How to uint32 to unsigned char array

Question

I have 8 uint32 elements and i want to break each uint32 into 4 uint8 then add all uint8 beside each others as unsigned chars in the array , how can i do that ?

Answer 1

You can make use of the power of union for this

union value
{
   uint32 number;

   struct bytes
   {
       uint8 bytevalue[4];
   };
};

Answer 2

UINT32 value;
UINT8 byteval[4];

for(int i = 0 < 4; i++)
    byteval[i] = value >> (i*8);

Answer 3

Use Structure & Union in combination.

    typedef struct
{
    uint32 ArrayOf32Bit[8];
}Arrayof32bitVar_t;

typedef union
{
    Arrayof32bitVar_t Var8int32;
    uint8             Array8char[8*4]; // instead use macro
}tydefUnion_t;

func_add
{
    int i
    tydefUnion_t a; // 

    /*Here update variable a.Var8int32.ArrayOf32Bit*/

    int addResult = 0; 
    for(i;i<(8*4);i++)
    {
        addResult += a.Array8char[i];
    }
}