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@@ -45,6 +45,13 @@ static volatile int __rt_errno;
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static rt_device_t _console_device = RT_NULL;
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#endif
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+RT_WEAK void rt_hw_us_delay(rt_uint32_t us)
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+{
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+ (void) us;
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+ RT_DEBUG_LOG(RT_DEBUG_DEVICE, ("rt_hw_us_delay() doesn't support for this board."
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+ "Please consider implementing rt_hw_us_delay() in another file."));
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+}
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+
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/**
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* This function gets the global errno for the current thread.
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*
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