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-rw-r--r--cpu/at32ap/interrupts.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/cpu/at32ap/interrupts.c b/cpu/at32ap/interrupts.c
index bef1f30..160838e 100644
--- a/cpu/at32ap/interrupts.c
+++ b/cpu/at32ap/interrupts.c
@@ -98,18 +98,16 @@ void set_timer(unsigned long t)
*/
void udelay(unsigned long usec)
{
- unsigned long now, end;
+ unsigned long cycles;
+ unsigned long base;
+ unsigned long now;
- now = sysreg_read(COUNT);
+ base = sysreg_read(COUNT);
+ cycles = ((usec * (get_tbclk() / 10000)) + 50) / 100;
- end = ((usec * (get_tbclk() / 10000)) + 50) / 100;
- end += now;
-
- while (now > end)
- now = sysreg_read(COUNT);
-
- while (now < end)
+ do {
now = sysreg_read(COUNT);
+ } while ((now - base) < cycles);
}
static int set_interrupt_handler(unsigned int nr, void (*handler)(void),