C Memory Addressing

I want to point many variables to particular memory locations in a PIC.

In ASM I do as this


So I know the address of each data1, data2, data3...... etc......

In C language how I point memory address?


In the above I don't know the exact memory address

I use mikroC

Absolute addressing is done with the @ symbol. Look it up in your documentation.... But!!! The whole point of C is you don't need to know where it is..

If you get your head around pointers...


variable now contains 0x22..

Hi thanks for the reply. Actualy I know a bit about pointers.

Actually this is what I'm going to do.Let say I get numbers from 1 to 30.This number I must store in general purpose registers.

GP registers starts (declared) 40h onwards.

If it is 1 then it must store in 41h--now it contains 1
If it is 4 then it must store in 44h--now it contains 4
If it is 12 then it must store in 4Ch--now it contains 12

In assembly I do like this.


I want to do this in C.

Is this ok

That's how I would do it... Remember that a pointer in C IS the same as the address of an array

So


Not that you'll need it in this case.... Its just easier to pass a pointer and receive a pointer when using functions...

Suraj143 said:

Hi thanks for the reply. Actualy I know a bit about pointers.

Actually this is what I'm going to do.Let say I get numbers from 1 to 30.This number I must store in general purpose registers.

GP registers starts (declared) 40h onwards.

If it is 1 then it must store in 41h--now it contains 1
If it is 4 then it must store in 44h--now it contains 4
If it is 12 then it must store in 4Ch--now it contains 12

I want to do this in C.

Click to expand...

If you want to write to memory location 0x40 you can cast that memory adress to a pointer and then write to that location:

(*((uint8_t *)0x40)) = value;

You can use that pointer as an array also:

((uint8_t *)0x40)[index] = value; // write to memory location 0x40+index.