Hello, I use uVision IDE and arm-gcc toolchain for my lpc2129 board.I mapped the CAN standard filters to an area in memory:
#define StandardFilter[2] (*((volatile unsigned long *) 0xE0038000));
However in my main program the follwing syntax seems to be incorrect:
StandardFilter[0] = 0x20012002;//this is line no.57 StandardFilter[1] = 0x20032004;
because the compiler throws the following error: CAN_RX.c(57): error: parse error before '[' token
Could someone tell me what the correct syntax is? Thank you.
No.
"as per C conventions?"
Look again at Per's previous post: the Preprocessor is entirely independent of the 'C' language - a #define is not a 'C' statement.
That was, in fact, exactly the point that I was making in the link that I gave; have a look again: www.8052.com/.../29152 - it's standard 'C' stuff, nothing specifically to do with 8051, ARM, or Keil.
You could, if you wanted, have:
#define SEMICOLON ;
think about it...
#define BEGIN { #define END } #define IF if ( #define THEN ) { BEGIN IF a > 10 THEN ... END END
A preprocessor is very powerful, which means that you must always think twice about how you use it. Too much clever use will often result in unhappy faces at a later stage of the sw lifespan.
Ok...I now understand.Thank you for the inputs.