A MCU event driven C framework

brief introduction

This paper is mainly to solve the coupling degree of code function modules , An expression of event driven display .

Current code contains 3 Events , And one of the events contains a sub event .

The code example is as follows

#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <windows.h>

#define MAX_HANDLE_QUEUE 10

typedef enum status
{
    
    EVENT_KEY1_PRESS=0,
    EVENT_KEY2_PRESS=1,
}tEvent;

typedef struct 
{
    
    uint16_t event; //  Event number 
    void (*handle)(uint16_t event); //  Save only the total scatter function of the module 
}handleType;

handleType _handle[MAX_HANDLE_QUEUE];
int _eventHead = 0;
int _eventTail = 0;
bool _eventFull = false;

void test1(uint16_t data1)
{
    
    printf("data1 =%d\n", data1);
}

void test2(uint16_t data2)
{
    
    printf("data2 =%d\n", data2);
}

void keyEventHandle(uint16_t tEvent)
{
    
    switch (tEvent)
    {
    
        case EVENT_KEY1_PRESS:
            printf("EVENT_KEY1_PRESS\n");
        break;
        case EVENT_KEY2_PRESS:
            printf("EVENT_KEY2_PRESS\n");
        break;
        default:
            printf("OTHER KEY EVENT PRESS\n");
        break;
    }
}

void eventProc(void)
{
    
    // uint16_t event;
    uint8_t i;

    if((_eventHead!=_eventTail) || _eventFull) //  Only when there are events in the event queue 
    {
       
        for(i=0; i<_eventTail; i++)
        {
    
            (*_handle[i].handle)(_handle[i].event); //  Pass the event number to the module scatter function 
        }
    }
}

void addEventListener(void (*pFunc)(uint16_t event), uint16_t event)
{
    
    if(!_eventFull)
    {
    
        _handle[_eventTail].handle = pFunc;
        _handle[_eventTail].event = event;
        _eventTail++;

        if(_eventTail>= MAX_HANDLE_QUEUE)
        {
    
            _eventFull= true;
        }
    }
}

//  This function is called during system initialization 
void eventInit(void)
{
    
    addEventListener(test1, 1);
    addEventListener(test2, 2);
    addEventListener(keyEventHandle, 2);
}

int main()
{
    
    eventInit();
    while(1)
    {
    
        eventProc();
    }
    return 0;
}