Update timer.rs

田凯夫 · 田凯夫 · commit befccb262c76 · 2024-03-05T19:05:31.000+08:00
diff --git a/os/src/timer.rs b/os/src/timer.rs
@@ -19,13 +19,13 @@ pub fn get_time() -> usize {
 /// get current time in milliseconds
 #[allow(dead_code)]
 pub fn get_time_ms() -> usize {
-    time::read() / (CLOCK_FREQ / MSEC_PER_SEC)
+    time::read() * MSEC_PER_SEC / CLOCK_FREQ
 }
 
 /// 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
`@@ -19,13 +19,13 @@ pub fn get_time() -> usize {`
`19`	`19`	`/// get current time in milliseconds`
`20`	`20`	`#[allow(dead_code)]`
`21`	`21`	`pub fn get_time_ms() -> usize {`
`22`		`- time::read() / (CLOCK_FREQ / MSEC_PER_SEC)`
	`22`	`+ time::read() * MSEC_PER_SEC / CLOCK_FREQ`
`23`	`23`	`}`
`24`	`24`
`25`	`25`	`/// get current time in microseconds`
`26`	`26`	`#[allow(dead_code)]`
`27`	`27`	`pub fn get_time_us() -> usize {`
`28`		`- time::read() / (CLOCK_FREQ / MICRO_PER_SEC)`
	`28`	`+ time::read() * MICRO_PER_SEC / CLOCK_FREQ`
`29`	`29`	`}`
`30`	`30`
`31`	`31`	`/// Set the next timer interrupt`