rt-thread/bsp/apollo2/libraries/drivers/hal/am_hal_rtc.c

679 lines
19 KiB
C

//*****************************************************************************
//
// am_hal_rtc.c
//! @file
//!
//! @brief Functions for interfacing with the Real-Time Clock (RTC).
//!
//! @addtogroup rtc2 Real-Time Clock (RTC)
//! @ingroup apollo2hal
//! @{
//
//*****************************************************************************
//*****************************************************************************
//
// Copyright (c) 2017, Ambiq Micro
// 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 copyright holder 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.
//
// This is part of revision 1.2.11 of the AmbiqSuite Development Package.
//
//*****************************************************************************
#include <stdint.h>
#include <stdbool.h>
#include "am_mcu_apollo.h"
//*****************************************************************************
//
// Converts a Binary Coded Decimal (BCD) byte to its Decimal form.
//
//*****************************************************************************
static uint8_t
bcd_to_dec(uint8_t ui8BCDByte)
{
return (((ui8BCDByte & 0xF0) >> 4) * 10) + (ui8BCDByte & 0x0F);
}
//*****************************************************************************
//
// Converts a Decimal byte to its Binary Coded Decimal (BCD) form.
//
//*****************************************************************************
static uint8_t
dec_to_bcd(uint8_t ui8DecimalByte)
{
return (((ui8DecimalByte / 10) << 4) | (ui8DecimalByte % 10));
}
//*****************************************************************************
//
//! @brief Selects the clock source for the RTC.
//!
//! @param ui32OSC the clock source for the RTC.
//!
//! This function selects the clock source for the RTC.
//!
//! Valid values for ui32OSC are:
//!
//! AM_HAL_RTC_OSC_LFRC
//! AM_HAL_RTC_OSC_XT
//!
//! @return None
//
//*****************************************************************************
void
am_hal_rtc_osc_select(uint32_t ui32OSC)
{
//
// Set XT if flag is set.
// Otherwise configure for LFRC.
//
if (ui32OSC)
{
AM_REG(CLKGEN, OCTRL) |= AM_REG_CLKGEN_OCTRL_OSEL_M;
}
else
{
AM_REG(CLKGEN, OCTRL) &= ~AM_REG_CLKGEN_OCTRL_OSEL_M;
}
}
//*****************************************************************************
//
//! @brief Enable/Start the RTC oscillator.
//!
//! Starts the RTC oscillator.
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_osc_enable(void)
{
//
// Start the RTC Oscillator.
//
AM_REG(RTC, RTCCTL) &= ~AM_REG_RTC_RTCCTL_RSTOP(1);
}
//*****************************************************************************
//
//! @brief Disable/Stop the RTC oscillator.
//!
//! Stops the RTC oscillator.
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_osc_disable(void)
{
//
// Stop the RTC Oscillator.
//
AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_RSTOP(1);
}
//*****************************************************************************
//
//! @brief Configures the RTC for 12 or 24 hour time keeping.
//!
//! @param b12Hour - A 'true' configures the RTC for 12 hour time keeping.
//!
//! Configures the RTC for 12 (true) or 24 (false) hour time keeping.
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_time_12hour(bool b12Hour)
{
//
// Set the 12/24 hour bit.
//
AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_HR1224(b12Hour);
}
//*****************************************************************************
//
//! @brief Enable selected RTC interrupts.
//!
//! @param ui32Interrupt - desired interrupts
//!
//! Enables the RTC interrupts.
//!
//! ui32Interrupt should be an OR of the following:
//!
//! AM_HAL_RTC_INT_ALM
//! AM_HAL_RTC_INT_OF
//! AM_HAL_RTC_INT_ACC
//! AM_HAL_RTC_INT_ACF
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_int_enable(uint32_t ui32Interrupt)
{
//
// Enable the interrupts.
//
AM_REG(RTC, INTEN) |= ui32Interrupt;
}
//*****************************************************************************
//
//! @brief Return the enabled RTC interrupts.
//!
//! Returns the enabled RTC interrupts.
//!
//! @return enabled RTC interrupts. Return is a logical or of:
//!
//! AM_HAL_RTC_INT_ALM
//! AM_HAL_RTC_INT_OF
//! AM_HAL_RTC_INT_ACC
//! AM_HAL_RTC_INT_ACF
//
//*****************************************************************************
uint32_t
am_hal_rtc_int_enable_get(void)
{
//
// Read the RTC interrupt enable register, and return its contents.
//
return AM_REG(RTC, INTEN);
}
//*****************************************************************************
//
//! @brief Disable selected RTC interrupts.
//!
//! @param ui32Interrupt - desired interrupts
//!
//! Disables the RTC interrupts.
//!
//! ui32Interrupt should be an OR of the following:
//!
//! AM_HAL_RTC_INT_ALM
//! AM_HAL_RTC_INT_OF
//! AM_HAL_RTC_INT_ACC
//! AM_HAL_RTC_INT_ACF
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_int_disable(uint32_t ui32Interrupt)
{
//
// Disable the interrupts.
//
AM_REG(RTC, INTEN) &= ~ui32Interrupt;
}
//*****************************************************************************
//
//! @brief Sets the selected RTC interrupts.
//!
//! @param ui32Interrupt - desired interrupts
//!
//! Sets the RTC interrupts causing them to immediately trigger.
//!
//! ui32Interrupt should be an OR of the following:
//!
//! AM_HAL_RTC_INT_ALM
//! AM_HAL_RTC_INT_OF
//! AM_HAL_RTC_INT_ACC
//! AM_HAL_RTC_INT_ACF
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_int_set(uint32_t ui32Interrupt)
{
//
// Set the interrupts.
//
AM_REG(RTC, INTSET) = ui32Interrupt;
}
//*****************************************************************************
//
//! @brief Clear selected RTC interrupts.
//!
//! @param ui32Interrupt - desired interrupts
//!
//! Clears the RTC interrupts.
//!
//! ui32Interrupt should be an OR of the following:
//!
//! AM_HAL_RTC_INT_ALM
//! AM_HAL_RTC_INT_OF
//! AM_HAL_RTC_INT_ACC
//! AM_HAL_RTC_INT_ACF
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_int_clear(uint32_t ui32Interrupt)
{
//
// Clear the interrupts.
//
AM_REG(RTC, INTCLR) = ui32Interrupt;
}
//*****************************************************************************
//
//! @brief Returns the RTC interrupt status.
//!
//! @param bEnabledOnly - return the status of only the enabled interrupts.
//!
//! Returns the RTC interrupt status.
//!
//! @return Bitwise representation of the current interrupt status.
//!
//! The return value will be the logical OR of one or more of the following
//! values:
//!
//! AM_HAL_RTC_INT_ALM
//! AM_HAL_RTC_INT_OF
//! AM_HAL_RTC_INT_ACC
//! AM_HAL_RTC_INT_ACF
//
//*****************************************************************************
uint32_t
am_hal_rtc_int_status_get(bool bEnabledOnly)
{
//
// Get the interrupt status.
//
if (bEnabledOnly)
{
uint32_t u32RetVal;
u32RetVal = AM_REG(RTC, INTSTAT);
u32RetVal &= AM_REG(RTC, INTEN);
return u32RetVal &
(AM_HAL_RTC_INT_ALM | AM_HAL_RTC_INT_OF |
AM_HAL_RTC_INT_ACC | AM_HAL_RTC_INT_ACF);
}
else
{
return (AM_REG(RTC, INTSTAT) & (AM_HAL_RTC_INT_ALM |
AM_HAL_RTC_INT_OF |
AM_HAL_RTC_INT_ACC |
AM_HAL_RTC_INT_ACF));
}
}
//*****************************************************************************
//
//! @brief Set the Real Time Clock counter registers.
//!
//! @param *pTime - A pointer to the time structure.
//!
//! Sets the RTC counter registers to the supplied values.
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_time_set(am_hal_rtc_time_t *pTime)
{
//
// Enable writing to the counters.
//
AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_WRTC(1);
//
// Write the RTCLOW register.
//
AM_REG(RTC, CTRLOW) =
AM_REG_RTC_CTRLOW_CTRHR(dec_to_bcd(pTime->ui32Hour)) |
AM_REG_RTC_CTRLOW_CTRMIN(dec_to_bcd(pTime->ui32Minute)) |
AM_REG_RTC_CTRLOW_CTRSEC(dec_to_bcd(pTime->ui32Second)) |
AM_REG_RTC_CTRLOW_CTR100(dec_to_bcd(pTime->ui32Hundredths));
//
// Write the RTCUP register.
//
AM_REG(RTC, CTRUP) =
AM_REG_RTC_CTRUP_CEB((pTime->ui32CenturyEnable)) |
AM_REG_RTC_CTRUP_CB((pTime->ui32Century)) |
AM_REG_RTC_CTRUP_CTRWKDY((pTime->ui32Weekday)) |
AM_REG_RTC_CTRUP_CTRYR(dec_to_bcd((pTime->ui32Year))) |
AM_REG_RTC_CTRUP_CTRMO(dec_to_bcd((pTime->ui32Month))) |
AM_REG_RTC_CTRUP_CTRDATE(dec_to_bcd((pTime->ui32DayOfMonth)));
//
// Disable writing to the counters.
//
AM_REG(RTC, RTCCTL) |= AM_REG_RTC_RTCCTL_WRTC(0);
}
//*****************************************************************************
//
//! @brief Get the Real Time Clock current time.
//!
//! @param *pTime - A pointer to the time structure to store the current time.
//!
//! Gets the RTC's current time
//!
//! @return 0 for success and 1 for error.
//
//*****************************************************************************
uint32_t
am_hal_rtc_time_get(am_hal_rtc_time_t *pTime)
{
uint32_t ui32RTCLow, ui32RTCUp, ui32Value;
//
// Read the upper and lower RTC registers.
//
ui32RTCLow = AM_REG(RTC, CTRLOW);
ui32RTCUp = AM_REG(RTC, CTRUP);
//
// Break out the lower word.
//
ui32Value =
((ui32RTCLow & AM_REG_RTC_CTRLOW_CTRHR_M) >> AM_REG_RTC_CTRLOW_CTRHR_S);
pTime->ui32Hour = bcd_to_dec(ui32Value);
ui32Value =
((ui32RTCLow & AM_REG_RTC_CTRLOW_CTRMIN_M) >> AM_REG_RTC_CTRLOW_CTRMIN_S);
pTime->ui32Minute = bcd_to_dec(ui32Value);
ui32Value =
((ui32RTCLow & AM_REG_RTC_CTRLOW_CTRSEC_M) >> AM_REG_RTC_CTRLOW_CTRSEC_S);
pTime->ui32Second = bcd_to_dec(ui32Value);
ui32Value =
((ui32RTCLow & AM_REG_RTC_CTRLOW_CTR100_M) >> AM_REG_RTC_CTRLOW_CTR100_S);
pTime->ui32Hundredths = bcd_to_dec(ui32Value);
//
// Break out the upper word.
//
pTime->ui32ReadError =
((ui32RTCUp & AM_REG_RTC_CTRUP_CTERR_M) >> AM_REG_RTC_CTRUP_CTERR_S);
pTime->ui32CenturyEnable =
((ui32RTCUp & AM_REG_RTC_CTRUP_CEB_M) >> AM_REG_RTC_CTRUP_CEB_S);
pTime->ui32Century =
((ui32RTCUp & AM_REG_RTC_CTRUP_CB_M) >> AM_REG_RTC_CTRUP_CB_S);
ui32Value =
((ui32RTCUp & AM_REG_RTC_CTRUP_CTRWKDY_M) >> AM_REG_RTC_CTRUP_CTRWKDY_S);
pTime->ui32Weekday = bcd_to_dec(ui32Value);
ui32Value =
((ui32RTCUp & AM_REG_RTC_CTRUP_CTRYR_M) >> AM_REG_RTC_CTRUP_CTRYR_S);
pTime->ui32Year = bcd_to_dec(ui32Value);
ui32Value =
((ui32RTCUp & AM_REG_RTC_CTRUP_CTRMO_M) >> AM_REG_RTC_CTRUP_CTRMO_S);
pTime->ui32Month = bcd_to_dec(ui32Value);
ui32Value =
((ui32RTCUp & AM_REG_RTC_CTRUP_CTRDATE_M) >> AM_REG_RTC_CTRUP_CTRDATE_S);
pTime->ui32DayOfMonth = bcd_to_dec(ui32Value);
//
// Was there a read error?
//
if (pTime->ui32ReadError)
{
return 1;
}
else
{
return 0;
}
}
//*****************************************************************************
//
//! @brief Sets the alarm repeat interval.
//!
//! @param ui32RepeatInterval the desired repeat interval.
//!
//! Sets the alarm repeat interval.
//!
//! 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_100TH
//!
//! @return None.
//
//*****************************************************************************
void
am_hal_rtc_alarm_interval_set(uint32_t ui32RepeatInterval)
{
uint32_t ui32RptInt, ui32Alm100, ui32Value;
switch(ui32RepeatInterval)
{
//
// If repeat every 10th set RPT and ALM100 field accordinly
//
case AM_HAL_RTC_ALM_RPT_10TH:
ui32RptInt = AM_HAL_RTC_ALM_RPT_SEC;
ui32Alm100 = AM_HAL_RTC_ALM100_10TH;
break;
//
// If repeat every 100th set RPT and ALM100 field accordinly
//
case AM_HAL_RTC_ALM_RPT_100TH:
ui32RptInt = AM_HAL_RTC_ALM_RPT_SEC;
ui32Alm100 = AM_HAL_RTC_ALM100_100TH;
break;
//
// Otherwise set RPT as value passed. ALM100 values need to be 0xnn
// in this setting where n = 0-9.
//
default:
//
// Get the current value of the ALM100 field.
//
ui32Value = AM_BFR(RTC, ALMLOW, ALM100);
//
// If ALM100 was previous EVERY_10TH or EVERY_100TH reset to zero
// otherwise keep previous setting.
//
ui32Alm100 = ui32Value >= 0xF0 ? 0 : ui32Value;
//
// Set RPT value to value passed.
//
ui32RptInt = ui32RepeatInterval;
break;
}
//
// Write the interval to the register.
//
AM_BFW(RTC, RTCCTL, RPT, ui32RptInt);
//
// Write the Alarm 100 bits in the ALM100 register.
//
AM_BFW(RTC, ALMLOW, ALM100, ui32Alm100);
}
//*****************************************************************************
//
//! @brief Sets the RTC's Alarm.
//!
//! @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.
//! @}
//
//*****************************************************************************