topic Re: GPDMA to accelerate data transfer to 16-bits GPIO port, with GPIO clock in LPC Microcontrollers

GPDMA to accelerate data transfer to 16-bits GPIO port, with GPIO clock

lpcware — Wed, 15 Jun 2016 17:40:24 GMT

Content originally posted in LPCWare by giusloq on Mon May 04 02:29:50 MST 2015
I need to write 320x240=76800 16-bits word to a GPIO port with LPC1769 MCU. After writing a single word, a clock pulse on a different GPIO pin must be generated.
The external device is a ILI9341-based TFT display. The goal is to reduce the refresh time of the display as soon as possible (this will avoid flickering and so on).

I'm not an expert on DMA controllers (I never used them before). Is it possible to use GPDMA peripheral for my application? Is it possible to generate the clock pulse syncronized with 16-bits data write?

Re: GPDMA to accelerate data transfer to 16-bits GPIO port, with GPIO clock

lpcware — Wed, 15 Jun 2016 17:40:25 GMT

Content originally posted in LPCWare by wmues on Mon May 04 04:57:56 MST 2015
Is there any reason why you don't use the EMC for your TFT?

Re: GPDMA to accelerate data transfer to 16-bits GPIO port, with GPIO clock

lpcware — Wed, 15 Jun 2016 17:40:26 GMT

Content originally posted in LPCWare by giusloq on Mon May 04 05:03:59 MST 2015

Quote:
Is there any reason why you don't use the EMC for your TFT?

External memory controller? LPC1769 hasn't this peripheral.

Re: GPDMA to accelerate data transfer to 16-bits GPIO port, with GPIO clock

lpcware — Wed, 15 Jun 2016 17:40:26 GMT

Content originally posted in LPCWare by wmues on Mon May 04 07:02:15 MST 2015
Oh, I see.

Without EMC, I fear that there is no fast solution for your problem.
You might want to use another CPU.