[update] usleep supports calling in interrupts.

66b7289e · guozhanxin · 8a274211 · 66b7289e
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components/libc/compilers/common/unistd.c components/libc/compilers/common/unistd.c +8 -1

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--- a/components/libc/compilers/common/unistd.c
+++ b/components/libc/compilers/common/unistd.c
@@ -55,7 +55,14 @@ RTM_EXPORT(sleep);

 int usleep(useconds_t usec)
 {
-    rt_thread_mdelay(usec / 1000u);
+    if (rt_thread_self() != RT_NULL)
+    {
+        rt_thread_mdelay(usec / 1000u);
+    }
+    else
+    {
+        rt_hw_us_delay(usec / 1000u);
+    }
    rt_hw_us_delay(usec % 1000u);
    return 0;
 }