Board index » cppbuilder » Getting Undefined symbol error

2005-02-20 03:52:10 PM
cppbuilder48
Hello, I received some code from the net. When I compile it I receive a
"Undefined symbol P2DIR" for line:
high(SDA);
In the code it looks like P2DIR is defined so I don't know whats going on.
Can someone tell me what's going on and maybe how to work around it so I can
compile and run the code? Thanks.
// Macros to access SDA/SCL lines readably
#define high(a) P2DIR &= ~(a)
#define low(a) P2DIR |= (a)
#define read(a) (P2IN & (a))
char readByte(void){
int i;
char byte;
int inputbit;
high(SDA);
byte = 0;
for (i = 0; i < 8; i++) {
high(SCL);
inputbit = read(SDA);
byte = byte << 1;
if(inputbit){
byte = byte + 1;
}
low(SCL);
}
return byte;
}
 

"Maurice Anderson" < XXXX@XXXXX.COM >wrote:
back to where you got it from and look for how it's defined
because the code you posted does *not* show it's definition
which should preceed the macros.
My guess is that it's a simple WORD.
~ JD
 

that look like?
 

{smallsort}

"Maurice Anderson" < XXXX@XXXXX.COM >wrote:
~ JD
 

On Sat, 19 Feb 2005 23:52:10 -0800, Maurice Anderson wrote:
Hence the error message.
--
Good luck,
liz