mirror of https://github.com/ARMmbed/mbed-os.git
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
|
|
* Copyright (c) 2018 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 "rtc_api.h"
|
|
#include "platform_devices.h"
|
|
#include "rtc_pl031_drv.h"
|
|
|
|
static uint32_t is_enabled = 0;
|
|
|
|
/**
|
|
* \defgroup hal_rtc RTC hal functions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Initialize the RTC peripheral.
|
|
* The RTC starts counting from 0x0 at reset and increments
|
|
* with a frequency of 1hz (clock source: CLK1HZ).
|
|
* The current value can be read through the DATA register
|
|
*/
|
|
void rtc_init(void)
|
|
{
|
|
rtc_pl031_init(&RTC_PL031_DEV);
|
|
rtc_pl031_dev_enable(&RTC_PL031_DEV);
|
|
is_enabled = 1;
|
|
}
|
|
|
|
/**
|
|
* \brief Deinitialize the RTC peripheral
|
|
* According to DDI0224B_RTC_PL031_TRM.pdf chapter 3.3.4 there is
|
|
* no reason to implement.
|
|
*/
|
|
void rtc_free(void)
|
|
{
|
|
is_enabled = 0;
|
|
}
|
|
|
|
/**
|
|
* \brief Get the RTC enable status
|
|
*
|
|
* \return 0 disabled, 1 enabled
|
|
*/
|
|
int rtc_isenabled(void)
|
|
{
|
|
return is_enabled;
|
|
}
|
|
|
|
/**
|
|
* \brief Get the current time from the RTC peripheral
|
|
*
|
|
* Sysclock and RTC clock may not be in sync which can cause reading
|
|
* out metastable values. It's usually prevented by adding a loop,
|
|
* however PL031 has a syncronisation block to prevent this, therefore
|
|
* no additional loop needed.
|
|
*
|
|
* \return The current time in seconds
|
|
*/
|
|
time_t rtc_read(void)
|
|
{
|
|
uint32_t val;
|
|
rtc_pl031_read_current_time(&RTC_PL031_DEV, &val);
|
|
return (time_t)val;
|
|
}
|
|
|
|
/**
|
|
* \brief Set the current time to the RTC peripheral, write it to LOAD register
|
|
*
|
|
* \param[in] t The current time to be set in seconds
|
|
*/
|
|
|
|
void rtc_write(time_t t)
|
|
{
|
|
rtc_pl031_write_current_time(&RTC_PL031_DEV, (uint32_t)t);
|
|
}
|
|
/**@}*/
|
|
|