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Altera_Forum's avatar
Altera_Forum
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16 years ago

uClinux: Use the alternative touch screen driver

Hi,

I tried to use an "elo serial touch" driver (enabled in the uClinux kernel config) for an external display, connected to my Nios II Embedded Evaluation Kit.

Unfortunately I'm new to the whole uClinux / NIOS Processor stuff, and wanted to know if someone else got other touch screen to run / has experience with this drivers.

On the first attempt i tried to receive some signals with the from the touch screen (executing "event_test" application testing the /dev/ttyS0) but got no success.

uClinux-dist configuration:

Device Driver -->

Character Driver -->

--> serial ports --> Altera UART support

Input Device Driver -->

--> Touchscreen --> Elo serial touchscreen

--> Hardware I/O --> serial discipline

Library Config.:

--> tslib

MicroWin

--> usual configuration

+

--> use tslib

I did not modify anything else.

Would be nice if somebody could help me.

Appreciate,

J.Z.

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    HI,

    thank you for your fast reply and effort. Got the inputattach app.

    I enabled the "Serial port line discipline" option in the kernel config. As well as the "Event interface"

    Altera UART Support is enabled and is set to 9600 default Baud rate, as it's the default rate of the touch screen controller.

    The app "setserial" show the following information after booting uClinux:

    ...

    ttyJ0 at MMIO 0x8001410 (irq = 7) is a Altera JTAG UART

    console [ttyJ0] enabled

    ttyS0 at MMIO 0x8001340 (irq = 6) is a Altera UART

    ...

    /> setserial -a /dev/ttyS0

    /dev/ttyS0, Line 0, UART: undefined, Port: 0x0000, IRQ: 6

    Baud_base: 3125000, close_delay: 50, divisor: 0

    closing_wait: 3000

    Flags: spd_normal

    Seems the uart and port definition is missed and Baud rate is not the default one.

    I was able to set the Baud rate to 9600 with setserial but was not able to change uart.

    How do I check whether the board talks with the touch screen? (I'm new to the whole rs232 environment.)

    The display still does not react.

    Appreciate,

    J.Z.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Hi,

    I'm having a hard time to communicate with the external touch controller.

    I specified the app "inputattach" with proper parameters.

    Driver for the touch controller (Elo) was recognized (Inputattach running in background).

    But testing event0 (assigned to "elo touch" driver) has no result.

    I also tried the console device via serial port (Terminal emulator: HyperTerminal) which worked out fine.

    As earlier mentioned "setserial" brings still the following report:

    /> setserial -a /dev/ttyS0

    /dev/ttyS0, Line 0, UART: undefined, Port: 0x0000, IRQ: 6

    Baud_base: 3125000, close_delay: 50, divisor: 0

    closing_wait: 3000

    Flags: spd_normal

    Main Configuration of the kernel:

    + Device Driver -> Char. devices -> Virtual terminal

    + Device Driver -> Input device supp. -> Event interface

    + Device Driver -> Input device supp. -> Event debugging

    + Device Driver -> Input device supp. -> Touchscreens -> Elo serial touch

    + Device Driver -> Input device supp. -> Hardware I/O ports Serial port line discipline enabled

    + Device Driver -> Char. devices -> Serial drivers -> Altera UART support enabled (default baudrate 9600), Altera JTAG UART support (+ console support))

    (mouse and keyboard not included yet)

    Am I missing some options?

    PS: I also tried to activate the serial drivers "8250/16550 and compatible serial support" (Device drivers -> Char. devices -> serial drivers)

    but an error appears during compilation stating:

    ../nios2-linux/linux-2.6/drivers/serial/8250c:104:24: asm/serial.h: no such file or directory

    ..(compilation aborted)

    I would appreciate if someone could help me on that problem.

    Thank you in advance!

    D.