hex values

"i want 16 Byte (sic?) hex address by combining to 8 byte (sic?) hex values"

Don't you mean a 16-bit (ie, 2-byte) value from two 8-bit (ie, 1-byte) values?!

Note that "hex" is irrelevant here - they are just values.

There are 3 approaches:

1. Use the standard 'C' shift operator;

2. Use a union;

3. Use a pointer, and cast it appropriately.

I think that the answers to your previous question can be applied here as well?

sorry, i meant 2 Byte.
when i applied the previous answer i got something else, all i want is to combine the 2 byte's into 1 address. 0x81 0x23 -> 0x8123.

unsigned char buf[4];
unsigned long addr;
union split {unsigned int word;
   struct {unsigned char hi;unsigned char lo;} bytes;};
union split newcount;

buf[0] = 0x81;
buf[1] = 0x23;

newcount.bytes.hi = buf[0];
newcount.bytes.lo = buf[1];
addr = newcount.word;     // output: addr = 0x8123

.

i want to retrieve from this array one hex address
into 'addr' variable.

why not a struct and all is simple.

I see the array named 'buf' but if an array is chosen for serial receive, you can typecast it in the loader

Erik

all i want is to combine the 2 byte's into 1 address. 0x81 0x23 -> 0x8123.

i thing your need is combine two 8bits into 16bit word am i right? ok do like this

short total;
char val1;
char val2;
total=val2;
total= total<<7;
total|=val1;

-KTV

nice.
but it's working this way:

short total;
buf[0] = 0x81;
buf[1] = 0x23;
total = buf[0];
total = total << 8;
total |= buf[1];  // total = 0x8123

no need for struct or union (complicated...)
thanks.

Why not just simplify it to:

short total;

buf[0] = 0x81;
buf[1] = 0x23;

total = buf[0]<<8 | Buf[1]; // total = 0x8123

John, you beat me to it!

Hey!
You are the forth "malund" today!
One big happy family?
Brace yourself, rahib kalib!

Anyone know what the collective noun for a group of Malunds is?

Maybe a project, or a billow or an asylum.

How about using the first letter of each family member's name ?
if you then add an 'A', you get JEANS

:-)

... that my responses "you should not start making a Mars lander before you have mastered 'blinky'" offends you, I pity you

Erik

"... that my responses "you should not start making a Mars lander before you have mastered 'blinky'" offends you, I pity you"

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