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Fork of mbed-dev by
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/rtc_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 50:a417edff4437
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /***************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 2 | * @file rtc_api.c |
bogdanm | 0:9b334a45a8ff | 3 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 4 | * @section License |
bogdanm | 0:9b334a45a8ff | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
bogdanm | 0:9b334a45a8ff | 6 | ******************************************************************************* |
bogdanm | 0:9b334a45a8ff | 7 | * |
bogdanm | 0:9b334a45a8ff | 8 | * Permission is granted to anyone to use this software for any purpose, |
bogdanm | 0:9b334a45a8ff | 9 | * including commercial applications, and to alter it and redistribute it |
bogdanm | 0:9b334a45a8ff | 10 | * freely, subject to the following restrictions: |
bogdanm | 0:9b334a45a8ff | 11 | * |
bogdanm | 0:9b334a45a8ff | 12 | * 1. The origin of this software must not be misrepresented; you must not |
bogdanm | 0:9b334a45a8ff | 13 | * claim that you wrote the original software. |
bogdanm | 0:9b334a45a8ff | 14 | * 2. Altered source versions must be plainly marked as such, and must not be |
bogdanm | 0:9b334a45a8ff | 15 | * misrepresented as being the original software. |
bogdanm | 0:9b334a45a8ff | 16 | * 3. This notice may not be removed or altered from any source distribution. |
bogdanm | 0:9b334a45a8ff | 17 | * |
bogdanm | 0:9b334a45a8ff | 18 | * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no |
bogdanm | 0:9b334a45a8ff | 19 | * obligation to support this Software. Silicon Labs is providing the |
bogdanm | 0:9b334a45a8ff | 20 | * Software "AS IS", with no express or implied warranties of any kind, |
bogdanm | 0:9b334a45a8ff | 21 | * including, but not limited to, any implied warranties of merchantability |
bogdanm | 0:9b334a45a8ff | 22 | * or fitness for any particular purpose or warranties against infringement |
bogdanm | 0:9b334a45a8ff | 23 | * of any proprietary rights of a third party. |
bogdanm | 0:9b334a45a8ff | 24 | * |
bogdanm | 0:9b334a45a8ff | 25 | * Silicon Labs will not be liable for any consequential, incidental, or |
bogdanm | 0:9b334a45a8ff | 26 | * special damages, or any other relief, or for any claim by any third party, |
bogdanm | 0:9b334a45a8ff | 27 | * arising from your use of this Software. |
bogdanm | 0:9b334a45a8ff | 28 | * |
bogdanm | 0:9b334a45a8ff | 29 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 30 | |
bogdanm | 0:9b334a45a8ff | 31 | #include "device.h" |
bogdanm | 0:9b334a45a8ff | 32 | #if DEVICE_RTC |
bogdanm | 0:9b334a45a8ff | 33 | |
bogdanm | 0:9b334a45a8ff | 34 | #include "rtc_api.h" |
bogdanm | 0:9b334a45a8ff | 35 | #include "rtc_api_HAL.h" |
bogdanm | 0:9b334a45a8ff | 36 | #include "em_cmu.h" |
bogdanm | 0:9b334a45a8ff | 37 | #include "em_rtc.h" |
bogdanm | 0:9b334a45a8ff | 38 | #include "sleep_api.h" |
bogdanm | 0:9b334a45a8ff | 39 | #include "sleepmodes.h" |
bogdanm | 0:9b334a45a8ff | 40 | |
bogdanm | 0:9b334a45a8ff | 41 | static bool rtc_inited = false; |
bogdanm | 0:9b334a45a8ff | 42 | static time_t time_base = 0; |
bogdanm | 0:9b334a45a8ff | 43 | static uint32_t useflags = 0; |
bogdanm | 0:9b334a45a8ff | 44 | static uint32_t time_extend = 0; |
bogdanm | 0:9b334a45a8ff | 45 | |
bogdanm | 0:9b334a45a8ff | 46 | static void (*comp0_handler)(void) = NULL; |
bogdanm | 0:9b334a45a8ff | 47 | |
bogdanm | 0:9b334a45a8ff | 48 | #define RTC_LEAST_ACTIVE_SLEEPMODE EM2 |
bogdanm | 0:9b334a45a8ff | 49 | #define RTC_NUM_BITS (24) |
bogdanm | 0:9b334a45a8ff | 50 | |
bogdanm | 0:9b334a45a8ff | 51 | void RTC_IRQHandler(void) |
bogdanm | 0:9b334a45a8ff | 52 | { |
bogdanm | 0:9b334a45a8ff | 53 | uint32_t flags; |
bogdanm | 0:9b334a45a8ff | 54 | flags = RTC_IntGet(); |
bogdanm | 0:9b334a45a8ff | 55 | if (flags & RTC_IF_OF) { |
bogdanm | 0:9b334a45a8ff | 56 | RTC_IntClear(RTC_IF_OF); |
bogdanm | 0:9b334a45a8ff | 57 | /* RTC has overflowed (24 bits). Use time_extend as software counter for 32 more bits. */ |
bogdanm | 0:9b334a45a8ff | 58 | time_extend += 1; |
bogdanm | 0:9b334a45a8ff | 59 | } |
bogdanm | 0:9b334a45a8ff | 60 | if (flags & RTC_IF_COMP0) { |
bogdanm | 0:9b334a45a8ff | 61 | RTC_IntClear(RTC_IF_COMP0); |
bogdanm | 0:9b334a45a8ff | 62 | if (comp0_handler != NULL) { |
bogdanm | 0:9b334a45a8ff | 63 | comp0_handler(); |
bogdanm | 0:9b334a45a8ff | 64 | } |
bogdanm | 0:9b334a45a8ff | 65 | } |
bogdanm | 0:9b334a45a8ff | 66 | } |
bogdanm | 0:9b334a45a8ff | 67 | |
bogdanm | 0:9b334a45a8ff | 68 | uint32_t rtc_get_32bit(void) |
bogdanm | 0:9b334a45a8ff | 69 | { |
bogdanm | 0:9b334a45a8ff | 70 | return (RTC_CounterGet() + (time_extend << RTC_NUM_BITS)); |
bogdanm | 0:9b334a45a8ff | 71 | } |
bogdanm | 0:9b334a45a8ff | 72 | |
bogdanm | 0:9b334a45a8ff | 73 | uint64_t rtc_get_full(void) |
bogdanm | 0:9b334a45a8ff | 74 | { |
bogdanm | 0:9b334a45a8ff | 75 | uint64_t ticks = 0; |
bogdanm | 0:9b334a45a8ff | 76 | ticks += time_extend; |
bogdanm | 0:9b334a45a8ff | 77 | ticks = ticks << RTC_NUM_BITS; |
bogdanm | 0:9b334a45a8ff | 78 | ticks += RTC_CounterGet(); |
bogdanm | 0:9b334a45a8ff | 79 | return ticks; |
bogdanm | 0:9b334a45a8ff | 80 | } |
bogdanm | 0:9b334a45a8ff | 81 | |
bogdanm | 0:9b334a45a8ff | 82 | void rtc_set_comp0_handler(uint32_t handler) |
bogdanm | 0:9b334a45a8ff | 83 | { |
bogdanm | 0:9b334a45a8ff | 84 | comp0_handler = (void (*)(void)) handler; |
bogdanm | 0:9b334a45a8ff | 85 | } |
bogdanm | 0:9b334a45a8ff | 86 | |
bogdanm | 0:9b334a45a8ff | 87 | void rtc_init(void) |
bogdanm | 0:9b334a45a8ff | 88 | { |
bogdanm | 0:9b334a45a8ff | 89 | /* Register that the RTC is used for timekeeping. */ |
bogdanm | 0:9b334a45a8ff | 90 | rtc_init_real(RTC_INIT_RTC); |
bogdanm | 0:9b334a45a8ff | 91 | } |
bogdanm | 0:9b334a45a8ff | 92 | |
bogdanm | 0:9b334a45a8ff | 93 | |
bogdanm | 0:9b334a45a8ff | 94 | void rtc_init_real(uint32_t flags) |
bogdanm | 0:9b334a45a8ff | 95 | { |
bogdanm | 0:9b334a45a8ff | 96 | useflags |= flags; |
bogdanm | 0:9b334a45a8ff | 97 | |
bogdanm | 0:9b334a45a8ff | 98 | if (!rtc_inited) { |
bogdanm | 0:9b334a45a8ff | 99 | CMU_ClockEnable(cmuClock_RTC, true); |
bogdanm | 0:9b334a45a8ff | 100 | |
bogdanm | 0:9b334a45a8ff | 101 | /* Enable clock to the interface of the low energy modules */ |
bogdanm | 0:9b334a45a8ff | 102 | CMU_ClockEnable(cmuClock_CORELE, true); |
bogdanm | 0:9b334a45a8ff | 103 | |
bogdanm | 0:9b334a45a8ff | 104 | /* Scale clock to save power */ |
bogdanm | 0:9b334a45a8ff | 105 | CMU_ClockDivSet(cmuClock_RTC, RTC_CLOCKDIV); |
bogdanm | 0:9b334a45a8ff | 106 | |
bogdanm | 0:9b334a45a8ff | 107 | /* Initialize RTC */ |
bogdanm | 0:9b334a45a8ff | 108 | RTC_Init_TypeDef init = RTC_INIT_DEFAULT; |
bogdanm | 0:9b334a45a8ff | 109 | init.enable = 1; |
bogdanm | 0:9b334a45a8ff | 110 | /* Don't use compare register 0 as top value */ |
bogdanm | 0:9b334a45a8ff | 111 | init.comp0Top = 0; |
bogdanm | 0:9b334a45a8ff | 112 | |
bogdanm | 0:9b334a45a8ff | 113 | /* Enable Interrupt from RTC */ |
bogdanm | 0:9b334a45a8ff | 114 | RTC_IntEnable(RTC_IEN_OF); |
bogdanm | 0:9b334a45a8ff | 115 | NVIC_EnableIRQ(RTC_IRQn); |
bogdanm | 0:9b334a45a8ff | 116 | NVIC_SetVector(RTC_IRQn, (uint32_t)RTC_IRQHandler); |
bogdanm | 0:9b334a45a8ff | 117 | |
bogdanm | 0:9b334a45a8ff | 118 | /* Initialize */ |
bogdanm | 0:9b334a45a8ff | 119 | RTC_Init(&init); |
bogdanm | 0:9b334a45a8ff | 120 | |
bogdanm | 0:9b334a45a8ff | 121 | blockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE); |
bogdanm | 0:9b334a45a8ff | 122 | rtc_inited = true; |
bogdanm | 0:9b334a45a8ff | 123 | } |
bogdanm | 0:9b334a45a8ff | 124 | } |
bogdanm | 0:9b334a45a8ff | 125 | |
bogdanm | 0:9b334a45a8ff | 126 | void rtc_free(void) |
bogdanm | 0:9b334a45a8ff | 127 | { |
bogdanm | 0:9b334a45a8ff | 128 | rtc_free_real(RTC_INIT_RTC); |
bogdanm | 0:9b334a45a8ff | 129 | } |
bogdanm | 0:9b334a45a8ff | 130 | |
bogdanm | 0:9b334a45a8ff | 131 | void rtc_free_real(uint32_t flags) |
bogdanm | 0:9b334a45a8ff | 132 | { |
bogdanm | 0:9b334a45a8ff | 133 | /* Clear use flag */ |
bogdanm | 0:9b334a45a8ff | 134 | useflags &= ~flags; |
bogdanm | 0:9b334a45a8ff | 135 | |
bogdanm | 0:9b334a45a8ff | 136 | /* Disable the RTC if it was inited and is no longer in use by anyone. */ |
bogdanm | 0:9b334a45a8ff | 137 | if (rtc_inited && (useflags == 0)) { |
bogdanm | 0:9b334a45a8ff | 138 | NVIC_DisableIRQ(RTC_IRQn); |
bogdanm | 0:9b334a45a8ff | 139 | RTC_Reset(); |
bogdanm | 0:9b334a45a8ff | 140 | CMU_ClockEnable(cmuClock_RTC, false); |
bogdanm | 0:9b334a45a8ff | 141 | unblockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE); |
bogdanm | 0:9b334a45a8ff | 142 | rtc_inited = false; |
bogdanm | 0:9b334a45a8ff | 143 | } |
bogdanm | 0:9b334a45a8ff | 144 | } |
bogdanm | 0:9b334a45a8ff | 145 | |
bogdanm | 0:9b334a45a8ff | 146 | int rtc_isenabled(void) |
bogdanm | 0:9b334a45a8ff | 147 | { |
bogdanm | 0:9b334a45a8ff | 148 | return rtc_inited; |
bogdanm | 0:9b334a45a8ff | 149 | } |
bogdanm | 0:9b334a45a8ff | 150 | |
bogdanm | 0:9b334a45a8ff | 151 | time_t rtc_read(void) |
bogdanm | 0:9b334a45a8ff | 152 | { |
bogdanm | 0:9b334a45a8ff | 153 | return (time_t) (rtc_get_full() >> RTC_FREQ_SHIFT) + time_base; |
bogdanm | 0:9b334a45a8ff | 154 | } |
bogdanm | 0:9b334a45a8ff | 155 | |
bogdanm | 0:9b334a45a8ff | 156 | time_t rtc_read_uncompensated(void) |
bogdanm | 0:9b334a45a8ff | 157 | { |
bogdanm | 0:9b334a45a8ff | 158 | return (time_t) (rtc_get_full() >> RTC_FREQ_SHIFT); |
bogdanm | 0:9b334a45a8ff | 159 | } |
bogdanm | 0:9b334a45a8ff | 160 | |
bogdanm | 0:9b334a45a8ff | 161 | void rtc_write(time_t t) |
bogdanm | 0:9b334a45a8ff | 162 | { |
bogdanm | 0:9b334a45a8ff | 163 | /* We have to check that the RTC did not tick while doing this. */ |
bogdanm | 0:9b334a45a8ff | 164 | /* If the RTC ticks we just redo this. */ |
bogdanm | 0:9b334a45a8ff | 165 | uint32_t time; |
bogdanm | 0:9b334a45a8ff | 166 | do { |
bogdanm | 0:9b334a45a8ff | 167 | time = rtc_read_uncompensated(); |
bogdanm | 0:9b334a45a8ff | 168 | time_base = t - time; |
bogdanm | 0:9b334a45a8ff | 169 | } while (time != rtc_read_uncompensated()); |
bogdanm | 0:9b334a45a8ff | 170 | } |
bogdanm | 0:9b334a45a8ff | 171 | |
bogdanm | 0:9b334a45a8ff | 172 | #endif |