mbed library sources
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Diff: targets/hal/TARGET_Atmel/TARGET_SAM21/rtc_api.c
- Revision:
- 592:a274ee790e56
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_Atmel/TARGET_SAM21/rtc_api.c Fri Jul 17 09:15:10 2015 +0100 @@ -0,0 +1,118 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2013 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 <math.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); +} \ No newline at end of file