3.5 inch touch screen tft lcd for raspberry pi quotation

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Would you like the SPI kernel module to be loaded by default? YESS! thats what we wanted. Once done, exit the configuration menu and type in terminal command ‘sudo reboot‘; for the changes to take effect.Note:This method is applicable, only with the Raspbian version released after 1-31-2015.

Now we will have to configure the fbturbo video driverso as to change the video out from HDMI bus to SPI bus. For that, enter the following command in the terminal window:

After system reboot there wont be any output on the HDMI screen. So, to enter the further commands in the terminal we will have to use SSH method for remote connection to the Raspberry Pi board. Click here to see the steps on how to setup a remote connection.

Next step is to configure the kernel modules for the LCD and the touchscreen for which we need to edit the /etc/modules file. Use the following command:

Currently, the module for Raspberry Pi’s Broadcom processor snd-bcm2835 is set to load automatically. Add this code below the snd-bcm2835 line to support fbtft_device:

Some people seems to have issues with the touch panel,  having the y-axis inverted in X11. If you experience this problem all you have to do is modify the configuration file usr/share/X11/xorg.conf.d/10-evdev.conf. For that enter

3.5inch RPi LCD (A) and 3.5inch RPi LCD (B) are hardware compatible with each other (uses different driver), and can be mutually substituted in most cases. (A) for low cost ver. while (B) for IPS ver. with better displaying.

Why the LCD doesn"t work with my Raspbian?To use the LCD with the Raspberry Pi official image, driver (SPI touch interface only) should be installed first. Please refer to the user manual.

However, for the first testing, you may want to use our image directly (if provided).Why the LCD still doesn"t work with the Waveshare provided image?Make sure the hardware connection is correct and connects fine.

The PWR will keep on and the ACT will keep blinking when the Raspberry Pi starts up successfully, in case both of the two LEDs keep on, it is possible that the image was burnt incorrectly OR the TF card was in bad contact.Which power supply should I use?It is recommended to use a 5V/3A power adapter for the Raspberry Pi other than USB connection, otherwise the Pi may failed to start up because the PC"s USB port might have not enough power.

Since the first-generation Raspberry Pi released, Waveshare has been working on designing, developing, and producing various fantastic touch LCDs for the Pi. Unfortunately, there are quite a few pirated/knock-off products in the market. They"re usually some poor copies of our early hardware revisions, and comes with none support service.

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While googling for any info about lcd controller I came across this page: http://heikki.virekunnas.fi/2015/raspberry-pi-tft/, author managed to get from manufacturer patch file for kernel sources and tested it with 4.1.y - on which lcd worked. But still LCD replace HDMI, but I want to use this screen as additional for user interaction, while the bigger on HDMI as presentation monitor.

Since, fbtft has been merged with rpi kernel, so the fb drivers (including ili9341.c) was moved to fbtft_device driver (so the author of page can"t compile latest kernel with driver+patch).

So something about hardware, which I reverse engineered by the "hard way" - "grab multimeter and run through all LCD FPC pins and shift register pins"

Now I noticed there is "9486L" which can suggest that LCD screen is controlled by ILI9486L, I found this LCD on taobao too but I can"t contact seller.

I"m pretty sure about D/C (Pin 37 on LCD) and Reset (Pin 19 on LCD) pins by looking into driver code, but I can"t identify other signals (WR/RD/CS/etc...)

[ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2709.boardrev=0xa01041 bcm2709.serial=0x2938b030 smsc95xx.macaddr=B8:27:EB:38:B0:30 bcm2708_fb.fbswap=1 bcm2709.disk_led_gpio=47 bcm2709.disk_led_active_low=0 sdhci-bcm2708.emmc_clock_freq=250000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

[ 4.838806] input: MOSART Semi. Rapoo 2.4G Wireless Touch Desktop as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3:1.0/0003:24AE:1000.0001/input/input1

[ 4.862704] hid-generic 0003:24AE:1000.0001: input,hidraw0: USB HID v1.10 Keyboard [MOSART Semi. Rapoo 2.4G Wireless Touch Desktop ] on usb-bcm2708_usb-1.3/input0

[ 4.902783] input: MOSART Semi. Rapoo 2.4G Wireless Touch Desktop as /devices/platform/bcm2708_usb/usb1/1-1/1-1.3/1-1.3:1.1/0003:24AE:1000.0002/input/input2

[ 4.926400] hid-generic 0003:24AE:1000.0002: input,hiddev0,hidraw1: USB HID v1.10 Mouse [MOSART Semi. Rapoo 2.4G Wireless Touch Desktop ] on usb-bcm2708_usb-1.3/input1

- Controller is not ILI9341/ILI9325 - those are for smaller displays (320x240, etc...), I guess this might be ILI9486/9488 because they are for 480x320 displays. But when I compared init with DS it does not fit right so LCD can have a clone of ILI9486/9488 ...

- Module use only SPI interface and two CE signals (CE0 for touch controller, CE1 for LCD shift registers - compared to others lcd modules, in KeDei module this is swapped),

The PWR will keep on and the ACT will keep blinking when the Raspberry Pi starts up successfully, in case both of the two LEDs keep on, it is possible that the image was burnt incorrectly OR the TF card was in bad contact.

It is recommended to use a 5V/2A power adapter for the Raspberry Pi other than USB connection, otherwise, the Pi may fail to start up because the PC"s USB port might have not enough power.

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