7.1 Display configuration

35

 

field name

 

type

 

description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

name

 

string

 

used to identify the panel

 

pixclock

 

number

 

Divisor for the pixel clock. Generally

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 for QVGA, 1 for higher resolution.

 

xres

 

number

 

Horizontal pixel count

 

yres

 

number

 

Vertical pixel count

 

act

 

 

high

 

number

 

Clock polarity, 0 (default) or 1

 

 

 

 

hsync

 

 

 

 

len

 

number

 

Horizontal sync pulse

 

 

 

 

 

 

left

 

margin

 

number

 

Idle pixels before leftmost pixel

 

 

 

right

 

 

margin

 

number

 

Idle pixels after rightmost pixel

 

vsync

 

 

 

len

 

number

 

Vertical sync pulse

 

upper

 

 

margin

 

number

 

Idle rows before topmost

 

lower

 

margin

 

number

 

Idle rows after bottom

 

active

 

number

 

Active Matrix (1) or Passive (0)

 

crt

 

number

 

digital LCD(0) or Analog CRT(1)

 

rotation

 

number

 

landscape(0) or portrait(90)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Once you have collected this information, a corresponding entry must be added to the list of panels.

u-boot-1.1.2/common/lcd_panels.c

To allow the testing of these settings and the use of a different display without re-compiling, the lcdp boot loader command is available. It may be used in one of the following ways:

command string

description

lcdp

Show the current lcd panel settings

lcdp ?

Show the list of currently supported lcd panels

lcdp panelname

Select and initialize panelname

lcdp +

Add a new panel (prompts for details)

 

 

Note that the boot loader text display will not be updated properly if the X and Y resolution don’t match the current default display. Use the bmp commands to test the new panel configuration after using the lcdp + command string.

As always, the source code is available. The two modules used to support dynamic display selection are:

common/cmd lcdpanels.c - defines U-Boot commands

common/lcd panels.c - display initialization

7.1.1What display is currently selected?

The lcdp command is used for a variety of purposes including querying the currently selected display.

December 28, 2005

Revision 2.8

Page 35
Image 35
Sonic Alert 2.8 user manual Divisor for the pixel clock. Generally

2.8 specifications

Sonic Alert 2.8 is a state-of-the-art alarm clock designed primarily for individuals with hearing impairments or those who simply require a more robust waking mechanism. Engineered to deliver high-performance features and proprietary technologies, this device stands out as a reliable solution for a restful night and an efficient morning wake-up.

One of the hallmark features of Sonic Alert 2.8 is its powerful bed shaker. This vibration mechanism is designed to be placed under your pillow or mattress, providing a tactile wake-up signal. For individuals who may not respond to traditional auditory alarms, this function ensures that they start their day without being late for appointments or commitments.

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Moreover, Sonic Alert 2.8 is engineered with a user-friendly interface, featuring large, easy-to-read display numbers that are perfect for the visually impaired. The intuitive buttons allow for straightforward operation, including setting alarms or toggling through various functions with minimal hassle.

The device is also equipped with a battery backup feature, ensuring that alarms will still sound even during power outages. This functionality provides peace of mind, knowing that important morning engagements won't be missed.

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Overall, Sonic Alert 2.8 exemplifies innovation in alarm technology, combining advanced features and thoughtful design to cater to users' unique needs. Whether for the hard of hearing or anyone who simply desires a more effective wake-up method, this alarm clock is an ideal choice.