__delay_ms(); in MPLAB X IDE

[redips_id]

Hi Guys,

It says "Unable to resolve identifier __delay_ms". Anyone experience it? How to resolve?
I used the same program in MPLAB IDE 8.83 and there have no problem.

[robosang]

Hi, which compiler? PIC16 with HI-Tech? or MPLAB C18?

[shahrul]

__delay_ms() is for Hi-Tech. I'm not try with MPLab X yet.

[sich]

Haven't migrate to mplabX... Did you successfully compiled the code? Is it only a warning? May be try to include delay.h?

[redips_id]

I'm using MPLAB X IDE + Hi Tech C Compliler. It is only a warning, the compilation is successful. It is ok now after I define it.
#define delay_ms(x) __delay_ms(x)
However it is still a weird, it should be can be used directly without a warning.

[robosang]

That's weird

[yonghui]

hi,

i also see this in mplabx. sometime also other variables shows this warning. however it will compile successfully, so i dont care it yet.


rgds,
yh

[Brian Griffin]

I used the Mplab X IDE and it compiles all-OK despite the __delay_ms() being underlined.

You may need to put "#define _XTAL_FREQ ________" (the empty blank is frequency in hertz) at the start of the code, though.

[tonywk88]

Hi,

Add this code on top of your program.

#ifndef _XTAL_FREQ
#define _XTAL_FREQ 20000000
#endif

#pragma inline(_delay)
extern void _delay(unsigned long);
#define __delay_us(x) _delay((unsigned long)((x)*(_XTAL_FREQ/4000000.0)))
#define __delay_ms(x) _delay((unsigned long)((x)*(_XTAL_FREQ/4000.0)))

It should work after this.

Thanks