Re: Where can I get a code sample for MPC555 PMM & PSP(in C language)?

--- In [email protected], "murphynetuk" <murphynetuk@y...> wrote:
> Any C code you may come across for the TPU will simply be a macro 
> mapping to direct writes to the memory-mapped registers of the TPU.
> So e.g. to write to the PRAM[5][5] of TPU_A
> 
> e.g. from the TPUPN14 appnote:
>   PRAM5_5 equ $ffff4a  ->  is just assigning a convenient name to 
> $ffff4a (note this is the address for a 68332 NOT an MPC5XX)
>   move.w #$0200,(PRAM5_5).l  ->  is writing the value '$200' to 
this 
> location
> 
> e.g. from the MPC5XX header files:
>   TPU_A.PARM.R[5][5] = $200;
> (the header files will assign the correct address for you)
> With the Macro expanded this becomes:
> (*( struct TPU3_tag *) (0x00000000 + 0x304000)) .PARM.R[5][5] = 
0x200;
> Which compiles to:
> 
> e.g. from the MPC5XX 'quickstart' app:
>   TPUSetParam(TPU_A, PSP, HIGH_TIME, $200);
> (the quickstart code maps everything conveniently by name)
> With the Macro expanded this becomes:
> *TPU_A_PRMADDR_PSP_HIGH_TIME_CFG0 = 0x200;
> Which again compiles to:
> li       r0,512
> lis      r3,48
> sth      r0,16730(r3)
> 
> So it's all the same!
> Learning and understanding that all you are ever doing is reading / 
> writing memory-mapped registers is key to TPU programming.
> Ian

I got it, murphynetuk, thanks a lot...
So I can write it myself. :)




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