Yeshvanth Muniraj
Published

Interfacing Red Pitaya with MATLAB

Interfacing Red Pitaya with MATLAB

IntermediateProtip2 hours97
Interfacing Red Pitaya with MATLAB

Things used in this project

Hardware components

STEMLab 125-10
Red Pitaya STEMLab 125-10
×1
SMA to BNC Converter
×1
BNC Oscilloscope x1/x10 Probes (Pair)
Digilent BNC Oscilloscope x1/x10 Probes (Pair)
×1
Rotary potentiometer (generic)
Rotary potentiometer (generic)
×1
IC 555 Pulse Generator Circuit
×1

Story

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Code

MATLAB Code

MATLAB
%% Define Red Pitaya as TCP/IP object
clear all
close all
clc
IP= '192.168.178.111';                % Input IP of your Red Pitaya...
port = 5000;
tcpipObj = tcpip(IP, port);
tcpipObj.InputBufferSize = 16384*32;

%% Open connection with your Red Pitaya

fopen(tcpipObj);
tcpipObj.Terminator = 'CR/LF';

flushinput(tcpipObj);
flushoutput(tcpipObj);

% Set decimation vale (sampling rate) in respect to you
% acquired signal frequency

fprintf(tcpipObj,'ACQ:RST');
fprintf(tcpipObj,'ACQ:DEC 1');
fprintf(tcpipObj,'ACQ:TRIG:LEV 0');

% there is an option to select coupling when using SIGNALlab 250-12
% fprintf(tcpipObj,'ACQ:SOUR1:COUP AC'); % enables AC coupling on channel 1

% by default LOW level gain is selected
% fprintf(tcpipObj,'ACQ:SOUR1:GAIN LV'); % user can switch gain using this command


% Set trigger delay to 0 samples
% 0 samples delay set trigger to center of the buffer
% Signal on your graph will have trigger in the center (symmetrical)
% Samples from left to the center are samples before trigger
% Samples from center to the right are samples after trigger

fprintf(tcpipObj,'ACQ:TRIG:DLY 0');

%% Start & Trigg
% Trigger source setting must be after ACQ:START
% Set trigger to source 1 positive edge

fprintf(tcpipObj,'ACQ:START');
% After acquisition is started some time delay is needed in order to acquire fresh samples in to buffer
% Here we have used time delay of one second but you can calculate exact value taking in to account buffer
% length and smaling rate

fprintf(tcpipObj,'ACQ:TRIG CH1_PE');
% Wait for trigger
% Until trigger is true wait with acquiring
% Be aware of while loop if trigger is not achieved
% Ctrl+C will stop code executing in MATLAB

while 1
        trig_rsp=query(tcpipObj,'ACQ:TRIG:STAT?')

        if strcmp('TD',trig_rsp(1:2))  % Read only TD

        break

        end
    end


% Read data from buffer
signal_str=query(tcpipObj,'ACQ:SOUR1:DATA?');
signal_str_2=query(tcpipObj,'ACQ:SOUR2:DATA?');

% Convert values to numbers.% First character in string is “{“
% and 2 latest are empty spaces and last is “}”.

signal_num=str2num(signal_str(1,2:length(signal_str)-3));
signal_num_2=str2num(signal_str_2(1,2:length(signal_str_2)-3));

plot(signal_num)
hold on
plot(signal_num_2,'r')
grid on
ylabel('Voltage / V')
xlabel('samples')

fclose(tcpipObj)

Credits

Yeshvanth Muniraj

Yeshvanth Muniraj

23 projects • 15 followers
Hands-on experience in Embedded Systems and IoT. Good knowledge of FPGAs and Microcontrollers.

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