How can I define time integer constan ?

Status
Not open for further replies.
B

bianchi77

Advanced Member level 4
Joined
Jun 11, 2009
Messages
1,313
Helped
21
Reputation
44
Reaction score
20
Trophy points
1,318
Location
California
Visit site
Activity points
9,442
Guys,

How can I define time integer constan ?

I define my function :
Code: 
void tone(int freq,int wait)
{
	OCR1A=freq;
	_delay_ms(wait);
}
when I call :
Code: 
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
 

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

Code: 
	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.


+++
 

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
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…