1. Home
  2. Embedded Programming
  3. Sitronix ST7529: need help

Sitronix ST7529: need help

Hi, I am trying to get an LCD display with a built-in Sitronix ST752 controller going and not having much luck. There are several capacitor that can be setup to generate the LCD voltage with a multiplier of 2 to 8 The hardware has been setup for a multiplier of 4. I'm completely unclea as to how you would determine what multiplier to use. The controller has reference voltage generator, a voltage follower, and a booster. I don' know which of these I need to enable (looks like all for interna operation with only a single 3.3v supply). There is also an interva digital pot for setting of the display contrast. I've not been able t get any voltage out of the power supply section. I do seem to be gettin a status readback from the display. Can anyone help clear this up for m a bit? The processor being used is a PIC18F4620 BTW.

Reply to
blair42
Loading thread data ...

Hi,

Generally this setup are fixed for the display. When I start on a driver for a new display I usually ask the distributor. They often have some Init C-code for the particular display laying around...

/Race

blair42 wrote:

Reply to
RaceMouse

We use a single 3.3V supply, and have the hardware setup with a 5x step-up giving 16.5V VLCD The software setup we follow is as in the Sitronix datasheet (page

55) : void ST7529_Init( void ) {...} With this setting we get the correct voltage read-out, and can even see a little bit contrast on the LCD. But changing the display memory doesn't show any difference on the display.

Henk

Reply to
HenkDijkstra

Hello!

The best way I found to make a driver is to... get it from the maker. Usually, you get a bunch of assembler lines made for an unidentified processor and without a single line of comment, but that's enough to start. Actually, the hardest thing is to get something displaying. Ons you get something on the screen, that's a piece of cake. Change one parameter at a time and see what it does. Of course, you should try to understand by using the instruction tables what does any single line of assembler. I have used the ST7541 with a 4-level (2-bit) grayscale screen as shown here:

formatting link
And the screen is here: (the second one, 128 x 112)
formatting link

The Sitronix doc I have is very accurate, so I guess it's the same for all their products and you shouldn't have that much trouble to get a working driver quickly.

Pascal

Reply to
murayama

Hi, I bought a powertip PE240128-001 LCD panel built in the ST7529. I hav tried the ST7529_init but I still cannot see anything on the display. D you have any experience with this LCD? How is the hardware configuration

Richard

Reply to
weikeng

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.