[MATLAB] Design and implementation of RFID baseband Manchester encoding (finite state machine scheme)

Here is a simple step-by-step procedure for designing a Simulink model of a Manchester encoder via a finite state machine (FSM):

1. Open Simulink and create a new model.
2. Select the "Stateflow" library from the Simulink library and drag the "Chart" block into the model.
3. Right-click on the "Chart" block and select "Edit Chart" to open the statechart editor.
4. In the state diagram editor, design a state machine to implement the Manchester encoder. The state machine should have two states: HIGH (high level) and LOW (low level). When the input signal is 1, the state should transition from LOW to HIGH and the output signal should be 1. When the input signal is 0, the state should transition from HIGH to LOW and the output signal should be 0. Each state should have a leave operation that sets the value of the output signal, and should have two transitions: one for going from HIGH to LOW and one for going from LOW to HIGH.
5. Close the statechart editor and return to the Simulink model.
6. Add a "Triggered Subsystem" block to the model that will be used to implement the behavior of the state machine.
7. In the "Triggered Subsystem" block, add an input port to receive the input signal. The port should be named "in".
8. Add an output port to output the encoded signal. The port should be named "out".
9. Add a "Chart" block inside the "Triggered Subsystem" block and connect it to the input and output ports.
10. Right-click on the "Chart" block and select "View Stateflow Chart" to open the statechart editor.
11. In the state diagram editor, open the "Simulink Functions" library, drag an "Outport" block into the state machine, and name it "out".
12. On the State panel, click State Actions to open the State Actions window.
13. In the "State Actions" window, add a "Simulink Function" action that will call a MATLAB function to compute the encoded signal. The function should take the input signal and state as parameters and return the encoded signal. For example, a function called "manchester_encoder" could be written to compute a Manchester encoded signal.
14. Close the statechart editor and return to the Simulink model.
15. Add a "Function Caller" block to the model and connect it to the output port of the "Triggered Subsystem" block.
16. In the "Function Caller" block, select the MATLAB function and function parameters to call.
17. Connect the output signal of the "Function Caller" block to the block that needs to encode the signal.

Note that this is just a simple example model. Actual Manchester encoders may require more complex state machines, and MATLAB functions may need to be modified for specific encoding requirements.

In Simulink, adding a module to a Stateflow chart requires the following steps:

1. Open the Stateflow chart and select "Chart Properties".
2. In the "Properties" dialog box, select the "Data" tab, check the "Data Store Memory" and "Signal" check boxes. Click "OK" to save the changes.
3. Add a "State" (state) block or "Function" (function) block to the Stateflow chart.
4. Drag and drop the module into the chart, and change the properties of the module as needed.
5. Connect the added blocks to the states in the chart by creating transitions in the Stateflow chart.
6. Configure transition conditions to realize the interaction between modules.

The specific operation of adding modules may be slightly different due to different versions and usage environments, but the general steps are similar.