Facing problem of array not getting updated immediately

hello everyone,

I am using an array of size 15 which is signed int array and i am updating that array every time a can communication interrupt occurs but the problem is it is not getting updated immediately its taking little bit time to update the buffer.

can anyone explain this issue,and what will be the solution for that.i am using renesas rx231 series uc and E2 studio ide.

thank you.

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KennyMillar over 2 years ago +2

The compiler is probably optimising the reads and writes. At the point where you declare your array, inlcude the 'volatile' keyword: volatile int myArry[15];
michaelkellett over 2 years ago +1

You need to describe the problem in a LOT more detail and include some code extracts so we can see what you are actually doing. You don't even tell us if you are using an RTOS or bare metal coding. …
Workshopshed over 2 years ago in reply to KennyMillar +1

I second the idea of the volatile keyword for variables updated by an interrupt handler.

KennyMillar over 2 years ago

The compiler is probably optimising the reads and writes.

At the point where you declare your array, inlcude the 'volatile' keyword:

volatile int myArry[15];
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michaelkellett over 2 years ago

You need to describe the problem in a LOT more detail and include some code extracts so we can see what you are actually doing.

You don't even tell us if you are using an RTOS or bare metal coding.

MK
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Workshopshed over 2 years ago in reply to KennyMillar

I second the idea of the volatile keyword for variables updated by an interrupt handler.
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Jan Cumps over 2 years ago in reply to Workshopshed

Yes. Values are changed in the interrupt. You need to inform the optimiser.
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