marcus chiou / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_Atmel/TARGET_SAM21/rtc_api.c@592:a274ee790e56, 2015-07-17 (annotated)

Committer:
mbed_official
Date:
Fri Jul 17 09:15:10 2015 +0100
Revision:
592:a274ee790e56
Synchronized with git revision e7144f83a8d75df80c4877936b6ffe552b0be9e6



Full URL: https://github.com/mbedmicro/mbed/commit/e7144f83a8d75df80c4877936b6ffe552b0be9e6/



More API implementation for SAMR21

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 592:a274ee790e56 1 /* mbed Microcontroller Library
mbed_official 592:a274ee790e56 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 592:a274ee790e56 3 *
mbed_official 592:a274ee790e56 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 592:a274ee790e56 5 * you may not use this file except in compliance with the License.
mbed_official 592:a274ee790e56 6 * You may obtain a copy of the License at
mbed_official 592:a274ee790e56 7 *
mbed_official 592:a274ee790e56 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 592:a274ee790e56 9 *
mbed_official 592:a274ee790e56 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 592:a274ee790e56 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 592:a274ee790e56 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 592:a274ee790e56 13 * See the License for the specific language governing permissions and
mbed_official 592:a274ee790e56 14 * limitations under the License.
mbed_official 592:a274ee790e56 15 */
mbed_official 592:a274ee790e56 16 #include "mbed_assert.h"
mbed_official 592:a274ee790e56 17 #include "rtc_api.h"
mbed_official 592:a274ee790e56 18
mbed_official 592:a274ee790e56 19 #include <math.h>
mbed_official 592:a274ee790e56 20
mbed_official 592:a274ee790e56 21 #include "cmsis.h"
mbed_official 592:a274ee790e56 22 #include "system.h"
mbed_official 592:a274ee790e56 23
mbed_official 592:a274ee790e56 24 #include "rtc_count.h"
mbed_official 592:a274ee790e56 25
mbed_official 592:a274ee790e56 26 /* Global RTC instance*/
mbed_official 592:a274ee790e56 27 static struct rtc_module rtc_instance;
mbed_official 592:a274ee790e56 28
mbed_official 592:a274ee790e56 29 static int rtc_inited = 0;
mbed_official 592:a274ee790e56 30
mbed_official 592:a274ee790e56 31 /* Extern variables */
mbed_official 592:a274ee790e56 32 extern uint8_t g_sys_init;
mbed_official 592:a274ee790e56 33
mbed_official 592:a274ee790e56 34 /** Initialize the RTC
mbed_official 592:a274ee790e56 35 *
mbed_official 592:a274ee790e56 36 * Initialize the RTC with default time
mbed_official 592:a274ee790e56 37 * @param[void] void
mbed_official 592:a274ee790e56 38 */
mbed_official 592:a274ee790e56 39 void rtc_init(void)
mbed_official 592:a274ee790e56 40 {
mbed_official 592:a274ee790e56 41 if (g_sys_init == 0) {
mbed_official 592:a274ee790e56 42 system_init();
mbed_official 592:a274ee790e56 43 g_sys_init = 1;
mbed_official 592:a274ee790e56 44 }
mbed_official 592:a274ee790e56 45
mbed_official 592:a274ee790e56 46 struct rtc_count_config config_rtc_count;
mbed_official 592:a274ee790e56 47
mbed_official 592:a274ee790e56 48 rtc_count_get_config_defaults(&config_rtc_count);
mbed_official 592:a274ee790e56 49
mbed_official 592:a274ee790e56 50 config_rtc_count.prescaler = RTC_COUNT_PRESCALER_DIV_1024;
mbed_official 592:a274ee790e56 51 config_rtc_count.mode = RTC_COUNT_MODE_32BIT;
mbed_official 592:a274ee790e56 52 #ifdef FEATURE_RTC_CONTINUOUSLY_UPDATED
mbed_official 592:a274ee790e56 53 config_rtc_count.continuously_update = true;
mbed_official 592:a274ee790e56 54 #endif
mbed_official 592:a274ee790e56 55
mbed_official 592:a274ee790e56 56 rtc_count_init(&rtc_instance, RTC, &config_rtc_count);
mbed_official 592:a274ee790e56 57
mbed_official 592:a274ee790e56 58 rtc_count_enable(&rtc_instance);
mbed_official 592:a274ee790e56 59 rtc_inited = 1;
mbed_official 592:a274ee790e56 60 }
mbed_official 592:a274ee790e56 61
mbed_official 592:a274ee790e56 62 /** Frees the RTC
mbed_official 592:a274ee790e56 63 *
mbed_official 592:a274ee790e56 64 * @param[void] void
mbed_official 592:a274ee790e56 65 */
mbed_official 592:a274ee790e56 66 void rtc_free(void)
mbed_official 592:a274ee790e56 67 {
mbed_official 592:a274ee790e56 68 if (rtc_inited) {
mbed_official 592:a274ee790e56 69 /* Disable the RTC module */
mbed_official 592:a274ee790e56 70 rtc_count_disable(&rtc_instance);
mbed_official 592:a274ee790e56 71 /* Disable the RTC clock */
mbed_official 592:a274ee790e56 72 system_gclk_chan_disable(RTC_GCLK_ID);
mbed_official 592:a274ee790e56 73 rtc_inited = 0;
mbed_official 592:a274ee790e56 74 }
mbed_official 592:a274ee790e56 75 }
mbed_official 592:a274ee790e56 76
mbed_official 592:a274ee790e56 77 /** Checks whether RTC is enabled or not
mbed_official 592:a274ee790e56 78 *
mbed_official 592:a274ee790e56 79 * To check whether RTC module is enabled or not
mbed_official 592:a274ee790e56 80 * @param[void] void
mbed_official 592:a274ee790e56 81 * @return Non zero if RTC is already enabled, else zero
mbed_official 592:a274ee790e56 82 */
mbed_official 592:a274ee790e56 83 int rtc_isenabled(void)
mbed_official 592:a274ee790e56 84 {
mbed_official 592:a274ee790e56 85 return rtc_inited;
mbed_official 592:a274ee790e56 86 }
mbed_official 592:a274ee790e56 87
mbed_official 592:a274ee790e56 88 /** Reads the RTC value
mbed_official 592:a274ee790e56 89 *
mbed_official 592:a274ee790e56 90 * Reads and return the current time in RTC
mbed_official 592:a274ee790e56 91 * @param[void] void
mbed_official 592:a274ee790e56 92 * @return the current value in RTC
mbed_official 592:a274ee790e56 93 */
mbed_official 592:a274ee790e56 94 time_t rtc_read(void)
mbed_official 592:a274ee790e56 95 {
mbed_official 592:a274ee790e56 96 if (!rtc_inited) {
mbed_official 592:a274ee790e56 97 /* Return invalid time for now! */
mbed_official 592:a274ee790e56 98 return 0;
mbed_official 592:a274ee790e56 99 }
mbed_official 592:a274ee790e56 100 return (time_t)rtc_count_get_count(&rtc_instance);
mbed_official 592:a274ee790e56 101 }
mbed_official 592:a274ee790e56 102
mbed_official 592:a274ee790e56 103 /** Write the RTC value
mbed_official 592:a274ee790e56 104 *
mbed_official 592:a274ee790e56 105 * Update the time value in RTC
mbed_official 592:a274ee790e56 106 * @param[in] t The time value to be written
mbed_official 592:a274ee790e56 107 * @return void
mbed_official 592:a274ee790e56 108 */
mbed_official 592:a274ee790e56 109 void rtc_write(time_t t)
mbed_official 592:a274ee790e56 110 {
mbed_official 592:a274ee790e56 111 if (!rtc_inited) {
mbed_official 592:a274ee790e56 112 /* Initialize the RTC is not yet initialized */
mbed_official 592:a274ee790e56 113 rtc_init();
mbed_official 592:a274ee790e56 114 }
mbed_official 592:a274ee790e56 115
mbed_official 592:a274ee790e56 116 uint32_t count_value = (uint32_t)t;
mbed_official 592:a274ee790e56 117 rtc_count_set_count(&rtc_instance, count_value);
mbed_official 592:a274ee790e56 118 }