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converting long to hex

 
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MAKInnovation



Joined: 16 Nov 2010
Posts: 61

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converting long to hex
PostPosted: Sat Jan 25, 2014 2:21 am     Reply with quote
Dear Friends;
I want to convert long int value into an Hex value.
and then i have to send two bytes on the serial port.

For example the int value is 635. then i have to convert it into an hex value i.e 27B.

Then i have to send it to the serial port on two bytes, one would be 7B and second would be 02.

Can anyone know the simple conversion code.
Thanks
Ashraf
Ttelmah



Joined: 11 Mar 2010
Posts: 19504

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PostPosted: Sat Jan 25, 2014 2:56 am     Reply with quote
Step back.

A _long_ int, implies 16bits, so four hex digits, not two.

printf can output a long just as easily as a short integer:
Code:

   int16 val=635;

   printf("%04LX", val);

will send 027B over the serial. Four hex digits.

However you seem to be confusing hex with raw bytes.

Val in memory, comprises the two bytes '01111011', and '00000010', which can be represented as '7B', and '02' in hex. So for what you describe you only need to send the bytes. No 'conversion' required at all:
Code:

   union {
      int8 b[2];
      int16 w;
  } access;

  access.w=635;
  putc(access.b[0]);
  putc(access.b[1]);

  //Or use the CCS function 'make8'
  int16 val=635;

  putc(make8(val,0)); //send the first byte
  putc(make8(val,1)); //send the second


You are just sending raw binary, no 'hex' involved.

The advantage of the union, is that it can also be used the other way, so if you write values to access.b[0], and access.b[1], then access.w, contains the 16bit value.

Best Wishes
MAKInnovation



Joined: 16 Nov 2010
Posts: 61

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PostPosted: Sat Jan 25, 2014 3:47 am     Reply with quote
I am now getting the correct value. Thanks for your help Smile
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