Re: [Gumstix-users] A/D reading using ConsoleVX-LCD

[Dave H. <dhy...@gm...>]

Hi Haritz,

On Tue, Oct 28, 2008 at 5:42 AM, Haritz <hza...@fa...> wrote:
>
> Hi!
> I want to read the A/D register from the TSC2003 Touch Screen Controller.
>
> I have read these posts,
> http://www.nabble.com/I2C-Setup-for-Verdex-td18807158.html
> http://www.nabble.com/tsc2003-userspace-driver-td18834088.html
> and
> http://www.nabble.com/Help%3A-i2c-with-console-vx-td17563347.html#a17563347
>
> but I don't know how to find the address of the register where the data is
> stored.

This page:
<http://focus.ti.com/docs/prod/folders/print/tsc2003.html>
hasa link to the datasheet for the TSC2003. Page 16 shows the
"register map" (aka commands).

> I think it is  0x0A, but I don't know for sure and I don't know where to
> find it.

That seems incorrect according to the datasheet.

> The dmesg says that the tsc2003 i2c address is 0x48. See attached dmesg
> output. http://www.nabble.com/file/p20206503/consoledmesg.txt
> consoledmesg.txt
>
> Whenever I try to access the tsc2003 using the i2c program written by Dave
> Hylands, I get the following error...
> i2c 0x48 RecvByte2
> ERROR: I2cSetSlaveAddress: Error trying to set slave address to 0x48 (16
> Device or resource busy)
> 0x3b3b
>
> How can I solve this?

I think that once a proper driver is loaded and claiming a given
address, then the i2c program can no longer be used to access that
device. You need to use the driver for the device in question.

I believe that you could unload the tsc2003 driver and then be able to
use the i2c utility.

--
Dave Hylands
Shuswap, BC, Canada
http://www.DaveHylands.com/