Dazzler with 1920x720 output

[desiredshoe]

Just bought a Dazzler to play around with and was wondering if it had the capability to output 1920x720 by overclocking/firmware modding? 

[desiredshoe]

Thanks for all the help everyone, I really appreciate it!    /s

[mattp]

If you look in the EVE Programmers guide it has details of the commands to initialise to different resolutions

MCU_SPI_CLK_Freq(<11MHz);//use the MCU SPI clock less than 11MHz
host_command(CLKEXT);//send command to "CLKEXT" to FT81X
host_command(ACTIVE);//send host command "ACTIVE" to FT81X
/* Configure display registers - demonstration for WQVGA resolution */
wr16(REG_HCYCLE, 548);
wr16(REG_HOFFSET, 43);
wr16(REG_HSYNC0, 0);
wr16(REG_HSYNC1, 41);
wr16(REG_VCYCLE, 292);
wr16(REG_VOFFSET, 12);
wr16(REG_VSYNC0, 0);
wr16(REG_VSYNC1, 10);
wr8(REG_SWIZZLE, 0);
wr8(REG_PCLK_POL, 1);
wr8(REG_CSPREAD, 1);
wr16(REG_HSIZE, 480);
wr16(REG_VSIZE, 272);
/* write first display list */
wr32(RAM_DL+0,CLEAR_COLOR_RGB(0,0,0)

I'm guessing you'll need to change the firmware verilog to adjust clocks and such like?


www.ftdichip.com/Support/Documents/ProgramGuides/FT81X_Series_Programmer_Guide.pdf

[avanti]

Jul 5, 2021 2:33:07 GMT -8 mattp said:

If you look in the EVE Programmers guide it has details of the commands to initialise to different resolutions

MCU_SPI_CLK_Freq(<11MHz);//use the MCU SPI clock less than 11MHz
host_command(CLKEXT);//send command to "CLKEXT" to FT81X
host_command(ACTIVE);//send host command "ACTIVE" to FT81X
/* Configure display registers - demonstration for WQVGA resolution */
wr16(REG_HCYCLE, 548);
wr16(REG_HOFFSET, 43);
wr16(REG_HSYNC0, 0);
wr16(REG_HSYNC1, 41);
wr16(REG_VCYCLE, 292);
wr16(REG_VOFFSET, 12);
wr16(REG_VSYNC0, 0);
wr16(REG_VSYNC1, 10);
wr8(REG_SWIZZLE, 0);
wr8(REG_PCLK_POL, 1);
wr8(REG_CSPREAD, 1);
wr16(REG_HSIZE, 480);
wr16(REG_VSIZE, 272);
/* write first display list */
wr32(RAM_DL+0,CLEAR_COLOR_RGB(0,0,0)

I'm guessing you'll need to change the firmware verilog to adjust clocks and such like?


www.ftdichip.com/Support/Documents/ProgramGuides/FT81X_Series_Programmer_Guide.pdf

Are the above values the recommended ones for the Dazzler?  Where did they come from?

[mattp]

They are the example from the EVE programmer's guide.

If you look in the dazzler code. github.com/jamesbowman/gd3x-dazzler/blob/master/firmware/makeboot.py



def setup_1280x720(self):
self.Clear()
self.swap()
setup = [
(eve.REG_OUTBITS, 0),
(eve.REG_DITHER, 0),
(eve.REG_GPIO, 0x83),
(eve.REG_CSPREAD, 0),
(eve.REG_PCLK_POL, 0),
(eve.REG_ADAPTIVE_FRAMERATE, 0),
]
for (a, v) in setup:
self.cmd_regwrite(a, v)

self.video_signal(
h_Active = 1280,
h_Front = 110,
h_Sync = 40,
h_Back = 220,
h_Total = 1650,
v_Active = 720,
v_Front = 5,
v_Sync = 5,
v_Back = 20,
v_Total = 750)
self.w = 1280
self.h = 720


You can build a new firmware yourself and add it to the menu to try things out.

[armadafg]

Jun 1, 2021 16:16:41 GMT -8 desiredshoe said:

Just bought a Dazzler to play around with and was wondering if it had the capability to output 1920x720 by overclocking/firmware modding? 

Hi,


Basically, with the GD2 library, the frequency of the BT81x chips is 60Mhz.

Except in order to be able to generate 1.38 Mega pixel (1920 * 720 = 1382 400) at 60 images per second, it is necessary to increase the frequency to 72 Mhz.

But I can't find the right commands.

Therefore in 1.4Mega pixel the display frequency drops below 60hz.

for example if you have:
h_Active = 1280,

h_Front = 110,

h_Sync = 40,

h_Back = 220,

h_Total = 1650,

v_Active = 720,

v_Front = 5,

v_Sync = 5,

v_Back = 20,

v_Total = 750

1650 * 750 = 1 237 500 (the total number of pixels generated by the gpu)
60 000 000 / 1 237 500 =48.48

you will therefore have 48 images per second with its settings.
But with the BT815 to the BT818 it is possible to go from 60Mz to 72Mz (and even more with overclooking, but hardware modification is necessary)


So if I calculate them with 72Mhz :

72000 000 / 1 237 500 =58.1
So 58 images per second with its settings.


Another method will also be to reduce to a minimum of inactive mixel by minimizing the difference between Active and Total seting.  (for v and h)

[armadafg]

I will also be working on an SLI system between two or more BT 818, or 817, whatever.
So I could go up to 1080p and have more performance if I put more than 2 chips.
My goal is to have 1080p in 120hz in HDMI