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on-chip xram

amar prem

hello everyone,
i am quite new to programming 8051..hoping to receive some help..
i have a pointer variable.The address stored in this variable resides in the on-chip XRAM.

unsigned char xdata *xloc;

i need the control of my program to be transferred to this address..how can it be done in C???
Thank You in advance for the help..

Parents
  • 0 in reply to Neil Kurzman

    i tried using a function pointer...

    static unsigned int s_addr;
unsigned char xdata *xloc;
void (far *MyFunc)(void)=(void far*)(xloc);

void main (void)
{
  s_addr=get_addr();
  xloc=(unsigned char xdata *)s_addr;
  (*MyFunc)();
}


    but the 3rd line shows error
    MAIN.C(30): error C141: syntax error near '*', expected ')'
    MAIN.C(30): error C129: missing ';' before ')'
    get_addr() is a function which returns the address to which i need to make the jump...

Reply
  • 0 in reply to Neil Kurzman

    i tried using a function pointer...

    static unsigned int s_addr;
unsigned char xdata *xloc;
void (far *MyFunc)(void)=(void far*)(xloc);

void main (void)
{
  s_addr=get_addr();
  xloc=(unsigned char xdata *)s_addr;
  (*MyFunc)();
}


    but the 3rd line shows error
    MAIN.C(30): error C141: syntax error near '*', expected ')'
    MAIN.C(30): error C129: missing ';' before ')'
    get_addr() is a function which returns the address to which i need to make the jump...

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