Re: [Sdcc-user] Accessing the upper byte of an address parameter.

[Bernhard H. <ber...@be...>]

Accessing the upper byte of an address parameter.>I have a function that
needs to access the upper byte of an address. I am working on writing an
interface to a i2c serial >eeprom, and I would like to pass in an address to
make the function more user friendly. Anyway here is the code I have and
>the errors I get:
>unsigned char eeprom_read(char *readAddr) {
>  unsigned char retVal;
>  unsigned char firstByte;
>  unsigned char secondByte;
> // Calculate first and second bytes.
>  firstByte = (unsigned char)((0xA0) | ((readAddr >> 7) & 0x0E));
>  secondByte = (unsigned char)readAddr;
My 2 cents:

unsigned char firstByte;
unsigned char secondByte;

void foo (char *readAddr)
{
  firstByte  = ((char near *) &readAddr)[0];
  secondByte = ((char near *) &readAddr)[1];
}

Bernhard