SPI Flash/Touch

rcH4x0r,
I noticed you configured the SPI Flash for Mode 3 (CPOL=1, SCLK is '1' on idle) whereas the SPI Touch module seems to need Mode 0 (CPOL=0, SCLK is '0' on idle). Is this based on observation or just what you had and it worked? The SST chip supports either mode, but when I set CPOL=0, the flash stopped responding (and the touch screen DIDN'T start responding any better) so I guess it isn't quite that simple. The code I have now toggles PenIRQ on touch/release, which is good, but I'm not getting any data back from the TSC2008 on the serial bus so far.

I don't think my logic analyzer is fast enough to capture the SPI traffic from the stock firmware, and I'm not really sure what I am doing wrong.

I figured it out. the PSI1 was indeed misconfigured. I had to set both CPOL=0 and CPHA=0, and then configure the PenIRQ as internal pullup, and then I was able to read from the touch sensor.

Yep, X, Y, and Z are working (Z looks a little funny, I'm not sure the pressure sensor actually works properly to be honest)

Edit: I didn't write the mapping routines to convert the raw data to pixel coordinates yet, but that is pretty easy. What I am not sure of is whether we need a calibration setting or if all the Devo-8 Tx's can get by with the same calibration values.

I didn't spend much time on it. It is pretty easy to manage the touch sensor so there was no need for reverse engineering. There are several standard calibration routines out there, so I'll probably just pick one. I'm currently only using 8-bit mode and letting the sensor do the noise-reduction. I need to see if that is sufficient accuracy/reliability or if I need 12-bit or averaging. Initial testing indicated that what I've got is probably good enough.

PhracturedBlue wrote: ....
Edit: I didn't write the mapping routines to convert the raw data to pixel coordinates yet, but that is pretty easy. What I am not sure of is whether we need a calibration setting or if all the Devo-8 Tx's can get by with the same calibration values.

If the LCD and touch-screen assembly has large tolerances, than it can be useful to calibrate each unit to hanlde those tiny buttons accurately...

P.S: You haven't send me the settings mapping program to play with!
I will be out from next tuesday to thursday...

FDR wrote:

PhracturedBlue wrote: ....
If the LCD and touch-screen assembly has large tolerances, than it can be useful to calibrate each unit to hanlde those tiny buttons accurately...

or we don't use such small boxed in our GUI...

P.S: You haven't send me the settings mapping program to play with!
I will be out from next tuesday to thursday...

umm..which setting mapping program are we discussing? I don't recall that discussion.

Oops!
Sorry my bad, rcH4x0r asked me to map the system settings with HIS tool...