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Could we get some support regarding SPI on the AFE5809EVM board?
We are controlling the SPI from an ARM chip with the following configuration:
SCLK - 128 kHz
Data Width - 24 bits
Shift direction - MSB first
The data that comes out has been verified with an oscilloscope.
However, when the signals are connected to the SCLK, SEN, SDATA, GND pins, we are not able to have it working.
We use the exact same series of command as used by the AFE5809 EVM GUI (as it allows us to record its commands). The USB is disconnected and we are purely running the SPI from the on board pins.
Any suggestions as to why it might not be working?
In reply to csmyth:
The problem is that if I am sending three packets of 8 bits, the SEN will not be low the entire time, but low for the first packet of 8 bits and then back up again. Would that still work? I'm guessing no.
In reply to Jack Zhang2:
Actually we can get the SEN to stay low the entire time.
To run SPI and remove USB did you remove FB17 to disable USB?
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