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The efficiency principle that ISR should follow

2022-07-22 02:52:00 【HelloAaric】

use C Language to write interrupt service program (ISR) Follow the principle of high efficiency ：

 

  1. Interrupt function code should be as concise as possible —— Generally, it is not suitable to write a large number of complex and lengthy code in interrupt functions ;
  2. Try to avoid calling other custom functions inside interrupt functions ;
  3. Try to avoid calling mathematical functions within interrupts —— Because some mathematical functions involve many related library function calls and intermediate variables , Cross calls may occur . When mathematical functions must be used , It can be considered to hand over the complex mathematical function operation task to the main program , The interrupt function references its result through a global variable ;
  4. Macro definition and call —— Call macro in interrupt function , It can reduce the overhead of stack and out of stack in function call .

 

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