Motorola DSP56800 Betriebsanweisung PDF herunterladen (Seite 181)

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101

Inline Assembly Language and Intrinsics

Intrinsic Functions

181Targeting MC56F83xx/DSP5685x Controllers

__mod_access

Retrieve the modulo pointer. The __mod_access function returns the modulo pointer

value specified by <mod_desc> in the R2 register, as per calling conventions. The

value returned is a byte address. The data in the modulo buffer may be read or written

by a cast and dereference of the resulting pointer.

Prototype

void *__mod_access( int <mod_desc>);

Example

Assign a value to the modulo buffer at the current pointer.

*((char *)__mod_access(0)) = (char)i;

__mod_update

Update the modulo pointer. The __mod_update function updates the modulo pointer

by the number of data type units specified in <amount>. <amount> may be negative.

Of course, the pointer will wrap to the beginning of the modulo buffer if the pointer is

advanced beyond the modulo boundaries. <amount> must be a compile time constant.

Prototype

void __mod_update( int <mod_desc>, int <amount>);

Example

Advance the modulo pointer by 2 units.

__mod_access(0, 2);

__mod_stop

Reset modulo addressing to linear addressing. This function writes the modulo control

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