Diff: targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/rtc_api.c

Revision:

15:a81a8d6c1dfe

Child:

18:da299f395b9e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Atmel/TARGET_SAM_CortexM0P/rtc_api.c	Wed Nov 04 16:30:11 2015 +0000
@@ -0,0 +1,116 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "mbed_assert.h"
+#include "rtc_api.h"
+
+#include "cmsis.h"
+#include "system.h"
+
+#include "rtc_count.h"
+
+/* Global RTC instance*/
+static struct rtc_module rtc_instance;
+
+static int rtc_inited = 0;
+
+/* Extern variables */
+extern uint8_t g_sys_init;
+
+/** Initialize the RTC
+ *
+ * Initialize the RTC with default time
+ * @param[void] void
+ */
+void rtc_init(void)
+{
+    if (g_sys_init == 0) {
+        system_init();
+        g_sys_init = 1;
+    }
+
+    struct rtc_count_config config_rtc_count;
+
+    rtc_count_get_config_defaults(&config_rtc_count);
+
+    config_rtc_count.prescaler           = RTC_COUNT_PRESCALER_DIV_1024;
+    config_rtc_count.mode                = RTC_COUNT_MODE_32BIT;
+#ifdef FEATURE_RTC_CONTINUOUSLY_UPDATED
+    config_rtc_count.continuously_update = true;
+#endif
+
+    rtc_count_init(&rtc_instance, RTC, &config_rtc_count);
+
+    rtc_count_enable(&rtc_instance);
+    rtc_inited = 1;
+}
+
+/** Frees the RTC
+ *
+ * @param[void] void
+ */
+void rtc_free(void)
+{
+    if (rtc_inited) {
+        /* Disable the RTC module */
+        rtc_count_disable(&rtc_instance);
+        /* Disable the RTC clock */
+        system_gclk_chan_disable(RTC_GCLK_ID);
+        rtc_inited = 0;
+    }
+}
+
+/** Checks whether RTC is enabled or not
+ *
+ * To check whether RTC module is enabled or not
+ * @param[void] void
+ * @return      Non zero if RTC is already enabled, else zero
+ */
+int rtc_isenabled(void)
+{
+    return rtc_inited;
+}
+
+/** Reads the RTC value
+ *
+ * Reads and return the current time in RTC
+ * @param[void] void
+ * @return      the current value in RTC
+ */
+time_t rtc_read(void)
+{
+    if (!rtc_inited) {
+        /* Return invalid time for now! */
+        return 0;
+    }
+    return (time_t)rtc_count_get_count(&rtc_instance);
+}
+
+/** Write the RTC value
+ *
+ * Update the time value in RTC
+ * @param[in] t The time value to be written
+ * @return      void
+ */
+void rtc_write(time_t t)
+{
+    if (!rtc_inited) {
+        /* Initialize the RTC is not yet initialized */
+        rtc_init();
+    }
+
+    uint32_t count_value = (uint32_t)t;
+    rtc_count_set_count(&rtc_instance, count_value);
+}
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