Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/targets/TARGET_STM/lp_ticker.c@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

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marcozecchini 0:9fca2b23d0ba 1 /* mbed Microcontroller Library
marcozecchini 0:9fca2b23d0ba 2 *******************************************************************************
marcozecchini 0:9fca2b23d0ba 3 * Copyright (c) 2016, STMicroelectronics
marcozecchini 0:9fca2b23d0ba 4 * All rights reserved.
marcozecchini 0:9fca2b23d0ba 5 *
marcozecchini 0:9fca2b23d0ba 6 * Redistribution and use in source and binary forms, with or without
marcozecchini 0:9fca2b23d0ba 7 * modification, are permitted provided that the following conditions are met:
marcozecchini 0:9fca2b23d0ba 8 *
marcozecchini 0:9fca2b23d0ba 9 * 1. Redistributions of source code must retain the above copyright notice,
marcozecchini 0:9fca2b23d0ba 10 * this list of conditions and the following disclaimer.
marcozecchini 0:9fca2b23d0ba 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
marcozecchini 0:9fca2b23d0ba 12 * this list of conditions and the following disclaimer in the documentation
marcozecchini 0:9fca2b23d0ba 13 * and/or other materials provided with the distribution.
marcozecchini 0:9fca2b23d0ba 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
marcozecchini 0:9fca2b23d0ba 15 * may be used to endorse or promote products derived from this software
marcozecchini 0:9fca2b23d0ba 16 * without specific prior written permission.
marcozecchini 0:9fca2b23d0ba 17 *
marcozecchini 0:9fca2b23d0ba 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
marcozecchini 0:9fca2b23d0ba 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
marcozecchini 0:9fca2b23d0ba 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
marcozecchini 0:9fca2b23d0ba 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
marcozecchini 0:9fca2b23d0ba 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
marcozecchini 0:9fca2b23d0ba 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
marcozecchini 0:9fca2b23d0ba 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
marcozecchini 0:9fca2b23d0ba 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
marcozecchini 0:9fca2b23d0ba 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
marcozecchini 0:9fca2b23d0ba 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
marcozecchini 0:9fca2b23d0ba 28 *******************************************************************************
marcozecchini 0:9fca2b23d0ba 29 */
marcozecchini 0:9fca2b23d0ba 30 #include "device.h"
marcozecchini 0:9fca2b23d0ba 31
marcozecchini 0:9fca2b23d0ba 32 #if DEVICE_LOWPOWERTIMER
marcozecchini 0:9fca2b23d0ba 33
marcozecchini 0:9fca2b23d0ba 34 #include "ticker_api.h"
marcozecchini 0:9fca2b23d0ba 35 #include "lp_ticker_api.h"
marcozecchini 0:9fca2b23d0ba 36 #include "rtc_api.h"
marcozecchini 0:9fca2b23d0ba 37 #include "rtc_api_hal.h"
marcozecchini 0:9fca2b23d0ba 38
marcozecchini 0:9fca2b23d0ba 39 static uint8_t lp_ticker_inited = 0;
marcozecchini 0:9fca2b23d0ba 40
marcozecchini 0:9fca2b23d0ba 41 void lp_ticker_init(void)
marcozecchini 0:9fca2b23d0ba 42 {
marcozecchini 0:9fca2b23d0ba 43 if (lp_ticker_inited) return;
marcozecchini 0:9fca2b23d0ba 44 lp_ticker_inited = 1;
marcozecchini 0:9fca2b23d0ba 45
marcozecchini 0:9fca2b23d0ba 46 rtc_init();
marcozecchini 0:9fca2b23d0ba 47 rtc_set_irq_handler((uint32_t) lp_ticker_irq_handler);
marcozecchini 0:9fca2b23d0ba 48 }
marcozecchini 0:9fca2b23d0ba 49
marcozecchini 0:9fca2b23d0ba 50 uint32_t lp_ticker_read(void)
marcozecchini 0:9fca2b23d0ba 51 {
marcozecchini 0:9fca2b23d0ba 52 uint32_t usecs = 0;
marcozecchini 0:9fca2b23d0ba 53 time_t time = 0;
marcozecchini 0:9fca2b23d0ba 54
marcozecchini 0:9fca2b23d0ba 55 lp_ticker_init();
marcozecchini 0:9fca2b23d0ba 56
marcozecchini 0:9fca2b23d0ba 57 do {
marcozecchini 0:9fca2b23d0ba 58 time = rtc_read();
marcozecchini 0:9fca2b23d0ba 59 usecs = rtc_read_subseconds();
marcozecchini 0:9fca2b23d0ba 60 } while (time != rtc_read());
marcozecchini 0:9fca2b23d0ba 61
marcozecchini 0:9fca2b23d0ba 62 return (time * 1000000) + usecs;
marcozecchini 0:9fca2b23d0ba 63 }
marcozecchini 0:9fca2b23d0ba 64
marcozecchini 0:9fca2b23d0ba 65 void lp_ticker_set_interrupt(timestamp_t timestamp)
marcozecchini 0:9fca2b23d0ba 66 {
marcozecchini 0:9fca2b23d0ba 67 uint32_t delta;
marcozecchini 0:9fca2b23d0ba 68
marcozecchini 0:9fca2b23d0ba 69 delta = timestamp - lp_ticker_read();
marcozecchini 0:9fca2b23d0ba 70 rtc_set_wake_up_timer(delta);
marcozecchini 0:9fca2b23d0ba 71 }
marcozecchini 0:9fca2b23d0ba 72
marcozecchini 0:9fca2b23d0ba 73 void lp_ticker_fire_interrupt(void)
marcozecchini 0:9fca2b23d0ba 74 {
marcozecchini 0:9fca2b23d0ba 75 NVIC_SetPendingIRQ(RTC_WKUP_IRQn);
marcozecchini 0:9fca2b23d0ba 76 }
marcozecchini 0:9fca2b23d0ba 77
marcozecchini 0:9fca2b23d0ba 78 void lp_ticker_disable_interrupt(void)
marcozecchini 0:9fca2b23d0ba 79 {
marcozecchini 0:9fca2b23d0ba 80 rtc_deactivate_wake_up_timer();
marcozecchini 0:9fca2b23d0ba 81 }
marcozecchini 0:9fca2b23d0ba 82
marcozecchini 0:9fca2b23d0ba 83 void lp_ticker_clear_interrupt(void)
marcozecchini 0:9fca2b23d0ba 84 {
marcozecchini 0:9fca2b23d0ba 85
marcozecchini 0:9fca2b23d0ba 86 }
marcozecchini 0:9fca2b23d0ba 87
marcozecchini 0:9fca2b23d0ba 88 #endif