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Altera_Forum
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16 years ago

LED no reaction after successfully loading lights.c into the cyclone II

Hi, guys, Thank to the previous help from you, finally I managed to load the c program into the cyclone II using Altera Monitor Program without any error message.... The program is as foll...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

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@grit

the problems are due to the caching of the data. The information is only written in the cache and not forwarded to the IO. You could solve your problem either by adding the attribute "volatile" to your IO variable as such: 

#define Switches (volatile char *) 0x0001800# define LEDs (volatile char *) 0x0001810
void main()
{ while (1)
*LEDs = *Switches;
}

or by following the suggestions by Daixiwen.

Hope this helps...

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Hi, Sanmao, Thanks a lot for your adivce. I will try that out. =)