RTC auf true
hal/rtc_api.h@0:38ceb79fef03, 2018-11-28 (annotated)
- Committer:
- kevman
- Date:
- Wed Nov 28 15:10:15 2018 +0000
- Revision:
- 0:38ceb79fef03
RTC modified
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kevman | 0:38ceb79fef03 | 1 | /* mbed Microcontroller Library |
kevman | 0:38ceb79fef03 | 2 | * Copyright (c) 2006-2013 ARM Limited |
kevman | 0:38ceb79fef03 | 3 | * |
kevman | 0:38ceb79fef03 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
kevman | 0:38ceb79fef03 | 5 | * you may not use this file except in compliance with the License. |
kevman | 0:38ceb79fef03 | 6 | * You may obtain a copy of the License at |
kevman | 0:38ceb79fef03 | 7 | * |
kevman | 0:38ceb79fef03 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
kevman | 0:38ceb79fef03 | 9 | * |
kevman | 0:38ceb79fef03 | 10 | * Unless required by applicable law or agreed to in writing, software |
kevman | 0:38ceb79fef03 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
kevman | 0:38ceb79fef03 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
kevman | 0:38ceb79fef03 | 13 | * See the License for the specific language governing permissions and |
kevman | 0:38ceb79fef03 | 14 | * limitations under the License. |
kevman | 0:38ceb79fef03 | 15 | */ |
kevman | 0:38ceb79fef03 | 16 | |
kevman | 0:38ceb79fef03 | 17 | /** \addtogroup hal */ |
kevman | 0:38ceb79fef03 | 18 | /** @{*/ |
kevman | 0:38ceb79fef03 | 19 | |
kevman | 0:38ceb79fef03 | 20 | #ifndef MBED_RTC_API_H |
kevman | 0:38ceb79fef03 | 21 | #define MBED_RTC_API_H |
kevman | 0:38ceb79fef03 | 22 | |
kevman | 0:38ceb79fef03 | 23 | #include "device.h" |
kevman | 0:38ceb79fef03 | 24 | |
kevman | 0:38ceb79fef03 | 25 | #include <time.h> |
kevman | 0:38ceb79fef03 | 26 | |
kevman | 0:38ceb79fef03 | 27 | #ifdef __cplusplus |
kevman | 0:38ceb79fef03 | 28 | extern "C" { |
kevman | 0:38ceb79fef03 | 29 | #endif |
kevman | 0:38ceb79fef03 | 30 | |
kevman | 0:38ceb79fef03 | 31 | /** |
kevman | 0:38ceb79fef03 | 32 | * \defgroup hal_rtc RTC hal |
kevman | 0:38ceb79fef03 | 33 | * |
kevman | 0:38ceb79fef03 | 34 | * The RTC hal provides a low level interface to the Real Time Counter (RTC) of a |
kevman | 0:38ceb79fef03 | 35 | * target. |
kevman | 0:38ceb79fef03 | 36 | * |
kevman | 0:38ceb79fef03 | 37 | * # Defined behaviour |
kevman | 0:38ceb79fef03 | 38 | * * The function ::rtc_init is safe to call repeatedly - Verified by test ::rtc_init_test. |
kevman | 0:38ceb79fef03 | 39 | * * RTC accuracy is at least 10% - Verified by test ::rtc_accuracy_test. |
kevman | 0:38ceb79fef03 | 40 | * * Init/free doesn't stop RTC from counting - Verified by test ::rtc_persist_test. |
kevman | 0:38ceb79fef03 | 41 | * * Software reset doesn't stop RTC from counting - Verified by test ::rtc_reset_test. |
kevman | 0:38ceb79fef03 | 42 | * * Sleep modes don't stop RTC from counting - Verified by test ::rtc_sleep_test. |
kevman | 0:38ceb79fef03 | 43 | * * Shutdown mode doesn't stop RTC from counting - Not verified. |
kevman | 0:38ceb79fef03 | 44 | * * The functions ::rtc_write/::rtc_read provides availability to set/get RTC time |
kevman | 0:38ceb79fef03 | 45 | * - Verified by test ::rtc_write_read_test. |
kevman | 0:38ceb79fef03 | 46 | * * The functions ::rtc_isenabled returns 1 if the RTC is counting and the time has been set, |
kevman | 0:38ceb79fef03 | 47 | * 0 otherwise - Verified by test ::rtc_enabled_test. |
kevman | 0:38ceb79fef03 | 48 | * |
kevman | 0:38ceb79fef03 | 49 | * # Undefined behaviour |
kevman | 0:38ceb79fef03 | 50 | * * Calling any function other than ::rtc_init before the initialisation of the RTC |
kevman | 0:38ceb79fef03 | 51 | * |
kevman | 0:38ceb79fef03 | 52 | * # Potential bugs |
kevman | 0:38ceb79fef03 | 53 | * * Incorrect overflow handling - Verified by ::rtc_range_test |
kevman | 0:38ceb79fef03 | 54 | * * Glitches due to ripple counter - Verified by ::rtc_glitch_test |
kevman | 0:38ceb79fef03 | 55 | * |
kevman | 0:38ceb79fef03 | 56 | * @see hal_rtc_tests |
kevman | 0:38ceb79fef03 | 57 | * |
kevman | 0:38ceb79fef03 | 58 | * @{ |
kevman | 0:38ceb79fef03 | 59 | */ |
kevman | 0:38ceb79fef03 | 60 | |
kevman | 0:38ceb79fef03 | 61 | /** |
kevman | 0:38ceb79fef03 | 62 | * \defgroup hal_rtc_tests RTC hal tests |
kevman | 0:38ceb79fef03 | 63 | * The RTC test validate proper implementation of the RTC hal. |
kevman | 0:38ceb79fef03 | 64 | * |
kevman | 0:38ceb79fef03 | 65 | * To run the RTC hal tests use the command: |
kevman | 0:38ceb79fef03 | 66 | * |
kevman | 0:38ceb79fef03 | 67 | * mbed test -t <toolchain> -m <target> -n tests-mbed_hal-rtc* |
kevman | 0:38ceb79fef03 | 68 | */ |
kevman | 0:38ceb79fef03 | 69 | |
kevman | 0:38ceb79fef03 | 70 | |
kevman | 0:38ceb79fef03 | 71 | /** Initialize the RTC peripheral |
kevman | 0:38ceb79fef03 | 72 | * |
kevman | 0:38ceb79fef03 | 73 | * Powerup the RTC in perpetration for access. This function must be called |
kevman | 0:38ceb79fef03 | 74 | * before any other RTC functions ares called. This does not change the state |
kevman | 0:38ceb79fef03 | 75 | * of the RTC. It just enables access to it. |
kevman | 0:38ceb79fef03 | 76 | * |
kevman | 0:38ceb79fef03 | 77 | * @note This function is safe to call repeatedly - Tested by ::rtc_init_test |
kevman | 0:38ceb79fef03 | 78 | * |
kevman | 0:38ceb79fef03 | 79 | * Example Implementation Pseudo Code: |
kevman | 0:38ceb79fef03 | 80 | * @code |
kevman | 0:38ceb79fef03 | 81 | * void rtc_init() |
kevman | 0:38ceb79fef03 | 82 | * { |
kevman | 0:38ceb79fef03 | 83 | * // Enable clock gate so processor can read RTC registers |
kevman | 0:38ceb79fef03 | 84 | * POWER_CTRL |= POWER_CTRL_RTC_Msk; |
kevman | 0:38ceb79fef03 | 85 | * |
kevman | 0:38ceb79fef03 | 86 | * // See if the RTC is already setup |
kevman | 0:38ceb79fef03 | 87 | * if (!(RTC_STATUS & RTC_STATUS_COUNTING_Msk)) { |
kevman | 0:38ceb79fef03 | 88 | * |
kevman | 0:38ceb79fef03 | 89 | * // Setup the RTC clock source |
kevman | 0:38ceb79fef03 | 90 | * RTC_CTRL |= RTC_CTRL_CLK32_Msk; |
kevman | 0:38ceb79fef03 | 91 | * } |
kevman | 0:38ceb79fef03 | 92 | * } |
kevman | 0:38ceb79fef03 | 93 | * @endcode |
kevman | 0:38ceb79fef03 | 94 | */ |
kevman | 0:38ceb79fef03 | 95 | void rtc_init(void); |
kevman | 0:38ceb79fef03 | 96 | |
kevman | 0:38ceb79fef03 | 97 | /** Deinitialize RTC |
kevman | 0:38ceb79fef03 | 98 | * |
kevman | 0:38ceb79fef03 | 99 | * Powerdown the RTC in preparation for sleep, powerdown or reset. That should only |
kevman | 0:38ceb79fef03 | 100 | * affect the CPU domain and not the time keeping logic. |
kevman | 0:38ceb79fef03 | 101 | * After this function is called no other RTC functions should be called |
kevman | 0:38ceb79fef03 | 102 | * except for ::rtc_init. |
kevman | 0:38ceb79fef03 | 103 | * |
kevman | 0:38ceb79fef03 | 104 | * @note This function does not stop the RTC from counting - Tested by ::rtc_persist_test |
kevman | 0:38ceb79fef03 | 105 | * |
kevman | 0:38ceb79fef03 | 106 | * Example Implementation Pseudo Code: |
kevman | 0:38ceb79fef03 | 107 | * @code |
kevman | 0:38ceb79fef03 | 108 | * void rtc_free() |
kevman | 0:38ceb79fef03 | 109 | * { |
kevman | 0:38ceb79fef03 | 110 | * // Disable clock gate since processor no longer needs to read RTC registers |
kevman | 0:38ceb79fef03 | 111 | * POWER_CTRL &= ~POWER_CTRL_RTC_Msk; |
kevman | 0:38ceb79fef03 | 112 | * } |
kevman | 0:38ceb79fef03 | 113 | * @endcode |
kevman | 0:38ceb79fef03 | 114 | */ |
kevman | 0:38ceb79fef03 | 115 | void rtc_free(void); |
kevman | 0:38ceb79fef03 | 116 | |
kevman | 0:38ceb79fef03 | 117 | /** Check if the RTC has the time set and is counting |
kevman | 0:38ceb79fef03 | 118 | * |
kevman | 0:38ceb79fef03 | 119 | * @retval 0 The time reported by the RTC is not valid |
kevman | 0:38ceb79fef03 | 120 | * @retval 1 The time has been set the RTC is counting |
kevman | 0:38ceb79fef03 | 121 | * |
kevman | 0:38ceb79fef03 | 122 | * Example Implementation Pseudo Code: |
kevman | 0:38ceb79fef03 | 123 | * @code |
kevman | 0:38ceb79fef03 | 124 | * int rtc_isenabled() |
kevman | 0:38ceb79fef03 | 125 | * { |
kevman | 0:38ceb79fef03 | 126 | * if (RTC_STATUS & RTC_STATUS_COUNTING_Msk) { |
kevman | 0:38ceb79fef03 | 127 | * return 1; |
kevman | 0:38ceb79fef03 | 128 | * } else { |
kevman | 0:38ceb79fef03 | 129 | * return 0; |
kevman | 0:38ceb79fef03 | 130 | * } |
kevman | 0:38ceb79fef03 | 131 | * } |
kevman | 0:38ceb79fef03 | 132 | * @endcode |
kevman | 0:38ceb79fef03 | 133 | */ |
kevman | 0:38ceb79fef03 | 134 | int rtc_isenabled(void); |
kevman | 0:38ceb79fef03 | 135 | |
kevman | 0:38ceb79fef03 | 136 | /** Get the current time from the RTC peripheral |
kevman | 0:38ceb79fef03 | 137 | * |
kevman | 0:38ceb79fef03 | 138 | * @return The current time in seconds |
kevman | 0:38ceb79fef03 | 139 | * |
kevman | 0:38ceb79fef03 | 140 | * @note Some RTCs are not synchronized with the main clock. If |
kevman | 0:38ceb79fef03 | 141 | * this is the case with your RTC then you must read the RTC time |
kevman | 0:38ceb79fef03 | 142 | * in a loop to prevent reading the wrong time due to a glitch. |
kevman | 0:38ceb79fef03 | 143 | * The test ::rtc_glitch_test is intended to catch this bug. |
kevman | 0:38ceb79fef03 | 144 | * |
kevman | 0:38ceb79fef03 | 145 | * Example implementation for an unsynchronized ripple counter: |
kevman | 0:38ceb79fef03 | 146 | * @code |
kevman | 0:38ceb79fef03 | 147 | * time_t rtc_read() |
kevman | 0:38ceb79fef03 | 148 | * { |
kevman | 0:38ceb79fef03 | 149 | * uint32_t val; |
kevman | 0:38ceb79fef03 | 150 | * uint32_t last_val; |
kevman | 0:38ceb79fef03 | 151 | * |
kevman | 0:38ceb79fef03 | 152 | * // Loop until the same value is read twice |
kevman | 0:38ceb79fef03 | 153 | * val = RTC_SECONDS; |
kevman | 0:38ceb79fef03 | 154 | * do { |
kevman | 0:38ceb79fef03 | 155 | * last_val = val; |
kevman | 0:38ceb79fef03 | 156 | * val = RTC_SECONDS; |
kevman | 0:38ceb79fef03 | 157 | * } while (last_val != val); |
kevman | 0:38ceb79fef03 | 158 | * |
kevman | 0:38ceb79fef03 | 159 | * return (time_t)val; |
kevman | 0:38ceb79fef03 | 160 | * } |
kevman | 0:38ceb79fef03 | 161 | * @endcode |
kevman | 0:38ceb79fef03 | 162 | */ |
kevman | 0:38ceb79fef03 | 163 | time_t rtc_read(void); |
kevman | 0:38ceb79fef03 | 164 | |
kevman | 0:38ceb79fef03 | 165 | /** Write the current time in seconds to the RTC peripheral |
kevman | 0:38ceb79fef03 | 166 | * |
kevman | 0:38ceb79fef03 | 167 | * @param t The current time to be set in seconds. |
kevman | 0:38ceb79fef03 | 168 | * |
kevman | 0:38ceb79fef03 | 169 | * Example Implementation Pseudo Code: |
kevman | 0:38ceb79fef03 | 170 | * @code |
kevman | 0:38ceb79fef03 | 171 | * void rtc_write(time_t t) |
kevman | 0:38ceb79fef03 | 172 | * { |
kevman | 0:38ceb79fef03 | 173 | * RTC_SECONDS = t; |
kevman | 0:38ceb79fef03 | 174 | * } |
kevman | 0:38ceb79fef03 | 175 | * @endcode |
kevman | 0:38ceb79fef03 | 176 | */ |
kevman | 0:38ceb79fef03 | 177 | void rtc_write(time_t t); |
kevman | 0:38ceb79fef03 | 178 | |
kevman | 0:38ceb79fef03 | 179 | /**@}*/ |
kevman | 0:38ceb79fef03 | 180 | |
kevman | 0:38ceb79fef03 | 181 | #ifdef __cplusplus |
kevman | 0:38ceb79fef03 | 182 | } |
kevman | 0:38ceb79fef03 | 183 | #endif |
kevman | 0:38ceb79fef03 | 184 | |
kevman | 0:38ceb79fef03 | 185 | #endif |
kevman | 0:38ceb79fef03 | 186 | |
kevman | 0:38ceb79fef03 | 187 | /** @}*/ |