"Setup each one to draw 1/4 of the screen(540p). Set the front/rear porch times for each one so that each 1/4 screen is offset in the overall frame(1080p) position."

That's what I missed.

Thank you very much, I do not know when I will test it but there is a good chance that it will happen

Yes, I would like to be able to capture the video output of the BT815.

And why not use it as an HDMI arduino graphics card. But it's segundary.

The problem is that the maximum definition of BT815 is 800 * 600 or 1280 * 800 ( https://brtchip.com/Brochures/BT815_6%20Demosheet.pdf )
and not 1920*1080.
but it's not a major problem.

I'm thinking about how to couple 4 bt815 that can display 1080p but I do not see how to do. It could be super cool

Hi everybody,

I will need to pass the image of the BT815 on a HDMI or VGA cable.
is there a solution to this problem?
It should transform the 40pin parallel RGB image to HDMI or VGA.

I heard about the screen drivers but I did not find anything about it.

Thank you in advance for your help.

thank you for your reply,

I add:

 MCU_PDlow();                                                                // PD low to reset device                                                               
    MCU_Delay_20ms();
    MCU_PDhigh();                                                               // PD high again
    MCU_Delay_20ms();

And without:
GDTR.hostcmd(0x44);
GDTR.hostcmd(0x61);
GDTR.hostcmd(0x62);

I also lower the speed of the SPI to 11Mhz.

The REG_ID is the value 0x7c and 0x00 for the REG_CPURESET
The result on the screen is the same.

Thank you for your reply.

I use a teensy board for the CPU here.

if you inform me that the basic boot order is the same so my problem has to be in the hardware.

here are the diagrams of my prototype.
Will be very grateful if you took the time to see if all is well. I have already checked many times but it did not give anything
In the meantime I will check that I have correctly made my prototype

Hello,

I made myself a custom BT815 card and I can not make it work.
I do not know if it's the hardware or the software that does not work properly.

Regarding the hardware I base myself on the ft81x library.
I use the same screen with my ft811 but nothing happens. the slab of the screen is lit in black but nothing else. Backlight does not light.

I have not stopped rereading the Programmers Guide of ft81x and bt81x but I do not see what needs to change to set, start and turn on the screen in white.

Can you confirm that nothing changes for basic setup and parametrage instructions.

thank you very much in advance

So if I understand correctly the maximum PCLK speed available for the BT815 (36Mhz) is lower than that of the ft81x (60Mhz) .

So for what reason it is said that it is possible to make HD with the bt815 on the PDF available on your web site? How is it possible ?

Thank you for your reply.

OK so if I understand well. If I put the screen that I shared with you just before it will be possible to pair it with the BT815 with 40pin RGB connector and set parameters :

   lcdWidth   = 1024;                                                            // Active width of LCD display
   lcdHeight  = 600;                                                            // Active height of LCD display
   lcdHcycle  = 1114;                                                            // Total number of clocks per line
   lcdHoffset = 90;                                                             // Start of active line
   lcdHsync0  = 0;                                                               // Start of horizontal sync pulse
   lcdHsync1  = 48;                                                            // End of horizontal sync pulse
   lcdVcycle  = 610;                                                           // Total number of lines per screen
   lcdVoffset = 10;                                                            // Start of active screen
   lcdVsync0  = 0;                                                              // Start of vertical sync pulse
   lcdVsync1  = 3;                                                              // End of vertical sync pulse
   lcdPclk    = 1;                                                                  // Pixel Clock
   lcdSwizzle = 0;                                                              // Define RGB output pins
   lcdPclkpol = 1;                                                              // Define active edge of PCLK

HCYCLE = 1114
VCYCLE = 610
VCYCLE * HCYCLE  = 679,540

Result = 30,000,000/679,540 = ~ 88 fps

Yes I am also looking to exceed 60 fps