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notro / fbtft

Linux Framebuffer drivers for small TFT LCD display modules. Development has moved to https://git.kernel.org/cgit/linux/kernel/git/gregkh/staging.git/tree/drivers/staging/fbtft?h=staging-testing
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RA8875 ER-TFTM070-5 Rpi 3 with newest rasbian #474

Closed sonic2wb closed 7 years ago

sonic2wb commented 7 years ago

So I wired up the display but theres no RS (aka d/c) pin. unless i am missing something. When i modprobe the driver the screen lights up and u can see the frame buffer fill the screen with black lines. dmesg so the display is detected. then i run the startx command and the desktop appears on the display but only the right half of the display works. I can see the mouse and can click on the wifi icon and date and time. u can even kinda see the start menu trying to be drawn behind this White block.

if u run it in console that white box is now black and the console text scrolls up behind it. its driving me crazy!! I thought at first the lcd was bad but I hooked up my arduino mega and all the test apps run just fine. and the display shows just fine.

any ideas? 20472573_10155520696251064_285916991_o

notro commented 7 years ago

I don't know how you power the display, but if you power it from the Pi you will probably run into strange issues due to undervoltage. I found this: https://github.com/sumotoy/RA8875/wiki/EastRising-and-Buydisplay-SPI-configuration-and-wiring

sonic2wb commented 7 years ago

Thanks for the reply. i am still getting that white block. in front of the left side of the screen. it seems it is something in my display i even did the framebuffer copy from the wiki and it works except for that dang white box here is a better picture showing the mouse pointer . only other thing i know to do is try the fix in issue 96 if i can figure out how to compile drivers on the pi...... 20502598_10155524092616064_1758497708_o

sonic2wb commented 7 years ago

i ment issue 176

sonic2wb commented 7 years ago

built a new driver with the fix from issue 176 i still have the box on the left side. it seems to be something in the int of the display. If i hook display to my arduino all the code and all of the display works just fine. I gave screen its own power source etc.. Guess ill just have shelve the display for now..

sonic2wb commented 7 years ago

The only other thing i can think of is this display doesnt have a D/C pin? unless i am just missing it. i have the reset pin on gpio 25. oh and another note is the screen saver works on the frambuffer the screen goes all black.

sonic2wb commented 7 years ago

It works! the patch in #176 did the trick. took a bit of time and research but i was able to compile a new ra_8875.ko and install it into my rasbian install. also did some testing my display works great at 24khtz

20472491_10155524347406064_1495793531_o

sonic2wb commented 7 years ago

I will post a link to instructions and to the modified fb_ra8875.c file later today. I hope its possible to add the patch to the kernel source so on the next kerel update i wont have to rebuild the module.

notro commented 7 years ago

I'm no longer a maintainer of fbtft. https://github.com/notro/fbtft/wiki/Development