Diff: targets/TARGET_STM/lp_ticker.c

Revision:

154:37f96f9d4de2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/lp_ticker.c	Wed Jan 04 16:58:05 2017 +0000
@@ -0,0 +1,83 @@
+/* mbed Microcontroller Library
+ *******************************************************************************
+ * Copyright (c) 2016, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *******************************************************************************
+ */
+#include "device.h"
+
+#if DEVICE_LOWPOWERTIMER
+
+#include "ticker_api.h"
+#include "lp_ticker_api.h"
+#include "rtc_api.h"
+#include "rtc_api_hal.h"
+
+static uint8_t lp_ticker_inited = 0;
+
+void lp_ticker_init(void)
+{
+    if (lp_ticker_inited) return;
+    lp_ticker_inited = 1;
+
+    rtc_init();
+    rtc_set_irq_handler((uint32_t) lp_ticker_irq_handler);
+}
+
+uint32_t lp_ticker_read(void)
+{
+    uint32_t usecs = 0;
+    time_t time = 0;
+
+    lp_ticker_init();
+
+    do {
+        time = rtc_read();
+        usecs = rtc_read_subseconds();
+    } while (time != rtc_read());
+
+    return (time * 1000000) + usecs;
+}
+
+void lp_ticker_set_interrupt(timestamp_t timestamp)
+{
+    uint32_t delta;
+
+    delta = timestamp - lp_ticker_read();
+    rtc_set_wake_up_timer(delta);
+}
+
+void lp_ticker_disable_interrupt(void)
+{
+    rtc_deactivate_wake_up_timer();
+}
+
+void lp_ticker_clear_interrupt(void)
+{
+
+}
+
+#endif