Untouched TouchScreen for Raspberry PI 2 pt1

And finally I have got a time to setup TouchScreen for my Rpi2. And I shat say that it wasn't easy.

What I have had:
- Rpi2
- 3.5" TFT LCD Touch Screen Module 320*480 RGB Display Board with logo of WaveShare SpotPear
http://www.wvshare.com/product/3.5inch-RPi-LCD-A.htm


I have found one article with tutorial http://www.circuitbasics.com/setup-lcd-touchscreen-raspberry-pi/. It uses common custom driver for Touch LCDs https://github.com/notro/fbtft/. But author of this article has different module with different controller.

But my module has XPT2046 controller and it requires slightly different setup command. Lets see those differences

$ sudo nano /etc/modules

	#original
	fbtft_device name=waveshare32b gpios=dc:22,reset:27 speed=48000000
	waveshare32b width=320 height=240 buswidth=8 init=-1,0xCB,0x39,0x2C,0x00,0x34,0x02,-1,0xCF,0x00,0XC1,0X30,-1,0xE8,0x85,0x00,0x78,-1,0xEA,0x00,0x00,-1,0xED,0x64,0x03,0X12,0X81,-1,0xF7,0x20,-1,0xC0,0x23,-1,0xC1,0x10,-1,0xC5,0x3e,0x28,-1,0xC7,0x86,-1,0x36,0x28,-1,0x3A,0x55,-1,0xB1,0x00,0x18,-1,0xB6,0x08,0x82,0x27,-1,0xF2,0x00,-1,0x26,0x01,-1,0xE0,0x0F,0x31,0x2B,0x0C,0x0E,0x08,0x4E,0xF1,0x37,0x07,0x10,0x03,0x0E,0x09,0x00,-1,0XE1,0x00,0x0E,0x14,0x03,0x11,0x07,0x31,0xC1,0x48,0x08,0x0F,0x0C,0x31,0x36,0x0F,-1,0x11,-2,120,-1,0x29,-1,0x2c,-3
	#my version
	fbtft_device debug=3 rotate=90 name=flexfb speed=30000000 gpios=reset:25,dc:24
	flexfb width=320 height=480 regwidth=16 init=-1,0xb0,0x0,-1,0x11,-2,250,-1,0x3A,0x55,-1,0xC2,0x44,-1,0xC5,0x00,0x00,0x00,0x00,-1,0xE0,0x0F,0x1F,0x1C,0x0C,0x0F,0x08,0x48,0x98,0x37,0x0A,0x13,0x04,0x11,0x0D,0x00,-1,0xE1,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0xE2,0x0F,0x32,0x2E,0x0B,0x0D,0x05,0x47,0x75,0x37,0x06,0x10,0x03,0x24,0x20,0x00,-1,0x36,0x28,-1,0x11,-1,0x29,-3

view raw modules hosted with ❤ by GitHub

$ sudo nano /boot/cmdline.txt

	# original
	dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait fbtft_device.custom fbtft_device.name=waveshare32b fbtft_device.gpios=dc:22,reset:27 fbtft_device.bgr=1 fbtft_device.speed=48000000 fbcon=map:10 fbcon=font:ProFont6x11 logo.nologo dma.dmachans=0x7f35 console=tty1 consoleblank=0 fbtft_device.fps=50 fbtft_device.rotate=0
	# my version
	dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait fbcon=map:1 fbcon=font:ProFont6x11

view raw cmdline.txt hosted with ❤ by GitHub

$ sudo nano /boot/config.txt

we use config.txt and device tree overlays because in actually firmware of Rpi2 no longer uses ads7846_device.
https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README

	# my version
	dtdebug=on
	dtoverlay=ads7846,penirq=17,speed=500000,swapxy=1

view raw config.txt hosted with ❤ by GitHub

so with those changes LCD screen works fine. But touch interface still doesn’t work I will do more investigations later, when I will get more free time. but if you have had same problem but now fixed it, please put comment here with right solution.

Links

http://www.waveshare.com/wiki/3.5inch_RPi_LCD_(A) - FAQ on site of