Lee Kai Xuan / mbed-os

mbed-os

Fork of mbed-os by erkin yucel

targets/TARGET_STM/TARGET_STM32F0/lp_ticker.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

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elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2016, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "device.h"
elessair 0:f269e3021894 31
elessair 0:f269e3021894 32 #if DEVICE_LOWPOWERTIMER
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 #include "ticker_api.h"
elessair 0:f269e3021894 35 #include "lp_ticker_api.h"
elessair 0:f269e3021894 36 #include "rtc_api.h"
elessair 0:f269e3021894 37 #include "rtc_api_hal.h"
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 static uint8_t lp_ticker_inited = 0;
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 void lp_ticker_init(void)
elessair 0:f269e3021894 42 {
elessair 0:f269e3021894 43 if (lp_ticker_inited) return;
elessair 0:f269e3021894 44 lp_ticker_inited = 1;
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 rtc_init();
elessair 0:f269e3021894 47 rtc_set_irq_handler((uint32_t) lp_ticker_irq_handler);
elessair 0:f269e3021894 48 }
elessair 0:f269e3021894 49
elessair 0:f269e3021894 50 uint32_t lp_ticker_read(void)
elessair 0:f269e3021894 51 {
elessair 0:f269e3021894 52 uint32_t usecs;
elessair 0:f269e3021894 53 time_t time;
elessair 0:f269e3021894 54
elessair 0:f269e3021894 55 lp_ticker_init();
elessair 0:f269e3021894 56
elessair 0:f269e3021894 57 do {
elessair 0:f269e3021894 58 time = rtc_read();
elessair 0:f269e3021894 59 usecs = rtc_read_subseconds();
elessair 0:f269e3021894 60 } while (time != rtc_read());
elessair 0:f269e3021894 61
elessair 0:f269e3021894 62 return (time * 1000000) + usecs;
elessair 0:f269e3021894 63 }
elessair 0:f269e3021894 64
elessair 0:f269e3021894 65 void lp_ticker_set_interrupt(timestamp_t timestamp)
elessair 0:f269e3021894 66 {
elessair 0:f269e3021894 67 uint32_t delta;
elessair 0:f269e3021894 68
elessair 0:f269e3021894 69 delta = timestamp - lp_ticker_read();
elessair 0:f269e3021894 70 rtc_set_wake_up_timer(delta);
elessair 0:f269e3021894 71 }
elessair 0:f269e3021894 72
elessair 0:f269e3021894 73 void lp_ticker_disable_interrupt(void)
elessair 0:f269e3021894 74 {
elessair 0:f269e3021894 75 rtc_deactivate_wake_up_timer();
elessair 0:f269e3021894 76 }
elessair 0:f269e3021894 77
elessair 0:f269e3021894 78 void lp_ticker_clear_interrupt(void)
elessair 0:f269e3021894 79 {
elessair 0:f269e3021894 80
elessair 0:f269e3021894 81 }
elessair 0:f269e3021894 82
elessair 0:f269e3021894 83 #endif