kedei 3.5 inch spi tft lcd for raspberry pi pricelist

I got a Raspberry Pi for my birthday and I have no idea how to set up the touchscreen. I have looked at other tutorials to set the touchscreen up but none of the ones I found support my touchscreen. Please help me figure this out I"m a complete noob to the Raspberry Pi world.

The scaler chip don"t accept as proper HDMI signal when this one have around 12MHz (this is a pixel clock frequency for 480x320RGB - I think the scaler have lower-limit around 20-few MHz) and this exact frequency is calculated by xrandr .

But WHY it works with hdmi_cvt, well hdmi_cvt actually make the hardware to generate 47MHz pixel clock with 4-pixels-data per one physical pixel, the scaler chip detect this and display only every 4th pixel... (so the transferred image have actually 1920x320 resolution / 4x480=1920! )

When surfing for information on 3.5 ” TFT touchscreens for the Raspberry Pi,to improve the TinyLCD experience, I stumbled upon AliExpress where several shops offer a 3.5″ LCD TFT Touch Screen Display for incredible low prices.

So I ordered two for the price of $14,85, postage included. A acrylic case and stylus is also included in that price! The shop Soonics has good reviews, but you  never know if one can trust that.

Here my experiences with the screen: quite slow refresh, not too high contrast, crisp screen, touch works, software works but is already outdated, but considering the price this screen is well worth the money! If I compare it to the NeoSec screen it is a better deal for applications with a high contrast theme and no demand on smooth video.

So now for the test. On the sellers page an URL is placed to get the software, on a Google drive. Not a clickable url, but an image with a long filename to type over …. Oh well, I got the archive.

Update June 2016: There is now a download/information page at http://osoyoo.com/driver/rpiscreen.php. Images for more versions (mine i 2.0, latest is 6.2)  are available there. Alternative ishttp://kedei.net/raspberry/raspberry.html with Kali Ubuntu drivers too for version 3.0 and up.

The archive contains an image of Raspbian with the LCD driver installed. The image is quite current, and fit for B, B+ or 2 B. When I bought the screen an older image, build in augustus 2015,  was downloadable, the kernel is quite fresh built, early October 2015.

The image supplied is wheezy,  3.18.9-v7 #27 SMP PREEMPT Sun Oct 4 23:57:41 CST 2015 armv7l. So quite a recent system! Also the Model 1 B and B+ kernel is present, also just current wheezy.

Now the bad news: no word how these kernels were build. So we are stuck with wheezy for now until the Chinese supply a more current build, hopefully based upon jessie. Until then: be careful updating the system by holding back on kernel updates.

The system uses SPI to copy the screen contents to the LCD screen, and some GPIO’s for the touchscreen. Other GPIOs are free, and the connector construction  leaves these pins indeed accessible!

I had in plans to create a custom driver but I decided this is not worth my time. I"m going to "re-interface" this lcd to be supported by fbtft. I have a prototype pcb with fbtft-spi interface ready (I have to send this project to pcb prototype service).

Unfortunatly, because of my "spider-circuit" I"ve broken my lcd (I"ve made a some short