How to access data from Absolute Address

volatile unsigned int bdata ADC _at_ 0x20

volatile unsigned char ReadADC1 _at_ 0x20;

but I was getting DATA SPACE MEMORY OVERLAP
warning!!

Of course you do, you define TWO variables in ONE slot.

Erik

Now how can I access those two bytes from the specified location i.e., 0x20 and 0x21 in order to process the ADC data ?

You might want to consult your favorite C textbook on what a union is, and then use one to achieve the desired effect.

Hi Erik,.

Please suggest me solution to the problem .
how can access the data from those two absolute locations???

If u have some solution plz reply back with some sample code


Thanks,

MURALI

Is the Union only solution to the problem??? or is there any other way we can access the data from the absolute location!!

Could you please send me a sample code how I can access data from union from absolute address ,

I need how It should be initilzed to access those variables??

Is the Union only solution to the problem???

No.

or is there any other way we can access the data from the absolute location!!

You could go the ugly, convoluted and confusing way and use absolute access macros.

If you want to use union, then go for

union uData
{
	unsigned char MSB _at_ 0x20;
	unsigned char LSB _at_ 0x21;

	unsigned int uiValue _at_ 0x20;
};

union uData val1;
void main()
{
val1.LSB = 0xff;
val1.MSB = 0x0f;
while(1);
}

unsigned char MSB _at_ 0x20;
unsigned char LSB _at_ 0x21;
unsigned int uiADC;

void main()
{

	MSB = 0x0f;
	LSB = 0xff;
	uiADC = (MSB*256) + LSB;
}

Thanks a lot for the solution given ,

ADC is working fine with code