en 129 / mbed-src

[11U68]fix P0_11 to use GPIO

Fork of mbed-src by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/rtc_api.c@548:1abac31e188e, 2015-05-22 (annotated)

Committer:
mbed_official
Date:
Fri May 22 10:45:46 2015 +0100
Revision:
548:1abac31e188e
Parent:
526:7c4bdfe6a168
Child:
550:787824fdf8f9
Synchronized with git revision 88d158e43b54f97c5e94da305ea9a096889cc81b



Full URL: https://github.com/mbedmicro/mbed/commit/88d158e43b54f97c5e94da305ea9a096889cc81b/



Silicon Labs - Cosmetic: apply mbed coding style to HAL

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 525:c320967f86b9 1 /* mbed Microcontroller Library
mbed_official 525:c320967f86b9 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 525:c320967f86b9 3 *
mbed_official 525:c320967f86b9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 525:c320967f86b9 5 * you may not use this file except in compliance with the License.
mbed_official 525:c320967f86b9 6 * You may obtain a copy of the License at
mbed_official 525:c320967f86b9 7 *
mbed_official 525:c320967f86b9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 525:c320967f86b9 9 *
mbed_official 525:c320967f86b9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 525:c320967f86b9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 525:c320967f86b9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 525:c320967f86b9 13 * See the License for the specific language governing permissions and
mbed_official 525:c320967f86b9 14 * limitations under the License.
mbed_official 525:c320967f86b9 15 */
mbed_official 525:c320967f86b9 16
mbed_official 525:c320967f86b9 17 #include "device.h"
mbed_official 525:c320967f86b9 18 #if DEVICE_RTC
mbed_official 525:c320967f86b9 19
mbed_official 525:c320967f86b9 20 #include "rtc_api.h"
mbed_official 525:c320967f86b9 21 #include "rtc_api_HAL.h"
mbed_official 525:c320967f86b9 22 #include "em_cmu.h"
mbed_official 525:c320967f86b9 23 #include "em_rtc.h"
mbed_official 525:c320967f86b9 24 #include "sleep_api.h"
mbed_official 526:7c4bdfe6a168 25 #include "sleepmodes.h"
mbed_official 525:c320967f86b9 26
mbed_official 525:c320967f86b9 27 static bool rtc_inited = false;
mbed_official 525:c320967f86b9 28 static time_t time_base = 0;
mbed_official 525:c320967f86b9 29 static uint32_t useflags = 0;
mbed_official 525:c320967f86b9 30
mbed_official 548:1abac31e188e 31 static void (*comp0_handler)(void) = NULL;
mbed_official 525:c320967f86b9 32
mbed_official 525:c320967f86b9 33 #define RTC_LEAST_ACTIVE_SLEEPMODE EM2
mbed_official 525:c320967f86b9 34
mbed_official 525:c320967f86b9 35
mbed_official 525:c320967f86b9 36 void RTC_IRQHandler(void)
mbed_official 525:c320967f86b9 37 {
mbed_official 525:c320967f86b9 38 uint32_t flags;
mbed_official 525:c320967f86b9 39 flags = RTC_IntGet();
mbed_official 548:1abac31e188e 40 if (flags & RTC_IF_OF) {
mbed_official 525:c320967f86b9 41 RTC_IntClear(RTC_IF_OF);
mbed_official 525:c320967f86b9 42 /* RTC has overflowed (24 bits). Use time_base as software counter for upper 8 bits. */
mbed_official 525:c320967f86b9 43 time_base += 1 << 24;
mbed_official 525:c320967f86b9 44 }
mbed_official 548:1abac31e188e 45 if (flags & RTC_IF_COMP0) {
mbed_official 525:c320967f86b9 46 RTC_IntClear(RTC_IF_COMP0);
mbed_official 548:1abac31e188e 47 if (comp0_handler != NULL) {
mbed_official 525:c320967f86b9 48 comp0_handler();
mbed_official 525:c320967f86b9 49 }
mbed_official 525:c320967f86b9 50 }
mbed_official 525:c320967f86b9 51 }
mbed_official 525:c320967f86b9 52
mbed_official 525:c320967f86b9 53 void rtc_set_comp0_handler(uint32_t handler)
mbed_official 525:c320967f86b9 54 {
mbed_official 525:c320967f86b9 55 comp0_handler = (void (*)(void)) handler;
mbed_official 525:c320967f86b9 56 }
mbed_official 525:c320967f86b9 57
mbed_official 548:1abac31e188e 58 void rtc_init(void)
mbed_official 525:c320967f86b9 59 {
mbed_official 525:c320967f86b9 60 /* Register that the RTC is used for timekeeping. */
mbed_official 525:c320967f86b9 61 rtc_init_real(RTC_INIT_RTC);
mbed_official 525:c320967f86b9 62 }
mbed_official 525:c320967f86b9 63
mbed_official 525:c320967f86b9 64
mbed_official 525:c320967f86b9 65 void rtc_init_real(uint32_t flags)
mbed_official 525:c320967f86b9 66 {
mbed_official 525:c320967f86b9 67 useflags |= flags;
mbed_official 525:c320967f86b9 68
mbed_official 548:1abac31e188e 69 if (!rtc_inited) {
mbed_official 525:c320967f86b9 70 /* Start LFXO and wait until it is stable */
mbed_official 525:c320967f86b9 71 CMU_OscillatorEnable(cmuOsc_LFXO, true, true);
mbed_official 525:c320967f86b9 72
mbed_official 525:c320967f86b9 73 /* Route the LFXO clock to the RTC */
mbed_official 525:c320967f86b9 74 CMU_ClockSelectSet(cmuClock_LFA, LOW_ENERGY_CLOCK_SOURCE);
mbed_official 525:c320967f86b9 75 CMU_ClockEnable(cmuClock_RTC, true);
mbed_official 525:c320967f86b9 76
mbed_official 525:c320967f86b9 77 /* Enable clock to the interface of the low energy modules */
mbed_official 525:c320967f86b9 78 CMU_ClockEnable(cmuClock_CORELE, true);
mbed_official 525:c320967f86b9 79
mbed_official 525:c320967f86b9 80 /* Scale clock to save power */
mbed_official 525:c320967f86b9 81 CMU_ClockDivSet(cmuClock_RTC, RTC_CLOCKDIV);
mbed_official 525:c320967f86b9 82
mbed_official 525:c320967f86b9 83 /* Initialize RTC */
mbed_official 525:c320967f86b9 84 RTC_Init_TypeDef init = RTC_INIT_DEFAULT;
mbed_official 525:c320967f86b9 85 init.enable = 1;
mbed_official 525:c320967f86b9 86 /* Don't use compare register 0 as top value */
mbed_official 525:c320967f86b9 87 init.comp0Top = 0;
mbed_official 525:c320967f86b9 88
mbed_official 525:c320967f86b9 89 /* Enable Interrupt from RTC */
mbed_official 525:c320967f86b9 90 RTC_IntEnable(RTC_IEN_OF);
mbed_official 525:c320967f86b9 91 NVIC_EnableIRQ(RTC_IRQn);
mbed_official 525:c320967f86b9 92 NVIC_SetVector(RTC_IRQn, (uint32_t)RTC_IRQHandler);
mbed_official 525:c320967f86b9 93
mbed_official 525:c320967f86b9 94 /* Initialize */
mbed_official 525:c320967f86b9 95 RTC_Init(&init);
mbed_official 525:c320967f86b9 96
mbed_official 525:c320967f86b9 97 blockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE);
mbed_official 525:c320967f86b9 98 rtc_inited = true;
mbed_official 525:c320967f86b9 99 }
mbed_official 525:c320967f86b9 100 }
mbed_official 525:c320967f86b9 101
mbed_official 548:1abac31e188e 102 void rtc_free(void)
mbed_official 525:c320967f86b9 103 {
mbed_official 525:c320967f86b9 104 rtc_free_real(RTC_INIT_RTC);
mbed_official 525:c320967f86b9 105 }
mbed_official 525:c320967f86b9 106
mbed_official 525:c320967f86b9 107 void rtc_free_real(uint32_t flags)
mbed_official 525:c320967f86b9 108 {
mbed_official 525:c320967f86b9 109 /* Clear use flag */
mbed_official 548:1abac31e188e 110 flags &= ~flags;
mbed_official 525:c320967f86b9 111
mbed_official 525:c320967f86b9 112 /* Disable the RTC if it was inited and is no longer in use by anyone. */
mbed_official 548:1abac31e188e 113 if (rtc_inited && (flags == 0)) {
mbed_official 525:c320967f86b9 114 NVIC_DisableIRQ(RTC_IRQn);
mbed_official 525:c320967f86b9 115 RTC_Reset();
mbed_official 525:c320967f86b9 116 CMU_ClockEnable(cmuClock_RTC, false);
mbed_official 525:c320967f86b9 117 unblockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE);
mbed_official 525:c320967f86b9 118 rtc_inited = false;
mbed_official 525:c320967f86b9 119 }
mbed_official 525:c320967f86b9 120 }
mbed_official 525:c320967f86b9 121
mbed_official 525:c320967f86b9 122 int rtc_isenabled(void)
mbed_official 525:c320967f86b9 123 {
mbed_official 525:c320967f86b9 124 return rtc_inited;
mbed_official 525:c320967f86b9 125 }
mbed_official 525:c320967f86b9 126
mbed_official 525:c320967f86b9 127 time_t rtc_read(void)
mbed_official 525:c320967f86b9 128 {
mbed_official 525:c320967f86b9 129 return (time_t) ((RTC_CounterGet() + time_base) >> RTC_FREQ_SHIFT);
mbed_official 525:c320967f86b9 130 }
mbed_official 525:c320967f86b9 131
mbed_official 525:c320967f86b9 132 void rtc_write(time_t t)
mbed_official 525:c320967f86b9 133 {
mbed_official 525:c320967f86b9 134 /* We have to check that the RTC did not tick while doing this. */
mbed_official 525:c320967f86b9 135 /* If the RTC ticks we just redo this. */
mbed_official 525:c320967f86b9 136 uint32_t rtc_count;
mbed_official 525:c320967f86b9 137 do {
mbed_official 525:c320967f86b9 138 rtc_count = RTC_CounterGet();
mbed_official 525:c320967f86b9 139 time_base = (t << RTC_FREQ_SHIFT) - rtc_count;
mbed_official 525:c320967f86b9 140 } while (rtc_count != RTC_CounterGet());
mbed_official 525:c320967f86b9 141 }
mbed_official 525:c320967f86b9 142
mbed_official 525:c320967f86b9 143 #endif