Cortex-M3/M4 has a DWT (Data Watch and Trace Unit) which includes a clock cycle register (CYCCNT) and C-SPY implements a 64-bit cycle register accordingly, CYCLECOUNTER. This register enables accurate and extended measure execution times and combined with C-SPY macros becomes a very useful instrument in developers’ toolbox.
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CYCLECOUNTER
https://www.iar.com/support/reso ... -with-cyclecounter/
精准匹配，可惜是M0的核，不支持这个功能。
https://www.iar.com/support/resources/articles/techniques-for-measuring-the-elapsed-time/
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