Red Pitaya Lock-in+PID Application with HARMONIC modulation

This started being a striped version of lock-in+PID project. Now it incorporated some new features that make it another App.

Features

• Lock-in amplifier
• in-phase and quadrature Demodulation
  • Demodulation for arbitrary phase
  • Demodulatión for double and triple frequency
• Two PID filters, for loop back stabilization
• Ramp/Scan controller for response analysis
• Lock control for automatic scan-stop / PID start
• Streaming system for continued acquisition of two channels
• Remote control through HTTP API  

New Interface for lock-in R & Phase :

More decimaion values

| dec | max oscilloscope lenght | |--------|-------------------------| | 1 | 0.131072 ms | | 8 | 1.048576 ms | | 64 | 8.388608 ms | | 128 | 16.777216 ms | | 256 | 33.554432 ms | | 512 | 67.108864 ms | | 1024 | 134.217728 ms | | 8192 | 1.073741824 s | | 65536 | 8.589934592 s | | 524288 | 68.719476736 s |

Lock-in and PID application for RedPitaya environment

This is an application built for the Red Pitaya STEMlab 125-14 board (RP). The board is closed-hardware and open-software. You can buy the board and build your own software.

If you have a RP board you can install the Lock-in+PID application by copying the lock_in+pid_harmonic folder (that comes with this tar/zip file) to the /opt/redpitaya/www/apps folder (inside the RP).

For more information about installing procedure, refer to: https://marceluda.github.io/rplock-inpid/TheApp/install/

Development

To build of modify the App you need a linux development environment with: - Vivado 2015.2 - gcc-linaro-4.9-2015.02-3-x8664arm-linux-gnueabihf (installed on /opt/linaro/gcc-linaro-4.9-2015.02-3-x86_64_arm-linux-gnueabihf/)

The App was based on code from project: https://github.com/RedPitaya/RedPitaya/tree/release-v0.95/apps-free/scope

Software requirements

You will need the following to build the Red Pitaya components:

1. Various development packages:

bash sudo apt-get install make u-boot-tools curl xz-utils nano

1. Xilinx Vivado 2015.2 FPGA development tools. The SDK (bare metal toolchain) must also be installed, be careful during the install process to select it. Preferably use the default install location.

2. Linaro ARM toolchain for cross compiling Linux applications. We recommend to install it to /opt/linaro/ since build process instructions relly on it.

```bash TOOLCHAIN="http://releases.linaro.org/14.11/components/toolchain/binaries/arm-linux-gnueabihf/gcc-linaro-4.9-2014.11-x8664arm-linux-gnueabihf.tar.xz"

TOOLCHAIN="http://releases.linaro.org/15.02/components/toolchain/binaries/arm-linux-gnueabihf/gcc-linaro-4.9-2015.02-3-x8664arm-linux-gnueabihf.tar.xz"

curl -O $TOOLCHAIN sudo mkdir -p /opt/linaro sudo chown $USER:$USER /opt/linaro tar -xpf linaro.tar.xz -C /opt/linaro ```

NOTE: you can skip installing Vivado tools, if you only wish to compile user space software.

1. Missing gmake path

Vivado requires a gmake executable which does not exist on Ubuntu. It is necessary to create a symbolic link to the regular make executable.

bash sudo ln -s /usr/bin/make /usr/bin/gmake

1. On Ubuntu Linux you also need:

bash sudo apt-get install make u-boot-tools curl xz-utils sudo apt-get install libx32gcc-4.8-dev sudo apt-get install libc6-dev-i386

The building was tested on Ubuntu 16.04 Linux x86_64

Building

Run on terminal:

bash source settings.sh make

Or form App folder lock_in_mtm :

bash source ../settings.sh

and then...

For web controller building:

bash make app

For FPGA implementation:

bash make fpga

For tar.gz packaging

bash make tar

For cleaning:

bash make clean # clean all make clean_app # clean only C objects make clean_fpga # clean only FPGA implementation temp files and .bin

Upload App to Red Pitaya device

UnZip / UnTar the App folder. Execute from terminal:

bash ./upload_app.sh rp-XXXXXX.local

Replace rp-XXXXXX.local by your RP localname or IP address

Also, you can use your own SSH client and upload the lockin+pidharmonic folder the the RedPiaya folder: /opt/redpitaya/www/apps