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Description: 七彩LED指示灯，通电后，按开关开启后，每隔四秒钟LED闪一次，且每次闪的颜色可以变化可以组合出多种颜色循环。七彩LED灯用红绿蓝三色的共阳LED灯，驱动直接用78P153的I/0。-Colorful LED lights, electricity, press switch to open, the LED flash every four seconds once, and each flash can change the color of a variety of colors can be combined cycle. Colorful LED lights with red and green and blue LED lights for a total of Shenyang, the 78P153 drive directly I/0.
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Size: 1024 |
Author: james |
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Description: 上一节讲了利用累计定时中断次数实现LED灯闪烁，这个例子同时也第一次展示了我最完整的实战程序框架：
用switch语句实现状态机，外加定时中断。这个框架看似简单，实际上就是那么简单。我做的所有开发项目都是基于这个简单框架，
但是非常好用。上一节只有一个单任务的LED灯在闪烁，这节开始，我们多增加一个蜂鸣器报警的任务，要教会大家四个知识点：
第一点：蜂鸣器的驱动程序框架编写。
第二点：多任务处理的程序框架。
第三点：如何控制蜂鸣器声音的长叫和短叫。
第四点：如何知道1秒钟需要多少个定时中断，也就是如何按比例修正时间精度。
具体内容，请看源代码讲解。
实现功能：同时跑两个任务，第一个任务让一个LED灯1秒钟闪烁一次。第二个任务让蜂鸣器在前面3秒发生一次短叫报警，在后面6秒发生一次长叫报警，反复循环。
-Speaking on a cumulative timer interrupt frequency using LED lights flashing, this example also shows my first real full procedural framework:
With a switch statement to achieve a state machine, plus a timer interrupt. This framework may seem simple, actually so simple. I do all the development projects are based on this simple framework,
But it is very easy to use. Previous section only a single task LED lights flashing, this festival started, we multi-task a buzzer alarm increases, the knowledge to teach you four points:
First point: Driver Framework buzzer preparation.
The second point: the procedural framework of multi-tasking.
The third point: how to control the buzzer sounds and the short length is called is called.
The fourth point: How do you know how much a 1 second timer interrupt, which is how a pro rata correction time accuracy.
Details, see the source code to explain.
Function: run two tasks simultaneously, the first task to make a LED light fla
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Size: 3072 |
Author: 高飞 |
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