int16 variable rotat_left()

[peterpan]

I have declared a int16 variable and tried to perform a rotate_left() with it. When I try to observe the changes to the int16 variable in "File Register" watch window. I only see the lower 8 bit shfting.
ie.
/*****************************************************/
int16 var1;
var1 = 0x0001;

// so now the var1 should look like 00000000 00000010

for(i=0; i<=8; i++)
rotate_left(&var1, 1);

// the for loop should rotate the 1 into the upper byte

/*****************************************************/

What should I do? Is it something intrinsic of the rotate_left() or the data type int16? Thank you. Appreciate all your help

[Ttelmah]

An int16, is two bytes long. You are telling the command to rotate one byte. You need:

rotate_left(&var1, 2);

You can let the compiler work this out for you (safer if you change data sizes later), using the 'sizeof' command. So:

rotate_left(&var1, sizeof(var1));

ensures the command rotates the entire variable.

Best Wishes

[peterpan]

thank you Ttelmah, it's working