nanogui: ADS 7843 Touchscreen Solved ! Touchscreen issues and queries
Subject:
RE: [nanogui] ADS 7843 Touchscreen Solved ! Touchscreen issues and
queries
From:
Junior ####@####.####
Date:
1 Jun 2007 16:41:22 +0100
Message-Id: <23748F90574.00000219ejr@inbox.com>
> -----Original Message-----
> From: ####@####.####
> Sent: Fri, 1 Jun 2007 11:08:10 +0200
> To: ####@####.####
> Subject: [nanogui] ADS 7843 Touchscreen Solved ! Touchscreen issues and
> queries
>
> Hello,
>
> Thanks for all the replies, but there is still some obscure things I
> would like to enlighten... First, I have made many printk in evdev.c,
> tsdev.c, input.c and mousedev.c files which are in ../linux/drivers/input
> I've put traces in the event, open, close, read, write, and connect
> functions.
> It seems that evdev.c, tsdev.c and mousedev.c are connecting at the
> launch of µCLinux in the target. Without executing nano-X server, there
> is only input.c replying and after executing nano-X server, I can see
> traces in mousedev.c and input.c at the open functions and others in read
> and event functions when I touch the screen. It proves that there is a
> link between nano-X and the drivers in the kernel.
> My first question is why did tsdev and evdev not open ? Isn't tsdev
> supposed to interface with the touchscreen ?
> Then I've also put traces in mou_touchscreen.c which is in
> ../microwindows-0.90/src/drivers and devmouse.c in
> ../microwindows-0.90/src/engine I can see traces in devmouse.c when I
> touch the screen.
> I saw in the previous message from Kelvin that I had to adapt the
> structure for the ADS7843 so I modified the touchscreen_ads7846.h file
> and wrote :
>
> #ifndef TS_DEVICE
> #define TS_DEVICE "ADS7846"
>
> #define TS_DEVICE_FILE "/dev/event0"
>
> struct ts_event{
> short pressure;
> short x;
> short y;
> short dumy;
> };
>
> #endif
>
> My next question is why can't I see anything from mou-touchscreen.c ?
> I've also commented out the filter_transform function but I see nothing..
> So, does the touchscreen really act like a mouse ?
I've used the ADS7843 a while back and I used my tslib patch I posted some time back.
You migh want to check the archives for it and may need to adjust your threshold.
--Jr.
