NHD-2.4-240320CF-CSXN#-F support from ARM processors

Ihab Awad

• September 14, 2022 17:15

Hi folks,

I am asking about the "8080" style parallel 8 and 16 bit interface displays such as:

https://newhavendisplay.com/2-4-inch-sunlight-readable-tft-without-touchscreen/

 

Do you have examples of how I can use the pinouts on an ARM processor like a Freescale i.MX7 to drive such a display in *parallel* mode (i.e., not using SPI), using direct memory access rather than toggling GPIOs individually from a program?

 

Thank you!

 

Ihab

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  Engineering Support

  Community moderator

  • September 19, 2022 16:19

  Hi Ihab,

  Unfortunately the ST7789V controller on the NHD-2.4-240320CF-CSXN#-F display does not support a DMA transfer directly to it's frame buffer.  An 8-bit or 16-bit 8080-II parallel MCU interface is required to send commands and data to the display.  Please see the ST7789V datasheet for more details. https://support.newhavendisplay.com/hc/en-us/article_attachments/4414880310423/ST7789V.pdf 

  Best Regards,

  Ted

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  Ihab Awad

  • September 19, 2022 18:18

  Thank you very much! This is not a direct Newhaven question -- I was just unable to find information from the ARM system integrators, and I wondered if you happened to have encountered this. What I was looking for was something on the ARM micro side which would treat the GPIOs of the processor as an 8-bit data bus, and do DMA from program memory to the GPIOs at high speed.

  Ihab

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