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External SPI RAM (not Flash)

Topic last updated 17 Jun 2011, by ceri clatworthy. 1 reply
Jeff Craighead
17 Jun 2011

Can anyone recommend a fast 640KB+ SPI memory module? I'm grabbing data from a ITG-3200 gyro at about 4kHz and need to record about 10 seconds worth of data. Obviously the buffer on the mbed fills too quickly to be usable for this. I can offload the data using the Serial port at 921600, but that limits my update rate to about a 2kHz update rate in practice. I was thinking that a high speed SPI memory would probably work as temporary storage and then I could upload over serial to the host PC at the end of 10 seconds. If anyone has any other solutions I'm open to suggestions.

Thanks!

ceri clatworthy
17 Jun 2011

You could use Basic HID interface, Assuming you are permanently connected to PC.

You can easily send 64 bytes per message. And at very high throughput.

Although,unfortunately, I have not managed to make my MBED BE A Basic HID Device, although it is very simple with PIC18F4550 Family.

Regards

Ceri.