"Playing with the board" + Zhou Hangci's book Chapter 7, Example 4

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"Playing with the board" + Zhou Hangci's book Chapter 7, Example 4 [Copy link]

 

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the source . Chapter 7: Resource Synchronization

7.1.2: Ensuring Data Integrity

Global variables are the simplest shared resources. Many shared resources have more complex structures, such as structures, arrays, data blocks, etc.

At this time, the integrity of shared resource data is more easily damaged.

Let's look at a calendar clock program: We define a global structure for the PCF8563 clock (including year, month, day, hour, minute, and second).

If a task (such as a display task) needs to display the current time data, it can be read from the calendar clock structure

We use a key task to represent the task that requires calendar clock data. Each time a key is pressed, the time of the key press is displayed.

Contents of the calendar clock.

Partial schematic diagram:

Part of the code:

Effect picture: