added prescaler for 16 bit pwm in LPC1347 target
Fork of mbed-dev by
targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/rtc_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)
- Committer:
- JojoS
- Date:
- Sat Sep 10 15:32:04 2016 +0000
- Revision:
- 147:ba84b7dc41a7
- Parent:
- 144:ef7eb2e8f9f7
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /***************************************************************************//** |
<> | 144:ef7eb2e8f9f7 | 2 | * @file rtc_api.c |
<> | 144:ef7eb2e8f9f7 | 3 | ******************************************************************************* |
<> | 144:ef7eb2e8f9f7 | 4 | * @section License |
<> | 144:ef7eb2e8f9f7 | 5 | * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b> |
<> | 144:ef7eb2e8f9f7 | 6 | ******************************************************************************* |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * SPDX-License-Identifier: Apache-2.0 |
<> | 144:ef7eb2e8f9f7 | 9 | * |
<> | 144:ef7eb2e8f9f7 | 10 | * Licensed under the Apache License, Version 2.0 (the "License"); you may |
<> | 144:ef7eb2e8f9f7 | 11 | * not use this file except in compliance with the License. |
<> | 144:ef7eb2e8f9f7 | 12 | * You may obtain a copy of the License at |
<> | 144:ef7eb2e8f9f7 | 13 | * |
<> | 144:ef7eb2e8f9f7 | 14 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 144:ef7eb2e8f9f7 | 15 | * |
<> | 144:ef7eb2e8f9f7 | 16 | * Unless required by applicable law or agreed to in writing, software |
<> | 144:ef7eb2e8f9f7 | 17 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
<> | 144:ef7eb2e8f9f7 | 18 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 144:ef7eb2e8f9f7 | 19 | * See the License for the specific language governing permissions and |
<> | 144:ef7eb2e8f9f7 | 20 | * limitations under the License. |
<> | 144:ef7eb2e8f9f7 | 21 | * |
<> | 144:ef7eb2e8f9f7 | 22 | ******************************************************************************/ |
<> | 144:ef7eb2e8f9f7 | 23 | |
<> | 144:ef7eb2e8f9f7 | 24 | #include "device.h" |
<> | 144:ef7eb2e8f9f7 | 25 | #if DEVICE_RTC |
<> | 144:ef7eb2e8f9f7 | 26 | |
<> | 144:ef7eb2e8f9f7 | 27 | #include "rtc_api.h" |
<> | 144:ef7eb2e8f9f7 | 28 | #include "rtc_api_HAL.h" |
<> | 144:ef7eb2e8f9f7 | 29 | #include "em_cmu.h" |
<> | 144:ef7eb2e8f9f7 | 30 | #include "sleep_api.h" |
<> | 144:ef7eb2e8f9f7 | 31 | #include "sleepmodes.h" |
<> | 144:ef7eb2e8f9f7 | 32 | |
<> | 144:ef7eb2e8f9f7 | 33 | #if (defined RTC_COUNT) && (RTC_COUNT > 0) |
<> | 144:ef7eb2e8f9f7 | 34 | #include "em_rtc.h" |
<> | 144:ef7eb2e8f9f7 | 35 | #endif |
<> | 144:ef7eb2e8f9f7 | 36 | |
<> | 144:ef7eb2e8f9f7 | 37 | #if (defined RTCC_COUNT) && (RTCC_COUNT > 0) |
<> | 144:ef7eb2e8f9f7 | 38 | #include "em_rtcc.h" |
<> | 144:ef7eb2e8f9f7 | 39 | #endif |
<> | 144:ef7eb2e8f9f7 | 40 | |
<> | 144:ef7eb2e8f9f7 | 41 | static bool rtc_inited = false; |
<> | 144:ef7eb2e8f9f7 | 42 | static time_t time_base = 0; |
<> | 144:ef7eb2e8f9f7 | 43 | static uint32_t useflags = 0; |
<> | 144:ef7eb2e8f9f7 | 44 | static uint32_t time_extend = 0; |
<> | 144:ef7eb2e8f9f7 | 45 | |
<> | 144:ef7eb2e8f9f7 | 46 | static void (*comp0_handler)(void) = NULL; |
<> | 144:ef7eb2e8f9f7 | 47 | |
<> | 144:ef7eb2e8f9f7 | 48 | #ifndef RTCC_COUNT |
<> | 144:ef7eb2e8f9f7 | 49 | |
<> | 144:ef7eb2e8f9f7 | 50 | /* Using RTC API */ |
<> | 144:ef7eb2e8f9f7 | 51 | |
<> | 144:ef7eb2e8f9f7 | 52 | #define RTC_LEAST_ACTIVE_SLEEPMODE EM2 |
<> | 144:ef7eb2e8f9f7 | 53 | #define RTC_NUM_BITS (24) |
<> | 144:ef7eb2e8f9f7 | 54 | |
<> | 144:ef7eb2e8f9f7 | 55 | void RTC_IRQHandler(void) |
<> | 144:ef7eb2e8f9f7 | 56 | { |
<> | 144:ef7eb2e8f9f7 | 57 | uint32_t flags; |
<> | 144:ef7eb2e8f9f7 | 58 | flags = RTC_IntGet(); |
<> | 144:ef7eb2e8f9f7 | 59 | if (flags & RTC_IF_OF) { |
<> | 144:ef7eb2e8f9f7 | 60 | RTC_IntClear(RTC_IF_OF); |
<> | 144:ef7eb2e8f9f7 | 61 | /* RTC has overflowed (24 bits). Use time_extend as software counter for 32 more bits. */ |
<> | 144:ef7eb2e8f9f7 | 62 | time_extend += 1; |
<> | 144:ef7eb2e8f9f7 | 63 | } |
<> | 144:ef7eb2e8f9f7 | 64 | if (flags & RTC_IF_COMP0) { |
<> | 144:ef7eb2e8f9f7 | 65 | RTC_IntClear(RTC_IF_COMP0); |
<> | 144:ef7eb2e8f9f7 | 66 | if (comp0_handler != NULL) { |
<> | 144:ef7eb2e8f9f7 | 67 | comp0_handler(); |
<> | 144:ef7eb2e8f9f7 | 68 | } |
<> | 144:ef7eb2e8f9f7 | 69 | } |
<> | 144:ef7eb2e8f9f7 | 70 | } |
<> | 144:ef7eb2e8f9f7 | 71 | |
<> | 144:ef7eb2e8f9f7 | 72 | uint32_t rtc_get_32bit(void) |
<> | 144:ef7eb2e8f9f7 | 73 | { |
<> | 144:ef7eb2e8f9f7 | 74 | uint32_t pending = (RTC_IntGet() & RTC_IF_OF) ? 1 : 0; |
<> | 144:ef7eb2e8f9f7 | 75 | return (RTC_CounterGet() + ((time_extend + pending) << RTC_NUM_BITS)); |
<> | 144:ef7eb2e8f9f7 | 76 | } |
<> | 144:ef7eb2e8f9f7 | 77 | |
<> | 144:ef7eb2e8f9f7 | 78 | uint64_t rtc_get_full(void) |
<> | 144:ef7eb2e8f9f7 | 79 | { |
<> | 144:ef7eb2e8f9f7 | 80 | uint64_t ticks = 0; |
<> | 144:ef7eb2e8f9f7 | 81 | ticks += time_extend; |
<> | 144:ef7eb2e8f9f7 | 82 | ticks = ticks << RTC_NUM_BITS; |
<> | 144:ef7eb2e8f9f7 | 83 | ticks += RTC_CounterGet(); |
<> | 144:ef7eb2e8f9f7 | 84 | return ticks; |
<> | 144:ef7eb2e8f9f7 | 85 | } |
<> | 144:ef7eb2e8f9f7 | 86 | |
<> | 144:ef7eb2e8f9f7 | 87 | void rtc_init_real(uint32_t flags) |
<> | 144:ef7eb2e8f9f7 | 88 | { |
<> | 144:ef7eb2e8f9f7 | 89 | useflags |= flags; |
<> | 144:ef7eb2e8f9f7 | 90 | |
<> | 144:ef7eb2e8f9f7 | 91 | if (!rtc_inited) { |
<> | 144:ef7eb2e8f9f7 | 92 | CMU_ClockEnable(cmuClock_RTC, true); |
<> | 144:ef7eb2e8f9f7 | 93 | |
<> | 144:ef7eb2e8f9f7 | 94 | /* Enable clock to the interface of the low energy modules */ |
<> | 144:ef7eb2e8f9f7 | 95 | CMU_ClockEnable(cmuClock_CORELE, true); |
<> | 144:ef7eb2e8f9f7 | 96 | |
<> | 144:ef7eb2e8f9f7 | 97 | /* Scale clock to save power */ |
<> | 144:ef7eb2e8f9f7 | 98 | CMU_ClockDivSet(cmuClock_RTC, RTC_CLOCKDIV); |
<> | 144:ef7eb2e8f9f7 | 99 | |
<> | 144:ef7eb2e8f9f7 | 100 | /* Initialize RTC */ |
<> | 144:ef7eb2e8f9f7 | 101 | RTC_Init_TypeDef init = RTC_INIT_DEFAULT; |
<> | 144:ef7eb2e8f9f7 | 102 | init.enable = 1; |
<> | 144:ef7eb2e8f9f7 | 103 | /* Don't use compare register 0 as top value */ |
<> | 144:ef7eb2e8f9f7 | 104 | init.comp0Top = 0; |
<> | 144:ef7eb2e8f9f7 | 105 | |
<> | 144:ef7eb2e8f9f7 | 106 | /* Enable Interrupt from RTC */ |
<> | 144:ef7eb2e8f9f7 | 107 | RTC_IntEnable(RTC_IEN_OF); |
<> | 144:ef7eb2e8f9f7 | 108 | NVIC_SetVector(RTC_IRQn, (uint32_t)RTC_IRQHandler); |
<> | 144:ef7eb2e8f9f7 | 109 | NVIC_EnableIRQ(RTC_IRQn); |
<> | 144:ef7eb2e8f9f7 | 110 | |
<> | 144:ef7eb2e8f9f7 | 111 | /* Initialize */ |
<> | 144:ef7eb2e8f9f7 | 112 | RTC_Init(&init); |
<> | 144:ef7eb2e8f9f7 | 113 | |
<> | 144:ef7eb2e8f9f7 | 114 | blockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 115 | rtc_inited = true; |
<> | 144:ef7eb2e8f9f7 | 116 | } |
<> | 144:ef7eb2e8f9f7 | 117 | } |
<> | 144:ef7eb2e8f9f7 | 118 | |
<> | 144:ef7eb2e8f9f7 | 119 | void rtc_free(void) |
<> | 144:ef7eb2e8f9f7 | 120 | { |
<> | 144:ef7eb2e8f9f7 | 121 | rtc_free_real(RTC_INIT_RTC); |
<> | 144:ef7eb2e8f9f7 | 122 | } |
<> | 144:ef7eb2e8f9f7 | 123 | |
<> | 144:ef7eb2e8f9f7 | 124 | void rtc_free_real(uint32_t flags) |
<> | 144:ef7eb2e8f9f7 | 125 | { |
<> | 144:ef7eb2e8f9f7 | 126 | /* Clear use flag */ |
<> | 144:ef7eb2e8f9f7 | 127 | useflags &= ~flags; |
<> | 144:ef7eb2e8f9f7 | 128 | |
<> | 144:ef7eb2e8f9f7 | 129 | /* Disable the RTC if it was inited and is no longer in use by anyone. */ |
<> | 144:ef7eb2e8f9f7 | 130 | if (rtc_inited && (useflags == 0)) { |
<> | 144:ef7eb2e8f9f7 | 131 | NVIC_DisableIRQ(RTC_IRQn); |
<> | 144:ef7eb2e8f9f7 | 132 | RTC_Reset(); |
<> | 144:ef7eb2e8f9f7 | 133 | CMU_ClockEnable(cmuClock_RTC, false); |
<> | 144:ef7eb2e8f9f7 | 134 | unblockSleepMode(RTC_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 135 | rtc_inited = false; |
<> | 144:ef7eb2e8f9f7 | 136 | } |
<> | 144:ef7eb2e8f9f7 | 137 | } |
<> | 144:ef7eb2e8f9f7 | 138 | |
<> | 144:ef7eb2e8f9f7 | 139 | #else |
<> | 144:ef7eb2e8f9f7 | 140 | |
<> | 144:ef7eb2e8f9f7 | 141 | /* Using RTCC API */ |
<> | 144:ef7eb2e8f9f7 | 142 | |
<> | 144:ef7eb2e8f9f7 | 143 | #define RTCC_LEAST_ACTIVE_SLEEPMODE EM2 |
<> | 144:ef7eb2e8f9f7 | 144 | #define RTCC_NUM_BITS (32) |
<> | 144:ef7eb2e8f9f7 | 145 | |
<> | 144:ef7eb2e8f9f7 | 146 | void RTCC_IRQHandler(void) |
<> | 144:ef7eb2e8f9f7 | 147 | { |
<> | 144:ef7eb2e8f9f7 | 148 | uint32_t flags; |
<> | 144:ef7eb2e8f9f7 | 149 | flags = RTCC_IntGet(); |
<> | 144:ef7eb2e8f9f7 | 150 | |
<> | 144:ef7eb2e8f9f7 | 151 | if (flags & RTCC_IF_OF) { |
<> | 144:ef7eb2e8f9f7 | 152 | RTCC_IntClear(RTCC_IF_OF); |
<> | 144:ef7eb2e8f9f7 | 153 | /* RTC has overflowed (32 bits). Use time_extend as software counter for 32 more bits. */ |
<> | 144:ef7eb2e8f9f7 | 154 | time_extend += 1; |
<> | 144:ef7eb2e8f9f7 | 155 | } |
<> | 144:ef7eb2e8f9f7 | 156 | |
<> | 144:ef7eb2e8f9f7 | 157 | if (flags & RTCC_IF_CC0) { |
<> | 144:ef7eb2e8f9f7 | 158 | RTCC_IntClear(RTCC_IF_CC0); |
<> | 144:ef7eb2e8f9f7 | 159 | if (comp0_handler != NULL) { |
<> | 144:ef7eb2e8f9f7 | 160 | comp0_handler(); |
<> | 144:ef7eb2e8f9f7 | 161 | } |
<> | 144:ef7eb2e8f9f7 | 162 | } |
<> | 144:ef7eb2e8f9f7 | 163 | } |
<> | 144:ef7eb2e8f9f7 | 164 | |
<> | 144:ef7eb2e8f9f7 | 165 | uint32_t rtc_get_32bit(void) |
<> | 144:ef7eb2e8f9f7 | 166 | { |
<> | 144:ef7eb2e8f9f7 | 167 | return RTCC_CounterGet(); |
<> | 144:ef7eb2e8f9f7 | 168 | } |
<> | 144:ef7eb2e8f9f7 | 169 | |
<> | 144:ef7eb2e8f9f7 | 170 | uint64_t rtc_get_full(void) |
<> | 144:ef7eb2e8f9f7 | 171 | { |
<> | 144:ef7eb2e8f9f7 | 172 | uint64_t ticks = 0; |
<> | 144:ef7eb2e8f9f7 | 173 | ticks += time_extend; |
<> | 144:ef7eb2e8f9f7 | 174 | ticks = ticks << RTCC_NUM_BITS; |
<> | 144:ef7eb2e8f9f7 | 175 | ticks += RTCC_CounterGet(); |
<> | 144:ef7eb2e8f9f7 | 176 | return ticks; |
<> | 144:ef7eb2e8f9f7 | 177 | } |
<> | 144:ef7eb2e8f9f7 | 178 | |
<> | 144:ef7eb2e8f9f7 | 179 | void rtc_init_real(uint32_t flags) |
<> | 144:ef7eb2e8f9f7 | 180 | { |
<> | 144:ef7eb2e8f9f7 | 181 | useflags |= flags; |
<> | 144:ef7eb2e8f9f7 | 182 | |
<> | 144:ef7eb2e8f9f7 | 183 | if (!rtc_inited) { |
<> | 144:ef7eb2e8f9f7 | 184 | CMU_ClockEnable(cmuClock_RTCC, true); |
<> | 144:ef7eb2e8f9f7 | 185 | |
<> | 144:ef7eb2e8f9f7 | 186 | /* Enable clock to the interface of the low energy modules */ |
<> | 144:ef7eb2e8f9f7 | 187 | CMU_ClockEnable(cmuClock_CORELE, true); |
<> | 144:ef7eb2e8f9f7 | 188 | |
<> | 144:ef7eb2e8f9f7 | 189 | /* Initialize RTC */ |
<> | 144:ef7eb2e8f9f7 | 190 | RTCC_Init_TypeDef init = RTCC_INIT_DEFAULT; |
<> | 144:ef7eb2e8f9f7 | 191 | init.enable = 1; |
<> | 144:ef7eb2e8f9f7 | 192 | init.precntWrapOnCCV0 = false; |
<> | 144:ef7eb2e8f9f7 | 193 | init.cntWrapOnCCV1 = false; |
<> | 144:ef7eb2e8f9f7 | 194 | #if RTC_CLOCKDIV_INT == 8 |
<> | 144:ef7eb2e8f9f7 | 195 | init.presc = rtccCntPresc_8; |
<> | 144:ef7eb2e8f9f7 | 196 | #else |
<> | 144:ef7eb2e8f9f7 | 197 | #error invalid prescaler value RTC_CLOCKDIV_INT |
<> | 144:ef7eb2e8f9f7 | 198 | #endif |
<> | 144:ef7eb2e8f9f7 | 199 | |
<> | 144:ef7eb2e8f9f7 | 200 | /* Enable Interrupt from RTC */ |
<> | 144:ef7eb2e8f9f7 | 201 | RTCC_IntEnable(RTCC_IEN_OF); |
<> | 144:ef7eb2e8f9f7 | 202 | NVIC_SetVector(RTCC_IRQn, (uint32_t)RTCC_IRQHandler); |
<> | 144:ef7eb2e8f9f7 | 203 | NVIC_EnableIRQ(RTCC_IRQn); |
<> | 144:ef7eb2e8f9f7 | 204 | |
<> | 144:ef7eb2e8f9f7 | 205 | /* Initialize */ |
<> | 144:ef7eb2e8f9f7 | 206 | RTCC_Init(&init); |
<> | 144:ef7eb2e8f9f7 | 207 | |
<> | 144:ef7eb2e8f9f7 | 208 | blockSleepMode(RTCC_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 209 | rtc_inited = true; |
<> | 144:ef7eb2e8f9f7 | 210 | } |
<> | 144:ef7eb2e8f9f7 | 211 | } |
<> | 144:ef7eb2e8f9f7 | 212 | |
<> | 144:ef7eb2e8f9f7 | 213 | void rtc_free(void) |
<> | 144:ef7eb2e8f9f7 | 214 | { |
<> | 144:ef7eb2e8f9f7 | 215 | rtc_free_real(RTC_INIT_RTC); |
<> | 144:ef7eb2e8f9f7 | 216 | } |
<> | 144:ef7eb2e8f9f7 | 217 | |
<> | 144:ef7eb2e8f9f7 | 218 | void rtc_free_real(uint32_t flags) |
<> | 144:ef7eb2e8f9f7 | 219 | { |
<> | 144:ef7eb2e8f9f7 | 220 | /* Clear use flag */ |
<> | 144:ef7eb2e8f9f7 | 221 | useflags &= ~flags; |
<> | 144:ef7eb2e8f9f7 | 222 | |
<> | 144:ef7eb2e8f9f7 | 223 | /* Disable the RTC if it was inited and is no longer in use by anyone. */ |
<> | 144:ef7eb2e8f9f7 | 224 | if (rtc_inited && (useflags == 0)) { |
<> | 144:ef7eb2e8f9f7 | 225 | NVIC_DisableIRQ(RTCC_IRQn); |
<> | 144:ef7eb2e8f9f7 | 226 | RTCC_Reset(); |
<> | 144:ef7eb2e8f9f7 | 227 | CMU_ClockEnable(cmuClock_RTCC, false); |
<> | 144:ef7eb2e8f9f7 | 228 | unblockSleepMode(RTCC_LEAST_ACTIVE_SLEEPMODE); |
<> | 144:ef7eb2e8f9f7 | 229 | rtc_inited = false; |
<> | 144:ef7eb2e8f9f7 | 230 | } |
<> | 144:ef7eb2e8f9f7 | 231 | } |
<> | 144:ef7eb2e8f9f7 | 232 | |
<> | 144:ef7eb2e8f9f7 | 233 | #endif /* RTCC_COUNT */ |
<> | 144:ef7eb2e8f9f7 | 234 | |
<> | 144:ef7eb2e8f9f7 | 235 | void rtc_set_comp0_handler(uint32_t handler) |
<> | 144:ef7eb2e8f9f7 | 236 | { |
<> | 144:ef7eb2e8f9f7 | 237 | comp0_handler = (void (*)(void)) handler; |
<> | 144:ef7eb2e8f9f7 | 238 | } |
<> | 144:ef7eb2e8f9f7 | 239 | |
<> | 144:ef7eb2e8f9f7 | 240 | void rtc_init(void) |
<> | 144:ef7eb2e8f9f7 | 241 | { |
<> | 144:ef7eb2e8f9f7 | 242 | /* Register that the RTC is used for timekeeping. */ |
<> | 144:ef7eb2e8f9f7 | 243 | rtc_init_real(RTC_INIT_RTC); |
<> | 144:ef7eb2e8f9f7 | 244 | } |
<> | 144:ef7eb2e8f9f7 | 245 | |
<> | 144:ef7eb2e8f9f7 | 246 | int rtc_isenabled(void) |
<> | 144:ef7eb2e8f9f7 | 247 | { |
<> | 144:ef7eb2e8f9f7 | 248 | return rtc_inited; |
<> | 144:ef7eb2e8f9f7 | 249 | } |
<> | 144:ef7eb2e8f9f7 | 250 | |
<> | 144:ef7eb2e8f9f7 | 251 | time_t rtc_read(void) |
<> | 144:ef7eb2e8f9f7 | 252 | { |
<> | 144:ef7eb2e8f9f7 | 253 | return (time_t) (rtc_get_full() >> RTC_FREQ_SHIFT) + time_base; |
<> | 144:ef7eb2e8f9f7 | 254 | } |
<> | 144:ef7eb2e8f9f7 | 255 | |
<> | 144:ef7eb2e8f9f7 | 256 | time_t rtc_read_uncompensated(void) |
<> | 144:ef7eb2e8f9f7 | 257 | { |
<> | 144:ef7eb2e8f9f7 | 258 | return (time_t) (rtc_get_full() >> RTC_FREQ_SHIFT); |
<> | 144:ef7eb2e8f9f7 | 259 | } |
<> | 144:ef7eb2e8f9f7 | 260 | |
<> | 144:ef7eb2e8f9f7 | 261 | void rtc_write(time_t t) |
<> | 144:ef7eb2e8f9f7 | 262 | { |
<> | 144:ef7eb2e8f9f7 | 263 | /* We have to check that the RTC did not tick while doing this. */ |
<> | 144:ef7eb2e8f9f7 | 264 | /* If the RTC ticks we just redo this. */ |
<> | 144:ef7eb2e8f9f7 | 265 | uint32_t time; |
<> | 144:ef7eb2e8f9f7 | 266 | do { |
<> | 144:ef7eb2e8f9f7 | 267 | time = rtc_read_uncompensated(); |
<> | 144:ef7eb2e8f9f7 | 268 | time_base = t - time; |
<> | 144:ef7eb2e8f9f7 | 269 | } while (time != (uint32_t)rtc_read_uncompensated()); |
<> | 144:ef7eb2e8f9f7 | 270 | } |
<> | 144:ef7eb2e8f9f7 | 271 | |
<> | 144:ef7eb2e8f9f7 | 272 | #endif |