1st sound round for XPT2046 module.

[allObjects]

On branch xpt2046

Changes to be committed:
new file: datasheets/XPT2046.pdf
new file: devices/XPT2046.js
new file: devices/XPT2046.md

[allObjects]

Hi Gordon,

thanks for your personal lines and the gift with the last Tindie shipment. I means a lot to me - especially since I know that time is of the most precious good.

This - finally my first, hopefully complete - module request is for more to come: the ui modules that I announce a bit ago. I have them reworked/refactored back and forth and feel pretty ready to push them, because recent refactorings ended pretty much with the same code...

When I looked into the available ADS7843 resistive touchscreen controller, it was just not accurate enough... actually very off... depending on the orientation of the touchscreen in regard to top/left 0/0 coordinates. I published in the forum about it when I had to adopt a new display and touchscreen because the (ada)fruit one went bad with just sitting around... May be later I will also pub the resistive touchscreen Espruino-controller module, but it has lower priority compared to the ui modules.

The XPT2046 chip is from what I can see just a knockoff/rename/rebrand of the ADS7843 chiop... because it works with the ADS7843.js module.

For the XPT2046.md I have added a image, but just noticed that I forgot to 'pull it into' the md file... so you will see a second PR.

Furthermore, the .md inlcudes code for the calibration of the XPT2046 touchscreen controller. I hope it is in the right place (and format). If not let me know where to put...

Best regards, and thanks again for all your hard work

• markus

PS did hear back from the Espruino pep / lightning talk application at the Stanford IT UnConference on Dec 8, mentioning, that it is still very early in planning state and I would be notified down the (time) line...

[allObjects]

Gordon, do not merge the pull request yet... some textual changes are still under way.

[gfwilliams]

Hi, no problem! I really appreciate the hours it must take you to help people out on the forum :)

What you've done looks great - just let me know when you're ready to merge.

If you could link to /ADS7843 (the existing ADS7843 page) at the top, and cross-link back to your page from ADS7843.md, that would be really handy though - it might help people find your module if they were searching for the basic ADS7843.

I future, I'd try and avoid duplicating functionality wherever possible though. For other things, if there's an existing module, generally it's better to modify it to work better (even if that means re-writing but providing a fallback for existing users).

[gfwilliams]

Hi - just wondering - are you ready for me to merge this in yet?