mbed library sources
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targets/hal/TARGET_STM/TARGET_DISCO_F100RB/rtc_api.c@445:9a3ffe6cfa19, 2015-01-14 (annotated)
- Committer:
- moirans2
- Date:
- Wed Jan 14 20:53:08 2015 +0000
- Revision:
- 445:9a3ffe6cfa19
- Parent:
- 126:549ba18ddd81
internal clock stm32L051
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 126:549ba18ddd81 | 1 | /* mbed Microcontroller Library |
mbed_official | 126:549ba18ddd81 | 2 | ******************************************************************************* |
mbed_official | 126:549ba18ddd81 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 126:549ba18ddd81 | 4 | * All rights reserved. |
mbed_official | 126:549ba18ddd81 | 5 | * |
mbed_official | 126:549ba18ddd81 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 126:549ba18ddd81 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 126:549ba18ddd81 | 8 | * |
mbed_official | 126:549ba18ddd81 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 126:549ba18ddd81 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 126:549ba18ddd81 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 126:549ba18ddd81 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 126:549ba18ddd81 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 126:549ba18ddd81 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 126:549ba18ddd81 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 126:549ba18ddd81 | 16 | * without specific prior written permission. |
mbed_official | 126:549ba18ddd81 | 17 | * |
mbed_official | 126:549ba18ddd81 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 126:549ba18ddd81 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 126:549ba18ddd81 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 126:549ba18ddd81 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 126:549ba18ddd81 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 126:549ba18ddd81 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 126:549ba18ddd81 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 126:549ba18ddd81 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 126:549ba18ddd81 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 126:549ba18ddd81 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 126:549ba18ddd81 | 28 | ******************************************************************************* |
mbed_official | 126:549ba18ddd81 | 29 | */ |
mbed_official | 126:549ba18ddd81 | 30 | #include "rtc_api.h" |
mbed_official | 126:549ba18ddd81 | 31 | |
mbed_official | 126:549ba18ddd81 | 32 | static int rtc_inited = 0; |
mbed_official | 126:549ba18ddd81 | 33 | |
mbed_official | 126:549ba18ddd81 | 34 | void rtc_init(void) { |
mbed_official | 126:549ba18ddd81 | 35 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE); // Enable PWR and Backup clock |
mbed_official | 126:549ba18ddd81 | 36 | |
mbed_official | 126:549ba18ddd81 | 37 | PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain |
mbed_official | 126:549ba18ddd81 | 38 | |
mbed_official | 126:549ba18ddd81 | 39 | BKP_DeInit(); // Reset Backup Domain |
mbed_official | 126:549ba18ddd81 | 40 | |
mbed_official | 126:549ba18ddd81 | 41 | // Uncomment these lines if you use the LSE |
mbed_official | 126:549ba18ddd81 | 42 | // Enable LSE and wait till it's ready |
mbed_official | 126:549ba18ddd81 | 43 | //RCC_LSEConfig(RCC_LSE_ON); |
mbed_official | 126:549ba18ddd81 | 44 | //while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) {} |
mbed_official | 126:549ba18ddd81 | 45 | //RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select LSE as RTC Clock Source |
mbed_official | 126:549ba18ddd81 | 46 | |
mbed_official | 126:549ba18ddd81 | 47 | // Uncomment these lines if you use the LSI |
mbed_official | 126:549ba18ddd81 | 48 | // Enable LSI and wait till it's ready |
mbed_official | 126:549ba18ddd81 | 49 | RCC_LSICmd(ENABLE); |
mbed_official | 126:549ba18ddd81 | 50 | while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} |
mbed_official | 126:549ba18ddd81 | 51 | RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source |
mbed_official | 126:549ba18ddd81 | 52 | |
mbed_official | 126:549ba18ddd81 | 53 | RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock |
mbed_official | 126:549ba18ddd81 | 54 | |
mbed_official | 126:549ba18ddd81 | 55 | RTC_WaitForSynchro(); // Wait for RTC registers synchronization |
mbed_official | 126:549ba18ddd81 | 56 | |
mbed_official | 126:549ba18ddd81 | 57 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 126:549ba18ddd81 | 58 | |
mbed_official | 126:549ba18ddd81 | 59 | // Set RTC period to 1 sec |
mbed_official | 126:549ba18ddd81 | 60 | // For LSE: prescaler = RTCCLK/RTC period = 32768Hz/1Hz = 32768 |
mbed_official | 126:549ba18ddd81 | 61 | // For LSI: prescaler = RTCCLK/RTC period = 40000Hz/1Hz = 40000 |
mbed_official | 126:549ba18ddd81 | 62 | RTC_SetPrescaler(39999); |
mbed_official | 126:549ba18ddd81 | 63 | |
mbed_official | 126:549ba18ddd81 | 64 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 126:549ba18ddd81 | 65 | |
mbed_official | 126:549ba18ddd81 | 66 | rtc_inited = 1; |
mbed_official | 126:549ba18ddd81 | 67 | } |
mbed_official | 126:549ba18ddd81 | 68 | |
mbed_official | 126:549ba18ddd81 | 69 | void rtc_free(void) { |
mbed_official | 126:549ba18ddd81 | 70 | RCC_DeInit(); // Resets the RCC clock configuration to the default reset state |
mbed_official | 126:549ba18ddd81 | 71 | rtc_inited = 0; |
mbed_official | 126:549ba18ddd81 | 72 | } |
mbed_official | 126:549ba18ddd81 | 73 | |
mbed_official | 126:549ba18ddd81 | 74 | int rtc_isenabled(void) { |
mbed_official | 126:549ba18ddd81 | 75 | return rtc_inited; |
mbed_official | 126:549ba18ddd81 | 76 | } |
mbed_official | 126:549ba18ddd81 | 77 | |
mbed_official | 126:549ba18ddd81 | 78 | time_t rtc_read(void) { |
mbed_official | 126:549ba18ddd81 | 79 | return (time_t)RTC_GetCounter(); |
mbed_official | 126:549ba18ddd81 | 80 | } |
mbed_official | 126:549ba18ddd81 | 81 | |
mbed_official | 126:549ba18ddd81 | 82 | void rtc_write(time_t t) { |
mbed_official | 126:549ba18ddd81 | 83 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 126:549ba18ddd81 | 84 | RTC_SetCounter(t); // Change the current time |
mbed_official | 126:549ba18ddd81 | 85 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 126:549ba18ddd81 | 86 | } |