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Re: use ttyS1 as normal serial port on devboard82?
This is just what we need - interrupt driven serial drivers without using DMA,
hopefully also LPT drivers in the same way. Please publish them or send them
asap, we just came to this problem.
> ----- Original Message -----
> From: "Henrik Jönsson" <email@example.com>
> To: <firstname.lastname@example.org>
> Sent: Monday, September 29, 2003 2:13 PM
> Subject: use ttyS1 as normal serial port on devboard82?
> > Is it possible to use ttyS1 (X25 pin header) as a regular serial port? We
> > have enabled it in the kernel:
> > [*] Serial port 1 enabled
> > (No_DTR_RI_DSR_CD) Ser1 DTR, RI, DSR and CD assignment
> > Correct? Should DTR_RI_DSR_CD be enabled? With these settings the devboard
> > crashes when we try "echo HEJ > /dev/ttyS1".
> > dmesg shows:
> > ttyS0 at 0xb0000060 is a builtin UART with DMA
> > ttyS1 at 0xb0000068 is a builtin UART with DMA
> > ttyS2 at 0xb0000070 is a builtin UART with DMA
> > We know it's 3.3v levels so we have to use a level-shifter to get standard
> > RS232 voltage.
> > We are already using ttyS0 and ttyS2 so it would be great if tou told us
> > it's possible to use ttyS1 as a third serial port!
> > Regards
> > Henke
> Shouldn't be any problem, but ser1 (ttyS1) uses same DMA channels as USB,
> so you can't use them at the same time.
> Latest version of the serial driver supports using interrupt driven transfer
> without DMA - I don't think we have published that yet though.