# SWD interface IAR EWARM single-step debugging

1.If you add a breakpoint in the code.

![](https://1339817493-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRMO1SOVoE1wKC5%2F-M2HWuqfjq-tAqyjGf2g%2F-M2HX5pjRk9YCqsOFLc7%2Fswd%2014.png?generation=1584080164270348\&alt=media)

2.Then, after the above download will automatically enter debug mode.

![](https://1339817493-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRMO1SOVoE1wKC5%2F-M2HWuqfjq-tAqyjGf2g%2F-M2HX5pl1A4YnaF7cKeq%2Fswd%2015.png?generation=1584080164532063\&alt=media)

3.According to their own needs to control the program single-step operation into a function out of a function, and other operations running at full speed

![](https://1339817493-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M2HWtRMO1SOVoE1wKC5%2F-M2HWuqfjq-tAqyjGf2g%2F-M2HX5pnrX1XG52tS8bj%2Fswd%2016.png?generation=1584080164314916\&alt=media)


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