| /****************************************************************************** |
| * Filename: aon_rtc.c |
| * Revised: 2016-02-29 13:43:37 +0100 (Mon, 29 Feb 2016) |
| * Revision: 45791 |
| * |
| * Description: Driver for the AON RTC. |
| * |
| * Copyright (c) 2015 - 2016, Texas Instruments Incorporated |
| * 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 the ORGANIZATION 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 <driverlib/aon_rtc.h> |
| #include <driverlib/cpu.h> |
| |
| //***************************************************************************** |
| // |
| // Handle support for DriverLib in ROM: |
| // This section will undo prototype renaming made in the header file |
| // |
| //***************************************************************************** |
| #if !defined(DOXYGEN) |
| #undef AONRTCCurrentCompareValueGet |
| #define AONRTCCurrentCompareValueGet NOROM_AONRTCCurrentCompareValueGet |
| #undef AONRTCCurrent64BitValueGet |
| #define AONRTCCurrent64BitValueGet NOROM_AONRTCCurrent64BitValueGet |
| #endif |
| |
| |
| //***************************************************************************** |
| // |
| // Get the current value of the RTC counter in a format compatible to the compare registers. |
| // |
| //***************************************************************************** |
| uint32_t |
| AONRTCCurrentCompareValueGet( void ) |
| { |
| uint32_t ui32CurrentSec ; |
| uint32_t ui32CurrentSubSec ; |
| uint32_t ui32SecondSecRead ; |
| |
| // |
| // Reading SEC both before and after SUBSEC in order to detect if SEC incremented while reading SUBSEC |
| // If SEC incremented, we can't be sure which SEC the SUBSEC belongs to, so repeating the sequence then. |
| // |
| do { |
| ui32CurrentSec = HWREG( AON_RTC_BASE + AON_RTC_O_SEC ); |
| ui32CurrentSubSec = HWREG( AON_RTC_BASE + AON_RTC_O_SUBSEC ); |
| ui32SecondSecRead = HWREG( AON_RTC_BASE + AON_RTC_O_SEC ); |
| } while ( ui32CurrentSec != ui32SecondSecRead ); |
| |
| return (( ui32CurrentSec << 16 ) | ( ui32CurrentSubSec >> 16 )); |
| } |
| |
| //***************************************************************************** |
| // |
| // Get the current 64-bit value of the RTC counter. |
| // |
| //***************************************************************************** |
| uint64_t |
| AONRTCCurrent64BitValueGet( void ) |
| { |
| union { |
| uint64_t returnValue ; |
| uint32_t secAndSubSec[ 2 ] ; |
| } currentRtc ; |
| uint32_t ui32SecondSecRead ; |
| |
| // |
| // Reading SEC both before and after SUBSEC in order to detect if SEC incremented while reading SUBSEC |
| // If SEC incremented, we can't be sure which SEC the SUBSEC belongs to, so repeating the sequence then. |
| // |
| do { |
| currentRtc.secAndSubSec[ 1 ] = HWREG( AON_RTC_BASE + AON_RTC_O_SEC ); |
| currentRtc.secAndSubSec[ 0 ] = HWREG( AON_RTC_BASE + AON_RTC_O_SUBSEC ); |
| ui32SecondSecRead = HWREG( AON_RTC_BASE + AON_RTC_O_SEC ); |
| } while ( currentRtc.secAndSubSec[ 1 ] != ui32SecondSecRead ); |
| |
| return ( currentRtc.returnValue ); |
| } |