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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c@440:8a0b45cd594f, 2014-12-16 (annotated)

Committer:
mbed_official
Date:
Tue Dec 16 08:15:08 2014 +0000
Revision:
440:8a0b45cd594f
Parent:
402:09075a3b15e3
Child:
489:119543c9f674
Synchronized with git revision 67fbbf0b635d0c0d93fbe433306c537c2ad206aa



Full URL: https://github.com/mbedmicro/mbed/commit/67fbbf0b635d0c0d93fbe433306c537c2ad206aa/



Targets: nrf51 - updating app_timer.c from Norid'c SDKv7.1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 60:142c6c6f5949 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 *******************************************************************************
mbed_official 70:c1fbde68b492 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 4 * All rights reserved.
mbed_official 60:142c6c6f5949 5 *
mbed_official 70:c1fbde68b492 6 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 7 * modification, are permitted provided that the following conditions are met:
mbed_official 60:142c6c6f5949 8 *
mbed_official 70:c1fbde68b492 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 10 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 13 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 15 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 16 * without specific prior written permission.
mbed_official 60:142c6c6f5949 17 *
mbed_official 70:c1fbde68b492 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 70:c1fbde68b492 28 *******************************************************************************
mbed_official 60:142c6c6f5949 29 */
mbed_official 60:142c6c6f5949 30 #include "rtc_api.h"
mbed_official 60:142c6c6f5949 31
mbed_official 174:8bb9f3a33240 32 #if DEVICE_RTC
mbed_official 174:8bb9f3a33240 33
mbed_official 174:8bb9f3a33240 34 #include "wait_api.h"
mbed_official 174:8bb9f3a33240 35
mbed_official 174:8bb9f3a33240 36 #define LSE_STARTUP_TIMEOUT ((uint16_t)700) // delay in ms
mbed_official 174:8bb9f3a33240 37
mbed_official 60:142c6c6f5949 38 static int rtc_inited = 0;
mbed_official 60:142c6c6f5949 39
mbed_official 402:09075a3b15e3 40 void rtc_init(void)
mbed_official 402:09075a3b15e3 41 {
mbed_official 174:8bb9f3a33240 42 uint32_t StartUpCounter = 0;
mbed_official 174:8bb9f3a33240 43 uint32_t LSEStatus = 0;
mbed_official 174:8bb9f3a33240 44 uint32_t rtc_freq = 0;
mbed_official 174:8bb9f3a33240 45
mbed_official 60:142c6c6f5949 46 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE); // Enable PWR and Backup clock
mbed_official 60:142c6c6f5949 47
mbed_official 60:142c6c6f5949 48 PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain
mbed_official 174:8bb9f3a33240 49
mbed_official 60:142c6c6f5949 50 BKP_DeInit(); // Reset Backup Domain
mbed_official 174:8bb9f3a33240 51
mbed_official 174:8bb9f3a33240 52 // Enable LSE clock
mbed_official 174:8bb9f3a33240 53 RCC_LSEConfig(RCC_LSE_ON);
mbed_official 174:8bb9f3a33240 54
mbed_official 174:8bb9f3a33240 55 // Wait till LSE is ready
mbed_official 174:8bb9f3a33240 56 do {
mbed_official 174:8bb9f3a33240 57 LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY);
mbed_official 174:8bb9f3a33240 58 wait_ms(1);
mbed_official 174:8bb9f3a33240 59 StartUpCounter++;
mbed_official 174:8bb9f3a33240 60 } while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT));
mbed_official 174:8bb9f3a33240 61
mbed_official 174:8bb9f3a33240 62 if (StartUpCounter > LSE_STARTUP_TIMEOUT) {
mbed_official 174:8bb9f3a33240 63 // The LSE has not started, use LSI instead.
mbed_official 174:8bb9f3a33240 64 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 174:8bb9f3a33240 65 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 174:8bb9f3a33240 66 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 174:8bb9f3a33240 67 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 174:8bb9f3a33240 68 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source
mbed_official 174:8bb9f3a33240 69 rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture
mbed_official 174:8bb9f3a33240 70 } else {
mbed_official 174:8bb9f3a33240 71 // The LSE has correctly started
mbed_official 174:8bb9f3a33240 72 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source
mbed_official 174:8bb9f3a33240 73 rtc_freq = LSE_VALUE;
mbed_official 174:8bb9f3a33240 74 }
mbed_official 174:8bb9f3a33240 75
mbed_official 174:8bb9f3a33240 76 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 174:8bb9f3a33240 77
mbed_official 60:142c6c6f5949 78 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 174:8bb9f3a33240 79
mbed_official 60:142c6c6f5949 80 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 60:142c6c6f5949 81
mbed_official 60:142c6c6f5949 82 // Set RTC period to 1 sec
mbed_official 174:8bb9f3a33240 83 RTC_SetPrescaler(rtc_freq - 1);
mbed_official 174:8bb9f3a33240 84
mbed_official 60:142c6c6f5949 85 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 174:8bb9f3a33240 86
mbed_official 60:142c6c6f5949 87 rtc_inited = 1;
mbed_official 60:142c6c6f5949 88 }
mbed_official 60:142c6c6f5949 89
mbed_official 402:09075a3b15e3 90 void rtc_free(void)
mbed_official 402:09075a3b15e3 91 {
mbed_official 215:83cf97a28428 92 // Disable RTC, LSE and LSI clocks
mbed_official 215:83cf97a28428 93 PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain
mbed_official 215:83cf97a28428 94 RCC_RTCCLKCmd(DISABLE);
mbed_official 215:83cf97a28428 95 RCC_LSEConfig(RCC_LSE_OFF);
mbed_official 215:83cf97a28428 96 RCC_LSICmd(DISABLE);
mbed_official 215:83cf97a28428 97
mbed_official 60:142c6c6f5949 98 rtc_inited = 0;
mbed_official 60:142c6c6f5949 99 }
mbed_official 60:142c6c6f5949 100
mbed_official 402:09075a3b15e3 101 int rtc_isenabled(void)
mbed_official 402:09075a3b15e3 102 {
mbed_official 60:142c6c6f5949 103 return rtc_inited;
mbed_official 60:142c6c6f5949 104 }
mbed_official 60:142c6c6f5949 105
mbed_official 402:09075a3b15e3 106 time_t rtc_read(void)
mbed_official 402:09075a3b15e3 107 {
mbed_official 60:142c6c6f5949 108 return (time_t)RTC_GetCounter();
mbed_official 60:142c6c6f5949 109 }
mbed_official 60:142c6c6f5949 110
mbed_official 402:09075a3b15e3 111 void rtc_write(time_t t)
mbed_official 402:09075a3b15e3 112 {
mbed_official 60:142c6c6f5949 113 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 60:142c6c6f5949 114 RTC_SetCounter(t); // Change the current time
mbed_official 60:142c6c6f5949 115 RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished
mbed_official 60:142c6c6f5949 116 }
mbed_official 174:8bb9f3a33240 117
mbed_official 174:8bb9f3a33240 118 #endif