Genadi Zawidowski / mbed-dev

mbed library sources. Supersedes mbed-src. Edited target satm32f446 for user USART3 pins

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Fork of mbed-dev by mbed official

targets/TARGET_Silicon_Labs/TARGET_EFM32/rtcc.c@186:707f6e361f3e, 2018-06-22 (annotated)

Committer:
Anna Bridge
Date:
Fri Jun 22 16:45:37 2018 +0100
Revision:
186:707f6e361f3e
mbed-dev library. Release version 162

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Anna Bridge 186:707f6e361f3e 1 /***************************************************************************//**
Anna Bridge 186:707f6e361f3e 2 * @file rtc_rtcc.c
Anna Bridge 186:707f6e361f3e 3 *******************************************************************************
Anna Bridge 186:707f6e361f3e 4 * @section License
Anna Bridge 186:707f6e361f3e 5 * <b>(C) Copyright 2018 Silicon Labs, http://www.silabs.com</b>
Anna Bridge 186:707f6e361f3e 6 *******************************************************************************
Anna Bridge 186:707f6e361f3e 7 *
Anna Bridge 186:707f6e361f3e 8 * SPDX-License-Identifier: Apache-2.0
Anna Bridge 186:707f6e361f3e 9 *
Anna Bridge 186:707f6e361f3e 10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
Anna Bridge 186:707f6e361f3e 11 * not use this file except in compliance with the License.
Anna Bridge 186:707f6e361f3e 12 * You may obtain a copy of the License at
Anna Bridge 186:707f6e361f3e 13 *
Anna Bridge 186:707f6e361f3e 14 * http://www.apache.org/licenses/LICENSE-2.0
Anna Bridge 186:707f6e361f3e 15 *
Anna Bridge 186:707f6e361f3e 16 * Unless required by applicable law or agreed to in writing, software
Anna Bridge 186:707f6e361f3e 17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
Anna Bridge 186:707f6e361f3e 18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Anna Bridge 186:707f6e361f3e 19 * See the License for the specific language governing permissions and
Anna Bridge 186:707f6e361f3e 20 * limitations under the License.
Anna Bridge 186:707f6e361f3e 21 *
Anna Bridge 186:707f6e361f3e 22 ******************************************************************************/
Anna Bridge 186:707f6e361f3e 23
Anna Bridge 186:707f6e361f3e 24 #include "device.h"
Anna Bridge 186:707f6e361f3e 25 #if DEVICE_RTC || DEVICE_LPTICKER
Anna Bridge 186:707f6e361f3e 26
Anna Bridge 186:707f6e361f3e 27 /* Use RTCC on devices that have it */
Anna Bridge 186:707f6e361f3e 28 #if defined(RTCC_PRESENT)
Anna Bridge 186:707f6e361f3e 29
Anna Bridge 186:707f6e361f3e 30 #include "em_cmu.h"
Anna Bridge 186:707f6e361f3e 31 #include "em_rmu.h"
Anna Bridge 186:707f6e361f3e 32 #include "em_rtcc.h"
Anna Bridge 186:707f6e361f3e 33 #include "rtc_api.h"
Anna Bridge 186:707f6e361f3e 34 #include "lp_ticker_api.h"
Anna Bridge 186:707f6e361f3e 35 #include "clocking.h"
Anna Bridge 186:707f6e361f3e 36
Anna Bridge 186:707f6e361f3e 37 static bool lptick_inited = false;
Anna Bridge 186:707f6e361f3e 38 static uint32_t lptick_offset = 0;
Anna Bridge 186:707f6e361f3e 39
Anna Bridge 186:707f6e361f3e 40 void rtc_init(void)
Anna Bridge 186:707f6e361f3e 41 {
Anna Bridge 186:707f6e361f3e 42 if (BUS_RegBitRead((&RTCC->CTRL), _RTCC_CTRL_ENABLE_SHIFT) != 0) {
Anna Bridge 186:707f6e361f3e 43 /* RTCC already up & running */
Anna Bridge 186:707f6e361f3e 44 return;
Anna Bridge 186:707f6e361f3e 45 }
Anna Bridge 186:707f6e361f3e 46
Anna Bridge 186:707f6e361f3e 47 /* Make sure RTCC doesn't get reset (mbed specification) */
Anna Bridge 186:707f6e361f3e 48 RMU_ResetControl(rmuResetWdog, rmuResetModeLimited);
Anna Bridge 186:707f6e361f3e 49 RMU_ResetControl(rmuResetCoreLockup, rmuResetModeLimited);
Anna Bridge 186:707f6e361f3e 50 RMU_ResetControl(rmuResetSys, rmuResetModeLimited);
Anna Bridge 186:707f6e361f3e 51 RMU_ResetControl(rmuResetPin, rmuResetModeFull);
Anna Bridge 186:707f6e361f3e 52
Anna Bridge 186:707f6e361f3e 53 /* Set up the RTCC and let it run, Forrest, run */
Anna Bridge 186:707f6e361f3e 54 RTCC_Reset();
Anna Bridge 186:707f6e361f3e 55 RTCC_Init_TypeDef rtcc_init = RTCC_INIT_DEFAULT;
Anna Bridge 186:707f6e361f3e 56 rtcc_init.presc = rtccCntPresc_32768;
Anna Bridge 186:707f6e361f3e 57 RTCC_Init(&rtcc_init);
Anna Bridge 186:707f6e361f3e 58 RTCC_Enable(true);
Anna Bridge 186:707f6e361f3e 59 }
Anna Bridge 186:707f6e361f3e 60
Anna Bridge 186:707f6e361f3e 61 void rtc_free(void)
Anna Bridge 186:707f6e361f3e 62 {
Anna Bridge 186:707f6e361f3e 63 /* Can't turn off any clock gates here since other parts of the
Anna Bridge 186:707f6e361f3e 64 * system might be using the CORELE clock. */
Anna Bridge 186:707f6e361f3e 65 }
Anna Bridge 186:707f6e361f3e 66
Anna Bridge 186:707f6e361f3e 67 int rtc_isenabled(void)
Anna Bridge 186:707f6e361f3e 68 {
Anna Bridge 186:707f6e361f3e 69 return BUS_RegBitRead((&RTCC->CTRL), _RTCC_CTRL_ENABLE_SHIFT);
Anna Bridge 186:707f6e361f3e 70 }
Anna Bridge 186:707f6e361f3e 71
Anna Bridge 186:707f6e361f3e 72 time_t rtc_read(void)
Anna Bridge 186:707f6e361f3e 73 {
Anna Bridge 186:707f6e361f3e 74 return RTCC_CounterGet();
Anna Bridge 186:707f6e361f3e 75 }
Anna Bridge 186:707f6e361f3e 76
Anna Bridge 186:707f6e361f3e 77 void rtc_write(time_t t)
Anna Bridge 186:707f6e361f3e 78 {
Anna Bridge 186:707f6e361f3e 79 core_util_critical_section_enter();
Anna Bridge 186:707f6e361f3e 80 uint32_t diff = t - RTCC_CounterGet();
Anna Bridge 186:707f6e361f3e 81 lptick_offset += diff;
Anna Bridge 186:707f6e361f3e 82
Anna Bridge 186:707f6e361f3e 83 if(RTCC_IntGetEnabled() & RTCC_IF_CC0) {
Anna Bridge 186:707f6e361f3e 84 RTCC->CC[0].CCV += diff << 15;
Anna Bridge 186:707f6e361f3e 85 }
Anna Bridge 186:707f6e361f3e 86
Anna Bridge 186:707f6e361f3e 87 RTCC_CounterSet(t);
Anna Bridge 186:707f6e361f3e 88 core_util_critical_section_exit();
Anna Bridge 186:707f6e361f3e 89 }
Anna Bridge 186:707f6e361f3e 90
Anna Bridge 186:707f6e361f3e 91 /************************* LP_TICKER **************************/
Anna Bridge 186:707f6e361f3e 92 const ticker_info_t* lp_ticker_get_info(void)
Anna Bridge 186:707f6e361f3e 93 {
Anna Bridge 186:707f6e361f3e 94 static const ticker_info_t rtc_info = {
Anna Bridge 186:707f6e361f3e 95 LOW_ENERGY_CLOCK_FREQUENCY,
Anna Bridge 186:707f6e361f3e 96 32
Anna Bridge 186:707f6e361f3e 97 };
Anna Bridge 186:707f6e361f3e 98 return &rtc_info;
Anna Bridge 186:707f6e361f3e 99 }
Anna Bridge 186:707f6e361f3e 100
Anna Bridge 186:707f6e361f3e 101 void RTCC_IRQHandler(void)
Anna Bridge 186:707f6e361f3e 102 {
Anna Bridge 186:707f6e361f3e 103 uint32_t flags;
Anna Bridge 186:707f6e361f3e 104 flags = RTCC_IntGet();
Anna Bridge 186:707f6e361f3e 105 if (flags & RTCC_IF_CC0) {
Anna Bridge 186:707f6e361f3e 106 lp_ticker_irq_handler();
Anna Bridge 186:707f6e361f3e 107 }
Anna Bridge 186:707f6e361f3e 108 }
Anna Bridge 186:707f6e361f3e 109
Anna Bridge 186:707f6e361f3e 110 void lp_ticker_init()
Anna Bridge 186:707f6e361f3e 111 {
Anna Bridge 186:707f6e361f3e 112 if (!lptick_inited) {
Anna Bridge 186:707f6e361f3e 113 rtc_init();
Anna Bridge 186:707f6e361f3e 114 core_util_critical_section_enter();
Anna Bridge 186:707f6e361f3e 115 lptick_offset = RTCC_CounterGet();
Anna Bridge 186:707f6e361f3e 116 core_util_critical_section_exit();
Anna Bridge 186:707f6e361f3e 117 RTCC_CCChConf_TypeDef lp_chan_init = RTCC_CH_INIT_COMPARE_DEFAULT;
Anna Bridge 186:707f6e361f3e 118 lp_chan_init.compBase = rtccCompBasePreCnt;
Anna Bridge 186:707f6e361f3e 119 lp_chan_init.compMask = 0;
Anna Bridge 186:707f6e361f3e 120 RTCC_ChannelInit(0, &lp_chan_init);
Anna Bridge 186:707f6e361f3e 121 lptick_inited = true;
Anna Bridge 186:707f6e361f3e 122
Anna Bridge 186:707f6e361f3e 123 /* Enable Interrupt from RTCC in NVIC, but don't start generating them */
Anna Bridge 186:707f6e361f3e 124 RTCC_IntDisable(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 125 RTCC_IntClear(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 126 NVIC_EnableIRQ(RTCC_IRQn);
Anna Bridge 186:707f6e361f3e 127 } else {
Anna Bridge 186:707f6e361f3e 128 RTCC_IntDisable(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 129 RTCC_IntClear(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 130 }
Anna Bridge 186:707f6e361f3e 131 }
Anna Bridge 186:707f6e361f3e 132
Anna Bridge 186:707f6e361f3e 133 void lp_ticker_free()
Anna Bridge 186:707f6e361f3e 134 {
Anna Bridge 186:707f6e361f3e 135 if (lptick_inited) {
Anna Bridge 186:707f6e361f3e 136 lp_ticker_disable_interrupt();
Anna Bridge 186:707f6e361f3e 137 lp_ticker_clear_interrupt();
Anna Bridge 186:707f6e361f3e 138 lptick_inited = false;
Anna Bridge 186:707f6e361f3e 139 }
Anna Bridge 186:707f6e361f3e 140 }
Anna Bridge 186:707f6e361f3e 141
Anna Bridge 186:707f6e361f3e 142 void lp_ticker_set_interrupt(timestamp_t timestamp)
Anna Bridge 186:707f6e361f3e 143 {
Anna Bridge 186:707f6e361f3e 144 RTCC_ChannelCCVSet(0, timestamp + (lptick_offset << 15));
Anna Bridge 186:707f6e361f3e 145 RTCC_IntEnable(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 146 }
Anna Bridge 186:707f6e361f3e 147
Anna Bridge 186:707f6e361f3e 148 void lp_ticker_fire_interrupt(void)
Anna Bridge 186:707f6e361f3e 149 {
Anna Bridge 186:707f6e361f3e 150 RTCC_IntEnable(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 151 RTCC_IntSet(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 152 }
Anna Bridge 186:707f6e361f3e 153
Anna Bridge 186:707f6e361f3e 154 void lp_ticker_disable_interrupt()
Anna Bridge 186:707f6e361f3e 155 {
Anna Bridge 186:707f6e361f3e 156 RTCC_IntDisable(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 157 }
Anna Bridge 186:707f6e361f3e 158
Anna Bridge 186:707f6e361f3e 159 void lp_ticker_clear_interrupt()
Anna Bridge 186:707f6e361f3e 160 {
Anna Bridge 186:707f6e361f3e 161 RTCC_IntClear(RTCC_IF_CC0);
Anna Bridge 186:707f6e361f3e 162 }
Anna Bridge 186:707f6e361f3e 163
Anna Bridge 186:707f6e361f3e 164 timestamp_t lp_ticker_read()
Anna Bridge 186:707f6e361f3e 165 {
Anna Bridge 186:707f6e361f3e 166 core_util_critical_section_enter();
Anna Bridge 186:707f6e361f3e 167 uint32_t ticks = RTCC_CombinedCounterGet() - (lptick_offset << 15);
Anna Bridge 186:707f6e361f3e 168 core_util_critical_section_exit();
Anna Bridge 186:707f6e361f3e 169
Anna Bridge 186:707f6e361f3e 170 return (timestamp_t) (ticks);
Anna Bridge 186:707f6e361f3e 171 }
Anna Bridge 186:707f6e361f3e 172 #endif /* RTCC_PRESENT */
Anna Bridge 186:707f6e361f3e 173 #endif /* DEVICE_RTC */