Using SCT to request a gpio (memory) to memory transfer.....

lpcware — Wed, 15 Jun 2016 16:35:54 GMT

Content originally posted in LPCWare by lpc_guy469 on Fri Apr 04 12:01:34 MST 2014
Hello all...

I would like to use SCT state machine events to trigger DMA transfers, i.e. reading a byte from a GPIO port (memory) and writing it to SRAM (memory). In this example, I would prefer the source address (GPIO port) to remain the same but have the destination address (memory) increment.

After some investigation, I am beginning to believe that a memory-to-memory DMA transfer that is initiated (or controlled) by an SCT event will have to be done via an SCT interrupt....not via a DMA request! It appears that issuing a DMA request (0 or 1) from an SCT event is only valid for reading/writing SCT registers. Is anyone able to confirm this for me?

Would anyone be willing to recommend what SCT/DMA facilities I would use to accomplish this goal.

Thanks in advance for your assistance.

.....lpc_guy469

Re: Using SCT to request a gpio (memory) to memory transfer.....

lpcware — Wed, 15 Jun 2016 16:35:55 GMT

Content originally posted in LPCWare by mc on Tue Apr 29 17:42:00 MST 2014
Hi lpc_guy469,
The GPIO to SRAM transfer can be triggered by SCT. On a particular input or match you can generate a event. Based on this event SCT can start transfer. You can use peripheral to memory mode. See the example at

http://www.lpcware.com/content/nxpfile/an11365-sct-camera-interface-design-lpc1800-and-lpc4300

LPC MicrocontrollersのトピックUsing SCT to request a gpio (memory) to memory transfer.....

Using SCT to request a gpio (memory) to memory transfer.....

Re: Using SCT to request a gpio (memory) to memory transfer.....