Hi
I have been trying to configure the AD9278-50EBZ and the HSC-ADC-EVALCZ for data acquisition. I found the MATLAB script for acquisition on the AD9253 using the HadBoardApi and tried to adapt it (see code attached) to my hardware however, I have a challenge understanding which function calls and parameters are applicable to me. The HadBoardApi is also poorly documented - the .chm file of the HadBoardApi throws some errors in the description field - so it is virtually useless. The following are the specific issues I am having:
1. SPI Initialization Parameter:
board.SpiInitInterface(0, param) ---> What determines the number to enter into the first argument of the function?
2. Which FPGA FIFO?
How do I know the index of the FIFO that must be used when calling the 'CaptureFifoBytes(numBytes, 0)' function? I my troubleshooting, it seems like the index parameter has no effect/change on the output.
2. Enabling and disabling of ADC channel:
How do I disable an ADC channel? the AD9278 has 8 channels (A-H), how may I select say channel D. Yes I know I have to write to a specific AD9278 register (0x04 or 0x05) but nothing seems to change when I do that.
3. Bits, Bytes, Words,.....?:
Can someone please explain how these are related on the two boards? The AD9278 samples in 12 bit resolution by default and consequently (if I understand correctly) the values of the sampled signal should range from 0 to 4096 (offset binary), however when I run the MATLAB script it, values range only from 0 to 255? Even when I try to change the bit resolution of the AD9278 to 8, 10 or 14bit, the values still remain in that range.
4. Extra zeros in sampled data:
The attached image below shows what is typically obtained from the AD9278. Why do I get zeros between each sample?
5. FPGA register address
The MATLAB script for the AD9253 writes some data to the FPGA register address, can I get the FPGA register address for the AD9278?
I will appreciate some answers to these questions.
Thanks,
Josiah
%The following dlls are required for using the library.
%These three dlls are needed in the same directory:
%HadBoardApi.dll
%HadSdpSupport.dll
%sdpApi1.dll
%If you have installed VisualAnalog these dlls will be in the VisualAnalog
%install folder as shown below.
%This needs to be the path to HadBoardApi.dll . Change if necessary.
hadInfo = NET.addAssembly('C:\Program Files (x86)\Analog Devices\VisualAnalog\HadBoardApi.dll');
% NET.addAssembly('C:\Program Files (x86)\Analog Devices\VisualAnalog\HadSdpSupport.dll');
% hadInfo.Classes
% showGenericMethods('HadBoardApi.HadBoard')
%*** Set FPGA file path. ***
%This FPGA program file is for the AD9653. The FPGA program file for AD9253 is AD9253_Main.bin
fpgaFilePath = 'C:\Program Files (x86)\Analog Devices\VisualAnalog\Hardware\HSC_ADC_EVALC\Octal_High_Speed.bin';
% fpgaFilePath = 'C:\Program Files (x86)\Analog Devices\VisualAnalog\Hardware\HSC_ADC_EVALC\High_Speed_Octal_synchronous_capture.bin';
% HadBoardApi.HadBoard.Compatibility;
% NET.setStaticProperty('HadBoardApi.HadBoard.Compatibility',HadBoardApi.CompatibilityFlags.('HadSdp'));
HadBoardApi.HadBoard.FindBoards()
HadBoardApi.HadBoard.BoardCount
%This assumes we found at least one board and want the first capture board found.
HadBoardApi.HadBoard.SelectBoard(0);
board = HadBoardApi.HadBoard.Board;
%Configure FPGA.
board.ConfigureFpga(fpgaFilePath);
%Configure memory map on ADC.
param = HadBoardApi.HadSpiParameters(1, 0, 1)
%param.LongInst = 1, param.LsbFirst = 0, param.SdoActive = 1
board.SpiInitInterface(1, param)
%This section is ADC specific.
%These are ADC SPI register addresses
%Write ADC registers as desired.
% Capture (mail)
board.SpiWrite(int16(hex2dec('00')), uint8(hex2dec('3C'))); % Soft Reset
board.SpiWrite(int16(hex2dec('08')), uint8(hex2dec('03'))); % Digital Reset
board.SpiWrite(int16(hex2dec('08')), uint8(hex2dec('00'))); % release from Digital Reset
board.SpiWrite(int16(hex2dec('14')), uint8(hex2dec('00'))); % set output format to Offset binary
% Power down unwanted channels
% board.SpiWrite(int16(hex2dec('04')), uint8(hex2dec('0F'))); % Disable channels E-H
% board.SpiWrite(int16(hex2dec('22')), uint8(hex2dec('01'))); % Power down channels E-H%
% board.SpiWrite(int16(hex2dec('05')), uint8(hex2dec('0E'))); % Disable channels B-D
% board.SpiWrite(int16(hex2dec('22')), uint8(hex2dec('01'))); % Power down channels B-D
% Reset channels
% board.SpiWrite(int16(hex2dec('04')), uint8(hex2dec('0F'))); % Disable channels E-H
% board.SpiWrite(int16(hex2dec('22')), uint8(hex2dec('02'))); % Power down channels E-H%
% board.SpiWrite(int16(hex2dec('05')), uint8(hex2dec('0E'))); % Disable channels B-D
% board.SpiWrite(int16(hex2dec('22')), uint8(hex2dec('02'))); % Power down channels B-D
board.SpiWrite(int16(hex2dec('05')), uint8(hex2dec('31'))); % Enable channel A only
board.SpiWrite(int16(hex2dec('21')), uint8(hex2dec('00'))); % Set bit resolution
% board.SpiWrite(int16(hex2dec('14')), uint8(hex2dec('00'))); % Set data format (offset binary(00) or two's complement(01))
% board.SpiWrite(int16(hex2dec('0D')), uint8(hex2dec('03'))); % Set a Digital Test Pattern
board.SpiWrite(int16(hex2dec('FF')), uint8(hex2dec('01'))); % Device Update
%% Configure FPGA memory map and capture data.
% Configure FPGA memory map.???????? Does this apply to the AD9278 and HSC-ADC-EVALCZ ?????????
% param = HadBoardApi.HadSpiParameters(1, 0, 1)
% param.LongInst = 1, param.LsbFirst = 0, param.SdoActive = 1
% board.SpiInitInterface(0, param)
% This section configures the FPGA for a specific ADC.
% Again, the register writes here are ADC specific.
% These are FPGA register addresses
% board.SpiWrite(int16(hex2dec('01')), uint8(hex2dec('30'))); %16bits
% 1xframe DDR2lane byte-wise
%Select which AD9653 or AD9253 channel you would like to read data.
%Select only 1
% board.SpiWrite(int16(hex2dec('02')), uint8(hex2dec('00'))) %read ChA
% board.SpiWrite(int16(hex2dec('02')), uint8(hex2dec('01'))); %read ChB
%board.SpiWrite(int16(hex2dec('02')), uint8(hex2dec('02'))); %read ChC
%board.SpiWrite(int16(hex2dec('02')), uint8(hex2dec('03'))); %read ChD
%%
numWords = 2^8; % What exactly is a 'Word' in the context of these two devices (AD9278 & HSC-ADC-EVALCZ)? Is this just a fancy name for 'Number of samples to acquire?'
board.FillFifos(int32(numWords), int32(10));
numBytes = numWords*2; % Why multiple by 2? Should it not be numWords*12bits/8bits?
% Capture bytes. May need to use 2 for the second parameter instead of 1
% for your eval board - How will I know which one to use?????
dataABytes = HadBoardApi.HadBoard.Board.CaptureFifoBytes(int32(numBytes), int16(1));
% Convert to matrix
dataABytesMatrix = uint32(dataABytes);
% Create new matrix with each two adjacent bytes combined into a single
% word
% dataAMatrix = dataABytesMatrix(1:2:end) + dataABytesMatrix(2:2:end)*256;
figure
plot(dataABytesMatrix); ylim([-512 512]);
axis 'square'
