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RE: Writing to Serial Port


> Hi all
> 
> I am busy writing an app that needs to regularly write to the serial
> port. The response time is fairly critical. I ahve read the serial
> programming HOWTO but that deals mainly with reading, which I have
> managed to get working fine. The problem I am having is that write()
> does not seem to be immediate and seems to work sometimes. i need to
> force the program to not cache writes to the serial port but 
> output them
> directly. 
> 
> If someone could point me in the direction of some FM's (as in RTFM) I
> would really appreciate it. Some pointers would also come in handy.

Hmm, you might want to give a lot more details such as what platform
you are running on? If you have an OS, you might want to have a look
at the O_SYNC option of open(2).

HTH,
Y.


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