Iftikhar Aziz / mbed-dev

4545

Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

targets/TARGET_STM/lp_ticker.c@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
154:37f96f9d4de2 
r1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 154:37f96f9d4de2 1 /* mbed Microcontroller Library
<> 154:37f96f9d4de2 2 *******************************************************************************
<> 154:37f96f9d4de2 3 * Copyright (c) 2016, STMicroelectronics
<> 154:37f96f9d4de2 4 * All rights reserved.
<> 154:37f96f9d4de2 5 *
<> 154:37f96f9d4de2 6 * Redistribution and use in source and binary forms, with or without
<> 154:37f96f9d4de2 7 * modification, are permitted provided that the following conditions are met:
<> 154:37f96f9d4de2 8 *
<> 154:37f96f9d4de2 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 154:37f96f9d4de2 10 * this list of conditions and the following disclaimer.
<> 154:37f96f9d4de2 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 154:37f96f9d4de2 12 * this list of conditions and the following disclaimer in the documentation
<> 154:37f96f9d4de2 13 * and/or other materials provided with the distribution.
<> 154:37f96f9d4de2 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 154:37f96f9d4de2 15 * may be used to endorse or promote products derived from this software
<> 154:37f96f9d4de2 16 * without specific prior written permission.
<> 154:37f96f9d4de2 17 *
<> 154:37f96f9d4de2 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 154:37f96f9d4de2 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 154:37f96f9d4de2 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 154:37f96f9d4de2 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 154:37f96f9d4de2 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 154:37f96f9d4de2 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 154:37f96f9d4de2 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 154:37f96f9d4de2 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 154:37f96f9d4de2 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 154:37f96f9d4de2 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 154:37f96f9d4de2 28 *******************************************************************************
<> 154:37f96f9d4de2 29 */
<> 154:37f96f9d4de2 30 #include "device.h"
<> 154:37f96f9d4de2 31
<> 154:37f96f9d4de2 32 #if DEVICE_LOWPOWERTIMER
<> 154:37f96f9d4de2 33
<> 154:37f96f9d4de2 34 #include "ticker_api.h"
<> 154:37f96f9d4de2 35 #include "lp_ticker_api.h"
<> 154:37f96f9d4de2 36 #include "rtc_api.h"
<> 154:37f96f9d4de2 37 #include "rtc_api_hal.h"
<> 154:37f96f9d4de2 38
<> 154:37f96f9d4de2 39 static uint8_t lp_ticker_inited = 0;
<> 154:37f96f9d4de2 40
<> 154:37f96f9d4de2 41 void lp_ticker_init(void)
<> 154:37f96f9d4de2 42 {
<> 154:37f96f9d4de2 43 if (lp_ticker_inited) return;
<> 154:37f96f9d4de2 44 lp_ticker_inited = 1;
<> 154:37f96f9d4de2 45
<> 154:37f96f9d4de2 46 rtc_init();
<> 154:37f96f9d4de2 47 rtc_set_irq_handler((uint32_t) lp_ticker_irq_handler);
<> 154:37f96f9d4de2 48 }
<> 154:37f96f9d4de2 49
<> 154:37f96f9d4de2 50 uint32_t lp_ticker_read(void)
<> 154:37f96f9d4de2 51 {
<> 154:37f96f9d4de2 52 uint32_t usecs = 0;
<> 154:37f96f9d4de2 53 time_t time = 0;
<> 154:37f96f9d4de2 54
<> 154:37f96f9d4de2 55 lp_ticker_init();
<> 154:37f96f9d4de2 56
<> 154:37f96f9d4de2 57 do {
<> 154:37f96f9d4de2 58 time = rtc_read();
<> 154:37f96f9d4de2 59 usecs = rtc_read_subseconds();
<> 154:37f96f9d4de2 60 } while (time != rtc_read());
<> 154:37f96f9d4de2 61
<> 154:37f96f9d4de2 62 return (time * 1000000) + usecs;
<> 154:37f96f9d4de2 63 }
<> 154:37f96f9d4de2 64
<> 154:37f96f9d4de2 65 void lp_ticker_set_interrupt(timestamp_t timestamp)
<> 154:37f96f9d4de2 66 {
<> 154:37f96f9d4de2 67 uint32_t delta;
<> 154:37f96f9d4de2 68
<> 154:37f96f9d4de2 69 delta = timestamp - lp_ticker_read();
<> 154:37f96f9d4de2 70 rtc_set_wake_up_timer(delta);
<> 154:37f96f9d4de2 71 }
<> 154:37f96f9d4de2 72
<> 154:37f96f9d4de2 73 void lp_ticker_disable_interrupt(void)
<> 154:37f96f9d4de2 74 {
<> 154:37f96f9d4de2 75 rtc_deactivate_wake_up_timer();
<> 154:37f96f9d4de2 76 }
<> 154:37f96f9d4de2 77
<> 154:37f96f9d4de2 78 void lp_ticker_clear_interrupt(void)
<> 154:37f96f9d4de2 79 {
<> 154:37f96f9d4de2 80
<> 154:37f96f9d4de2 81 }
<> 154:37f96f9d4de2 82
<> 154:37f96f9d4de2 83 #endif