Using uart1 rts and cts

[Tom Davies]

I am using uart 5 with hardware flow control quite happily.

As I don't have any hardware cape installed, I thought that I would be able to use uart 1 -- while I would be remuxing both i2c2 pins, my reading of the documentation was that with no cape installed, that would be OK.

But I wasn't able to get that working -- while uart 1 worked without hardware flow control, as soon as I enabled cts/rts I couldn't transmit through the port.

Using uart 5 instead is OK, but I'm curious as to why uart 1 rts/cts wouldn't work?

Thanks,

   Tom

[Thorsten von Eicken]

How about providing some info? Such as:

$ cat /proc/tty/driver/OMAP-SERIAL

$ stty -F /dev/ttyO1 -a

$ dmesg | grep capemgr

Maybe you need to tweak the port settings a bit? For example, stty clocal (I believe that disables DTR/DSR/CD, but I'm not totally sure).

Thorsten

[mitterma...@gmail.com]

Hi,

I do have the same issue. I want to use the RTS Pin for UART1.
I already tried to teak the uart with stty like
stty -F /dev/ttyO1 clocal
stty -F /dev/ttyO1 -hupcl
and
cat /proc/tty/driver/OMAP-SERIAL shows
  1: uart:OMAP UART1 mmio:0x48022000 irq:89 tx:1036 rx:4367 brk:1 RTS|CTS|DTR|DSR|CD|RI

but for example avrdude can not reset the UART device.

Tom did you get it running?

[David Marquart]

I haven't really looked too hard, but my first guess would be that in uEnv.txt you would need to disable i2c2 pinmux like what is done with hdmi/emmc when you don't want that.  On 3.12.6 kernel I had to actually remove pinmux for hdmi before I rebuilt the kernel.

[mitterma...@gmail.com]

Which name should I use? Only i2c2 does not work..