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//*****************************************************************************
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//
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//! @file rtc_print.c
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//!
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//! @brief Example using the internal RTC.
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//!
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//! This example demonstrates how to interface with the RTC and prints the
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//! time over SWO.
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//!
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//! The example works by configuring a timer interrupt which will periodically
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//! wake the core from deep sleep. After every interrupt, it prints the current
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//! RTC time.
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//!
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//*****************************************************************************
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//*****************************************************************************
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//
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// Copyright (c) 2019, 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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// Third party software included in this distribution is subject to the
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// additional license terms as defined in the /docs/licenses directory.
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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 v2.2.0-7-g63f7c2ba1 of the AmbiqSuite Development Package.
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//
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//*****************************************************************************
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#include "am_mcu_apollo.h"
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#include "am_bsp.h"
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#include "am_util.h"
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//
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// String arrays to index Days and Months with the values returned by the RTC.
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//
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char *pcWeekday[] =
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{
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"Sunday",
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"Monday",
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"Tuesday",
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"Wednesday",
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"Thursday",
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"Friday",
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"Saturday",
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"Invalid day"
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};
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char *pcMonth[] =
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{
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"January",
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"February",
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"March",
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"April",
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"May",
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"June",
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"July",
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"August",
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"September",
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"October",
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"November",
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"December",
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"Invalid month"
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};
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//*****************************************************************************
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//
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// Timer configurations.
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//
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//*****************************************************************************
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am_hal_ctimer_config_t g_sTimer0 =
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{
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// Don't link timers.
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0,
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// Set up TimerA0.
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(AM_HAL_CTIMER_FN_REPEAT |
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AM_HAL_CTIMER_INT_ENABLE |
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AM_HAL_CTIMER_LFRC_32HZ),
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// No configuration required for TimerB0.
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0,
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};
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am_hal_rtc_time_t hal_time;
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uint32_t g_LastSecond = 0;
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uint32_t g_TestCount = 0;
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//*****************************************************************************
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//
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// Init function for Timer A0.
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//
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//*****************************************************************************
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void
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timerA0_init(void)
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{
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//
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// Enable the LFRC.
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//
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am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_LFRC_START, 0);
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//
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// Set up timer A0.
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//
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am_hal_ctimer_clear(0, AM_HAL_CTIMER_TIMERA);
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am_hal_ctimer_config(0, &g_sTimer0);
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//
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// Set the timing for timerA0.
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//
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am_hal_ctimer_period_set(0, AM_HAL_CTIMER_TIMERA, 31, 0);
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//
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// Clear the timer Interrupt
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//
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am_hal_ctimer_int_clear(AM_HAL_CTIMER_INT_TIMERA0);
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}
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//*****************************************************************************
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//
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// Timer Interrupt Service Routine (ISR)
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//
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//*****************************************************************************
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void
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am_ctimer_isr(void)
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{
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//
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// Clear TimerA0 Interrupt (write to clear).
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//
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am_hal_ctimer_int_clear(AM_HAL_CTIMER_INT_TIMERA0);
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am_hal_rtc_time_get(&hal_time);
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}
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//*****************************************************************************
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//
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// Support function:
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// toVal() converts a string to an ASCII value.
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//
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//*****************************************************************************
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int
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toVal(char *pcAsciiStr)
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{
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int iRetVal = 0;
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iRetVal += pcAsciiStr[1] - '0';
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iRetVal += pcAsciiStr[0] == ' ' ? 0 : (pcAsciiStr[0] - '0') * 10;
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return iRetVal;
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}
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//*****************************************************************************
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//
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// Support function:
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// mthToIndex() converts a string indicating a month to an index value.
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// The return value is a value 0-12, with 0-11 indicating the month given
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// by the string, and 12 indicating that the string is not a month.
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//
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//*****************************************************************************
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int
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mthToIndex(char *pcMon)
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{
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int idx;
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for (idx = 0; idx < 12; idx++)
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{
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if ( am_util_string_strnicmp(pcMonth[idx], pcMon, 3) == 0 )
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{
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return idx;
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}
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}
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return 12;
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}
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//*****************************************************************************
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//
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// Main
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//
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//*****************************************************************************
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int
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main(void)
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{
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//
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// Set the clock frequency.
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//
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am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_SYSCLK_MAX, 0);
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//
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// Set the default cache configuration
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//
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am_hal_cachectrl_config(&am_hal_cachectrl_defaults);
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am_hal_cachectrl_enable();
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//
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// Configure the board for low power operation.
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//
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am_bsp_low_power_init();
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//
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// Enable the XT for the RTC.
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//
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am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_XTAL_START, 0);
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//
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// Select XT for RTC clock source
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//
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am_hal_rtc_osc_select(AM_HAL_RTC_OSC_XT);
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//
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// Enable the RTC.
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//
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am_hal_rtc_osc_enable();
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//
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// Initialize the printf interface for ITM/SWO output.
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//
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am_bsp_itm_printf_enable();
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//
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// Enable the ITM.
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//
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am_hal_itm_enable();
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//
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// Set the RTC time for this example.
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// WARNING this will destroy any time epoch currently in the RTC.
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//
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#if defined(__GNUC__) || defined(__ARMCC_VERSION) || defined(__IAR_SYSTEMS_ICC__)
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//
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// The RTC is initialized from the date and time strings that are
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// obtained from the compiler at compile time.
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//
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hal_time.ui32Hour = toVal(&__TIME__[0]);
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hal_time.ui32Minute = toVal(&__TIME__[3]);
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hal_time.ui32Second = toVal(&__TIME__[6]);
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hal_time.ui32Hundredths = 00;
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hal_time.ui32Weekday = am_util_time_computeDayofWeek(2000 + toVal(&__DATE__[9]), mthToIndex(&__DATE__[0]) + 1, toVal(&__DATE__[4]) );
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hal_time.ui32DayOfMonth = toVal(&__DATE__[4]);
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hal_time.ui32Month = mthToIndex(&__DATE__[0]);
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hal_time.ui32Year = toVal(&__DATE__[9]);
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hal_time.ui32Century = 0;
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#else
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//
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// The RTC is initialized from an arbitrary date.
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//
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hal_time.ui32Hour = 14;
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hal_time.ui32Minute = 24;
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hal_time.ui32Second = 33;
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hal_time.ui32Hundredths = 50;
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hal_time.ui32Weekday = 3;
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hal_time.ui32DayOfMonth = 15;
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hal_time.ui32Month = 4;
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hal_time.ui32Year = 14;
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hal_time.ui32Century = 0;
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#endif
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am_hal_rtc_time_set(&hal_time);
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//
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// TimerA0 init.
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//
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timerA0_init();
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//
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// Enable the timer Interrupt.
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//
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am_hal_ctimer_int_enable(AM_HAL_CTIMER_INT_TIMERA0);
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//
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// Enable the timer interrupt in the NVIC.
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//
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NVIC_EnableIRQ(CTIMER_IRQn);
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am_hal_interrupt_master_enable();
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//
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// Enable the timer.
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//
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am_hal_ctimer_start(0, AM_HAL_CTIMER_TIMERA);
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//
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// Loop forever, printing when awakened by the timer.
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//
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while (1)
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{
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//
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// Enable debug printf messages using ITM on SWO pin
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//
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am_bsp_debug_printf_enable();
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//
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// Clear the terminal.
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//
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am_util_stdio_terminal_clear();
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//
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// Print the banner.
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//
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am_util_stdio_printf("RTC Print Example\n");
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am_util_stdio_printf("This example was built on %s at %s.\n\n", __DATE__, __TIME__);
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//
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// Print RTC time.
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//
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am_hal_rtc_time_get(&hal_time);
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am_util_stdio_printf("\tIt is now ");
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am_util_stdio_printf("%d : ", hal_time.ui32Hour);
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am_util_stdio_printf("%02d : ", hal_time.ui32Minute);
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am_util_stdio_printf("%02d.", hal_time.ui32Second);
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am_util_stdio_printf("%02d ", hal_time.ui32Hundredths);
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am_util_stdio_printf(pcWeekday[hal_time.ui32Weekday]);
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am_util_stdio_printf(" ");
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am_util_stdio_printf(pcMonth[hal_time.ui32Month]);
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am_util_stdio_printf(" ");
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am_util_stdio_printf("%d, ", hal_time.ui32DayOfMonth);
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am_util_stdio_printf("20%02d", hal_time.ui32Year);
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//
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// We are done printing. Disable debug printf messages on ITM.
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//
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am_bsp_debug_printf_disable();
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//
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// Go to Deep Sleep and wait for a wake up.
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//
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am_hal_sysctrl_sleep(AM_HAL_SYSCTRL_SLEEP_DEEP);
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}
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}
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