Digital Stream Converter Box Manual

Digital Stream Converter Box Manual
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Nokia 6100 LCD Display Driver

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James P. have been countless millions of Nokia cell phones sold world-wide and this economy of scale has made it possible for the hobbyist and experimenter to procure the LCD graphic display from these phones at a reasonable price.Sparkfun Electronics (www.sparkfun.com) sells a model 6100 for $19.95 (US).

I’ve seen sources for this display on EBay for $7.99 (US) plus $10.00 shipping (from Hong Kong, so shipping is a bit slow).The Swedish web shop Jelu (www.jelu.se) has this display for about $20.00 (US) also (see photograph below).

Olimex uses these displays on their more sophisticated development boards, so this tutorial will be geared to the Olimex SAM7-EX256 board shown on the front cover.
Figure 1.

Nokia 6100 LCD Display

(from Jelu web site)

The important specifications for this display are as follows:

132 x 132 pixels 12-bit color rendition (4 bits red, 4-bits green, 4-bits blue) 3.3 volts 9-bit SPI serial interface (clock/data signals)
The major irritant in using this display is identifying the graphics controller; there are two possibilities (Epson S1D15G00 or Philips PCF8833).The LCD display sold by the German Web Shop Jelu has a Leadis LDS176 controller but it is 100% compatible with the Philips PCF8833).

So how do you tell which controller you have? Some message boards have suggested that the LCD display be disassembled and the controller chip measured with a digital caliper – well that’s getting a bit extreme.

Here’s what I know.The Olimex boards have both display controllers possible; if the LCD has a GE-12 sticker on it, it’s a Philips PCF8833.If it has a GE-8 sticker, it’s an Epson controller.

The older Sparkfun 6100 displays were Epson, their web site indicates that the newer ones are an Epson clone.

Sparkfun software examples sometimes refer to the Philips controller so the whole issue has become a bit murky.The trading companies in Honk Kong have no idea what is inside the displays they are selling.A Nokia 6100 display that I purchased from Hong Kong a couple of weeks ago had the Philips controller.

I was not happy with any of the driver software examples I had inspected; they all seemed to be “mash-ups” – collections of code snippets for both types of controllers mixed together.None of these examples matched exactly the Philips PCF8833 or the Epson S1D15G00 user manuals, which can be downloaded from these links.

Philips/NXP Epson So I set out to write a driver based solely on the LCD controller manufacturer’s manual.This is not to say that I didn’t have my own mysteries.I had to “invert” the entire display and “reverse” the RGB order to get the colors to work out properly for the Philips controller
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Nokia 6100 Lcd Display Driver
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To keep this tutorial simple, I will not address the issues of scrolling or partial displays (to conserve power) since these are rarely-used features.

I used the Olimex SAM7-EX256 evaluation board as the execution platform.This is an ARM7 board with many peripherals that is an excellent way to learn about the ARM architecture at a reasonable price ($120 from Sparkfun).I also used the YAGARTO/Eclipse platform as the cross-development environment which is explained in great detail in my tutorial “Using Open Source Tools for AT91SAM7 Cross Development” which can be downloaded from the following connection issues are also not the subject of this tutorial; you can download the Olimex schematic for the SAM7-EX256 board to see their design for a hardware interface to the Nokia 6100 LCD display.
LCD Display Orientation

The Nokia 6100 display has 132 x 132 pixels; each one with 12-bit color (4 bits RED, 4 bits GREEN and 4 bits BLUE).Practically speaking, you cannot see the first and last row and columns.

The normal orientation is as follows: Columns

X (0,131) (131,131) (131,0) (0,0) X Y

Rows
Figure 2.

Default Orientation of Nokia 6100 LCD Display

That, of course, is upside-down on the Olimex SAM7-EX256 board if the silk-screen lettering is used as the up/down reference.So I set the “mirror x” and “mirror y” command to rotate the display 180 degrees, as shown below.This will be the orientation used in this tutorial (it is so easy to change back, if you desire).

Rows (0,131) (131,131)(131,0) (0,0) X Y
Columns

Figure 3.

Tutorial Orientation of Nokia 6100 LCD Display
Communication with the Display

The Nokia 6100 uses a two-wire serial SPI interface (clock and data).The ARM7 microcontroller SPI peripheral generates the clock and data signals and the display acts solely as a slave device.Olimex elected to not implement the MISO0 signal that would allow the ARM microcontroller to read from the LCD display (you could read some identification codes, status, temperature data, etc).Therefore, the display is strictly write-only!

We send 9 bits to the display serially, the ninth bit indicates if a command byte or a data byte is being transmitted.Note in the timing diagram below from the Philips manual, the ninth bit (command or data) is clocked out first and is LOW to indicate a command byte or HIGH to indicate a data byte.
Figure 4.

SPI serial interface sends commands and data bytes

How fast can this SPI interface be run? Since the PCF8833 data sheet specifies that the serial clock SCLK period be no less than 150 nsec, dividing the board’s master clock (48054841 Hz) by 8 gives a period of 166 nsec.Thus we can safely run the SPI interface at 6 MHz.

I have run the SPI interface at 16 MHz and it still worked, but that is tempting fate.

The SAM7-EX256 board uses an ARM7 microprocessor; so command
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