Hex To Ascii String

hi all,

before of stated duplicate topics, please read on because can assure not.
i had search numerous time solution , still couldnt find in forum. so, please bear me , read on.

situation :
1. got reply serial device following data (hex) :

30

44

42

45

2. store of data array. lets call arraya.

arraya[0]	0x30
arraya[1]	0x44
arraya[2]	0x42
arraya[3]	0x45

3. so, need convert ascii :

0x30	0x44	0x42	0x45
0	d	b	e

i use function :

code: [select]

int dectohexstr (int nilai)
{   
             if ((nilai >=48) && (nilai <=57)) //0-9
             {
                   int hexnilai;
                   hexnilai = nilai - '0';
                   return hexnilai;
             }
             else if ((nilai >=65) && (nilai <=70))
             {
                   char hexnilaib;
                   if (nilai == 65) hexnilaib = 65;
                   if (nilai == 66) hexnilaib = 66;
                   if (nilai == 67) hexnilaib = 67;
                   if (nilai == 68) hexnilaib = 68;
                   if (nilai == 69) hexnilaib = 69;
                   if (nilai == 70) hexnilaib = 70;
                   return hexnilaib;
             }
}
4. so, :

0dbe

but, "dbe" still not stored character.
5. how can combined of "0","d","b","e" become 1 hex number = 0x0dbe
6. , convert decimal can send value trough serial port?

have seen this.
http://www.theskyway.net/en/converting-hex-as-a-string-to-actual-hex-values/ 

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