siva surendar / mbed-dev

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

targets/hal/TARGET_STM/TARGET_STM32F0/lp_ticker.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
Child:
148:21d94c44109e
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2016, STMicroelectronics
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "device.h"
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 #if DEVICE_LOWPOWERTIMER
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 #include "ticker_api.h"
<> 144:ef7eb2e8f9f7 35 #include "lp_ticker_api.h"
<> 144:ef7eb2e8f9f7 36 #include "rtc_api.h"
<> 144:ef7eb2e8f9f7 37 #include "rtc_api_hal.h"
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 static uint8_t lp_ticker_inited = 0;
<> 144:ef7eb2e8f9f7 40 static uint8_t lp_ticker_reconf_presc = 0;
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 void lp_ticker_init() {
<> 144:ef7eb2e8f9f7 43 if (lp_ticker_inited) return;
<> 144:ef7eb2e8f9f7 44 lp_ticker_inited = 1;
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 rtc_init();
<> 144:ef7eb2e8f9f7 47 rtc_set_irq_handler((uint32_t) lp_ticker_irq_handler);
<> 144:ef7eb2e8f9f7 48 }
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 uint32_t lp_ticker_read() {
<> 144:ef7eb2e8f9f7 51 uint32_t sub_secs, milis;
<> 144:ef7eb2e8f9f7 52 time_t time;
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 lp_ticker_init();
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 time = rtc_read();
<> 144:ef7eb2e8f9f7 57 sub_secs = rtc_read_subseconds();
<> 144:ef7eb2e8f9f7 58 milis = 1000 - (sub_secs * 1000 / rtc_ticker_get_synch_presc());
<> 144:ef7eb2e8f9f7 59
<> 144:ef7eb2e8f9f7 60 return (time * 1000000) + (milis * 1000);
<> 144:ef7eb2e8f9f7 61 }
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 void lp_ticker_set_interrupt(timestamp_t timestamp) {
<> 144:ef7eb2e8f9f7 64 uint32_t sub_secs, delta, milis;
<> 144:ef7eb2e8f9f7 65 time_t secs;
<> 144:ef7eb2e8f9f7 66 struct tm *timeinfo;
<> 144:ef7eb2e8f9f7 67
<> 144:ef7eb2e8f9f7 68 // Reconfigure RTC prescalers whenever the timestamp is below 30ms
<> 144:ef7eb2e8f9f7 69 if (!lp_ticker_reconf_presc && timestamp < 30000) {
<> 144:ef7eb2e8f9f7 70 rtc_reconfigure_prescalers();
<> 144:ef7eb2e8f9f7 71 lp_ticker_reconf_presc = 1;
<> 144:ef7eb2e8f9f7 72 }
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 milis = (timestamp % 1000000) / 1000;
<> 144:ef7eb2e8f9f7 75
<> 144:ef7eb2e8f9f7 76 secs = rtc_read();
<> 144:ef7eb2e8f9f7 77 delta = ((timestamp / 1000000) - secs);
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 secs += delta;
<> 144:ef7eb2e8f9f7 80 sub_secs = (rtc_ticker_get_synch_presc() * (1000 - milis)) / 1000;
<> 144:ef7eb2e8f9f7 81 timeinfo = localtime(&secs);
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 rtc_set_alarm(timeinfo, sub_secs);
<> 144:ef7eb2e8f9f7 84 }
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 void lp_ticker_disable_interrupt() {
<> 144:ef7eb2e8f9f7 87 lp_ticker_reconf_presc = 0;
<> 144:ef7eb2e8f9f7 88 rtc_ticker_disable_irq();
<> 144:ef7eb2e8f9f7 89 }
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 void lp_ticker_clear_interrupt() {
<> 144:ef7eb2e8f9f7 92 }
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 #endif