ILI9341 slow screen update

Mbed OS
1

Hi, I’m using the 4-wire ILI9341 with FRDM-K64F and im using the SPI_TFT_ILI9341 library to control the display. I can’t figure out how to speed up the screen update on the display, I have tried changing the SPI freq to around 78 Mhz but It seems it not doing anything(I know it shouldn’t be 78 Mhz but I was just trying to see if anything happens), I’ve tried to import the BurstSPI but unfortunately it doesn’t support K64F and I have no idea how to change it so it works.

Here is my program

Thanks to anyone in advance.

2

In my experience, Mbed SPI is quite slow, which is especially noticeable when driving larger displays. I ended up using the manufacturer’s HAL directly. You should use DMA to improve the performance further. Use a logic analyzer to see where the delays are.

3

Hi, Sorry if I’m going to sound dumb but I’m kinda new to this, what do you mean manufacturer’s HAL?