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How to access data from Absolute Address

Murali S



Hi ,

I have used BDATA for my 12 bit ADC program where all the 12 bits are collected at 0x20 by declearing


volatile unsigned int bdata ADC _at_ 0x20

The information of the data accessed from the ADC is stored in the respective locations from the the absolute address.

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

I have initilzed as,

volatile unsigned char ReadADC1 _at_ 0x20;
volatile unsigned char ReadADC2 _at_ 0x21;

but I was getting DATA SPACE MEMORY OVERLAP
warning!!

Please suggest me how can I access two bytes from 0x20 and 0x21.

MURALI

Parents
  • 0 in reply to Murali S

    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);
}

    or simply you can go as

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

void main()
{

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

Reply
  • 0 in reply to Murali S

    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);
}

    or simply you can go as

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

void main()
{

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

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