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String number to hex expression

 
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cvargcal



Joined: 17 Feb 2015
Posts: 134

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String number to hex expression
PostPosted: Fri Dec 24, 2021 6:34 pm     Reply with quote

Hi, I need to convert any "data hex" string to expression hex but as number.

example:

one string has this "0E2010624804C11" , but i need only the 4 last data so in a variable is copied the last 4 data, for after show like hex for can convert to decimal.


Code:


int8 BCDtobin(int8 val)
{
   //take a single byte coded as two BCD digits and return the binary value
   int8 temp;
   temp=val;
   swap(temp);
   temp&=0xF;  //high nibble
   temp*=2;
   temp=temp+(temp*4); //efficient *10 *8+*2
   temp+=(val&0xF); //add the low nibble
   return temp;
}


int16 BCDtoLongbin(int16 val)
{
   //Now convert a 16bit BCD value to 16bit result;
   int16 ltemp, ltemp2;
   ltemp=BCDtobin(make8(val,0)); //convert the MSB
   //now need *100.
   ltemp*=4;
   ltemp2=ltemp*8;
   ltemp=ltemp+ltemp2+(ltemp2*2); //efficient *100 -> *64+*32+*4
   ltemp+=BCDtobin(make8(val,1)); //now the LSB
   return ltemp;
}

void main()
{
 
char fullData ="0E2010624804C11"
char string ="4c11";
int16 result =0x4c11

   int16 testval;
   testval=0x4c11;
   testval=BCDtoLongbin(testval);  // testval=19473
 
   while(TRUE) ;   
}





thanks any help.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Dec 24, 2021 8:34 pm     Reply with quote

This sample code shows how to do it.
Code:

#include <18F46K22.h>
#fuses NOWDT 
#use delay(internal=4M)
#use rs232(UART1, baud=9600, ERRORS)

#include <ctype.h>

//-------------------------------------------------
// Ascii to unsigned long -
// Converts a string of 1 to 4 ascii hex characters to an
// unsigned long (16-bit) value.

int16 axtoul(char *ptr)
{
char i, temp;
int16 result;

result = 0;

for(i = 0; i < 4; i++)           // Convert a maximum of 4 hex digits
   {
    temp = toupper(*ptr++);      // Get the char.  Convert to upper case
    if(isxdigit(temp) == FALSE)  // Is ascii char a hex digit ?
       break;         // Break if not
    temp -= '0';      // Convert the char to binary
    if(temp > 9)
       temp -= 7;
    result <<= 4;      // shift existing value left 1 nybble
    result |= temp;    // Then combine it with new nybble
   }

return(result);
}

//=================================
void main()
{
int8 buffer[] = "4c11";   
int16 result;

result = axtoul(buffer);

printf("result = %lu \r", result);

while(TRUE);
}
cvargcal



Joined: 17 Feb 2015
Posts: 134

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PostPosted: Sat Dec 25, 2021 9:19 pm     Reply with quote

PCM programmer wrote:
This sample code shows how to do it.
.....


Thanks!!
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