[AVR] ATMEGA32 FCPU16000000L Warnings

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ANS HAFEEZ

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i am using ATMEL STUDIO 6 


Code C - [expand]
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#define F_CPU 16000000UL
#include <avr/io.h>
#include <util/delay.h>


when i write this there is No Error No warning and No Message
but whn i write it as 
Code C - [expand]
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#include <avr/io.h>
#include <util/delay.h>
#define F_CPU 16000000UL


Warning 1 #warning "F_CPU not defined for <util/delay.h>" [-Wcpp]
Warning 2 "F_CPU" redefined [enabled by default]


Proteus Simulation is different for bath codes
but i did not get whats the problem is???
 
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delay.h uses F_CPU to calculate number of ticks for exact delay, thats why you need to specify it before delay.h

gaurav
 

You have to define F_CPU above the delay.h header file.

Because delay.h needs it to calculate delay and if you had not defined it, then by default setting will get activated.
Check your delay.h header file, there is a line
Code C - [expand]
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#ifndef F_CPU
#define F_CPU xxxxxx
#endif
 
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