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Update volatile.adoc: Add explanation to examples #712

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Merged
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Sep 23, 2020
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Update volatile.adoc: Add explanation to examples #712

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0650027
Update volatile.adoc: Add explanation to examples
Granjow Dec 1, 2019
a239a51
Update volatile.adoc: Add new code sample
Granjow Dec 8, 2019
34c5c08
volatile.adoc: Add suggestions by @cmaglie
Granjow Sep 23, 2020
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4 changes: 4 additions & 0 deletions Language/Variables/Variable Scope & Qualifiers/volatile.adoc
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Expand Up @@ -55,6 +55,7 @@ There are several ways to do this:
=== Example Code
// Describe what the example code is all about and add relevant code ►►►►► THIS SECTION IS MANDATORY ◄◄◄◄◄

Use a `volatile byte` to store the pin state in a single byte:

[source,arduino]
----
Expand All @@ -77,16 +78,19 @@ void blink() {
}
----

Use an atomic block for atomic access to a 16-bit `int`:

[source,arduino]
----
#include <util/atomic.h> // this library includes the ATOMIC_BLOCK macro.
volatile int input_from_interrupt;

void loop() {
ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
// code with interrupts blocked (consecutive atomic operations will not get interrupted)
int result = input_from_interrupt;
}
}
----


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