Exercise-003 Defining initial transition function

In the protimer_state_mach.cpp, we will implement the state machine. First, let’s start with our initial transition.

#include "main.h"

void protimer_init(protimer_t *mobj){
mobj->active_state = IDLE;
mobj->pro_time = 0;
}

protimer_state_mach.cpp 

The Initial transition function is shown in above.

Create one function. void protimer_init().

Here, the function argument will be pointed to the main application structure. The main application structure is protimer_t; I will give the pointer variable name mobj. This variable we used throughout the state machine diagram.

And  mobj->active_state = IDLE. We have got associated action(Initial transition action). That is, we have to initialize the mobj->pro_time = 0. 

You have to call the protimer_init function from the main.cpp. 

#include "main.h"

/*Main application object */
static protimer_t protimer;

void setup() {
// put your setup code here, to run once:
  protimer_init(&protimer);
}

main.cpp

In the main.cpp, first, let’s create the main application object as a global variable protimer.

protimer_t protimer is a main application object. You can also protect the main application object using the ‘static’ keyword. And send the address, write in the setup function; protimer_init(&protimer).  

protimer_state_mach.cpp file has to share the prototype of that function.

For that, just copy the void_protimer(protimer_t *mobj) function declarator in protimer_state_mach.cpp and go to main.h and will give the prototype(Figure 1). 

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