Rom Array Bug?

[teejaydub 0]

I've been able to use rom character arrays in other modules, but I'm having trouble with the code below. It looks correct to me, if I'm understanding the 'rom' keyword correctly. Is this a compiler bug, or am I overlooking something?

 

Source:

 

unsigned char crc;

// CRC arrays for the nibble-wise routine.
rom char* r1 = {
0x00, 0x5e, 0xbc, 0xe2, 0x61, 0x3f, 0xdd, 0x83, 
0xc2, 0x9c, 0x7e, 0x20, 0xa3, 0xfd, 0x1f, 0x41, 
};

rom char* r2 = {
0x00, 0x9d, 0x23, 0xbe, 0x46, 0xdb, 0x65, 0xf8,
0x8c, 0x11, 0xaf, 0x32, 0xca, 0x57, 0xe9, 0x74
};

unsigned char crc8(unsigned char data)
{
unsigned char i = (data ^ crc);

crc = r1[i & 0xf] ^ r2[i >> 4];
return crc;
}

 

I get these errors:

 

failure
...\romArrayBug.c(19:8): error: failed to generate expression
...\romArrayBug.c(19:8): error: invalid operand 'r1[i & 0xf] '
...\romArrayBug.c(19:20): error: failed to generate expression
...\romArrayBug.c(19:20): error: invalid operand '^ '
...\romArrayBug.c(19:6): error: failed to generate expression

 

IDE version: 6.60

Compiler: BoostC 6.60

Target device: PIC16F688

OS: XP Pro SP2

[wally 0]

Could this happen because of the comma after the last r1 element?

 

Regards,

 

Wally

[teejaydub 0]

Could this happen because of the comma after the last r1 element?

 

Regards,

 

Wally

<{POST_SNAPBACK}>

 

No - removing the comma doesn't fix it. (And that's legal C anyway.)

[Dave 0]

I get these errors:

 

failure
...\romArrayBug.c(19:8): error: failed to generate expression
...\romArrayBug.c(19:8): error: invalid operand 'r1[i & 0xf] '
...\romArrayBug.c(19:20): error: failed to generate expression
...\romArrayBug.c(19:20): error: invalid operand '^ '
...\romArrayBug.c(19:6): error: failed to generate expression

<{POST_SNAPBACK}>

Missing #include <system.h> ?

 

Regards

Dave

[teejaydub 0]

Missing #include <system.h> ?

<{POST_SNAPBACK}>

 

Yup! Didn't know it was required for that keyword. Thanks!