New: ticks_to_usec.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

ChangeLog

@@ -1,3 +1,9 @@
+2019-11-18  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* chopstx-cortex-m.c (ticks_to_usec): New.
+	* chopstx-gnu-linux.c (ticks_to_usec): New.
+	* chopstx.c (chx_snooze): Use ticks_to_usec.
+
 2019-11-18  NIIBE Yutaka  <gniibe@fsij.org>
 
 	* rules.mk (CSRC): Change the rule of entry*.c.

chopstx-cortex-m.c

@@ -141,6 +141,12 @@ static uint32_t usec_to_ticks (uint32_t usec)
   return usec * MHZ;
 }
 
+static uint32_t
+ticks_to_usec (uint32_t ticks)
+{
+  return ticks / MHZ;
+}
+
 /*
  * Interrupt Handling
  */

chopstx-gnu-linux.c

@@ -76,6 +76,11 @@ usec_to_ticks (uint32_t usec)
   return usec * MHZ;
 }
 
+static uint32_t
+ticks_to_usec (uint32_t ticks)
+{
+  return ticks / MHZ;
+}
 
 static void
 chx_enable_intr (uint8_t irq_num)

chopstx.c

@@ -688,7 +688,7 @@ chx_snooze (uint32_t state, uint32_t *usec_p)
     *usec_p -= usec0;
   else if (r > 0)
     {
-      *usec_p -= (usec0 - r / MHZ);
+      *usec_p -= (usec0 - ticks_to_usec (r));
       r = 1;
     }