Hi
Fernando,
This
mailing list covers LTIB. For future LPC32xx arch specific
questions, please consider posting
them
on the Yahoo lpc3000 newsgroup. You'll get more help
specific to the lpc32xx devices
there.
From
your boot output, it seems you have the drivers registered
correctly.
>lpc32xx_hsuart.0:
ttyTX0
at MMIO 0x40014000 (irq = 26) is a lpc32xx_hsuart
>lpc32xx_hsuart.0: ttyTX1 at MMIO 0x40018000 (irq = 25) is a
lpc32xx_hsuart
>But do not work with "minicom" on DB9
connector.
>So, how to use UART on linux 2.6.27.8 (LTIB) in LPC3250?
Is
it just minicom that doesn't work?
Verify
/dev/ttyTX? has the correct permissions. See below:
address@hidden
/]# ls -l /dev/ttyTX*
crw-rw-rw-
1 root root 204, 196 Feb 24 2010
/dev/ttyTX0
crw-rw-rw-
1 root root 204, 197 Feb 24 2010 /dev/ttyTX1
As
a simple test, try sending a large file in the background out
on the port and verifying the
FIFO
interrupts are firing. See below the hsuart int count increasing
on each check:
address@hidden
/]# ls -la /boot/System.map
-rw-r--r--
1 root root 814004 Feb 24 2010
/boot/System.map
address@hidden
/]# cp /boot/System.map /dev/ttyTX0 &
address@hidden
/]# cat /proc/interrupts
CPU0
26:
2116 - lpc32xx_hsuart
address@hidden
/]# cat /proc/interrupts
CPU0
26:
2156 - lpc32xx_hsuart
address@hidden
/]# cat /proc/interrupts
CPU0
26:
2182 - lpc32xx_hsuart
address@hidden
/]#
If
it passes this simple test, somethings not right from the
chip pin out to the connector.
The
RX/TX may be swapped or the transceiver may not be working.
Or its possible the
UART
muxing may not be setup correctly. For example, U1_TX is a dedicated
pin, but
U1_RX
is muxed with several other pins. You need to specifically
setup mux states for
your
board in the board.c file or as part of the bootlloader
setup.
thanks,
Kevin
Hi.
How do I use the high speed serial ports?
Enable the LPC32xx high speed serial ports in the kernel driver
configuration
and select which high speed serial ports of the 3 you want to use in
the Linux
kernel configuration System Type-AE menu. Add the device nodes to the
/dev are
using the following command:
address@hidden /root]# mknod
/dev/ttyTX0 c 204
196
address@hidden /root]# mknod /dev/ttyTX1 c 204 197
address@hidden /root]# mknod /dev/ttyTX2 c 204 198
Page 3 in http://ics.nxp.com/support/documents/microcontrollers/pdf/lpc32xx.bsp.linux.faq.pdf
ttyTX0 = DB9 connector
Regards.
--
Fernando Vilmar Palha
Engenheiro de Computação
Nautec Eletrônica Ltda
Em 24/2/2010 11:24, Fernando Vilmar Palha escreveu:
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