MobileRead Forums - View Single Post - geekmaster touchscreen signature capture script

geekmaster · 10-06-2012, 05:02 PM

This program partially works on the Paperwhite, but has some issues that need fixing. The name of the touchscreen device changed from zforce to cyttsp, so I need to change the code that searches for it in the input devices:

I needed to change this:
DT=$(for i in /dev/input/event*;do evtest info $i|grep zforce>$DN&&echo $i&&break;done)

to this:
DT=$(for i in /dev/input/event*;do evtest info $i|grep -w "zforce\|cyttsp">$DN&&echo $i&&break;done)

Also, the eips text output needs to be reformatted. On the K5 and earlier you had 40 lines of 50 characters. But on the Paperwhite, you havee 42 lines of 48 characters. Not only is the line 2 characters narrower, but you can only see the left half of the last character on the line. So practically speaking, in text mode, the new higher resolution eink screen cannot display the rightmost 3 characters of lines that displayed fine on earlier kindles.

Here are the screen dimensions reported by eips:

Code:

[root@kindle root]# eips -i

Fixed framebuffer info
    id:              mxc_epdc_fb    smem_start:       0x75800000
    smem_len:            4718592    type:          PACKED_PIXELS
    type_aux:                  0    visual:   STATIC_PSEUDOCOLOR
    xpanstep:                  1    ypanstep:                  1
    ywrapstep:                 0    line_length:             768
    mmio_start:       0x00000000    mmio_len:                  0
    accel:                     0

Variable framebuffer info
    xres:                    758    yres:                   1024
    xres_virtual:            768    yres_virtual:           6144
    xoffset:                   0    yoffset:                   0
    bits_per_pixel:            8    grayscale:                 1
    red.offset:                0    green.offset:              0
    red.length:                8    green.length:              8
    red.msb_right:             0    green.msb_right:           0
    blue.offset:               0    transp.offset:             0
    blue.length:               8    transp.length:             0
    blue.msb_right:            0    transp.msb_right:          0
    nonstd:                    0    activate:                128
    width:                    -1    height:                   -1
    accel_flags:               0    pixclock:           40000000
    left_margin:              12    right_margin:             76
    upper_margin:              4    lower_margin:              5
    hsync_len:                12    vsync_len:                 2
    sync:                      0    vmode:                     0
    rotate:                    3
[root@kindle root]#

As you can see, it is 8 bits-per-pixel, just like the K4 and K5. It is not 4bpp as reported in another thread.

10-06-2012, 05:02 PM	#14
geekmaster Carpe diem, c'est la vie. Posts: 6,433 Karma: 10773668 Join Date: Nov 2011 Location: Multiverse 6627A Device: K1 to PW3	This program partially works on the Paperwhite, but has some issues that need fixing. The name of the touchscreen device changed from zforce to cyttsp, so I need to change the code that searches for it in the input devices: I needed to change this: *DT=$(for i in /dev/input/event;do evtest info $i\|grep zforce>$DN&&echo $i&&break;done) to this: DT=$(for i in /dev/input/event;do evtest info $i\|grep -w "zforce\\|cyttsp">$DN&&echo $i&&break;done)* Also, the eips text output needs to be reformatted. On the K5 and earlier you had 40 lines of 50 characters. But on the Paperwhite, you havee 42 lines of 48 characters. Not only is the line 2 characters narrower, but you can only see the left half of the last character on the line. So practically speaking, in text mode, the new higher resolution eink screen cannot display the rightmost 3 characters of lines that displayed fine on earlier kindles. Here are the screen dimensions reported by eips: Code: [root@kindle root]# eips -i Fixed framebuffer info id: mxc_epdc_fb smem_start: 0x75800000 smem_len: 4718592 type: PACKED_PIXELS type_aux: 0 visual: STATIC_PSEUDOCOLOR xpanstep: 1 ypanstep: 1 ywrapstep: 0 line_length: 768 mmio_start: 0x00000000 mmio_len: 0 accel: 0 Variable framebuffer info xres: 758 yres: 1024 xres_virtual: 768 yres_virtual: 6144 xoffset: 0 yoffset: 0 bits_per_pixel: 8 grayscale: 1 red.offset: 0 green.offset: 0 red.length: 8 green.length: 8 red.msb_right: 0 green.msb_right: 0 blue.offset: 0 transp.offset: 0 blue.length: 8 transp.length: 0 blue.msb_right: 0 transp.msb_right: 0 nonstd: 0 activate: 128 width: -1 height: -1 accel_flags: 0 pixclock: 40000000 left_margin: 12 right_margin: 76 upper_margin: 4 lower_margin: 5 hsync_len: 12 vsync_len: 2 sync: 0 vmode: 0 rotate: 3 [root@kindle root]# As you can see, it is 8 bits-per-pixel, just like the K4 and K5. It is not 4bpp as reported in another thread. Last edited by geekmaster; 10-09-2012 at 10:12 PM.