How can I define time integer constan ?

[bianchi77]

Guys,

How can I define time integer constan ?

I define my function :

void tone(int freq,int wait)
{
	OCR1A=freq;
	_delay_ms(wait);
}

when I call :

tone(0,1000);

I got :

Error 7 __builtin_avr_delay_cycles expects a compile time integer constant c:\program files (x86)\atmel\atmel toolchain\avr8 gcc\native\3.4.2.939\avr8-gnu-toolchain\bin\../lib/gcc/avr/4.7.2/../../../../avr/include/util/delay.h 164 28 main_buzzer

Any ideas on how to rectify it ?

thanks

 

[andre_luis]

Were you call tone(0,1000), replace it directly by lines bellow instead :

	int freq = 0 ;
        int wait = 1000 ;
        OCR1A=freq;
	_delay_ms(wait);

This way you can determine whose of these lines are the responsible for the above error.


+++

 

[keith1200rs]

It sounds like _delay_ms() is a macro which needs to know the value at compile time - you cannot supply it with a variable.

Keith