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ROM
All user-callable ROM functions are invoked via the call_trap() function. The C-prototype for this function
is:
Example 7-1. Invoking user-callable ROM functions
typedef union {
void * ptr;
unsigned long val;
} rmf_return_t;
rmf_return_t call_trap(unsigned short fid, void *ptr);
Input parameters are a function ID code (fid) and a void pointer which is internally recast to a structure
type specific to the function being called.
There are 32 bits of data returned. Depending on the function, these may be a pointer to a structure or
simply an unsigned long. When using the rmf_return_t C language data type, the user will need to specify
varName.ptr or varName.val, depending on the data type into which the user needs to cast the result.
It is possible to call ROM functions directly in assembler. An inspection of the call_trap() source code in
the example below shows how this is done. Simply load register D0 with the function ID and A0 with a
structure pointer. Then run the assembler “trap #0” instruction to transfer control to the supervisor routine
associated with that instruction.
The result will be returned in register A0.
Example 7-2. call_trap()
rmf_return_t call_trap(unsigned short fid, void *ptr)
{
rmf_return_t result;
asm {
move.w fid,d0
move.l ptr,a0
trap #0
move.l a0,result
// D0 contains function ID (16 bits)
// A0 contains pointer to structure (32 bits)
// store in local 'result' variable
}
return result;
}
Only predefined, Freescale functions can be called via call_trap(). These are defined in Table 7-39 .
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
101
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