"Playing with the board" + Zhou Hangci's book Chapter 8, Example 4

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"Playing with the board" + Zhou Hangci's book Chapter 8, Example 4 [Copy link]

 

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Chapter 8: Data Communication

In many cases, the party sending the message is the ISR, which requires special attention:

If the local variable of ISR is used to save the message, the party receiving the message cannot obtain the real message.

When the recipient of the message obtains the message pointer, the ISR has ended and its local variables disappear as well.

There are three ways for ISR to reliably send messages:

1. Save the message in a global variable;

2. Save the message in a static local variable of the ISR;

3. Send the message content as a pointer.

Now consider the first case. The disadvantage of this case is that the variable definition is separated from the ISR code, and the program readability decreases.

Partial schematic diagram:

The button 5 used in the program, the sensor is DS18B20.

Part of the code:

Rendering:

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