mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/rtc_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)
- Committer:
- shaoziyang
- Date:
- Sat Sep 13 14:25:46 2014 +0000
- Revision:
- 323:9e901b0a5aa1
- Parent:
- 215:83cf97a28428
test with CLOCK_SETUP = 0
Who changed what in which revision?
User | Revision | Line number | New 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 | 60:142c6c6f5949 | 40 | void rtc_init(void) { |
mbed_official | 174:8bb9f3a33240 | 41 | uint32_t StartUpCounter = 0; |
mbed_official | 174:8bb9f3a33240 | 42 | uint32_t LSEStatus = 0; |
mbed_official | 174:8bb9f3a33240 | 43 | uint32_t rtc_freq = 0; |
mbed_official | 174:8bb9f3a33240 | 44 | |
mbed_official | 60:142c6c6f5949 | 45 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE); // Enable PWR and Backup clock |
mbed_official | 60:142c6c6f5949 | 46 | |
mbed_official | 60:142c6c6f5949 | 47 | PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain |
mbed_official | 174:8bb9f3a33240 | 48 | |
mbed_official | 60:142c6c6f5949 | 49 | BKP_DeInit(); // Reset Backup Domain |
mbed_official | 174:8bb9f3a33240 | 50 | |
mbed_official | 174:8bb9f3a33240 | 51 | // Enable LSE clock |
mbed_official | 174:8bb9f3a33240 | 52 | RCC_LSEConfig(RCC_LSE_ON); |
mbed_official | 174:8bb9f3a33240 | 53 | |
mbed_official | 174:8bb9f3a33240 | 54 | // Wait till LSE is ready |
mbed_official | 174:8bb9f3a33240 | 55 | do { |
mbed_official | 174:8bb9f3a33240 | 56 | LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY); |
mbed_official | 174:8bb9f3a33240 | 57 | wait_ms(1); |
mbed_official | 174:8bb9f3a33240 | 58 | StartUpCounter++; |
mbed_official | 174:8bb9f3a33240 | 59 | } while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT)); |
mbed_official | 174:8bb9f3a33240 | 60 | |
mbed_official | 174:8bb9f3a33240 | 61 | if (StartUpCounter > LSE_STARTUP_TIMEOUT) { |
mbed_official | 174:8bb9f3a33240 | 62 | // The LSE has not started, use LSI instead. |
mbed_official | 174:8bb9f3a33240 | 63 | // The RTC Clock may vary due to LSI frequency dispersion. |
mbed_official | 174:8bb9f3a33240 | 64 | RCC_LSEConfig(RCC_LSE_OFF); |
mbed_official | 174:8bb9f3a33240 | 65 | RCC_LSICmd(ENABLE); // Enable LSI |
mbed_official | 174:8bb9f3a33240 | 66 | while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready |
mbed_official | 174:8bb9f3a33240 | 67 | RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source |
mbed_official | 174:8bb9f3a33240 | 68 | rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture |
mbed_official | 174:8bb9f3a33240 | 69 | } else { |
mbed_official | 174:8bb9f3a33240 | 70 | // The LSE has correctly started |
mbed_official | 174:8bb9f3a33240 | 71 | RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source |
mbed_official | 174:8bb9f3a33240 | 72 | rtc_freq = LSE_VALUE; |
mbed_official | 174:8bb9f3a33240 | 73 | } |
mbed_official | 174:8bb9f3a33240 | 74 | |
mbed_official | 174:8bb9f3a33240 | 75 | RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock |
mbed_official | 174:8bb9f3a33240 | 76 | |
mbed_official | 60:142c6c6f5949 | 77 | RTC_WaitForSynchro(); // Wait for RTC registers synchronization |
mbed_official | 174:8bb9f3a33240 | 78 | |
mbed_official | 60:142c6c6f5949 | 79 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 60:142c6c6f5949 | 80 | |
mbed_official | 60:142c6c6f5949 | 81 | // Set RTC period to 1 sec |
mbed_official | 174:8bb9f3a33240 | 82 | RTC_SetPrescaler(rtc_freq - 1); |
mbed_official | 174:8bb9f3a33240 | 83 | |
mbed_official | 60:142c6c6f5949 | 84 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 174:8bb9f3a33240 | 85 | |
mbed_official | 60:142c6c6f5949 | 86 | rtc_inited = 1; |
mbed_official | 60:142c6c6f5949 | 87 | } |
mbed_official | 60:142c6c6f5949 | 88 | |
mbed_official | 60:142c6c6f5949 | 89 | void rtc_free(void) { |
mbed_official | 215:83cf97a28428 | 90 | // Disable RTC, LSE and LSI clocks |
mbed_official | 215:83cf97a28428 | 91 | PWR_BackupAccessCmd(ENABLE); // Allow access to Backup Domain |
mbed_official | 215:83cf97a28428 | 92 | RCC_RTCCLKCmd(DISABLE); |
mbed_official | 215:83cf97a28428 | 93 | RCC_LSEConfig(RCC_LSE_OFF); |
mbed_official | 215:83cf97a28428 | 94 | RCC_LSICmd(DISABLE); |
mbed_official | 215:83cf97a28428 | 95 | |
mbed_official | 60:142c6c6f5949 | 96 | rtc_inited = 0; |
mbed_official | 60:142c6c6f5949 | 97 | } |
mbed_official | 60:142c6c6f5949 | 98 | |
mbed_official | 60:142c6c6f5949 | 99 | int rtc_isenabled(void) { |
mbed_official | 60:142c6c6f5949 | 100 | return rtc_inited; |
mbed_official | 60:142c6c6f5949 | 101 | } |
mbed_official | 60:142c6c6f5949 | 102 | |
mbed_official | 60:142c6c6f5949 | 103 | time_t rtc_read(void) { |
mbed_official | 60:142c6c6f5949 | 104 | return (time_t)RTC_GetCounter(); |
mbed_official | 60:142c6c6f5949 | 105 | } |
mbed_official | 60:142c6c6f5949 | 106 | |
mbed_official | 60:142c6c6f5949 | 107 | void rtc_write(time_t t) { |
mbed_official | 60:142c6c6f5949 | 108 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 60:142c6c6f5949 | 109 | RTC_SetCounter(t); // Change the current time |
mbed_official | 60:142c6c6f5949 | 110 | RTC_WaitForLastTask(); // Wait until last write operation on RTC registers has finished |
mbed_official | 60:142c6c6f5949 | 111 | } |
mbed_official | 174:8bb9f3a33240 | 112 | |
mbed_official | 174:8bb9f3a33240 | 113 | #endif |