Update timer.rs

tkf2019 · web-flow · commit d369a28c7bf0 · 2024-03-05T14:33:56.000+08:00
diff --git a/os/src/timer.rs b/os/src/timer.rs
@@ -26,7 +26,7 @@ pub fn get_time_ms() -> usize {
 /// get current time in microseconds
 #[allow(dead_code)]
 pub fn get_time_us() -> usize {
-    time::read() / (CLOCK_FREQ / MICRO_PER_SEC)
+    time::read() * MICRO_PER_SEC / CLOCK_FREQ
 }
 
 /// Set the next timer interrupt

Original file line number	Diff line number	Diff line change
`@@ -26,7 +26,7 @@ pub fn get_time_ms() -> usize {`
`26`	`26`	`/// get current time in microseconds`
`27`	`27`	`#[allow(dead_code)]`
`28`	`28`	`pub fn get_time_us() -> usize {`
`29`		`- time::read() / (CLOCK_FREQ / MICRO_PER_SEC)`
	`29`	`+ time::read() * MICRO_PER_SEC / CLOCK_FREQ`
`30`	`30`	`}`
`31`	`31`
`32`	`32`	`/// Set the next timer interrupt`