Experts talk about MCU programming ideas

 I have worked on single-chip microcomputer products for two years. In the process of single-chip microcomputer programming, I gradually formed a roughly fixed overall framework, which can also be said to be a programming idea. I now put it forward for your reference.

First, classify the peripheral chips. The programs with the same function or the same chip are modularized and implemented with several fixed functions. Generally, the functions of different chips should not overlap as much as possible, and one function should not cover several chips, so as to facilitate later debugging. If it involves communication between chips, it can be listed separately and processed with special functions;

Secondly, classify the work that needs to be completed in the single-chip microcomputer according to the importance. Generally, I will set two timer interrupts, one of which is about 20ms, which is used to handle some button anti-shake processing, time and date calculation, corresponding flag bits generated after input processing, device refresh, and other things that do not require high real-time requirements but must have time requirements. In addition, set up a timer interrupt of about 1ms, which is mainly used to realize the clock reference and do some operations with high real-time requirements. Generally, it is necessary to set the timer interrupt with high real-time requirements to a high priority, otherwise it cannot be normal operation. If there is a serial interrupt that needs to be processed, the code length in the real-time interrupt needs to be strictly controlled to avoid delaying the processing of the serial interrupt. In addition, if software is used to implement serial port and wireless communication soft decoding, the code length of each part should also be reasonably allocated;

Finally, common event detection, processing and response are implemented in the main program body. This part generally only requires a few parallel functions, and the main program body can be implemented with a few simple lines of code.

I have developed several single-chip microcomputer products using the above structure, including a wireless burglar alarm host with wireless soft decoding, an RS485 repeater (one to 100), an alarm receiver with Chinese display, etc., all of which have achieved stable and effective operation.

I hope some of my experiences can be helpful to you!