Array and Long manipulations 2

Hi everyone,

Regarding to my previous post:

http://www.keil.com/forum/docs/thread4443.asp


I manage to write a code to suits my needs, the code more likely like this:

command[9] = {0x3C , 0x4A , 0x33 , 0x25 , 0xB1 , 0xD3 , 0x59 , 0x34 , 0x2E }

command2[9] = {0x53 , 0x66 , 0x39 , 0xA2 , 0xB1 , 0xA2 , 0x25 , 0x1E , 0x00 }

//init outside
unsigned char K[5] , P[5] , asciiK[9] , asciiP[9] , tempb[9];
long value , amount , temp;



K[0] = command [5]; K[1] = command [6]; K[2] = command [7]; K[3] = command [8];

P[0] = command [5]; P[1] = command [6]; P[2] = command [7]; P[3] = command [8];

hextoascii (asciiK, K, 4);//convert K to ascii
asciiK[8] = 0x00;//put null terminator
value = strtoul (asciiK, NULL, 16);//convert K to long

hextoascii (asciiP, P, 4);//convert P to ascii
asciiP[8] = 0x00;//put null terminator
amount= strtoul (asciiP, NULL, 16);//convert P to long

temp = value - amount;

sprintf ( tempb, "%08lX\0"  , temp); //copy the long to string with leading zeros
asciitohex(K, tempb , 4);//convert to hex

buf[4] = k[0]; buf[5] = k[1]; buf[6] = k[2]; buf[7] = k[3];

sendcom ( buf , 15);//send to serial function

my hex to ascii and ascii to hex fuction

void hextoascii (unsigned char *des , unsigned char *source , int size)
{

   int i , temp , j;
   i=temp=j = 0;

   for (i=0; i<=size-1; i++)
   {
         temp = source[i];
   		 temp = temp & 0xF0;
		 temp = temp >> 4;

		 //temp = temp + 0x30;
		 temp = digithex[temp];

		 des[j] = temp;
		 j++;

		 temp = source[i];
   		 temp = temp & 0x0F;
		 //temp = temp + 0x30;
		 temp = digithex[temp];
		 des[j] = temp;
		 j++;

	}


}

//*********************************
void asciitohex(unsigned char *des , unsigned char *source , int size)
{
   int i , tmp0 , tmp1, j;
   i= tmp0 = tmp1 = j = 0;

   for (i=0; i<=size-1; i++)
   {
      tmp0 = source[j];
		 if (tmp0 < 0x40)
		 {//its 0 to 9 num
		 	tmp0 = tmp0 - 0x30;
		 }
		 else
		 {//its A to F
			tmp0 = tmp0 - 0x40;
			tmp0 = hex[tmp0];
		 }
	 tmp0 = tmp0 << 4;

	 j++;

	 tmp1 = source[j];
		 if (tmp1 < 0x40)
		 {//its 0 to 9 num
		 	tmp1 = tmp1 - 0x30;
		 }
		 else
		 {//its A to F
			tmp1 = tmp1 - 0x40;
			tmp1 = hex[tmp1];
		 }

	des[i] = tmp0 + tmp1;
	j++;

	}
}

I know my code is long and unprofessional, but it suits my needs.

I there anyone who can simplfy my code

Thanks

Juru Dala