Thanks, Jim

1. Also, from the I/O page in the wiki:

http://www.gumstix.org/tikiwiki/tiki-index.php?page=I%2FO


UART
    *       Logic level (3.3V) signals
      *       FFUART speeds to 230 kbps (normally mapped to ttyS0 in the kernel and Y0 in some schematics )
   *       STUART speeds to 230 kbps (normally mapped to ttyS2)
    *       HWUART speeds to 921 kbps (normally mapped to ttyS3 in the kernel and Y1 in some schematics)
    *       Both can use RxD, TxD, RTS, CTS.

        *       BTUART is not an exposed interface; mapped to ttyS1 by the kernel and connected physically to the bluetooth module if one is present.

        *       Note! Current kernels use ttyS3 (HWUART) for bluetooth. This is available on the BTUART pins by setting GPIO42 and 43 to AF3 - and this is the default configuration. This can be very confusing if you want to use the HWUART for something else! To re-enable HWUART on ttyS3, make bluetooth use ttyS1 (see /etc/default/bluetooth) and then set GPIO42 to AF1 in and GPIO43 to AF2 out. You can then set GPIO48 to AF1 out (HWUART TXD) and GPIO49 to AF1 in (HWUART RXD).


2. Note that there are some changes forthcoming in the assignment of pins on the Hirose. These are detailed in the "Revision Notification" forum in the wiki.

Look for the  'Four (4) UARTs'  topic here http://www.gumstix.org/tikiwiki/tiki-view_forum.php?forumId=4



Don
++++++++++


At 7:20 AM -0600 12/1/05, Jim Walters wrote:
Hi Paul,

The references to FF, HW, and ST refer to the Intel PXA255 names for the different UARTS.  You can see which hardware devices are mapped to which Linux tty devices by looking at the kernel boot listing.  There's a bit of information about which of the xUART boards has which hardware UARTS brought out to what ports at:
http://www.gumstix.org/tikiwiki/tiki-view_faq.php?faqId=13

I don't think that the hardware handshaking lines are brought out on the normal waysmall STUART expansion boards because it only has one level shifter working for both ports.  If you have the waysmall HWUART expansion board, you can have the RTS and CTS lines on one of the serial ports, but there are other complications (see the link above for what works with what).  I think that a more complete serial port with all the hardware handshaking lines available on a PC would require something special for a gumstix, including hardware and software mods.

Thanks,

Jim Walters

Paul Arch wrote:
Hi,

on the gumstix waysmall STUART board, there are two serial ports - I  can figure that one out by looking at it !

What I am confused about are all the references to FF-UART, HW-UART, and ST-UART.

Can someone tell me what is accessible via which /dev/tty device ?  What is the differences between these ? Are they only usable with software flow control ? What if you want hardware flow control ?

Also from the schematics, the waysmall STUART has two connectors with RX,TX and ground lines - what about the CTS and RTS lines, where have these gone ?  At the end of the day, I just want to have access to Rx,Tx, Gnd, RTS, CTS and maybe DCD and DSR ?

Cheers

Paul Arch



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Don Anderson               http://www.gumstix.com

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