Defining memory location in Embedded C

[shiva]

help in C

i want to define memory location with my own name.AS it done in case of control register or tomer or SRF.

can i do that in Embedded C.
i m working on 8051.

 

[Gomez]

Re: help in C

That's not defined in the c standard. So each compiler makes that a bit different. Look in your manual to your compiler. It's explained there and I'm sure there are also some examples. Look also in the header file to your controller. Mostly there are defined all important registers.

Gomez

 

[dipal_z]

help in C

Yes, you can do it using pointers

e.g.

unsigned char *shiva = someaddress;
#define SHIVA (*shiva)

Then you can use it as:

SHIVA = 0x55;
*shiva = 0x55;


Is this you are looking for?

 

[amraldo]

Re: help in C

I think u should use pointers but do not forget the keword volatile.
Regards,
Amraldo.

 

[Gomez]

Re: help in C

Yes, you can do it using pointers

e.g.

unsigned char *shiva = someaddress;
#define SHIVA (*shiva)

Then you can use it as:

SHIVA = 0x55;
*shiva = 0x55;


Is this you are looking for?

This construct needs initialisation time.

That's the reason why in the delivered header files all registers are defined so:

#pragma ADDRESS U0MR 3A0h // UART 0 mode register
sfr U0MR = 0x3A0; /* UART 0 mode register */

but that's depend from your compiler.

Gomez