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hal/lp_ticker_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 |
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kevman | 0:38ceb79fef03 | 1 | |
kevman | 0:38ceb79fef03 | 2 | /** \addtogroup hal */ |
kevman | 0:38ceb79fef03 | 3 | /** @{*/ |
kevman | 0:38ceb79fef03 | 4 | /* mbed Microcontroller Library |
kevman | 0:38ceb79fef03 | 5 | * Copyright (c) 2015 ARM Limited |
kevman | 0:38ceb79fef03 | 6 | * |
kevman | 0:38ceb79fef03 | 7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
kevman | 0:38ceb79fef03 | 8 | * you may not use this file except in compliance with the License. |
kevman | 0:38ceb79fef03 | 9 | * You may obtain a copy of the License at |
kevman | 0:38ceb79fef03 | 10 | * |
kevman | 0:38ceb79fef03 | 11 | * http://www.apache.org/licenses/LICENSE-2.0 |
kevman | 0:38ceb79fef03 | 12 | * |
kevman | 0:38ceb79fef03 | 13 | * Unless required by applicable law or agreed to in writing, software |
kevman | 0:38ceb79fef03 | 14 | * distributed under the License is distributed on an "AS IS" BASIS, |
kevman | 0:38ceb79fef03 | 15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
kevman | 0:38ceb79fef03 | 16 | * See the License for the specific language governing permissions and |
kevman | 0:38ceb79fef03 | 17 | * limitations under the License. |
kevman | 0:38ceb79fef03 | 18 | */ |
kevman | 0:38ceb79fef03 | 19 | #ifndef MBED_LPTICKER_API_H |
kevman | 0:38ceb79fef03 | 20 | #define MBED_LPTICKER_API_H |
kevman | 0:38ceb79fef03 | 21 | |
kevman | 0:38ceb79fef03 | 22 | #include "device.h" |
kevman | 0:38ceb79fef03 | 23 | |
kevman | 0:38ceb79fef03 | 24 | #if DEVICE_LPTICKER |
kevman | 0:38ceb79fef03 | 25 | |
kevman | 0:38ceb79fef03 | 26 | #include "hal/ticker_api.h" |
kevman | 0:38ceb79fef03 | 27 | |
kevman | 0:38ceb79fef03 | 28 | #ifdef __cplusplus |
kevman | 0:38ceb79fef03 | 29 | extern "C" { |
kevman | 0:38ceb79fef03 | 30 | #endif |
kevman | 0:38ceb79fef03 | 31 | |
kevman | 0:38ceb79fef03 | 32 | /** |
kevman | 0:38ceb79fef03 | 33 | * \defgroup hal_lp_ticker Low Power Ticker |
kevman | 0:38ceb79fef03 | 34 | * Low level interface to the low power ticker of a target |
kevman | 0:38ceb79fef03 | 35 | * |
kevman | 0:38ceb79fef03 | 36 | * # Defined behavior |
kevman | 0:38ceb79fef03 | 37 | * * Has a reported frequency between 4KHz and 64KHz - verified by ::lp_ticker_info_test |
kevman | 0:38ceb79fef03 | 38 | * * Has a counter that is at least 12 bits wide - verified by ::lp_ticker_info_test |
kevman | 0:38ceb79fef03 | 39 | * * Continues operating in deep sleep mode - verified by ::lp_ticker_deepsleep_test |
kevman | 0:38ceb79fef03 | 40 | * * All behavior defined by the @ref hal_ticker_shared "ticker specification" |
kevman | 0:38ceb79fef03 | 41 | * |
kevman | 0:38ceb79fef03 | 42 | * # Undefined behavior |
kevman | 0:38ceb79fef03 | 43 | * * See the @ref hal_ticker_shared "ticker specification" |
kevman | 0:38ceb79fef03 | 44 | * * Calling any function other than lp_ticker_init after calling lp_ticker_free |
kevman | 0:38ceb79fef03 | 45 | * |
kevman | 0:38ceb79fef03 | 46 | * # Potential bugs |
kevman | 0:38ceb79fef03 | 47 | * * Glitches due to ripple counter - Verified by ::lp_ticker_glitch_test |
kevman | 0:38ceb79fef03 | 48 | * |
kevman | 0:38ceb79fef03 | 49 | * @see hal_lp_ticker_tests |
kevman | 0:38ceb79fef03 | 50 | * |
kevman | 0:38ceb79fef03 | 51 | * @{ |
kevman | 0:38ceb79fef03 | 52 | */ |
kevman | 0:38ceb79fef03 | 53 | |
kevman | 0:38ceb79fef03 | 54 | /** |
kevman | 0:38ceb79fef03 | 55 | * \defgroup hal_lp_ticker_tests Low Power Ticker tests |
kevman | 0:38ceb79fef03 | 56 | * Tests to validate the proper implementation of the low power ticker |
kevman | 0:38ceb79fef03 | 57 | * |
kevman | 0:38ceb79fef03 | 58 | * To run the low power ticker hal tests use the command: |
kevman | 0:38ceb79fef03 | 59 | * |
kevman | 0:38ceb79fef03 | 60 | * mbed test -t <toolchain> -m <target> -n tests-mbed_hal-common_ticker*,tests-mbed_hal-lp_ticker* |
kevman | 0:38ceb79fef03 | 61 | * |
kevman | 0:38ceb79fef03 | 62 | */ |
kevman | 0:38ceb79fef03 | 63 | |
kevman | 0:38ceb79fef03 | 64 | typedef void (*ticker_irq_handler_type)(const ticker_data_t *const); |
kevman | 0:38ceb79fef03 | 65 | |
kevman | 0:38ceb79fef03 | 66 | /** Set low power ticker IRQ handler |
kevman | 0:38ceb79fef03 | 67 | * |
kevman | 0:38ceb79fef03 | 68 | * @param ticker_irq_handler IRQ handler to be connected |
kevman | 0:38ceb79fef03 | 69 | * |
kevman | 0:38ceb79fef03 | 70 | * @return previous ticker IRQ handler |
kevman | 0:38ceb79fef03 | 71 | * |
kevman | 0:38ceb79fef03 | 72 | * @note by default IRQ handler is set to ::ticker_irq_handler |
kevman | 0:38ceb79fef03 | 73 | * @note this function is primarily for testing purposes and it's not required part of HAL implementation |
kevman | 0:38ceb79fef03 | 74 | * |
kevman | 0:38ceb79fef03 | 75 | */ |
kevman | 0:38ceb79fef03 | 76 | ticker_irq_handler_type set_lp_ticker_irq_handler(ticker_irq_handler_type ticker_irq_handler); |
kevman | 0:38ceb79fef03 | 77 | |
kevman | 0:38ceb79fef03 | 78 | /** Get low power ticker's data |
kevman | 0:38ceb79fef03 | 79 | * |
kevman | 0:38ceb79fef03 | 80 | * @return The low power ticker data |
kevman | 0:38ceb79fef03 | 81 | */ |
kevman | 0:38ceb79fef03 | 82 | const ticker_data_t *get_lp_ticker_data(void); |
kevman | 0:38ceb79fef03 | 83 | |
kevman | 0:38ceb79fef03 | 84 | /** The wrapper for ticker_irq_handler, to pass lp ticker's data |
kevman | 0:38ceb79fef03 | 85 | * |
kevman | 0:38ceb79fef03 | 86 | */ |
kevman | 0:38ceb79fef03 | 87 | void lp_ticker_irq_handler(void); |
kevman | 0:38ceb79fef03 | 88 | |
kevman | 0:38ceb79fef03 | 89 | /* HAL lp ticker */ |
kevman | 0:38ceb79fef03 | 90 | |
kevman | 0:38ceb79fef03 | 91 | /** Initialize the low power ticker |
kevman | 0:38ceb79fef03 | 92 | * |
kevman | 0:38ceb79fef03 | 93 | * Initialize or re-initialize the ticker. This resets all the |
kevman | 0:38ceb79fef03 | 94 | * clocking and prescaler registers, along with disabling |
kevman | 0:38ceb79fef03 | 95 | * the compare interrupt. |
kevman | 0:38ceb79fef03 | 96 | * |
kevman | 0:38ceb79fef03 | 97 | * Pseudo Code: |
kevman | 0:38ceb79fef03 | 98 | * @code |
kevman | 0:38ceb79fef03 | 99 | * void lp_ticker_init() |
kevman | 0:38ceb79fef03 | 100 | * { |
kevman | 0:38ceb79fef03 | 101 | * // Enable clock gate so processor can read LPTMR registers |
kevman | 0:38ceb79fef03 | 102 | * POWER_CTRL |= POWER_CTRL_LPTMR_Msk; |
kevman | 0:38ceb79fef03 | 103 | * |
kevman | 0:38ceb79fef03 | 104 | * // Disable the timer and ensure it is powered down |
kevman | 0:38ceb79fef03 | 105 | * LPTMR_CTRL &= ~(LPTMR_CTRL_ENABLE_Msk | LPTMR_CTRL_COMPARE_ENABLE_Msk); |
kevman | 0:38ceb79fef03 | 106 | * |
kevman | 0:38ceb79fef03 | 107 | * // Configure divisors - no division necessary |
kevman | 0:38ceb79fef03 | 108 | * LPTMR_PRESCALE = 0; |
kevman | 0:38ceb79fef03 | 109 | * LPTMR_CTRL |= LPTMR_CTRL_ENABLE_Msk; |
kevman | 0:38ceb79fef03 | 110 | * |
kevman | 0:38ceb79fef03 | 111 | * // Install the interrupt handler |
kevman | 0:38ceb79fef03 | 112 | * NVIC_SetVector(LPTMR_IRQn, (uint32_t)lp_ticker_irq_handler); |
kevman | 0:38ceb79fef03 | 113 | * NVIC_EnableIRQ(LPTMR_IRQn); |
kevman | 0:38ceb79fef03 | 114 | * } |
kevman | 0:38ceb79fef03 | 115 | * @endcode |
kevman | 0:38ceb79fef03 | 116 | */ |
kevman | 0:38ceb79fef03 | 117 | void lp_ticker_init(void); |
kevman | 0:38ceb79fef03 | 118 | |
kevman | 0:38ceb79fef03 | 119 | /** Deinitialize the lower power ticker |
kevman | 0:38ceb79fef03 | 120 | * |
kevman | 0:38ceb79fef03 | 121 | * Powerdown the lp ticker in preparation for sleep, powerdown, or reset. |
kevman | 0:38ceb79fef03 | 122 | * |
kevman | 0:38ceb79fef03 | 123 | * After calling this function no other ticker functions should be called except |
kevman | 0:38ceb79fef03 | 124 | * lp_ticker_init(). Calling any function other than init after freeing is |
kevman | 0:38ceb79fef03 | 125 | * undefined. |
kevman | 0:38ceb79fef03 | 126 | * |
kevman | 0:38ceb79fef03 | 127 | * @note This function stops the ticker from counting. |
kevman | 0:38ceb79fef03 | 128 | */ |
kevman | 0:38ceb79fef03 | 129 | void lp_ticker_free(void); |
kevman | 0:38ceb79fef03 | 130 | |
kevman | 0:38ceb79fef03 | 131 | /** Read the current tick |
kevman | 0:38ceb79fef03 | 132 | * |
kevman | 0:38ceb79fef03 | 133 | * If no rollover has occurred, the seconds passed since lp_ticker_init() |
kevman | 0:38ceb79fef03 | 134 | * was called can be found by dividing the ticks returned by this function |
kevman | 0:38ceb79fef03 | 135 | * by the frequency returned by ::lp_ticker_get_info. |
kevman | 0:38ceb79fef03 | 136 | * |
kevman | 0:38ceb79fef03 | 137 | * @return The current timer's counter value in ticks |
kevman | 0:38ceb79fef03 | 138 | * |
kevman | 0:38ceb79fef03 | 139 | * Pseudo Code: |
kevman | 0:38ceb79fef03 | 140 | * @code |
kevman | 0:38ceb79fef03 | 141 | * uint32_t lp_ticker_read() |
kevman | 0:38ceb79fef03 | 142 | * { |
kevman | 0:38ceb79fef03 | 143 | * uint16_t count; |
kevman | 0:38ceb79fef03 | 144 | * uint16_t last_count; |
kevman | 0:38ceb79fef03 | 145 | * |
kevman | 0:38ceb79fef03 | 146 | * // Loop until the same tick is read twice since this |
kevman | 0:38ceb79fef03 | 147 | * // is ripple counter on a different clock domain. |
kevman | 0:38ceb79fef03 | 148 | * count = LPTMR_COUNT; |
kevman | 0:38ceb79fef03 | 149 | * do { |
kevman | 0:38ceb79fef03 | 150 | * last_count = count; |
kevman | 0:38ceb79fef03 | 151 | * count = LPTMR_COUNT; |
kevman | 0:38ceb79fef03 | 152 | * } while (last_count != count); |
kevman | 0:38ceb79fef03 | 153 | * |
kevman | 0:38ceb79fef03 | 154 | * return count; |
kevman | 0:38ceb79fef03 | 155 | * } |
kevman | 0:38ceb79fef03 | 156 | * @endcode |
kevman | 0:38ceb79fef03 | 157 | */ |
kevman | 0:38ceb79fef03 | 158 | uint32_t lp_ticker_read(void); |
kevman | 0:38ceb79fef03 | 159 | |
kevman | 0:38ceb79fef03 | 160 | /** Set interrupt for specified timestamp |
kevman | 0:38ceb79fef03 | 161 | * |
kevman | 0:38ceb79fef03 | 162 | * @param timestamp The time in ticks to be set |
kevman | 0:38ceb79fef03 | 163 | * |
kevman | 0:38ceb79fef03 | 164 | * @note no special handling needs to be done for times in the past |
kevman | 0:38ceb79fef03 | 165 | * as the common timer code will detect this and call |
kevman | 0:38ceb79fef03 | 166 | * lp_ticker_fire_interrupt() if this is the case |
kevman | 0:38ceb79fef03 | 167 | * |
kevman | 0:38ceb79fef03 | 168 | * @note calling this function with timestamp of more than the supported |
kevman | 0:38ceb79fef03 | 169 | * number of bits returned by ::lp_ticker_get_info results in undefined |
kevman | 0:38ceb79fef03 | 170 | * behavior. |
kevman | 0:38ceb79fef03 | 171 | * |
kevman | 0:38ceb79fef03 | 172 | * Pseudo Code: |
kevman | 0:38ceb79fef03 | 173 | * @code |
kevman | 0:38ceb79fef03 | 174 | * void lp_ticker_set_interrupt(timestamp_t timestamp) |
kevman | 0:38ceb79fef03 | 175 | * { |
kevman | 0:38ceb79fef03 | 176 | * LPTMR_COMPARE = timestamp; |
kevman | 0:38ceb79fef03 | 177 | * LPTMR_CTRL |= LPTMR_CTRL_COMPARE_ENABLE_Msk; |
kevman | 0:38ceb79fef03 | 178 | * } |
kevman | 0:38ceb79fef03 | 179 | * @endcode |
kevman | 0:38ceb79fef03 | 180 | */ |
kevman | 0:38ceb79fef03 | 181 | void lp_ticker_set_interrupt(timestamp_t timestamp); |
kevman | 0:38ceb79fef03 | 182 | |
kevman | 0:38ceb79fef03 | 183 | /** Disable low power ticker interrupt |
kevman | 0:38ceb79fef03 | 184 | * |
kevman | 0:38ceb79fef03 | 185 | * Pseudo Code: |
kevman | 0:38ceb79fef03 | 186 | * @code |
kevman | 0:38ceb79fef03 | 187 | * void lp_ticker_disable_interrupt(void) |
kevman | 0:38ceb79fef03 | 188 | * { |
kevman | 0:38ceb79fef03 | 189 | * // Disable the compare interrupt |
kevman | 0:38ceb79fef03 | 190 | * LPTMR_CTRL &= ~LPTMR_CTRL_COMPARE_ENABLE_Msk; |
kevman | 0:38ceb79fef03 | 191 | * } |
kevman | 0:38ceb79fef03 | 192 | * @endcode |
kevman | 0:38ceb79fef03 | 193 | */ |
kevman | 0:38ceb79fef03 | 194 | void lp_ticker_disable_interrupt(void); |
kevman | 0:38ceb79fef03 | 195 | |
kevman | 0:38ceb79fef03 | 196 | /** Clear the low power ticker interrupt |
kevman | 0:38ceb79fef03 | 197 | * |
kevman | 0:38ceb79fef03 | 198 | * Pseudo Code: |
kevman | 0:38ceb79fef03 | 199 | * @code |
kevman | 0:38ceb79fef03 | 200 | * void lp_ticker_clear_interrupt(void) |
kevman | 0:38ceb79fef03 | 201 | * { |
kevman | 0:38ceb79fef03 | 202 | * // Write to the ICR (interrupt clear register) of the LPTMR |
kevman | 0:38ceb79fef03 | 203 | * LPTMR_ICR = LPTMR_ICR_COMPARE_Msk; |
kevman | 0:38ceb79fef03 | 204 | * } |
kevman | 0:38ceb79fef03 | 205 | * @endcode |
kevman | 0:38ceb79fef03 | 206 | */ |
kevman | 0:38ceb79fef03 | 207 | void lp_ticker_clear_interrupt(void); |
kevman | 0:38ceb79fef03 | 208 | |
kevman | 0:38ceb79fef03 | 209 | /** Set pending interrupt that should be fired right away. |
kevman | 0:38ceb79fef03 | 210 | * |
kevman | 0:38ceb79fef03 | 211 | * Pseudo Code: |
kevman | 0:38ceb79fef03 | 212 | * @code |
kevman | 0:38ceb79fef03 | 213 | * void lp_ticker_fire_interrupt(void) |
kevman | 0:38ceb79fef03 | 214 | * { |
kevman | 0:38ceb79fef03 | 215 | * NVIC_SetPendingIRQ(LPTMR_IRQn); |
kevman | 0:38ceb79fef03 | 216 | * } |
kevman | 0:38ceb79fef03 | 217 | * @endcode |
kevman | 0:38ceb79fef03 | 218 | */ |
kevman | 0:38ceb79fef03 | 219 | void lp_ticker_fire_interrupt(void); |
kevman | 0:38ceb79fef03 | 220 | |
kevman | 0:38ceb79fef03 | 221 | /** Get frequency and counter bits of this ticker. |
kevman | 0:38ceb79fef03 | 222 | * |
kevman | 0:38ceb79fef03 | 223 | * Pseudo Code: |
kevman | 0:38ceb79fef03 | 224 | * @code |
kevman | 0:38ceb79fef03 | 225 | * const ticker_info_t* lp_ticker_get_info() |
kevman | 0:38ceb79fef03 | 226 | * { |
kevman | 0:38ceb79fef03 | 227 | * static const ticker_info_t info = { |
kevman | 0:38ceb79fef03 | 228 | * 32768, // 32KHz |
kevman | 0:38ceb79fef03 | 229 | * 16 // 16 bit counter |
kevman | 0:38ceb79fef03 | 230 | * }; |
kevman | 0:38ceb79fef03 | 231 | * return &info; |
kevman | 0:38ceb79fef03 | 232 | * } |
kevman | 0:38ceb79fef03 | 233 | * @endcode |
kevman | 0:38ceb79fef03 | 234 | */ |
kevman | 0:38ceb79fef03 | 235 | const ticker_info_t *lp_ticker_get_info(void); |
kevman | 0:38ceb79fef03 | 236 | |
kevman | 0:38ceb79fef03 | 237 | /**@}*/ |
kevman | 0:38ceb79fef03 | 238 | |
kevman | 0:38ceb79fef03 | 239 | #ifdef __cplusplus |
kevman | 0:38ceb79fef03 | 240 | } |
kevman | 0:38ceb79fef03 | 241 | #endif |
kevman | 0:38ceb79fef03 | 242 | |
kevman | 0:38ceb79fef03 | 243 | #endif |
kevman | 0:38ceb79fef03 | 244 | |
kevman | 0:38ceb79fef03 | 245 | #endif |
kevman | 0:38ceb79fef03 | 246 | |
kevman | 0:38ceb79fef03 | 247 | /** @}*/ |