Sample Of App Designer Matlab
This note details how to implement a basic Graphical User Interface (GUI) in order to remotely control the B-Box RCP prototyping controller, or B-Board PRO inverter controller. The application is built on MATLAB App Designer (formerly MATLAB GUI) and the communication is achieved by using UDP/Ethernet packets.
The implementation of such an interface is typically useful in order to manage the run-time execution of a power converter, including for instance:
- Status information (running, stopped, discharge, fault, etc.)
- Real-time measurements (power flows, voltage, current, etc.)
- Fault diagnosis information (log messages, probable causes, etc.)
- Operation set points (current, power, etc.)
- Commands (start, stop, control mode change, etc.)
The use of such a GUI is often complementary to the imperix remote control software, which is often preferred for debug purposes. Also, the purpose of the GUI is limited to real-time interactions with the power converter controller(s) and is not related to how to program the controller(s), which can be done using dedicated SDKs.
Software resources
To be completed…
MATLAB App Designer
Being part of MATLAB basic package, App Designer enables to conveniently design graphical user interfaces by dragging and dropping visual components. Actions and processes are meant to be implemented in the well-known MATLAB programming language. At a later stage, standalone applications can be built and launched on any computer using the free MATLAB Runtime.
Ethernet communication
B-Box RCP and B-Board PRO support data communication protocols by providing high-level functions or blocks that allow the user to conveniently send and receive data. Examples are given in the related Simulink blockset. The present example has been implemented using UDP over Ethernet communication, because of its broad availability.
Data exchange planning
A few basic principles apply to the UDP communication with B-Box RCP and B-Board PRO:
- Packets must be 4 bytes long
- Consequently, they are usually carrying one variable of 32 bits each
- In order to allow communication of multiple variables, the system implements communication mailboxes, each mailbox being listening or sending to a given UDP port
The timing of the packets is defined such that:
- When the user code reads a packet, it gets the latest one (on the mailbox port), even though no packet was received between two reads.
- When the user code writes a packet, it is sent immediately. The send rate is limited, though.
Based on the above-mentioned considerations, a list of data exchanges is built as follows.
| Port | Destination | Description | Data type | Comments on data content |
|---|---|---|---|---|
| 2222 | Computer | Custom action result (counter) | uint32 | |
| 2223 | B-Box RCP | Custom action | uint32 | 1: A 2: B |
| 2224 | B-Box RCP | Start/Stop action | uint32 | To stop, send 0, to start send 1 |
| 2225 | Computer | Core state | uint32 | 2: enabled 1:disabled (struct tCoreState) |
| 2226 | B-Box RCP | DC bus reference | float32 | Must be saturated in B-Box |
| 2226 | Computer | DC bus measurement | float32 | |
| 2227 | B-Box RCP | Id setpoint | float32 | |
| 2227 | Computer | Id measurement | float32 | |
| 2228 | B-Box RCP | Iq setpoint | float32 | |
| 2228 | Computer | Iq measurement | float32 | |
| 2229 | Computer | Vac measurement | float32 | |
| 2230 | Computer | Vbat measuremeent | float32 | |
| 2231 | B-Box RCP | Precharge relay action | uint32 | 1: close relay, 0: open relay |
| 2231 | Computer | Precharge relay state | uint32 | 1: closed 2: open |
| 2232 | B-Box RCP | AC relay action | uint32 | 1: close relay 0: open relay |
| 2232 | Computer | AC relay state | uint32 | 1: closed 2:open |
C/C++ code implementation overview
This section is applicable for users of the imperix CPP SDK.
The initialization of input and output mailboxes should be implemented inside function tUserSafe UserInit(void) {}. Typical initialization looks like:
Code language: C++ ( cpp )
constexpr unsigned int MB_ACTION_RESULT = 0; constexpr unsigned int MB_ACTION = 1; char ip_address[] = "10.10.10.53"; float update_frequency = 100.0; tUserSafe UserInit () { // ... Eth_ConfigureOutputMailbox(MB_ACTION_RESULT, ... 2222, ip_address, update_frequency); Eth_ConfigureInputMailbox(MB_ACTION, 2223); // ... }
At run-time, the following calls can be made so that to access the received data or send new packets:
start_cnt = Eth_ReadUint(MB_ACTION); Eth_Write(MB_ACTION_RESULT, payload);
ACG code implementation overview
This section is applicable for users of the imperix ACG SDK.
'Ethernet input mailbox' and 'Ethernet output mailbox' blocks (available in the imperix library) should be inserted in the Simulink files to ensure communication with the GUI.
The Ethernet input mailbox receives the information from the GUI. The Ethernet port number and the signal format must be specified in the block settings.
The Ethernet output mailbox sends the information to the GUI. The Ethernet port number, the Ethernet IP address (of the PC on which the GUI is running), the signal format and the sending frequency must be specified in the block settings.
Implementation principles in App Designer
Initialization
Besides the instantiation of the controls, the application implements a few properties:
-
app.timerobject which will be used to trigger the data refresh -
isconnectedvariable that stores the connection state -
timevariable that allows time counting
A startup function is implemented in order to configure the timer callback properly.
Code language: Matlab ( matlab )
function startupFcn (app) app.timer.TimerFcn = @(~, ~) readEthernetandUpdate(app); % inits the timer (not stared yet,though. Done by ConnectButtonPushed()) end
Background processes
As long as isconnected > 0 a refresh task (readEthernetandUpdate()) is triggered by a timer with a period of 0.5 seconds. An excerpt of the function is:
Code language: Matlab ( matlab )
function readEthernetandUpdate (app) app.time = app.time + 0.5; if (typecast(flip(typecast(judp('RECEIVE',2225, 4), 'uint8')'),'uint32'))>1 app.StateLamp.Enable = 1; else app.StateLamp.Enable = 0; end % ... (truncated) app.IdGauge.Value = ... double(typecast(flip(typecast(judp('RECEIVE',2227, 4), 'uint8')'),'single')); app.IqGauge.Value = ... double(typecast(flip(typecast(judp('RECEIVE',2228, 4), 'uint8')'),'single')); % ... (truncated) end
Actions
Actions (i.e. sending data from the computer) are implemented via callbacks on GUI elements. Two examples are presented below, one sending a uint32 and the second a float32. Typecasting as well as byte flipping must be implemented as follows.
Code language: Matlab ( matlab )
function DisableButtonPushed (app, event) if app.isconnected % performs the action only when connected judp('SEND', 2224, app.BBoxIPEditField.Value, int8([0 0 0 1]')); end end
Code language: Matlab ( matlab )
function DCbusreferenceEditFieldValueChanged (app, event) value = app.DCbusreferenceEditField.Value; if app.isconnected judp('SEND', 2226, app.BBoxIPEditField.Value, flip(typecast(single(value), 'int8'))'); end end
Closing comments
Implementing a GUI with App Designer is a rather quick and easy task since it requires little knowledge in programming. Besides, this relies on the well-known MATLAB environment that ACG SDK users are often already familiar with. Also, given the well-integrated UDP communication functions on the B-Box RCP and B-Board PRO platforms, the data exchange is straightforward to set up.
Even though many variables can be sent and read from a remote computer, the main drawback of this approach if the performance because:
- It relies on executing an interpreted MATLAB code, which is a CPU-intensive task on the PC
- The UDP handling code processes each RECEIVE request sequentially (i.e. open port, wait for the first incoming packet, transfer data to the user code), which makes this approach inefficient (drops most of the packets) and slow.
Consequently, for use cases where performance is more important than flexibility (e.g. data logging), other solutions should be considered such as for example BB Control software.
Simon is the CEO and a co-founder of imperix. He is the co-author and reviewer of several application notes and technical notes.
Sample Of App Designer Matlab
Source: https://imperix.com/doc/help/gui-with-matlab-app-designer
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