mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

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targets/TARGET_ublox/TARGET_HI2110/lp_ticker.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
188:bcfe06ba3d64 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 150:02e0a0aed4ec 1 /* mbed Microcontroller Library
<> 150:02e0a0aed4ec 2 * Copyright (c) 2016 u-blox
<> 150:02e0a0aed4ec 3 *
<> 150:02e0a0aed4ec 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 150:02e0a0aed4ec 5 * you may not use this file except in compliance with the License.
<> 150:02e0a0aed4ec 6 * You may obtain a copy of the License at
<> 150:02e0a0aed4ec 7 *
<> 150:02e0a0aed4ec 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 150:02e0a0aed4ec 9 *
<> 150:02e0a0aed4ec 10 * Unless required by applicable law or agreed to in writing, software
<> 150:02e0a0aed4ec 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 150:02e0a0aed4ec 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 150:02e0a0aed4ec 13 * See the License for the specific language governing permissions and
<> 150:02e0a0aed4ec 14 * limitations under the License.
<> 150:02e0a0aed4ec 15 */
<> 150:02e0a0aed4ec 16
<> 150:02e0a0aed4ec 17 /* The LP Ticker performs two functions for mbed:
<> 150:02e0a0aed4ec 18 *
<> 150:02e0a0aed4ec 19 * 1. Allows tracking of the passage of time.
<> 150:02e0a0aed4ec 20 * 2. Allows the system to enter the lowest power
<> 150:02e0a0aed4ec 21 * state for a given time.
<> 150:02e0a0aed4ec 22 *
<> 150:02e0a0aed4ec 23 * For this to work the single RTC interrupt needs
<> 150:02e0a0aed4ec 24 * to perform two functions. It needs to increment
<> 150:02e0a0aed4ec 25 * an overflow counter at every 32-bit overflow without
<> 150:02e0a0aed4ec 26 * otherwise affecting the system state (i.e. not waking it
<> 150:02e0a0aed4ec 27 * up and not putting it to sleep) and, when requested,
<> 150:02e0a0aed4ec 28 * it *also* needs to wake the system up from sleep
<> 150:02e0a0aed4ec 29 * at a specific time. Note also that the units of time
<> 150:02e0a0aed4ec 30 * from an mbed perspective are useconds, whereas the RTC
<> 150:02e0a0aed4ec 31 * is clocked at 32 kHz, hence there is conversion to be done.
<> 150:02e0a0aed4ec 32 *
<> 150:02e0a0aed4ec 33 * Since it is not possible to reset the RTC, we maintain
<> 150:02e0a0aed4ec 34 * a 32-bit window on it, starting at g_last_32bit_overflow_value
<> 150:02e0a0aed4ec 35 * and ending at g_next_32bit_overflow_value. All values
<> 150:02e0a0aed4ec 36 * fed back up to mbed are relative to g_last_32bit_overflow_value.
<> 150:02e0a0aed4ec 37 */
<> 150:02e0a0aed4ec 38
<> 150:02e0a0aed4ec 39 #include "lp_ticker_api.h"
<> 150:02e0a0aed4ec 40 #include "sleep_api.h"
<> 160:d5399cc887bb 41 #include "mbed_critical.h"
<> 150:02e0a0aed4ec 42
<> 150:02e0a0aed4ec 43 /* ----------------------------------------------------------------
<> 150:02e0a0aed4ec 44 * MACROS
<> 150:02e0a0aed4ec 45 * ----------------------------------------------------------------*/
<> 150:02e0a0aed4ec 46
<> 150:02e0a0aed4ec 47 /* The maximum value of the RTC (48 bits) */
<> 150:02e0a0aed4ec 48 #define RTC_MAX 0x0000FFFFFFFFFFFFULL
<> 150:02e0a0aed4ec 49
<> 150:02e0a0aed4ec 50 /* RTC modulo */
<> 150:02e0a0aed4ec 51 #define RTC_MODULO (RTC_MAX + 1)
<> 150:02e0a0aed4ec 52
<> 150:02e0a0aed4ec 53 /* The 32-bit overflow value */
<> 150:02e0a0aed4ec 54 #define MODULO_32BIT 0x100000000ULL
<> 150:02e0a0aed4ec 55
<> 150:02e0a0aed4ec 56 /* Macro to increment a 64-bit RTC value x by y, with wrap */
<> 150:02e0a0aed4ec 57 #define INCREMENT_MOD(x, y) (x = ((uint64_t) x + (uint64_t) y) % RTC_MODULO)
<> 150:02e0a0aed4ec 58
<> 150:02e0a0aed4ec 59 /* Macro to get MSBs from a 64-bit integer */
<> 150:02e0a0aed4ec 60 #define MSBS(x) ((uint32_t) ((uint64_t) (x) >> 32))
<> 150:02e0a0aed4ec 61
<> 150:02e0a0aed4ec 62 /* Macro to get LSBs from a 64-bit integer */
<> 150:02e0a0aed4ec 63 #define LSBS(x) ((uint32_t) (x))
<> 150:02e0a0aed4ec 64
<> 150:02e0a0aed4ec 65 /* ----------------------------------------------------------------
<> 150:02e0a0aed4ec 66 * TYPES
<> 150:02e0a0aed4ec 67 * ----------------------------------------------------------------*/
<> 150:02e0a0aed4ec 68
<> 150:02e0a0aed4ec 69 /* ----------------------------------------------------------------
<> 150:02e0a0aed4ec 70 * GLOBAL VARIABLES
<> 150:02e0a0aed4ec 71 * ----------------------------------------------------------------*/
<> 150:02e0a0aed4ec 72
<> 150:02e0a0aed4ec 73 /* Incremented each time the RTC goes over 32 bits */
<> 150:02e0a0aed4ec 74 static uint32_t g_overflow_count = 0;
<> 150:02e0a0aed4ec 75
<> 150:02e0a0aed4ec 76 /* Set when a user interrupt has been requested but an overflow
<> 150:02e0a0aed4ec 77 * interrupt needs to happen first */
<> 150:02e0a0aed4ec 78 static bool g_user_interrupt_pending = false;
<> 150:02e0a0aed4ec 79
<> 150:02e0a0aed4ec 80 /* Set when a user interrupt is the next interrupt to happen */
<> 150:02e0a0aed4ec 81 static bool g_user_interrupt_set = false;
<> 150:02e0a0aed4ec 82
<> 150:02e0a0aed4ec 83 /* Initialised flag, used to protect against interrupts going
<> 150:02e0a0aed4ec 84 * off before we're initialised */
<> 150:02e0a0aed4ec 85 static bool g_initialised = false;
<> 150:02e0a0aed4ec 86
<> 150:02e0a0aed4ec 87 /* The next overflow value to be used */
<> 150:02e0a0aed4ec 88 static uint64_t g_next_32bit_overflow_value;
<> 150:02e0a0aed4ec 89
<> 150:02e0a0aed4ec 90 /* The next match-compare value to be used */
<> 150:02e0a0aed4ec 91 static uint64_t g_next_compare_value;
<> 150:02e0a0aed4ec 92
<> 150:02e0a0aed4ec 93 /* Keep track of the previous 32-bit overflow
<> 150:02e0a0aed4ec 94 * value so that we can report 32-bit time
<> 150:02e0a0aed4ec 95 * correctly */
<> 150:02e0a0aed4ec 96 static uint64_t g_last_32bit_overflow_value;
<> 150:02e0a0aed4ec 97
<> 150:02e0a0aed4ec 98 /* ----------------------------------------------------------------
<> 150:02e0a0aed4ec 99 * FUNCTION PROTOTYPES
<> 150:02e0a0aed4ec 100 * ----------------------------------------------------------------*/
<> 150:02e0a0aed4ec 101
<> 150:02e0a0aed4ec 102 static void set_interrupt_to_32bit_overflow(void);
<> 150:02e0a0aed4ec 103 static void set_interrupt_to_user_value(void);
<> 150:02e0a0aed4ec 104
<> 150:02e0a0aed4ec 105 /* ----------------------------------------------------------------
<> 150:02e0a0aed4ec 106 * STATIC FUNCTIONS
<> 150:02e0a0aed4ec 107 * ----------------------------------------------------------------*/
<> 150:02e0a0aed4ec 108
<> 150:02e0a0aed4ec 109 /* Convert a tick value (32,768 Hz) into a microsecond value */
<> 150:02e0a0aed4ec 110 static inline uint32_t ticksToUSeconds(uint32_t x)
<> 150:02e0a0aed4ec 111 {
<> 150:02e0a0aed4ec 112 /* TODO: find a way to avoid the multiply by 1000000
<> 150:02e0a0aed4ec 113 * Shift by 20 would introduce a 5% error, which is
<> 150:02e0a0aed4ec 114 * probably too much */
<> 150:02e0a0aed4ec 115 uint64_t result = ((((uint64_t) x) * 1000000) >> 15);
<> 150:02e0a0aed4ec 116
<> 150:02e0a0aed4ec 117 if (result > 0xFFFFFFFF) {
<> 150:02e0a0aed4ec 118 result = 0xFFFFFFFF;
<> 150:02e0a0aed4ec 119 }
<> 150:02e0a0aed4ec 120
<> 150:02e0a0aed4ec 121 return (uint32_t) result;
<> 150:02e0a0aed4ec 122 }
<> 150:02e0a0aed4ec 123
<> 150:02e0a0aed4ec 124 /* Convert a microsecond value into a tick value (32,768 Hz) */
<> 150:02e0a0aed4ec 125 static inline uint32_t uSecondsToTicks(uint32_t x)
<> 150:02e0a0aed4ec 126 {
<> 150:02e0a0aed4ec 127 /* TODO: find a way to avoid the divide by 1000000
<> 150:02e0a0aed4ec 128 * Shift by 20 would introduce a 5% error, which is
<> 150:02e0a0aed4ec 129 * probably too much */
<> 150:02e0a0aed4ec 130 return (uint32_t) ((((uint64_t) x) << 15) / 1000000);
<> 150:02e0a0aed4ec 131 }
<> 150:02e0a0aed4ec 132
<> 150:02e0a0aed4ec 133 /* Take g_next_32bit_overflow_value and apply it to g_next_compare_value and
<> 150:02e0a0aed4ec 134 * then the chip registers
<> 150:02e0a0aed4ec 135 * NOTE: the RTC interrupt should be disabled when calling this function */
<> 150:02e0a0aed4ec 136 static inline void set_interrupt_to_32bit_overflow()
<> 150:02e0a0aed4ec 137 {
<> 150:02e0a0aed4ec 138 /* Load up the values */
<> 150:02e0a0aed4ec 139 g_next_compare_value = g_next_32bit_overflow_value;
<> 150:02e0a0aed4ec 140
<> 150:02e0a0aed4ec 141 /* Set up the match register values */
<> 150:02e0a0aed4ec 142 RTC_IRQ_TIME_MSBS = MSBS(g_next_compare_value);
<> 150:02e0a0aed4ec 143 RTC_IRQ_TIME_LSBS = LSBS(g_next_compare_value);
<> 150:02e0a0aed4ec 144 }
<> 150:02e0a0aed4ec 145
<> 150:02e0a0aed4ec 146 /* Take g_next_compare_value and apply it to the chip registers
<> 150:02e0a0aed4ec 147 * NOTE: the RTC interrupt should be disabled when calling this function */
<> 150:02e0a0aed4ec 148 static inline void set_interrupt_to_user_value()
<> 150:02e0a0aed4ec 149 {
<> 150:02e0a0aed4ec 150 g_user_interrupt_set = true;
<> 150:02e0a0aed4ec 151
<> 150:02e0a0aed4ec 152 /* Write MSBS first, then the value is latched on LSBS write */
<> 150:02e0a0aed4ec 153 RTC_IRQ_TIME_MSBS = MSBS(g_next_compare_value);
<> 150:02e0a0aed4ec 154 RTC_IRQ_TIME_LSBS = LSBS(g_next_compare_value);
<> 150:02e0a0aed4ec 155 }
<> 150:02e0a0aed4ec 156
<> 150:02e0a0aed4ec 157 /* Get the RTC value
<> 150:02e0a0aed4ec 158 * NOTE: the RTC interrupt should be disabled when calling this function */
<> 150:02e0a0aed4ec 159 static inline uint64_t get_rtc_value()
<> 150:02e0a0aed4ec 160 {
<> 150:02e0a0aed4ec 161 uint64_t rtc_value;
<> 150:02e0a0aed4ec 162
<> 150:02e0a0aed4ec 163 rtc_value = ((uint64_t) RTC_TIME_MSBS) << 32;
<> 150:02e0a0aed4ec 164 rtc_value |= RTC_TIME_LSBS;
<> 150:02e0a0aed4ec 165
<> 150:02e0a0aed4ec 166 return rtc_value;
<> 150:02e0a0aed4ec 167 }
<> 150:02e0a0aed4ec 168
<> 150:02e0a0aed4ec 169 /* ----------------------------------------------------------------
<> 150:02e0a0aed4ec 170 * NON-API FUNCTIONS
<> 150:02e0a0aed4ec 171 * ----------------------------------------------------------------*/
<> 150:02e0a0aed4ec 172
<> 150:02e0a0aed4ec 173 /* RTC handler */
<> 150:02e0a0aed4ec 174 void IRQ0_RTC_Handler(void)
<> 150:02e0a0aed4ec 175 {
<> 150:02e0a0aed4ec 176 /* Have seen this interrupt occurring before initialisation, so guard
<> 150:02e0a0aed4ec 177 * against that */
<> 150:02e0a0aed4ec 178 if (g_initialised) {
<> 150:02e0a0aed4ec 179 if (g_user_interrupt_pending) {
<> 150:02e0a0aed4ec 180 /* If there was a user interrupt pending, set it now */
<> 150:02e0a0aed4ec 181 set_interrupt_to_user_value();
<> 150:02e0a0aed4ec 182
<> 150:02e0a0aed4ec 183 /* Reset the pending flag */
<> 150:02e0a0aed4ec 184 g_user_interrupt_pending = false;
<> 150:02e0a0aed4ec 185
<> 150:02e0a0aed4ec 186 /* This must have been a 32-bit overflow interrupt so
<> 150:02e0a0aed4ec 187 * increment the count */
<> 150:02e0a0aed4ec 188 g_overflow_count++;
<> 150:02e0a0aed4ec 189 g_last_32bit_overflow_value = g_next_32bit_overflow_value;
<> 150:02e0a0aed4ec 190 INCREMENT_MOD(g_next_32bit_overflow_value, MODULO_32BIT);
<> 150:02e0a0aed4ec 191 } else {
<> 150:02e0a0aed4ec 192 if (g_user_interrupt_set) {
<> 150:02e0a0aed4ec 193 /* It's a user interrupt, so wake from sleep but don't
<> 150:02e0a0aed4ec 194 * increment the overflow count as this is not an
<> 150:02e0a0aed4ec 195 * overflow interrupt */
<> 150:02e0a0aed4ec 196
<> 150:02e0a0aed4ec 197 /* Reset the user interrupt flag and call mbed */
<> 150:02e0a0aed4ec 198 g_user_interrupt_set = false;
<> 150:02e0a0aed4ec 199 lp_ticker_irq_handler();
<> 150:02e0a0aed4ec 200 } else {
<> 150:02e0a0aed4ec 201 /* Increment the count as this was a 32-bit overflow
<> 150:02e0a0aed4ec 202 * interrupt rather than a user interrupt */
<> 150:02e0a0aed4ec 203 g_overflow_count++;
<> 150:02e0a0aed4ec 204 g_last_32bit_overflow_value = g_next_32bit_overflow_value;
<> 150:02e0a0aed4ec 205 INCREMENT_MOD(g_next_32bit_overflow_value, MODULO_32BIT);
<> 150:02e0a0aed4ec 206 }
<> 150:02e0a0aed4ec 207
<> 150:02e0a0aed4ec 208 /* Set the next interrupt to be at the 32-bit overflow */
<> 150:02e0a0aed4ec 209 set_interrupt_to_32bit_overflow();
<> 150:02e0a0aed4ec 210 }
<> 150:02e0a0aed4ec 211 }
<> 150:02e0a0aed4ec 212
<> 150:02e0a0aed4ec 213 /* Clear the interrupt */
<> 150:02e0a0aed4ec 214 RTC_IRQ_CLR = 0xFFFFFFFF;
<> 150:02e0a0aed4ec 215 }
<> 150:02e0a0aed4ec 216
<> 150:02e0a0aed4ec 217 /* ----------------------------------------------------------------
<> 150:02e0a0aed4ec 218 * MBED API CALLS
<> 150:02e0a0aed4ec 219 * ----------------------------------------------------------------*/
<> 150:02e0a0aed4ec 220
<> 150:02e0a0aed4ec 221 /* This will be called once at start of day to get the RTC running */
<> 150:02e0a0aed4ec 222 void lp_ticker_init(void)
<> 150:02e0a0aed4ec 223 {
<> 150:02e0a0aed4ec 224 if (!g_initialised) {
<> 150:02e0a0aed4ec 225 /* Reset the overflow count and the flags */
<> 150:02e0a0aed4ec 226 g_overflow_count = 0;
<> 150:02e0a0aed4ec 227 g_user_interrupt_pending = false;
<> 150:02e0a0aed4ec 228 g_user_interrupt_set = false;
<> 150:02e0a0aed4ec 229
<> 150:02e0a0aed4ec 230 /* Setup the next natural 32-bit overflow value */
<> 150:02e0a0aed4ec 231 g_next_32bit_overflow_value = get_rtc_value();
<> 150:02e0a0aed4ec 232 g_last_32bit_overflow_value = g_next_32bit_overflow_value;
<> 150:02e0a0aed4ec 233 INCREMENT_MOD(g_next_32bit_overflow_value, MODULO_32BIT);
<> 150:02e0a0aed4ec 234
<> 150:02e0a0aed4ec 235 /* Clear the interrupt */
<> 150:02e0a0aed4ec 236 RTC_IRQ_CLR = 0xFFFFFFFF;
<> 150:02e0a0aed4ec 237
<> 150:02e0a0aed4ec 238 /* Interrupt at 32-bit overflow */
<> 150:02e0a0aed4ec 239 set_interrupt_to_32bit_overflow();
<> 150:02e0a0aed4ec 240
<> 150:02e0a0aed4ec 241 /* Enable the interrupt */
<> 150:02e0a0aed4ec 242 g_initialised = true;
<> 150:02e0a0aed4ec 243 NVIC_EnableIRQ(RTC_IRQn);
<> 150:02e0a0aed4ec 244 }
<> 150:02e0a0aed4ec 245 }
<> 150:02e0a0aed4ec 246
<> 150:02e0a0aed4ec 247 uint32_t lp_ticker_read(void)
<> 150:02e0a0aed4ec 248 {
<> 150:02e0a0aed4ec 249 uint64_t rtcNow;
<> 150:02e0a0aed4ec 250
<> 150:02e0a0aed4ec 251 /* Disable interrupts to avoid collisions */
<> 150:02e0a0aed4ec 252 core_util_critical_section_enter();
<> 150:02e0a0aed4ec 253
<> 150:02e0a0aed4ec 254 /* Just in case this is called before initialisation has been performed */
<> 150:02e0a0aed4ec 255 if (!g_initialised) {
<> 150:02e0a0aed4ec 256 lp_ticker_init();
<> 150:02e0a0aed4ec 257 }
<> 150:02e0a0aed4ec 258
<> 150:02e0a0aed4ec 259 /* What mbed expects here is a 32 bit timer value. There is no
<> 150:02e0a0aed4ec 260 * way to reset the RTC so, to pretend it is 32 bits, we have to
<> 150:02e0a0aed4ec 261 * maintain a 32-bit window on it using the remembered overflow
<> 150:02e0a0aed4ec 262 * value */
<> 150:02e0a0aed4ec 263 rtcNow = get_rtc_value();
<> 150:02e0a0aed4ec 264
<> 150:02e0a0aed4ec 265 /* Put interrupts back */
<> 150:02e0a0aed4ec 266 core_util_critical_section_exit();
<> 150:02e0a0aed4ec 267
<> 150:02e0a0aed4ec 268 return ticksToUSeconds(rtcNow - g_last_32bit_overflow_value);
<> 150:02e0a0aed4ec 269 }
<> 150:02e0a0aed4ec 270
<> 150:02e0a0aed4ec 271 void lp_ticker_set_interrupt(timestamp_t time)
<> 150:02e0a0aed4ec 272 {
<> 150:02e0a0aed4ec 273 uint32_t timeNow = get_rtc_value() - g_last_32bit_overflow_value;
<> 150:02e0a0aed4ec 274 uint32_t timeOffset = uSecondsToTicks(time) - timeNow;
<> 150:02e0a0aed4ec 275
<> 150:02e0a0aed4ec 276 /* Disable interrupts to avoid collisions */
<> 150:02e0a0aed4ec 277 core_util_critical_section_enter();
<> 150:02e0a0aed4ec 278
<> 150:02e0a0aed4ec 279 g_user_interrupt_pending = false;
<> 150:02e0a0aed4ec 280 g_user_interrupt_set = false;
<> 150:02e0a0aed4ec 281
<> 150:02e0a0aed4ec 282 /* Handle time slipping into the past */
<> 150:02e0a0aed4ec 283 if (timeOffset > 0xEFFFFFFF) {
<> 150:02e0a0aed4ec 284 timeOffset = 100;
<> 150:02e0a0aed4ec 285 }
<> 150:02e0a0aed4ec 286
<> 150:02e0a0aed4ec 287 /* Read the current time */
<> 150:02e0a0aed4ec 288 g_next_compare_value = get_rtc_value();
<> 150:02e0a0aed4ec 289
<> 150:02e0a0aed4ec 290 /* Add the offset */
<> 150:02e0a0aed4ec 291 INCREMENT_MOD(g_next_compare_value, timeOffset);
<> 150:02e0a0aed4ec 292
<> 150:02e0a0aed4ec 293 /* We must let the normal overflow interrupt occur as
<> 150:02e0a0aed4ec 294 * well as setting this interrupt so, if the value
<> 150:02e0a0aed4ec 295 * of 'time' would occur after the overflow point,
<> 150:02e0a0aed4ec 296 * put the change of compare-value off until afterwards. */
<> 150:02e0a0aed4ec 297 /* TODO: this needs proper testing. */
<> 150:02e0a0aed4ec 298 if (g_next_32bit_overflow_value > g_next_compare_value) {
<> 150:02e0a0aed4ec 299 /* The easy case, no overlap */
<> 150:02e0a0aed4ec 300 } else {
<> 150:02e0a0aed4ec 301 /* Could be because g_next_compare_value has wrapped (around the
<> 150:02e0a0aed4ec 302 * 48-bit limit of the RTC) */
<> 150:02e0a0aed4ec 303 if (g_next_32bit_overflow_value - g_next_compare_value >= MODULO_32BIT) {
<> 150:02e0a0aed4ec 304 /* The wrap case, we're OK */
<> 150:02e0a0aed4ec 305 } else {
<> 150:02e0a0aed4ec 306 /* There is an overlap, apply the value later */
<> 150:02e0a0aed4ec 307 g_user_interrupt_pending = true;
<> 150:02e0a0aed4ec 308
<> 150:02e0a0aed4ec 309 if (g_next_32bit_overflow_value == g_next_compare_value) {
<> 150:02e0a0aed4ec 310 /* If they are on top of each other, bump this
<> 150:02e0a0aed4ec 311 * one forward to avoid losing the interrupt */
<> 150:02e0a0aed4ec 312 INCREMENT_MOD(g_next_compare_value, 2);
<> 150:02e0a0aed4ec 313 }
<> 150:02e0a0aed4ec 314 }
<> 150:02e0a0aed4ec 315 }
<> 150:02e0a0aed4ec 316
<> 150:02e0a0aed4ec 317 if (!g_user_interrupt_pending) {
<> 150:02e0a0aed4ec 318 /* Make the change immediately */
<> 150:02e0a0aed4ec 319 set_interrupt_to_user_value();
<> 150:02e0a0aed4ec 320 }
<> 150:02e0a0aed4ec 321
<> 150:02e0a0aed4ec 322 /* Put interrupts back */
<> 150:02e0a0aed4ec 323 core_util_critical_section_exit();
<> 150:02e0a0aed4ec 324 }
<> 150:02e0a0aed4ec 325
AnnaBridge 174:b96e65c34a4d 326 void lp_ticker_fire_interrupt(void)
AnnaBridge 174:b96e65c34a4d 327 {
AnnaBridge 174:b96e65c34a4d 328 // user interrupt only set, this will invoke from ISR routine directly lp handler
AnnaBridge 174:b96e65c34a4d 329 g_user_interrupt_pending = false;
AnnaBridge 174:b96e65c34a4d 330 g_user_interrupt_set = true;
AnnaBridge 174:b96e65c34a4d 331 NVIC_SetPendingIRQ(RTC_IRQn);
AnnaBridge 174:b96e65c34a4d 332 }
AnnaBridge 174:b96e65c34a4d 333
<> 150:02e0a0aed4ec 334 void lp_ticker_disable_interrupt(void)
<> 150:02e0a0aed4ec 335 {
<> 150:02e0a0aed4ec 336 /* Can't disable interrupts as we need them to manage
<> 150:02e0a0aed4ec 337 * overflow. Instead, switch off the user part. */
<> 150:02e0a0aed4ec 338 g_user_interrupt_pending = false;
<> 150:02e0a0aed4ec 339 g_user_interrupt_set = false;
<> 150:02e0a0aed4ec 340 }
<> 150:02e0a0aed4ec 341
<> 150:02e0a0aed4ec 342 void lp_ticker_clear_interrupt(void)
<> 150:02e0a0aed4ec 343 {
<> 150:02e0a0aed4ec 344 /* Can't disable interrupts as we need them to manage
<> 150:02e0a0aed4ec 345 * overflow. Instead, switch off the user part. */
<> 150:02e0a0aed4ec 346 g_user_interrupt_pending = false;
<> 150:02e0a0aed4ec 347 g_user_interrupt_set = false;
<> 150:02e0a0aed4ec 348 }
AnnaBridge 188:bcfe06ba3d64 349
AnnaBridge 188:bcfe06ba3d64 350 void lp_ticker_free(void)
AnnaBridge 188:bcfe06ba3d64 351 {
AnnaBridge 188:bcfe06ba3d64 352
AnnaBridge 188:bcfe06ba3d64 353 }