How to get input data using Digital_Spi_Spy.py on Digital Discovery

[JeffKlaas]

I expect the example program Digital_Spi_Spy.py to work correctly on the Digital Discovery module without modification. It does not.

To fix the device enumeration error the following had to be changed:

dwf.FDwfDeviceOpen(c_int(-1), byref(hdwf))
#  device configuration of index 3 (4th) for Analog Discovery has 16kS digital-in buffer
#dwf.FDwfDeviceConfigOpen(c_int(-1), c_int(3), byref(hdwf))

With this change the script runs and properly transmits data. However when connecting the DIO-2 (MOSI) to DIO-3 (MISO) pins, I expect the device to capture exactly what it transmits. The script always returns bit count of zero and no data.

Please tell me what additional modifications are required to get SPI loopback working. 

 

[attila]

Hi @JeffKlaas

Here you have the SPI Spy example for Digital Discovery:  Digital_Spi_Spy_DD.py 

The FDwfDigitalInInputOrderSet with 1 will align Digital-In bits like [DIO 24-39 DIN 0:15], with 0 you will get [DIN 0:24 DIO 24:31]
The 32bit sampling and DwfDigitalInSampleModeNoise is required for Digital Discovery Digital-In Sync mode.