Keil forum How can I use a global variable in the Interrupt routine?

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How can I use a global variable in the Interrupt routine?

Nantian Gumo over 20 years ago

The variable is defined in *.h:

static unsigned char cPwLe[3] = {0};

Its value is changed in the Main():

cPwLe[cCh] = Power_Level(cP[cCh]);  //Here  value is right

Its value is transfered to T0 Interrutpt service routine:

cPower = cPwLe[cCh]; //Here value is  always 0

How can I correct the errors?
Thanks all!

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0 Drew Davis over 20 years ago in reply to HansBernhard Broeker

Study the meaning and use of the volatile keyword. Code generated for the main routine might not use the latest value of a variable updated by an ISR unless that variable is declared volatile.
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0 Drew Davis over 20 years ago in reply to HansBernhard Broeker

Study the meaning and use of the volatile keyword. Code generated for the main routine might not use the latest value of a variable updated by an ISR unless that variable is declared volatile.
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