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Built-in Functions
Function:
Sets the specified bit (0-7, 0-15 or 0-31) in the given variable. The least significant
bit is 0. This function is the similar to: var |= (1<<bit);
Availability: All devices
Requires:
Examples:
Example
Files:
Also See:
bit_test( )
Syntax:
Nothing
int x;
x=5;
bit_set(x,3);
// x is now 13
ex_patg.c
bit_clear(), bit_test()
value = bit_test ( var , bit )
Parameters: var may be a 8,16 or 32 bit variable (any lvalue)
bit is a number 0- 31 representing a bit number, 0 is the least significant bit.
Returns:
Function:
0 or 1
Tests the specified bit (0-7,0-15 or 0-31) in the given variable. The least
significant bit is 0. This function is much more efficient than, but otherwise similar
to:
((var & (1<<bit)) != 0)
Availability: All devices
Requires:
Examples:
Example
Nothing
if( bit_test(x,3) || !bit_test (x,1) ){
//either bit 3 is 1 or bit 1 is 0
}
if(data!=0)
for(i=31;!bit_test(data, i);i--) ;
// i now has the most significant bit in data
// that is set to a 1
ex_patg.c
153
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