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PCD
_attribute_x
Syntax:
Elements:
Purpose
Examples:
Example Files:
72
_attribute_x
x is the attribute you want to apply. Valid values for x are as follows:
packed
By default each element in a struct or union are padded to be evenly
spaced by the size of 'int'. This is to prevent an address violation when
accessing an element of struct. See the following example:
struct
{
int8 a;
int8 b;
} test;
On architectures where 'int' is 16bit (such as dsPIC or PIC24
PICmicrocontrollers), 'test' would take 4 bytes even though it is
comprised of two 8-bit elements. By applying the 'packed' attribute to
this struct then it would take 2 bytes as originally intended:
struct __attribute__(packed)
{
int8 a;
int8 b;
} test;
Care should be taken by the user when accessing individual elements
of a packed struct – creating a pointer to 'b' in 'test' and attempting to
dereference that pointer would cause an access violation. Any
attempts to read/write 'b' should be done in context of 'test' so the
compiler knows it is packed:
test.b = 5;
aligned(y)
By default the compiler will alocate a variable in the first free memory
location. The aligned attribute will force the compiler to allocate a
location for the specified variable at a location that is modulus of the y
parameter. For example:
int8 array[256] __attribute__(aligned(0x1000));
This will tell the compiler to try to place 'array' at either 0x0, 0x1000,
0x2000, 0x3000, 0x4000, etc.
To alter some specifics as to how the compiler operates
struct attribute__(packed__)
{
int8 a;
int8 b;
} test;
int8 array[256] __attribute__(aligned(0x1000));
None
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