TFT ILI9341V 8080II mode with DMA.

[DVill]

Hello everybody,

I'm developing a board with STM32F429 configured for a 8080II interface TFT display.

I have a 240x320 TFT (ILI9341) and 5-6-5 frame buffer in internal RAM.

Everything works and actually I flush the buffer on lcd via a loop that write at 0x6C000004 the pixel words (A1 used for register/data selector on Nor bank 4).

Now, for a better perfomance I would like to use the DMA.

I configured it for memory to memory transaction of 76800 word of frame buffer.

What I got is that only a part of display is refreshed.

The photo with "hello world" is about flushing with a loop, the other is related to flushing with DMA.

Do you ever face any sort of this problem?

Thanks for your attention and for any suggestion you'll give me.

By(t)e.

[waclawek.jan · Accepted solution]

> I configured it for memory to memory transaction of 76800 word of frame buffer.

DMA NDTR is 16-bit so maximum muber of transfers is 65535.

Read the DMA chapter in RM.

JW

[DVill]

Ooooppsssssss!!!!!!

What a donkey!

Sorry but I really miss that NDTR is 16bit long and not 32!

I think it's time to bed now! 😊

Many many thanks for your support.

Bye