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ARM newbie...newbie questions!

Stephen Cantini
Note: This was originally posted on 8th February 2012 at http://forums.arm.com

Hello everybody,

this is my first post in the forum. I'm an AVR 8-bit user curious about the ARM world, the Cortex M0 side in particular.

I would like to make a two-processor system, where the video and audio part is generated in software on a little NXP LPC11xx device. The video signal should be a framebuffered 320x200 VGA.

For this to work on a LPC11xx, I need to know a few tech details, and I felt that asking for them here was the thing to do before investing time in the platform.

So, here they are:
  • Does the M0 allow you to connect an external SRAM chip and map it inside the address space, as if it where internal RAM? Does accessing it have cycle penalties? For example, AVRMEGA128s can do this up to 64KB, with 1 cycle penalty per read/write instruction, leading to 3-cycles reads and 3-cycles writes.
  • I still have to understand how to drive pins...it looks like you have to write to particular memory addresses, right? How many pins can I set with a single instruction, and how many cycles does it cost?
  • Ideally the chip should be clocked at 50.35 Mhz, to respect VGA timings. Is it possible to set it to this clock freq?
Thank you very much for any answer.



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