679 lines
19 KiB
C
679 lines
19 KiB
C
//*****************************************************************************
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//
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// am_hal_rtc.c
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//! @file
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//!
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//! @brief Functions for interfacing with the Real-Time Clock (RTC).
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//!
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//! @addtogroup rtc2 Real-Time Clock (RTC)
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//! @ingroup apollo2hal
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//! @{
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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// Copyright (c) 2017, Ambiq Micro
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 1.2.9 of the AmbiqSuite Development Package.
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//
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//*****************************************************************************
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#include <stdint.h>
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#include <stdbool.h>
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#include "am_mcu_apollo.h"
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//*****************************************************************************
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//
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// Converts a Binary Coded Decimal (BCD) byte to its Decimal form.
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//
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//*****************************************************************************
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static uint8_t
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bcd_to_dec(uint8_t ui8BCDByte)
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{
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return (((ui8BCDByte & 0xF0) >> 4) * 10) + (ui8BCDByte & 0x0F);
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}
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//*****************************************************************************
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//
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// Converts a Decimal byte to its Binary Coded Decimal (BCD) form.
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//
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//*****************************************************************************
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static uint8_t
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dec_to_bcd(uint8_t ui8DecimalByte)
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{
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return (((ui8DecimalByte / 10) << 4) | (ui8DecimalByte % 10));
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}
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//*****************************************************************************
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//
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//! @brief Selects the clock source for the RTC.
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//!
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//! @param ui32OSC the clock source for the RTC.
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//!
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//! This function selects the clock source for the RTC.
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//!
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//! Valid values for ui32OSC are:
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//!
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//! AM_HAL_RTC_OSC_LFRC
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//! AM_HAL_RTC_OSC_XT
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//!
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//! @return None
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//
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//*****************************************************************************
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void
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am_hal_rtc_osc_select(uint32_t ui32OSC)
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{
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//
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// Set XT if flag is set.
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// Otherwise configure for LFRC.
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//
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if (ui32OSC)
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{
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AM_REG(CLKGEN, OCTRL) |= AM_REG_CLKGEN_OCTRL_OSEL_M;
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}
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else
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{
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AM_REG(CLKGEN, OCTRL) &= ~AM_REG_CLKGEN_OCTRL_OSEL_M;
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}
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}
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//*****************************************************************************
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//
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//! @brief Enable/Start the RTC oscillator.
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//!
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//! Starts the RTC oscillator.
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_osc_enable(void)
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{
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//
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// Start the RTC Oscillator.
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//
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AM_REG(RTC, RTCCTL) &= ~AM_REG_RTC_RTCCTL_RSTOP(1);
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}
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//*****************************************************************************
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//
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//! @brief Disable/Stop the RTC oscillator.
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//!
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//! Stops the RTC oscillator.
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_osc_disable(void)
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{
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//
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// Stop the RTC Oscillator.
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//
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AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_RSTOP(1);
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}
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//*****************************************************************************
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//
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//! @brief Configures the RTC for 12 or 24 hour time keeping.
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//!
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//! @param b12Hour - A 'true' configures the RTC for 12 hour time keeping.
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//!
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//! Configures the RTC for 12 (true) or 24 (false) hour time keeping.
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_time_12hour(bool b12Hour)
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{
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//
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// Set the 12/24 hour bit.
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//
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AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_HR1224(b12Hour);
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}
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//*****************************************************************************
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//
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//! @brief Enable selected RTC interrupts.
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//!
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//! @param ui32Interrupt - desired interrupts
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//!
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//! Enables the RTC interrupts.
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//!
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//! ui32Interrupt should be an OR of the following:
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//!
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//! AM_HAL_RTC_INT_ALM
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//! AM_HAL_RTC_INT_OF
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//! AM_HAL_RTC_INT_ACC
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//! AM_HAL_RTC_INT_ACF
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_int_enable(uint32_t ui32Interrupt)
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{
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//
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// Enable the interrupts.
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//
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AM_REG(RTC, INTEN) |= ui32Interrupt;
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}
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//*****************************************************************************
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//
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//! @brief Return the enabled RTC interrupts.
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//!
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//! Returns the enabled RTC interrupts.
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//!
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//! @return enabled RTC interrupts. Return is a logical or of:
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//!
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//! AM_HAL_RTC_INT_ALM
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//! AM_HAL_RTC_INT_OF
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//! AM_HAL_RTC_INT_ACC
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//! AM_HAL_RTC_INT_ACF
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//
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//*****************************************************************************
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uint32_t
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am_hal_rtc_int_enable_get(void)
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{
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//
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// Read the RTC interrupt enable register, and return its contents.
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//
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return AM_REG(RTC, INTEN);
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}
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//*****************************************************************************
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//
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//! @brief Disable selected RTC interrupts.
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//!
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//! @param ui32Interrupt - desired interrupts
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//!
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//! Disables the RTC interrupts.
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//!
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//! ui32Interrupt should be an OR of the following:
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//!
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//! AM_HAL_RTC_INT_ALM
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//! AM_HAL_RTC_INT_OF
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//! AM_HAL_RTC_INT_ACC
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//! AM_HAL_RTC_INT_ACF
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_int_disable(uint32_t ui32Interrupt)
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{
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//
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// Disable the interrupts.
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//
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AM_REG(RTC, INTEN) &= ~ui32Interrupt;
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}
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//*****************************************************************************
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//
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//! @brief Sets the selected RTC interrupts.
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//!
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//! @param ui32Interrupt - desired interrupts
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//!
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//! Sets the RTC interrupts causing them to immediately trigger.
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//!
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//! ui32Interrupt should be an OR of the following:
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//!
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//! AM_HAL_RTC_INT_ALM
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//! AM_HAL_RTC_INT_OF
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//! AM_HAL_RTC_INT_ACC
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//! AM_HAL_RTC_INT_ACF
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_int_set(uint32_t ui32Interrupt)
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{
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//
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// Set the interrupts.
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//
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AM_REG(RTC, INTSET) = ui32Interrupt;
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}
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//*****************************************************************************
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//
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//! @brief Clear selected RTC interrupts.
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//!
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//! @param ui32Interrupt - desired interrupts
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//!
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//! Clears the RTC interrupts.
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//!
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//! ui32Interrupt should be an OR of the following:
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//!
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//! AM_HAL_RTC_INT_ALM
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//! AM_HAL_RTC_INT_OF
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//! AM_HAL_RTC_INT_ACC
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//! AM_HAL_RTC_INT_ACF
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_int_clear(uint32_t ui32Interrupt)
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{
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//
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// Clear the interrupts.
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//
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AM_REG(RTC, INTCLR) = ui32Interrupt;
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}
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//*****************************************************************************
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//
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//! @brief Returns the RTC interrupt status.
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//!
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//! @param bEnabledOnly - return the status of only the enabled interrupts.
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//!
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//! Returns the RTC interrupt status.
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//!
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//! @return Bitwise representation of the current interrupt status.
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//!
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//! The return value will be the logical OR of one or more of the following
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//! values:
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//!
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//! AM_HAL_RTC_INT_ALM
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//! AM_HAL_RTC_INT_OF
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//! AM_HAL_RTC_INT_ACC
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//! AM_HAL_RTC_INT_ACF
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//
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//*****************************************************************************
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uint32_t
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am_hal_rtc_int_status_get(bool bEnabledOnly)
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{
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//
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// Get the interrupt status.
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//
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if (bEnabledOnly)
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{
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uint32_t u32RetVal;
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u32RetVal = AM_REG(RTC, INTSTAT);
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u32RetVal &= AM_REG(RTC, INTEN);
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return u32RetVal &
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(AM_HAL_RTC_INT_ALM | AM_HAL_RTC_INT_OF |
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AM_HAL_RTC_INT_ACC | AM_HAL_RTC_INT_ACF);
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}
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else
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{
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return (AM_REG(RTC, INTSTAT) & (AM_HAL_RTC_INT_ALM |
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AM_HAL_RTC_INT_OF |
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AM_HAL_RTC_INT_ACC |
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AM_HAL_RTC_INT_ACF));
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}
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}
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//*****************************************************************************
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//
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//! @brief Set the Real Time Clock counter registers.
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//!
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//! @param *pTime - A pointer to the time structure.
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//!
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//! Sets the RTC counter registers to the supplied values.
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_time_set(am_hal_rtc_time_t *pTime)
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{
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//
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// Enable writing to the counters.
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//
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AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_WRTC(1);
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//
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// Write the RTCLOW register.
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//
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AM_REG(RTC, CTRLOW) =
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AM_REG_RTC_CTRLOW_CTRHR(dec_to_bcd(pTime->ui32Hour)) |
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AM_REG_RTC_CTRLOW_CTRMIN(dec_to_bcd(pTime->ui32Minute)) |
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AM_REG_RTC_CTRLOW_CTRSEC(dec_to_bcd(pTime->ui32Second)) |
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AM_REG_RTC_CTRLOW_CTR100(dec_to_bcd(pTime->ui32Hundredths));
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//
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// Write the RTCUP register.
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//
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AM_REG(RTC, CTRUP) =
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AM_REG_RTC_CTRUP_CEB((pTime->ui32CenturyEnable)) |
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AM_REG_RTC_CTRUP_CB((pTime->ui32Century)) |
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AM_REG_RTC_CTRUP_CTRWKDY((pTime->ui32Weekday)) |
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AM_REG_RTC_CTRUP_CTRYR(dec_to_bcd((pTime->ui32Year))) |
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AM_REG_RTC_CTRUP_CTRMO(dec_to_bcd((pTime->ui32Month))) |
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AM_REG_RTC_CTRUP_CTRDATE(dec_to_bcd((pTime->ui32DayOfMonth)));
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//
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// Disable writing to the counters.
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//
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AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_WRTC(0);
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}
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//*****************************************************************************
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//
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//! @brief Get the Real Time Clock current time.
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//!
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//! @param *pTime - A pointer to the time structure to store the current time.
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//!
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//! Gets the RTC's current time
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//!
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//! @return 0 for success and 1 for error.
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//
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//*****************************************************************************
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uint32_t
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am_hal_rtc_time_get(am_hal_rtc_time_t *pTime)
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{
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uint32_t ui32RTCLow, ui32RTCUp, ui32Value;
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//
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// Read the upper and lower RTC registers.
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//
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ui32RTCLow = AM_REG(RTC, CTRLOW);
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ui32RTCUp = AM_REG(RTC, CTRUP);
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//
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// Break out the lower word.
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//
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ui32Value =
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((ui32RTCLow & AM_REG_RTC_CTRLOW_CTRHR_M) >> AM_REG_RTC_CTRLOW_CTRHR_S);
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pTime->ui32Hour = bcd_to_dec(ui32Value);
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ui32Value =
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((ui32RTCLow & AM_REG_RTC_CTRLOW_CTRMIN_M) >> AM_REG_RTC_CTRLOW_CTRMIN_S);
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pTime->ui32Minute = bcd_to_dec(ui32Value);
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ui32Value =
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((ui32RTCLow & AM_REG_RTC_CTRLOW_CTRSEC_M) >> AM_REG_RTC_CTRLOW_CTRSEC_S);
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pTime->ui32Second = bcd_to_dec(ui32Value);
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ui32Value =
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((ui32RTCLow & AM_REG_RTC_CTRLOW_CTR100_M) >> AM_REG_RTC_CTRLOW_CTR100_S);
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pTime->ui32Hundredths = bcd_to_dec(ui32Value);
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//
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// Break out the upper word.
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//
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pTime->ui32ReadError =
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((ui32RTCUp & AM_REG_RTC_CTRUP_CTERR_M) >> AM_REG_RTC_CTRUP_CTERR_S);
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pTime->ui32CenturyEnable =
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((ui32RTCUp & AM_REG_RTC_CTRUP_CEB_M) >> AM_REG_RTC_CTRUP_CEB_S);
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pTime->ui32Century =
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((ui32RTCUp & AM_REG_RTC_CTRUP_CB_M) >> AM_REG_RTC_CTRUP_CB_S);
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ui32Value =
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((ui32RTCUp & AM_REG_RTC_CTRUP_CTRWKDY_M) >> AM_REG_RTC_CTRUP_CTRWKDY_S);
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pTime->ui32Weekday = bcd_to_dec(ui32Value);
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ui32Value =
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((ui32RTCUp & AM_REG_RTC_CTRUP_CTRYR_M) >> AM_REG_RTC_CTRUP_CTRYR_S);
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pTime->ui32Year = bcd_to_dec(ui32Value);
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ui32Value =
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((ui32RTCUp & AM_REG_RTC_CTRUP_CTRMO_M) >> AM_REG_RTC_CTRUP_CTRMO_S);
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pTime->ui32Month = bcd_to_dec(ui32Value);
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ui32Value =
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((ui32RTCUp & AM_REG_RTC_CTRUP_CTRDATE_M) >> AM_REG_RTC_CTRUP_CTRDATE_S);
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pTime->ui32DayOfMonth = bcd_to_dec(ui32Value);
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//
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// Was there a read error?
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//
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if (pTime->ui32ReadError)
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{
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return 1;
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}
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else
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{
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return 0;
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}
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}
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//*****************************************************************************
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//
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//! @brief Sets the alarm repeat interval.
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//!
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//! @param ui32RepeatInterval the desired repeat interval.
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//!
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//! Sets the alarm repeat interval.
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//!
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//! Valid values for ui32RepeatInterval:
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//!
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//! AM_HAL_RTC_ALM_RPT_DIS
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//! AM_HAL_RTC_ALM_RPT_YR
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//! AM_HAL_RTC_ALM_RPT_MTH
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//! AM_HAL_RTC_ALM_RPT_WK
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//! AM_HAL_RTC_ALM_RPT_DAY
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//! AM_HAL_RTC_ALM_RPT_HR
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//! AM_HAL_RTC_ALM_RPT_MIN
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//! AM_HAL_RTC_ALM_RPT_SEC
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//! AM_HAL_RTC_ALM_RPT_10TH
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//! AM_HAL_RTC_ALM_RPT_100TH
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//!
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//! @return None.
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//
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//*****************************************************************************
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void
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am_hal_rtc_alarm_interval_set(uint32_t ui32RepeatInterval)
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{
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uint32_t ui32RptInt, ui32Alm100, ui32Value;
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switch(ui32RepeatInterval)
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{
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//
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// If repeat every 10th set RPT and ALM100 field accordinly
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//
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case AM_HAL_RTC_ALM_RPT_10TH:
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ui32RptInt = AM_HAL_RTC_ALM_RPT_SEC;
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ui32Alm100 = AM_HAL_RTC_ALM100_10TH;
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break;
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//
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// If repeat every 100th set RPT and ALM100 field accordinly
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//
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case AM_HAL_RTC_ALM_RPT_100TH:
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ui32RptInt = AM_HAL_RTC_ALM_RPT_SEC;
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ui32Alm100 = AM_HAL_RTC_ALM100_100TH;
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break;
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//
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// Otherwise set RPT as value passed. ALM100 values need to be 0xnn
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// in this setting where n = 0-9.
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//
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default:
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//
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// Get the current value of the ALM100 field.
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//
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ui32Value = AM_BFR(RTC, ALMLOW, ALM100);
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//
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// If ALM100 was previous EVERY_10TH or EVERY_100TH reset to zero
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// otherwise keep previous setting.
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//
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ui32Alm100 = ui32Value >= 0xF0 ? 0 : ui32Value;
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//
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// Set RPT value to value passed.
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//
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ui32RptInt = ui32RepeatInterval;
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break;
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}
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//
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// Write the interval to the register.
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//
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AM_BFW(RTC, RTCCTL, RPT, ui32RptInt);
|
|
|
|
//
|
|
// Write the Alarm 100 bits in the ALM100 register.
|
|
//
|
|
AM_BFW(RTC, ALMLOW, ALM100, ui32Alm100);
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|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Sets the RTC's Alarm.
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|
//!
|
|
//! @param *pTime - A pointer to the time structure.
|
|
//! @param ui32RepeatInterval - the desired alarm repeat interval.
|
|
//!
|
|
//! Set the Real Time Clock Alarm Parameters.
|
|
//!
|
|
//! Valid values for ui32RepeatInterval:
|
|
//!
|
|
//! AM_HAL_RTC_ALM_RPT_DIS
|
|
//! AM_HAL_RTC_ALM_RPT_YR
|
|
//! AM_HAL_RTC_ALM_RPT_MTH
|
|
//! AM_HAL_RTC_ALM_RPT_WK
|
|
//! AM_HAL_RTC_ALM_RPT_DAY
|
|
//! AM_HAL_RTC_ALM_RPT_HR
|
|
//! AM_HAL_RTC_ALM_RPT_MIN
|
|
//! AM_HAL_RTC_ALM_RPT_SEC
|
|
//! AM_HAL_RTC_ALM_RPT_10TH
|
|
//! AM_HAL_RTC_ALM_RPT_EVERY_100TH
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_rtc_alarm_set(am_hal_rtc_time_t *pTime, uint32_t ui32RepeatInterval)
|
|
{
|
|
uint8_t ui8Value = 0;
|
|
|
|
//
|
|
// Write the interval to the register.
|
|
//
|
|
AM_REG(RTC, RTCCTL) |=
|
|
AM_REG_RTC_RTCCTL_RPT(ui32RepeatInterval > 0x7 ? 0x7 : ui32RepeatInterval);
|
|
|
|
//
|
|
// Check if the interval is 10th or every 100th and track it in ui8Value.
|
|
//
|
|
if (ui32RepeatInterval == AM_HAL_RTC_ALM_RPT_10TH)
|
|
{
|
|
ui8Value = 0xF0;
|
|
}
|
|
else if (ui32RepeatInterval == AM_HAL_RTC_ALM_RPT_100TH)
|
|
{
|
|
ui8Value = 0xFF;
|
|
}
|
|
|
|
//
|
|
// Write the ALMUP register.
|
|
//
|
|
AM_REG(RTC, ALMUP) =
|
|
AM_REG_RTC_ALMUP_ALMWKDY((pTime->ui32Weekday)) |
|
|
AM_REG_RTC_ALMUP_ALMMO(dec_to_bcd((pTime->ui32Month))) |
|
|
AM_REG_RTC_ALMUP_ALMDATE(dec_to_bcd((pTime->ui32DayOfMonth)));
|
|
|
|
//
|
|
// Write the ALMLOW register.
|
|
//
|
|
AM_REG(RTC, ALMLOW) =
|
|
AM_REG_RTC_ALMLOW_ALMHR(dec_to_bcd(pTime->ui32Hour)) |
|
|
AM_REG_RTC_ALMLOW_ALMMIN(dec_to_bcd(pTime->ui32Minute)) |
|
|
AM_REG_RTC_ALMLOW_ALMSEC(dec_to_bcd(pTime->ui32Second)) |
|
|
AM_REG_RTC_ALMLOW_ALM100(dec_to_bcd(pTime->ui32Hundredths) | ui8Value);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Get the Real Time Clock Alarm Parameters
|
|
//!
|
|
//! @param *pTime - A pointer to the time structure to store the current alarm.
|
|
//!
|
|
//! Gets the RTC's Alarm time
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_rtc_alarm_get(am_hal_rtc_time_t *pTime)
|
|
{
|
|
uint32_t ui32ALMLow, ui32ALMUp, ui32Value;
|
|
|
|
//
|
|
// Read the upper and lower RTC registers.
|
|
//
|
|
ui32ALMLow = AM_REG(RTC, ALMLOW);
|
|
ui32ALMUp = AM_REG(RTC, ALMUP);
|
|
|
|
//
|
|
// Break out the lower word.
|
|
//
|
|
ui32Value =
|
|
((ui32ALMLow & AM_REG_RTC_ALMLOW_ALMHR_M) >> AM_REG_RTC_ALMLOW_ALMHR_S);
|
|
pTime->ui32Hour = bcd_to_dec(ui32Value);
|
|
|
|
ui32Value =
|
|
((ui32ALMLow & AM_REG_RTC_ALMLOW_ALMMIN_M) >> AM_REG_RTC_ALMLOW_ALMMIN_S);
|
|
pTime->ui32Minute = bcd_to_dec(ui32Value);
|
|
|
|
ui32Value =
|
|
((ui32ALMLow & AM_REG_RTC_ALMLOW_ALMSEC_M) >> AM_REG_RTC_ALMLOW_ALMSEC_S);
|
|
pTime->ui32Second = bcd_to_dec(ui32Value);
|
|
|
|
ui32Value =
|
|
((ui32ALMLow & AM_REG_RTC_ALMLOW_ALM100_M) >> AM_REG_RTC_ALMLOW_ALM100_S);
|
|
pTime->ui32Hundredths = bcd_to_dec(ui32Value);
|
|
|
|
//
|
|
// Break out the upper word.
|
|
//
|
|
pTime->ui32ReadError = 0;
|
|
pTime->ui32CenturyEnable = 0;
|
|
pTime->ui32Century = 0;
|
|
|
|
ui32Value =
|
|
((ui32ALMUp & AM_REG_RTC_ALMUP_ALMWKDY_M) >> AM_REG_RTC_ALMUP_ALMWKDY_S);
|
|
pTime->ui32Weekday = bcd_to_dec(ui32Value);
|
|
|
|
pTime->ui32Year = 0;
|
|
|
|
ui32Value =
|
|
((ui32ALMUp & AM_REG_RTC_ALMUP_ALMMO_M) >> AM_REG_RTC_ALMUP_ALMMO_S);
|
|
pTime->ui32Month = bcd_to_dec(ui32Value);
|
|
|
|
ui32Value =
|
|
((ui32ALMUp & AM_REG_RTC_ALMUP_ALMDATE_M) >> AM_REG_RTC_ALMUP_ALMDATE_S);
|
|
pTime->ui32DayOfMonth = bcd_to_dec(ui32Value);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// End Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|