2023-01-01 17:32:22 +08:00
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# bsp_dwt
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2023-06-03 21:58:21 +08:00
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DWT是stm32内部的一个"隐藏资源",他的用途是给下载器提供准确的定时,从而为调试信息加上时间戳.并在固定的时间间隔将调试数据发送到你的xxlink上.
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## 常用功能
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### 计算两次进入同一个函数的时间间隔
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```c
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static uint32_t cnt;
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float deltaT;
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deltaT=DWT_GetDeltaT(&cnt);
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```
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### 计算执行某部分代码的耗时
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```c
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float start,end;
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start=DWT_DetTimeline_ms();
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// some proc to go...
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for(uint8_t i=0;i<10;i++)
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foo();
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end = DWT_DetTimeline_ms()-start;
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```
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