Flexfb for NT35310 and spi circuit

[mwilliams03]

Hi Notro I am trying to get this display working with flexfb; http://www.wayengineer.com/index.php?main_page=product_info&products_id=5475 It uses NT35310.

I have all the init registers and the init sequence and I am able to get the display initialized using my own SPI code. However, I would like to use it with fbtft, and use your spi circuit. When using flexb, how do you specify that you want to use the spi circuit?

[notro]

The speed= argument makes it a SPI device See: https://github.com/notro/fbtft/wiki/fbtft_device#wiki-custom-display

modprobe fbtft_device custom name=flexfb width=XX height=XX buswidth=XX speed=XX gpios=XX init=XX

[notro]

I'm sorry, but that was wrong, flexfb is a special case. This is hopefully more correct:

modprobe flexfb width=XX height=XX buswidth=XX regwidth=XX init=XX
modprobe fbtft_device name=flexfb [speed=] [gpios=]

fbtft_device flexfb defaults: https://github.com/notro/fbtft/blob/master/fbtft_device.c#L259

[mwilliams03]

Thanks, Notro. With the two lines below, I am able to get some information on screen. I can even see the cursor flashing.... however it isnt correct. Image below I'm not sure if the issue is my init sequence, or the parameters i am using for fbtft. Any assistance would be appreciated.

sudo modprobe flexfb  width=480 height=320 regwidth=16 init=-1,0x11,-2,250,-1,0X20,-1,0X38,-1,0X13,-1,0X29,-3
sudo modprobe fbtft_device debug=3 name=flexfb speed=16000000 gpios=reset:25,dc:24

BTW, what is regwidth used for?

[notro]

I have seen that before when I tried to discover the right register values to do rotation on a display I have. I guess it's an initialization problem. Your init sequence is the shortest I have ever seen. Where did you get it?

From product page

the drive IC: RM68042.

Looking at the datasheet, this is what you're init sequence does: 1,0x11, - Exit_sleep_mode -2,250, - Sleep -1,0X20, - Exit_invert_mode -1,0X38, - Exit_idle_mode -1,0X13, - Enter_normal_mode -1,0X29, - Set_display_on -3

No setup of power supply, size of panel etc.

BTW, what is regwidth used for?

This is the bit-width of the register in the LCD controller that we are writing to. it is 8-bit on RM68042

From datasheet

The RM68041 incorporates command method 18-/16-/9-/8-bits bus display command interface, which consists of 8 bits command registers and 8 bits parameter registers. Parameter registers consist of 8 bits write data register (WDR) and 8bit read data register (RDR).

[notro]

Closing issue since there has been no activity for more than 2 months. Reopen if needed.