DM365 LCD interface using parallel RGB

Asif,

I don't think the code will be available. Why are using EMIF bus? Why can't you use VPBE parallel RGB bus?

Hi Renjith

Our LCD display will not support VPBE parallel RGB BUS. our lcd details 

http://www.newhavendisplay.com/app_notes/ILI9341.pdf

I am new to this dm365 lcd please help us to solve this issues.

Regards

Asif

Asif,

You LCD supports both LCD mode and parallel RGB mode. Please refer to 

7.2. RGB Interface
7.2.1. RGB Interface Selection

for the info on how to use parallel RGB mode. 

Renjith,

our hardware dm365 will only support EMIF interface with chip select 1.  8 bit data to LCD.

Please refer to 7.6.3  (ili9341.pdf)

our LCD module no rk032fh063

Regards

Asif

Renjith,

I am enclosing our LCD file RK032FH063.PDF

for driver the  reference  file ILI9341.pdf file

8358.RK032FH063.pdf

if you went i can come on skype id also.

Regards

Asif

Asif,

You can use the EMIF bus, but you'll have to create your own driver for the same. You'll have to write a remote framebuffer driver for using this. You'll have to use EDMA driver for transferring data to the remote GRAM buffer. I recommend the second way(pRGB) as easier and better performing. 

Renjith,

To use second option our hardware will not support.

  Do you have any sample code for EMIF bus for chip select 1.  which i will modify and used.

Regards

Asif

Asif,

I don't have anything readymade with me. But you can easily use EMIF. Its just the matter of configuring pinmuxes and 3-4 registers in EMIF. But the framebuffer driver on top of this would need more code. 

Hi Renjith,

       We thought of using character device /dev/mtd0 or /dev/mtd1 ..etc... for driving the LCD which is connected on the same pins as the NAND Flash, with the following mapping:

                  EM_D[7..0] =>   LCD_DB[7..0]

                  EM_CE1     =>   LCD_CS

                  EM_WE       =>   LCD_WR

                  EM_OE        =>   LCD_RD

                  EM_A1         =>   LCD_RS

                  EM_A2         =>   LCD_RESET

       Is it possible to have the above mapping to work. If not please suggest other options.

       How to know he mapping of /dev/mtd(x) to memory addresses.

regards,

Asif

Asif,

You cannot use mtd driver or your display driver. You'll have to create a framebuffer driver manually to use the memory mapped address buffer. I don't know how to explain this to you, but whatever you are trying currently is not correct.

Hi Renjith

To checking  I am direct accessing  memory address  and loading the data.

off_t target  = 0x04000000; //emif address

main()

{

   int fd1;

   char *map_base;

   if ((fd1 = open("/dev/mem",O_RDWR)) == 0)

  {

           return -1;

}

map_base = (char *)map(0,MAP_SIZE,PROT_READ | PROT_WRITE,MAP_SHARED,fd1,target&~MAP_MASK);

if(map_base == (void *) -1)

{

  return -1;

}

while(1)

{

   map_base[0]= 0x55;

}

return;

}

with this code I am  able to see data line from CRO.

is it correct direction what we are doing ?

Regards

Asif

}

Asif,

No, you are not going in the right direction. You'll have to create a map in the kernel using ioremap and try to write into the buffer. Before that you'll have to initialize the display properly. Once the display is initialized properly, you've to see whatever data you write is getting reflected in the panel or not.

Hi Renjith

we are using new 320x240 RGB format lcd from u-boot we are able to  draw the lines. But we are not able to display correct images on lcd it will display junk.

Any input on this.

Regards

Asif

Hi Renjith

we are able to display the bmp image on lcd display but it is displaying only 1/4 image.



Regards
Asif

Hello

We are able to develop and the load the driver for lcd module. we are able display the image on the lcd using driver but it is display only 1/4 image any idea on this. when we  tryed to  display one dot it is display 4 dot any idea on this. This is same from u-boot and driver level.

Please help us to fixed this issues.

Regards

Asif

Hello

Enclosing Image original image and lcd image 

This is original image 320 x 240

This image is on lcd

The problem is in original image 1/4 is cat image other place it is black color  but i will take only if the image is at bottom right side. else it will not display any image on lcd. why ?

Regards

Asif

hi, ASIF

we are going to do the same thing as you do and want to know if it''d done.

regards, Mike

Hi Mike

Yes you can follow it will work. only I am facing  one  problem. it is displaying 1/4 image it is not display full image. At present I am busy with other project  may be after   10 days. i will work on this  display  problem to display  full image on lcd 320 x 240.

if you are able to fixed the issues to display full image please let me know. 

Regards

Asif

Hi Mike

you are able to fixed this issues.

We are able to fixed this issues now the display is working. On both  video and osd

Regards

Asif