Re: [Gumstix-users] ttyS3 and audiostix

[Darren G. <ts...@ya...>]

On Mar 6, 2005, at 3:53 PM, David Farrell wrote:
>> 4128 - 4096 = 32
>
> See pxa.c transmit limited to fifosize/2. So your match is right on.  
> SW buffer (4096) + fifo/2
> = the 4128 you are preparing to send, but never do.

excellent!

>>  looks
>> like I need to disable
>> Auto Flow Control.  I did that with pxaregs,
>> but when my application
>> opens the serial port, it gets set again.
>>
>> HWUART MCR Register
>> HW_MCR                   0x0000002b  00000000
>> 00000000 00000000 00101011
>
> Just tie the CTS line hi. Don't bother trying
> to disable in sw. > 3V is high, 5V is fine.

Hmmm... can't figure out where to do that.  It doesn't look like the 
CTS line is brought out on the audiostix.  I thought I might be able to 
be clever and start my app in the background and then use pxaregs to 
disable flow control.  But the driver resets it again instantly.