#include <stdio.h>
#include <stdint.h>
#include <string.h>

//#pragma pack(1)

typedef union sSetOnChangeFIFO
{
uint8_t raw_data[8];
    struct __attribute__((packed)) {
   uint32_t event;
   uint8_t gpioValue;
uint16_t gpioInstance;
uint8_t gpioController;
    };
}sSetOnChangeFIFO;

sSetOnChangeFIFO setonchange;

void foo(uint8_t *pData)
{
    int i;
    for (i=0;i<8;i++)
    {
        printf("%d, ", pData[i]);
    }
    printf("\n");
}

int main()
{
    //foo(&setonchange.raw_data[0]);
    uint8_t eventWithDataBuffer[12];
    uint32_t data, event = 67;
    //setonchange.ptr_s = &setonchange.raw_data[1];

    setonchange.event = 67;
    setonchange.gpioValue = 1;
    setonchange.gpioInstance = 160;
    setonchange.gpioController = 0;

    printf("size is: %lu\n", sizeof(setonchange));


    data = ((0 & 0x000000FF) << 24) | ((160 & 0x0000FFFF) << 8) | (1 & 0x000000FF);
memcpy(&eventWithDataBuffer[0], &event, 4);
    memcpy(&eventWithDataBuffer[4], &data, 4);
    //printf("%d", *(setonchange.raw_data));

    /*memcpy(&eventWithDataBuffer[0], &setonchange.event, 7);*/
    foo(&setonchange.raw_data[0]);
    foo(&eventWithDataBuffer[0]);
    //printf("length is: %lu", sizeof(setonchange.fields));
    //printf("instance is: %lu", setonchange.s.gpioInstance);

    return 0;
}