Capture and store the data, that are changing at falling edge of 27MHz
clock and stable at rising edge.
Few megs burst is enought, continuous capture is not needed.
Omikron
Dne 21.9.2015 v 19:03 Przemek Klosowski napsal(a):
On Mon, Sep 21, 2015 at 12:47 PM, Tomáš Franke <[email protected]
<mailto:[email protected]>> wrote:
How fast GPIO can be? Is it possible to store 8bit data stream
clocked by 27MHz clock signal to the memory, for example?
Perhaps, but... it depends on details. Are you going to sample the
clock or using the clock to latch the data into BBB input registers?
You probably need to use PRU rather than the main CPU because at this
speed there wouldn't be much left for other OS functions. You have to
be careful about managing memory: how long to you want your capture to
run? 30MB/s is basically what you get from mass storage, but with BBB
512MB memory, you'd completely fill it in a couple of seconds. Do you
watn to capture and store? capture and process?
In other words, more detail, please.
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