TFTLCD breakout has unexpected driver chip

[DigitalJohnson]

I just purchased a TFTLCD breakout (ID:335) from adafruit. This is the second one I've bought. The new board is reporting the driver chip as 9321 and does not work with the provided libraries, and is not listed in those libraries. Does anyone have or know where I can get a library that works with this driver?

Thanks for any replies,
DigitalJohnson

[adafruit]

sounds like a wiring issue or a cold solder joint - check your soldering

[pburgess]

Especially check the order of the 8 data lines...I've put this combo together a billion times and I STILL get wires swapped sometimes!

[madhunm]

Hello Adafruit team,

I have an unusual problem with the latest version of the TFTLCD Library:

I have the 2.8" TFT Touch Shield for Arduino with a HX8347G driver and if I use

Code: Select all

uint16_t identifier = tft.readID();

from the new version of the library, readID() returns 5555.

However, if I use

Code: Select all

uint16_t identifier = tft.readRegister(0x0);

from the old version of the library, it works just fine.

Any ideas what could have gone wrong?

Thanks,
Madhu.

[adafruit]

readID is not the same as reading the register - there's nothing wrong

[madhunm]

Hello,

I am sorry if my question was not clear.

Let me try again:

As I have said before, I have the 2.8" TFT Touch Shield for Arduino with a HX8347G driver.

If I use

Code: Select all

uint16_t identifier = tft.readID();

In the new version of the library, readID() returns 5555 instead of 0x7575. The TFT shield does not initialise at all.

Thanks,
Madhu.

[pburgess]

Howdy,

This issue has come up a few times recently, but I've not been able to reproduce it here yet. What type of Arduino board specifically are you using? The readID() function saw some optimization in the last commit...it might be pushing up against some boundary condition.

I might ask you to try a few tweaks in the library code. Are you familiar with editing library files outside the normal Arduino IDE?

[madhunm]

Hello,

I am using an Arduino Uno R2. I have attached the Serial Monitor output below for the 'graphicstest' example included with the library:

Serial Monitor Output

ADAFruit TFT.PNG (64.94 KiB) Viewed 672 times

I have not changed anything in the example; nor have I changed anything in how the Serial Monitor output looks like. I have copy-pasted it as-is.

And, Yes; I am familiar with editing library files.

Thanks,
Madhu.

[pburgess]

Okay, I'm running the same hardware here, still not running into this. What version of the Arduino software are you running?

Thanks for your patience, we'll sort this out yet!

[madhunm]

I am using Arduino 1.0.2

[pburgess]

Okay, thanks. Still trying to reproduce here. In the meantime though...please try the latest version of the code on Github, at the very least this should fix the problem of the Vogon poetry mixed in the serial output!

[madhunm]

Hello,

I tried the latest commit of the TFT library; except for the Vogon poetry, the problem of the unidentified driver chip ID still remains.

Here is the latest screen capture of the Serial Monitor output:

Serial Monitor output

ADAfruit TFT Serial Monitor.PNG (66.69 KiB) Viewed 602 times

Thanks,
Madhu.

[adafruit]

can you do me a favor and post the exact code you're running? the ID 0x5555 is valid and it should work...

[madhunm]

Hello,

Well, I am trying to run the 'graphicstest' example included with the library.

Thanks,
Madhu.

[pburgess]

Just something to try…

In the file Adafruit_TFTLCD/pin_magic.h, line #103 looks like this:

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  #define write8 write8inline

Immediately following that, try adding this extra line:

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  #define read8 read8inline

Compile and upload to board. Any change in results?