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void sleep_ms(uint32_t ms) |
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| Description ： Wait for the given number of milliseconds before returning.
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Parameters：
ms ： the number of milliseconds to sleep |
| Returns： None |
| Note ： This method attempts to perform a lower power sleep (using WFE)
as much as possible. |
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void sleep_us(uint64_t us) |
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| Description ： Wait for the given number of microseconds before returning. |
Parameters：
us ： the number of microseconds to sleep |
| Returns： None |
| Note ： This method attempts to perform a lower power (WFE) sleep. |
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