usb to serial converter non standard baud rate

scgs · 06-12-2006, 09:48 PM

I am using a sealvel USB to serial converter on a Fedora Core 5. I need to set the baud rate of the serial port to 500k. How can i do that? I tried setserial with speed_cust but it did not work. I have read about using tty -> alt_speed or using TIOCGSERIAL ioctl but i do not really understand how to implement them. Can anybody please help. Thanks

jineshkj · 06-13-2006, 02:03 AM

http://www.linuxquestions.org/questi...ead.php?t=6532

scgs · 06-13-2006, 08:09 AM

I have read through the above post but in my case the baud rate to be set is 500k. And what i understand from the serial_struct is that the divisor should be an int. I also inderstand that there are restrictions to the max value of baud_base (I might be wrong, I don't know). Can you recemmend me what value should i use for the baud_base and for the divisor to get a 500kbps.

jineshkj · 06-13-2006, 11:16 PM

hi,

i'm not that good in serial programming, but from my experience, what i know is that every serial port controller will have some clock source to drive it. if u know the rate of the clock, u can calculate the divisor by which to divide the clock.

the exact formula infact depends upon the manufacturer specification. i hope if u can get the clk rate and the formula for calculating the divisor, then the rest would be easy.

i hope i'm right.