Hi all! I'm a novice in Linux In a program I'm writing in c, when I use the read() function for reading a byte in the serial port with a configuration: 115200 bps, 8N2 takes from 2ms to 6ms (aleatory, even if read up to 10 bytes takes the same time), which is too long. (ioctl(fd, FIONREAD, &bytes) last the same) This is the time is suppose to last: 8 bits: data 2 bits: stop 1 bit: start time = ((8+2+1)bits/115200bps) = 0.095ms, then when I read the byte with the function inb_p() takes ~ 0.1ms which is perfect, what I'm needing for my project. The problem I'm having is that I use signals (with fcntl(fd, F_SETFL, O_ASYNC) ) but this signals last the same time in occur that the read() (unacceptable) so I guess that this is a problem of the driver that is to slow. So the question is, is there any way to improve the performance of the driver, or how can I have a faster response with read()? (doing inb_p is very nasty). Do I'm doing something wrong? Thanks in advance!, I expect as soon as possible any answer PD: sorry for my bad English, -- To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
