I enabled software flow control like below tty.c_iflag |= (IXON | IXOFF | IXANY); But I still having the data loss issue. Regards Arun On Wed, Aug 5, 2015 at 12:59 AM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote: > On 08/03/2015 10:47 PM, arun k wrote: >> Thank you for the reply >> >>>> The tty layer is limiting you, just keep reading in a loop until you >>>> run out of data, you should not ever expect to read a specific number of >>>> bytes from a tty device at a time, the read call will tell you the >>>> number that was read properly. >> >> I tried this method but in my case I found data loss. By changing any buffer size modification in driver side , can we fix this issue ? > > The data loss is probably occurring because you have all flow control disabled > and the line speed is too fast for no flow control. > > Regards, > Peter Hurley > >>>> Please don't use the "generic" driver, it's slow and not the best to >>>> use >> >> Could you tell me is generic driver is suitable for my application ( My usb device sending data at a rate of 409600 bytes/sec) , ? >> or do you have any other suggestion for me ? >> >> My Linux kernel version is 3.4.35 >> >> Regards, >> Arun >> >> On Tue, Aug 4, 2015 at 1:13 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx <mailto:gregkh@xxxxxxxxxxxxxxxxxxx>> wrote: >> >> On Mon, Aug 03, 2015 at 04:44:07PM +0900, arun k wrote: >> > Hi , >> > >> > I have a trouble with using usb serial generic device. >> > I am using USB - Generic Serial driver for communicating with my usb >> > device and my embedded device. >> >> Please don't use the "generic" driver, it's slow and not the best to >> use. >> >> > My usb device sending data at a rate of 409600 bytes/sec, and in host >> > side application I tried to read 16384 bytes in one read. But the read >> > size returning is always 4095 >> >> The tty layer is limiting you, just keep reading in a loop until you >> run out of data, you should not ever expect to read a specific number of >> bytes from a tty device at a time, the read call will tell you the >> number that was read properly. >> >> thanks, >> >> greg k-h >> >> > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
