One key power on and power off circuit for MCU.
This circuit is also suitable for use in battery-powered places and can achieve zero standby current.
The high-brightness lamp that I used for decoration before is the kind of circuit that achieves zero current after shutdown. It turns on every time the button is pressed, otherwise it will not consume power.
Posted in category [IoT]
A very small resource needed scheduler for microcontroller, as a little operation system (OS) for MCU.
Advantages are:
1) Super portability, has nothing to do with the CPU, almost any CPU that supports C language programming can be used! (This article only takes 51 single-chip microcomputers as an example, but it can be transplanted arbitrarily.)
2) It is small, the principle is very simple, and you can understand it at a glance.
3) It can be said that it saves RAM and ROM to the extreme.
4) Take the essence of protothread and fuse the timer with the state machine and pseudo-thread syntax into one framework. The task function can be written in two ways.
5) Timer-based triggering, high scheduling efficiency, minimizing invalid code running time.
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Adapt freeRTOS for STM32F107RBT6
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RS232, RS485, RS422, serial port
serial port summary of RS232, RS485, RS422