X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcpu%2Fcortex-m3%2Fdrv%2Ftimer_lm3s.c;h=ed432e9f6e7b1ef4fa42464997b50159a9d910e2;hb=5b8c7d324c8934f7686aeb4c23454cebbfd1f83f;hp=2d6ee89ac554519d29e6a5455a6da83548ee0235;hpb=bcc49085f310cc8f30075b0f8577767f1668c860;p=bertos.git

diff --git a/bertos/cpu/cortex-m3/drv/timer_lm3s.c b/bertos/cpu/cortex-m3/drv/timer_lm3s.c
index 2d6ee89a..ed432e9f 100644
--- a/bertos/cpu/cortex-m3/drv/timer_lm3s.c
+++ b/bertos/cpu/cortex-m3/drv/timer_lm3s.c
@@ -42,17 +42,12 @@
 #include "irq_lm3s.h"
 #include "timer_lm3s.h"
 
-unsigned long ticks;
+ISR_PROTO_CONTEXT_SWITCH(timer_handler);
 
 INLINE void timer_hw_setPeriod(unsigned long period)
 {
 	ASSERT(period < (1 << 24));
-	HWREG(NVIC_ST_RELOAD) = period;
-}
-
-static void timer_hw_handler(void)
-{
-	ticks++;
+	HWREG(NVIC_ST_RELOAD) = period - 1;
 }
 
 static void timer_hw_enable(void)
@@ -68,8 +63,8 @@ static void timer_hw_disable(void)
 
 void timer_hw_init(void)
 {
-	timer_hw_setPeriod(1000000);
-	sysirq_setHandler(FAULT_SYSTICK, timer_hw_handler);
+	timer_hw_setPeriod(CPU_FREQ / TIMER_TICKS_PER_SEC);
+	sysirq_setHandler(FAULT_SYSTICK, timer_handler);
 	timer_hw_enable();
 }