Touch Screen sensitivity

[Guest amdnikos]

Well overall as all of you have already noticed,liquid's touch sensitivity somehow cant compared with htc or motorolla (droid) sensitivity.Especially some days ago i had the luck to play a bit with a Nexus.I could interact with screen even if i didnt touch it!!i kept my finger like 1mm away from screen.

My question is: Is that a driver or hardware issue the non good sensitivity compared with htc's android phones?

[Guest erto90]

Well overall as all of you have already noticed,liquid's touch sensitivity somehow cant compared with htc or motorolla (droid) sensitivity.Especially some days ago i had the luck to play a bit with a Nexus.I could interact with screen even if i didnt touch it!!i kept my finger like 1mm away from screen.

My question is: Is that a driver or hardware issue the non good sensitivity compared with htc's android phones?

a good part is driver issue...

[Guest chingy1788]

if you have the kernel source

its all in this file

<AcerKernelDir>\kernel\drivers\input\touchscreen\auo_ts.c

but we need some one to compile and test...

two things I would like to see

no midpoint when pressing 2 fingers

and sensitivity boost

both dont look hard to do

but pretty much all the devs are working on Android 2.1 beta... so we'll probably wont see these fixes any time soon

Edited February 25, 2010 by chingy1788

[Guest amdnikos]

if you have the kernel source

its all in this file

<AcerKernelDir>\kernel\drivers\input\touchscreen\auo_ts.c

but we need some one to compile and test...

two things I would like to see

no midpoint when pressing 2 fingers

and sensitivity boost

both dont look hard to do

but pretty much all the devs are working on Android 2.1 beta... so we'll probably wont see these fixes any time soon

well the midpoint matter is 100% software issue.Now about sensitivity tbh my opinion is prolly screen hardware issue because we ll had already a screen boost from a developer on donut os from a developer here since the kernel is out that long.

[Guest chingy1788]

well the midpoint matter is 100% software issue.Now about sensitivity tbh my opinion is prolly screen hardware issue because we ll had already a screen boost from a developer on donut os from a developer here since the kernel is out that long.

which kernel has that?

disc0 didn't mention that in his kernels

Edited February 25, 2010 by chingy1788

[Guest amdnikos]

which kernel has that?

disc0 didn't mention that in his kernels

maybe disco didnt,but overall capacitive screen technology supports multitouch.

[Guest chingy1788]

multi touch enabled kernel has been done by disc0

removing the mid point and using one finger point instead, will make typing on the keyboard easier

touch screen sensitivity, there are a couple of values that can be changed in the source to maybe up the sensitivity

i haven't read about any one trying that on these forums

[Guest Angio]

there is a settings where we can edit this, but i have not located it yet.... when i do, i will set that to MAX!!!!!!!!!

[Guest chingy1788]

i reckon its in this file

<AcerKernelDir>\kernel\drivers\input\touchscreen\auo_ts.c

#define SENSITIVITY_REG		  0x67

#define SENSITIVITY			  75

those are used by this function

static ssize_t set_ts_sensitivity(struct device *device,

			   struct device_attribute *attr,

			   const char *buf, size_t count)

{

	uint8_t sensitivity[3] = {SENSITIVITY_REG,ts_atoi(buf),ts_atoi(buf)};

	pr_info("[TS] Sensitivity : X = %d  Y = %d\n",sensitivity[1],sensitivity[2]);

	if (3 != i2c_master_send(h353_data->client, sensitivity, 3))

		pr_err("[TS] Set sensitivity error\n");

	return count;

}

I'm sure messing with those values will do something Unfortunately I have no idea on how to compile the kernel... Another thing to look at is

	if (!finger2_pressed) {

		/* No multitouch -- force width to zero */;

		width = 0;

		x = coord[0][0];

		y = coord[0][1];

	} else {

		/* (x,y) coords for multitouch are at midpt between fingers */

		x = (coord[0][0] + coord[1][0]) / 2;

		y = (coord[0][1] + coord[1][1]) / 2;


		/* Report the width according to the abs distance of x-axis */

		width = abs((coord[0][0] - coord[1][0]));

	}

If we make the driver report one finger's location instead of the mid point when two fingers are pressed, the keyboard should be easier to use (It's done this way on cyanogen's mod)

whether this is the right file to change or not, I don't know for sure

[Guest amdnikos]

i reckon its in this file

<AcerKernelDir>\kernel\drivers\input\touchscreen\auo_ts.c

#define SENSITIVITY_REG		  0x67

#define SENSITIVITY			  75

those are used by this function

static ssize_t set_ts_sensitivity(struct device *device,

			   struct device_attribute *attr,

			   const char *buf, size_t count)

{

	uint8_t sensitivity[3] = {SENSITIVITY_REG,ts_atoi(buf),ts_atoi(buf)};

	pr_info("[TS] Sensitivity : X = %d  Y = %d\n",sensitivity[1],sensitivity[2]);

	if (3 != i2c_master_send(h353_data->client, sensitivity, 3))

		pr_err("[TS] Set sensitivity error\n");

	return count;

}

I'm sure messing with those values will do something Unfortunately I have no idea on how to compile the kernel... Another thing to look at is

	if (!finger2_pressed) {

		/* No multitouch -- force width to zero */;

		width = 0;

		x = coord[0][0];

		y = coord[0][1];

	} else {

		/* (x,y) coords for multitouch are at midpt between fingers */

		x = (coord[0][0] + coord[1][0]) / 2;

		y = (coord[0][1] + coord[1][1]) / 2;


		/* Report the width according to the abs distance of x-axis */

		width = abs((coord[0][0] - coord[1][0]));

	}

If we make the driver report one finger's location instead of the mid point when two fingers are pressed, the keyboard should be easier to use (It's done this way on cyanogen's mod)

whether this is the right file to change or not, I don't know for sure

good job mate :( , it refers on multitouch too.

[Guest chingy1788]

Multi touch... kinda has been enabled

the driver only supports single touch right now (hence mid point, and width)

need alot of changes to get multi touch working...

right now with disc0's kernel theres pinch zoom support with dolphin browser

[Guest Squide]

Well overall as all of you have already noticed,liquid's touch sensitivity somehow cant compared with htc or motorolla (droid) sensitivity.Especially some days ago i had the luck to play a bit with a Nexus.I could interact with screen even if i didnt touch it!!i kept my finger like 1mm away from screen.

My question is: Is that a driver or hardware issue the non good sensitivity compared with htc's android phones?

I think this is related to the CPU speed.

When I use 1GHz kernel, the touch screen is more sensitive.

Edited February 26, 2010 by Squide

[Guest Quipeace]

The sensitivity might be set lower to hide the flaws of a cheaper/budget screen? Like to seperate the noise from actual touch.

I've made a LLP touch screen a year or so back and it required quite alot of filtering to get rid of the noise and while that is a whole different technique it does make sense right?

I suppose the only way is to test it, just make sure you aren't biased.

[Guest Angio]

does anyone know what will happen if noise is not matched with sensitivity?

[Guest chingy1788]

you will get random touches everywhere even though you didnt touch the screen