong?
Thanks,
Lee.
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