[Discarded samples when sampling >2Mhz with SDK]

Hi,

FDwfDigitalInSampleSensibleSet did the trick! The behavior thru SDK now matches the GUI behavior.

Thank you for your fast response!
//Tood
 

[Discarded samples when sampling >2Mhz with SDK]

Hi,

I am sampling DIO 7 from wavegen GUI. The mode is record without triggers. Sampling rate is 4MHz.
I am using 16x16k buffers. The results are perfect. No corrupt samples (see picture below).

When I am using sample code digitalin_record.cpp as base and sampling above 2MHz the result is a lot of corrupt samples.
See attached C file digitalin_record.c.

My OS is win10 and the compiler is gcc. Output from digitalin_record.exe:

$ ./digitalin_record.exe
Open automatically the first available device
Starting record...
receivedSamples: 93743 discardedCorruptSamples: 83844
sample:0  pinstate:0x01b9
sample:1  pinstate:0x01b9
sample:2  pinstate:0x01b9
sample:3  pinstate:0x01b9
sample:4  pinstate:0x01b9
sample:5  pinstate:0x01b9
sample:6  pinstate:0x01b9
sample:7  pinstate:0x01b9
sample:8  pinstate:0x01b9
sample:9  pinstate:0x01b9
sample:10  pinstate:0x01b9

What is wrong with my implementation?

Best Regards,
Tood

 

digitalin_record.c

[Digilent Analog Discovery 2 Spi Spy (SDK)]

 

Yes! That solved my problem!

Thank you for fast response!

Best Regards,

Tood

 

[Digilent Analog Discovery 2 Spi Spy (SDK)]

Hi,

I am trying to implement spi_spy thru SDK.  
My C program, based on Digital_Spi_Spy.py, decodes  correctly about ~90% of the data. Sometimes it seems to loose trigger and the rest of the frame is corrupt.

The WaveForms Protocol->SPI->Spy works perfectly every time for my setup.

Included is my C code and a .jpg from my and WaveForms output log. The faulty data is marked as yellow in the left log in the picture.

I am writing in C and the spi frequency is 300kHz settings are active low, cpol 0, cpha 0.

Is there something I am missing here? How is SPI Spy implemented in WaveForms?

Best Regards,
Tood

hello.c