Touchscreen issue in Andorid 2.3.4 on beagleboard xm

Hi Vishveshwar

We use the tsc2046 as the touchscreen controller, and use the ads7846 as the driver.

We could get less event infomation  running a game in getevent, and if don't play games, we could get regular event.

I think the driver may have some issue, but don't sure what the issue is.

Thanks,

Yanbin Yue

Hi Vishveshwar,
I am using beagleboard xM rev B, I build kernel (2.6.37) with ads7846 driver, did some modifications in board-omap3beagle.c.

I tried

# getevent

add device 1: /dev/input/event1
name: "ADS7846 Touchscreen"

could not get driver version for /dev/input/mouse0, Not a typewriter

add device 2: /dev/input/event3
name: "Logitech USB Optical Mouse"

could not get driver version for /dev/input/mouse1, Not a typewriter

add device 3: /dev/input/event0
name: "gpio-keys"

add device 4: /dev/input/event2
name: "twl4030_pwrbutton"

but events are not detecting.
Any suggestions would be appreciated,

Thanks,
Faisal Hassan

Hi Faisal,

Are you getting any touchscreen interrupts?

Please see output of "cat /proc/interrupts" command to check the touch screen interrupts.

Regards,
Pankaj Bharadiya

HI Pankaj Bharadiya,

Thanks for the response, Now its working, I configured touch sensor to SPI3.0...

Regards,

Faisal Hassan

Hi Faisal Hassan,

I have the same problem with you and suck at this thing.

It's very kind if  you show me how to configure touch sensor .

Thank you.

Hi  Nguyen Huu Ha,

How did you connected the touch sensor with beagleboard (pin details).

Regards,

Faisal Hassan

Thank you for your reply !

I connect it through expansion header,  I think I use spi3.0 . Not sure with this question but I will provide what I did.

Here's my spi_board_info:

   struct spi_board_info omap3evm_spi_board_info[] = {
[0] = {
.modalias = "ads7846",
.bus_num = 3,
.chip_select = 0,
.max_speed_hz = 1500000,
.controller_data = &ads7846_mcspi_config,
.irq = OMAP_GPIO_IRQ(OMAP3_EVM_TS_GPIO),
.platform_data = &ads7846_config,
},
};

static struct omap2_mcspi_device_config ads7846_mcspi_config = {
.turbo_mode = 0,
.single_channel = 1, /* 0: slave, 1: master */
};

struct ads7846_platform_data ads7846_config = {
.x_max = 0x0fff,
.y_max = 0x0fff,
.x_plate_ohms = 180,
.pressure_max = 255,
.debounce_max = 10,
.debounce_tol = 3,
.debounce_rep = 1,
.get_pendown_state = ads7846_get_pendown_state,
.keep_vref_on = 1,
.settle_delay_usecs = 150,
.wakeup = true,
};

When I boot:  my beagleboard recognized touchscreen:

spi3.0 supply vcc not found, using dummy regulator
ads7846 spi3.0: touchscreen, irq 293
input: ADS7846 Touchscreen as /devices/platform/omap2_mcspi.3/spi3.0/input/input1

 PS: I am using beagleboard rev C4 and here is my topic: http://e2e.ti.com/support/embedded/f/509/t/134487.aspx

Thank you.

Hi Nguyen Huu Ha,

As this discussion was already answer verified so please create a new question.

Regards,

Faisal Hassan

Hi Faisal Hassan,

Here is new topic's link: http://e2e.ti.com/support/embedded/f/509/t/134487.aspx

Thank you.