Re: Touchscreen chip is not an ADS 7846

Hello Pierre,

Monday, January 29, 2007, 9:26:04 PM, you wrote:

[]
>> Yes, I refactored it exactly for your use, and I'd appreciate if you
>> give it try (and win ;-) ). Please see h4000 code fro how to use it
>> (pretty simple actually, you just need to pass in pen down IRQ).
>>
>> I also confirmed that ADS7846 and TSC2046 are exact clones. Quoting
>> doc:
>> "The TSC2046 is 100% pin-compatible with the existing
>> ADS7846, and will drop into the same socket."
>> They talk about pin compatibility here, but looking at command bits,
>> programmatical interface is the same too. So, this is great news,
>> meaning that the whole dozen of PDAs can use the same driver. I will
>> try ads7846ts_ssp on hx4700 as the next thing to do too.
>>
> ok : go for it, then :-)
> Just a question : do you have any idea of the transfer laws to be used ?
> I get some really non-linear measurements...

  Well, ads7846ts_ssp contains all required filtering and debouncing
to get stable "raw" readings (the same algorithm works well on h1910,
h4000, asus716). These raw reading are processed by library called
tslib, which works in userspace and applies needed affine
transformation to get actual LCD-aligned readings. All software which
needs touchscreen input interface to tslib.

>>
>>> Could you please commit the following modification to
>>> include/asm-arm/arch-pxa/memory.h ?
>>>
>>> #ifdef CONFIG_DRAM_BASE
>>> #define PHYS_OFFSET (CONFIG_DRAM_BASE)
>>> #else
>>> #define PHYS_OFFSET UL(0xa0000000)
>>> #endif
>>>
>>
>> Committed. So, can you confirm that with this modification CVS can
>> build bootable kernel for aximx50? It's time to tag next subrelease,
>> and I'd like to include working aximx50 into it.
>>
> It is ok. The HEAD kernel boots and the pxafb is working on my X51v.

  Perfect, thanks!

> Tests should be done also on X50, X50v and X51...

> Jean-Nicolas : could you build and host this kernel image ?

> Pierre

-- 
Best regards,
 Paul                            mailto:pmiscml_at_gmail.com