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The bootloader of Trizeps VI and Trizeps VII can show a PNG-picture-file as splash-screen on the boot. For Trizeps VI you need to call the PNG in the autoboot.bat-script; i.e.:

boot mmc boot.png

For Trizeps VII you simply need to name the PNG boot.png and copy it to the boot SD-Card.

Samples for Trizeps-VII can be taken from this Archive: bootpngs-tr7.zip

Parameters

The display-timing configuration is stored in tEXt-chunks of the PNG-file. The horizontal/vertical size of the display is defined by the PNG-resolution.

Display

Parameter

Description

DisplayName

A string containing the display-name

VSyncWidth

Vertical Sync Width in HSync-Pulses.

VBackPorch

Vertical Back Porch in HSync-Pulses; Pulses between VSync and first line.

VFrontPorch

Vertical Front Porch in HSync-Pulses; Pulses after last line and next VSync.

HSyncWidth

Horizontal Sync Width in PixelClock.

HBackPorch

Horizontal Back Porch in PixelClock; Clocks between HSync and first pixel.

HFrontPorch

Horizontal Front Porch in PixelClock; Clocks after last pixel and next HSync.

PixelClock

PixelClock in Hz.

PClkUp

Advanced Setting: Time in ns before PixelClock goes high.

PClkDown

Advanced Setting: Time in ns after which PixelClock goes low.

SyncPolarity

 Bitmask:
 0x02  : Pixel-Clock-Polarity ( 0: falling edge, 1: rising edge)
 0x04  : HSync-Polarity ( 0: active high, 1: active low)
 0x08  : VSync-Polarity ( 0: active high, 1: active low)
 0x10  : DENA-Polarity  ( 0: active high, 1: active low)

Module/Baseboard

Parameter

Description

Bpp

Bit-Depth, Used in RGB-mode to define how many display-data-lines are used (16,18 or 24)  
This is the Bit-Depth of the physical interface. You may need to adjust the framebuffer-
format, the OS uses. i.e. Trizeps VII:
[HKEY_LOCAL_MACHINE\Drivers\Display\DDIPU]
   "Bpp"= 16 (Default), 24 (for 18 and 24Bpp)

Port

1:VGA
2:LVDS1, 3:LVDS2, 4:DLVDS                                      
5:TV,	
6:RGB-Interface (default)
7:DVI, 8:HDMI

EnablePin

SODIMM-Pin which is connected to the display enable pin.

BacklightPin

SODIMM-Pin which is connected to the backlight enable pin.

BacklightPwm

SODIMM-Pin which is connected to the backlight PWM pin. Note that if PWM-function is not availlable on this pin, normal GPIO-function is used.

Processor (Trizeps VII)

Parameter

Description

BufferStrength

 DriveStrength of display-pins:                                
 0: Hi-Z
 1: 240Ohm
 2: 120Ohm
 3: 80Ohm
 4: 60Ohm
 5: 48Ohm
 6: 40Ohm
 7: 34Ohm

ClkSource

Advanced Setting: 0=Internal Clock, 1=External Clock

Set GPIOs with bootloader (Trizeps VII)

Parameter

Description

EarlyResetPin

set GPIO to LOW before initialize display multiple SODIMM-Pins you can separate with line break

ResetPin

set GPIO to LOW after initialize display multiple SODIMM-Pins you can separate with line break

EarlySetPin

set GPIO to HIGH before initialize display multiple SODIMM-Pins you can separate with line break

SetPin

set GPIO to HIGH after initialize display multiple SODIMM-Pins you can separate with line break

Other Settings

Parameter

Description

acTL : Number of Plays

0: Loop. 1: Play one time 0..100%

BootAnimationDivide

How much of the animation is shown in bootloader (Default 25 → 25%)

Values only used by Operating System

Parameter

Description

Angle

Sets [HKEY_LOCAL_MACHINE\Drivers\Display\Default] Angle. Primary rotate-value of display.

Angle2

Sets [HKEY_LOCAL_MACHINE\Drivers\Display\Default] Angle2. Secondary rotate-value of display.

Note: Case of the letters in parameter-words is important!
On default numbers are entered decimal.
Prepend 0x to a number, if you want to enter hexadecimal numbers.
To invert the polarity of a SODIMM-Pin-function, add 0x100 to the pin-number.

Animated PNG (APNG)

The bootloader is capable of showing animated PNGs during boot.
Note that the bootloader can only animate while loading the OS-image. After the bootloader passed its control to the OS, animation stops.
See APNG_Specification for more details on APNG.

When you set the num_plays parameter of acTL to 0 (infinite loop) the animation will show the frames of the png-file in a loop while loading the OS.
A fixed time and not the delay-parameters of the APNG is used!
When you set the num_plays parameter of acTL to a non-zero value, the animation will show the OS loading process.

Extra Notes

Trizeps VII

dual/quad

In the current implementation L_BIAS / Data_Enable Signal will toggle multiple times during HSync, if PixelClock is not set to a value of 264MHz/n.

Sample PixelClock Frequency

n

Frequency

6

44000000

7

37714285

8

33000000

9

29333333

10

26400000

11

24000000

12

22000000

single/dual light

In the current implementation L_BIAS / Data_Enable Signal will toggle multiple times during HSync, if PixelClock is not set to a value of 198MHz/n.

Sample PixelClock Frequency

n

Frequency

4

49500000

5

39500000

6

33000000

7

28285714

8

24750000

9

22000000

Tools

  • TweakPNG is a tool to modify PNG-chunk-data; including tEXt-chunks.

  • RealWorld Paint is a paint program which can create APNG-files.

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