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authortmk <nobody@nowhere>2014-06-16 11:12:45 +0900
committertmk <nobody@nowhere>2014-07-30 14:07:43 +0900
commit867f115bee190515aa195dc3e58f1c381ea9695b (patch)
treea738787299cbac2fbaf26e586393f4d4170e8775 /common
parentf15b2691c92e1d9b3c0e59363c803ec540303f37 (diff)
Port timer to mbed
Diffstat (limited to 'common')
-rw-r--r--common/avr/timer.c (renamed from common/timer.c)1
-rw-r--r--common/mbed/timer.c40
-rw-r--r--common/timer.h19
3 files changed, 41 insertions, 19 deletions
diff --git a/common/timer.c b/common/avr/timer.c
index e0dec6cefc..292b41c3a6 100644
--- a/common/timer.c
+++ b/common/avr/timer.c
@@ -18,6 +18,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdint.h>
+#include "timer_avr.h"
#include "timer.h"
diff --git a/common/mbed/timer.c b/common/mbed/timer.c
new file mode 100644
index 0000000000..a64a77239c
--- /dev/null
+++ b/common/mbed/timer.c
@@ -0,0 +1,40 @@
+#include "cmsis.h"
+#include "timer.h"
+
+/* Mill second tick count */
+volatile uint32_t timer_count = 0;
+
+/* Timer interrupt handler */
+void SysTick_Handler(void) {
+ timer_count++;
+}
+
+void timer_init(void)
+{
+ SysTick_Config(SystemCoreClock / 1000); /* 1ms tick */
+}
+
+void timer_clear(void)
+{
+ timer_count = 0;
+}
+
+uint16_t timer_read(void)
+{
+ return (uint16_t)(timer_count & 0xFFFF);
+}
+
+uint32_t timer_read32(void)
+{
+ return timer_count;
+}
+
+uint16_t timer_elapsed(uint16_t last)
+{
+ return TIMER_DIFF_16(timer_read(), last);
+}
+
+uint32_t timer_elapsed32(uint32_t last)
+{
+ return TIMER_DIFF_32(timer_read32(), last);
+}
diff --git a/common/timer.h b/common/timer.h
index 6437473ff7..f0c5ffc98a 100644
--- a/common/timer.h
+++ b/common/timer.h
@@ -20,25 +20,6 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <stdint.h>
-#ifndef TIMER_PRESCALER
-# if F_CPU > 16000000
-# define TIMER_PRESCALER 256
-# elif F_CPU > 2000000
-# define TIMER_PRESCALER 64
-# elif F_CPU > 250000
-# define TIMER_PRESCALER 8
-# else
-# define TIMER_PRESCALER 1
-# endif
-#endif
-#define TIMER_RAW_FREQ (F_CPU/TIMER_PRESCALER)
-#define TIMER_RAW TCNT0
-#define TIMER_RAW_TOP (TIMER_RAW_FREQ/1000)
-
-#if (TIMER_RAW_TOP > 255)
-# error "Timer0 can't count 1ms at this clock freq. Use larger prescaler."
-#endif
-
#define TIMER_DIFF(a, b, max) ((a) >= (b) ? (a) - (b) : (max) - (b) + (a))
#define TIMER_DIFF_8(a, b) TIMER_DIFF(a, b, UINT8_MAX)
#define TIMER_DIFF_16(a, b) TIMER_DIFF(a, b, UINT16_MAX)