Project Consideration(fill me in)
bambino
Posts: 789
Hi All,
I would like to build a board for the propeller chip, But a few questions plague me.
I2C used for the program upload from the EEprom. I believe adding a·seial backpack to a NV SRAM chip and using the lower 32k for program memory is doable as long as I use I2C. The rest of the memory(accessed by SPI or CAN) for whatever(Possibly the·65k needed for 640 X 480 vga).
I was curious if any one knew the resistor values for making the vga dac a 3 bit dac instead of two, and would 128k be enough memory for the buffer needed to run that resolution. After 32k program memory I would have 224k left but was hopeing I could save some for other things.
Thanks to Mike and Beau for filling me in on the peripheal protocals, all thats left is the Mic and AMP for audio. I will post these questions later, Though I believe I can wing that.
The goal would be: the prop using 1 I2C, 2SPI, and 1 CAN. Leaving the rest of the I/O to things I'll do when I get a propeller. Hopefully Phils PropCam!
Almost forgot! How crazy is running an external clock from another IC; instead of a crystal.
Post Edited (bambino) : 7/26/2006 6:27:47 PM GMT
I would like to build a board for the propeller chip, But a few questions plague me.
I2C used for the program upload from the EEprom. I believe adding a·seial backpack to a NV SRAM chip and using the lower 32k for program memory is doable as long as I use I2C. The rest of the memory(accessed by SPI or CAN) for whatever(Possibly the·65k needed for 640 X 480 vga).
I was curious if any one knew the resistor values for making the vga dac a 3 bit dac instead of two, and would 128k be enough memory for the buffer needed to run that resolution. After 32k program memory I would have 224k left but was hopeing I could save some for other things.
Thanks to Mike and Beau for filling me in on the peripheal protocals, all thats left is the Mic and AMP for audio. I will post these questions later, Though I believe I can wing that.
The goal would be: the prop using 1 I2C, 2SPI, and 1 CAN. Leaving the rest of the I/O to things I'll do when I get a propeller. Hopefully Phils PropCam!
Almost forgot! How crazy is running an external clock from another IC; instead of a crystal.
Post Edited (bambino) : 7/26/2006 6:27:47 PM GMT
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EDIT : Ignore this, I've just noticed there is a whole thread on SPI