mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_DISCO_F051R8/rtc_api.c@240:9a7c54113eaf, 2014-06-26 (annotated)
- Committer:
- mbed_official
- Date:
- Thu Jun 26 09:45:08 2014 +0100
- Revision:
- 240:9a7c54113eaf
- Parent:
- 130:1dec54e4aec3
Synchronized with git revision 288cce7281f1f4bd5ab515fff36cdf6090bc4480
Full URL: https://github.com/mbedmicro/mbed/commit/288cce7281f1f4bd5ab515fff36cdf6090bc4480/
[DISCO-F051R8] Updated with F030R8 recent changes
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 130:1dec54e4aec3 | 1 | /* mbed Microcontroller Library |
mbed_official | 130:1dec54e4aec3 | 2 | ******************************************************************************* |
mbed_official | 130:1dec54e4aec3 | 3 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 130:1dec54e4aec3 | 4 | * All rights reserved. |
mbed_official | 130:1dec54e4aec3 | 5 | * |
mbed_official | 130:1dec54e4aec3 | 6 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 130:1dec54e4aec3 | 7 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 130:1dec54e4aec3 | 8 | * |
mbed_official | 130:1dec54e4aec3 | 9 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 130:1dec54e4aec3 | 10 | * this list of conditions and the following disclaimer. |
mbed_official | 130:1dec54e4aec3 | 11 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 130:1dec54e4aec3 | 12 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 130:1dec54e4aec3 | 13 | * and/or other materials provided with the distribution. |
mbed_official | 130:1dec54e4aec3 | 14 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 130:1dec54e4aec3 | 15 | * may be used to endorse or promote products derived from this software |
mbed_official | 130:1dec54e4aec3 | 16 | * without specific prior written permission. |
mbed_official | 130:1dec54e4aec3 | 17 | * |
mbed_official | 130:1dec54e4aec3 | 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 130:1dec54e4aec3 | 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 130:1dec54e4aec3 | 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 130:1dec54e4aec3 | 21 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 130:1dec54e4aec3 | 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 130:1dec54e4aec3 | 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 130:1dec54e4aec3 | 24 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 130:1dec54e4aec3 | 25 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 130:1dec54e4aec3 | 26 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 130:1dec54e4aec3 | 27 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 130:1dec54e4aec3 | 28 | ******************************************************************************* |
mbed_official | 130:1dec54e4aec3 | 29 | */ |
mbed_official | 130:1dec54e4aec3 | 30 | #include "rtc_api.h" |
mbed_official | 130:1dec54e4aec3 | 31 | |
mbed_official | 240:9a7c54113eaf | 32 | #if DEVICE_RTC |
mbed_official | 240:9a7c54113eaf | 33 | |
mbed_official | 240:9a7c54113eaf | 34 | #include "wait_api.h" |
mbed_official | 240:9a7c54113eaf | 35 | |
mbed_official | 240:9a7c54113eaf | 36 | #define LSE_STARTUP_TIMEOUT ((uint16_t)500) // delay in ms |
mbed_official | 240:9a7c54113eaf | 37 | |
mbed_official | 130:1dec54e4aec3 | 38 | static int rtc_inited = 0; |
mbed_official | 130:1dec54e4aec3 | 39 | |
mbed_official | 130:1dec54e4aec3 | 40 | void rtc_init(void) { |
mbed_official | 240:9a7c54113eaf | 41 | uint32_t StartUpCounter = 0; |
mbed_official | 240:9a7c54113eaf | 42 | uint32_t LSEStatus = 0; |
mbed_official | 240:9a7c54113eaf | 43 | uint32_t rtc_freq = 0; |
mbed_official | 240:9a7c54113eaf | 44 | |
mbed_official | 130:1dec54e4aec3 | 45 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock |
mbed_official | 130:1dec54e4aec3 | 46 | |
mbed_official | 240:9a7c54113eaf | 47 | PWR_BackupAccessCmd(ENABLE); // Enable access to Backup domain |
mbed_official | 240:9a7c54113eaf | 48 | |
mbed_official | 240:9a7c54113eaf | 49 | // Reset back up registers |
mbed_official | 240:9a7c54113eaf | 50 | RCC_BackupResetCmd(ENABLE); |
mbed_official | 240:9a7c54113eaf | 51 | RCC_BackupResetCmd(DISABLE); |
mbed_official | 130:1dec54e4aec3 | 52 | |
mbed_official | 240:9a7c54113eaf | 53 | // Enable LSE clock |
mbed_official | 240:9a7c54113eaf | 54 | RCC_LSEConfig(RCC_LSE_ON); |
mbed_official | 240:9a7c54113eaf | 55 | |
mbed_official | 240:9a7c54113eaf | 56 | // Wait till LSE is ready |
mbed_official | 240:9a7c54113eaf | 57 | do { |
mbed_official | 240:9a7c54113eaf | 58 | LSEStatus = RCC_GetFlagStatus(RCC_FLAG_LSERDY); |
mbed_official | 240:9a7c54113eaf | 59 | wait_ms(1); |
mbed_official | 240:9a7c54113eaf | 60 | StartUpCounter++; |
mbed_official | 240:9a7c54113eaf | 61 | } while ((LSEStatus == 0) && (StartUpCounter <= LSE_STARTUP_TIMEOUT)); |
mbed_official | 130:1dec54e4aec3 | 62 | |
mbed_official | 240:9a7c54113eaf | 63 | if (StartUpCounter > LSE_STARTUP_TIMEOUT) { |
mbed_official | 240:9a7c54113eaf | 64 | // The LSE has not started, use LSI instead. |
mbed_official | 240:9a7c54113eaf | 65 | // The RTC Clock may vary due to LSI frequency dispersion. |
mbed_official | 240:9a7c54113eaf | 66 | RCC_LSEConfig(RCC_LSE_OFF); |
mbed_official | 130:1dec54e4aec3 | 67 | RCC_LSICmd(ENABLE); // Enable LSI |
mbed_official | 130:1dec54e4aec3 | 68 | while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready |
mbed_official | 240:9a7c54113eaf | 69 | RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select the RTC Clock Source |
mbed_official | 240:9a7c54113eaf | 70 | rtc_freq = 40000; // [TODO] To be measured precisely using a timer input capture |
mbed_official | 240:9a7c54113eaf | 71 | } else { |
mbed_official | 240:9a7c54113eaf | 72 | // The LSE has correctly started |
mbed_official | 240:9a7c54113eaf | 73 | RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // Select the RTC Clock Source |
mbed_official | 240:9a7c54113eaf | 74 | rtc_freq = LSE_VALUE; |
mbed_official | 240:9a7c54113eaf | 75 | } |
mbed_official | 130:1dec54e4aec3 | 76 | |
mbed_official | 130:1dec54e4aec3 | 77 | RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock |
mbed_official | 130:1dec54e4aec3 | 78 | |
mbed_official | 130:1dec54e4aec3 | 79 | RTC_WaitForSynchro(); // Wait for RTC registers synchronization |
mbed_official | 130:1dec54e4aec3 | 80 | |
mbed_official | 130:1dec54e4aec3 | 81 | RTC_InitTypeDef RTC_InitStructure; |
mbed_official | 130:1dec54e4aec3 | 82 | RTC_InitStructure.RTC_AsynchPrediv = 127; |
mbed_official | 240:9a7c54113eaf | 83 | RTC_InitStructure.RTC_SynchPrediv = (rtc_freq / 128) - 1; |
mbed_official | 130:1dec54e4aec3 | 84 | RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24; |
mbed_official | 130:1dec54e4aec3 | 85 | RTC_Init(&RTC_InitStructure); |
mbed_official | 130:1dec54e4aec3 | 86 | |
mbed_official | 240:9a7c54113eaf | 87 | PWR_BackupAccessCmd(DISABLE); // Disable access to Backup domain |
mbed_official | 130:1dec54e4aec3 | 88 | |
mbed_official | 130:1dec54e4aec3 | 89 | rtc_inited = 1; |
mbed_official | 130:1dec54e4aec3 | 90 | } |
mbed_official | 130:1dec54e4aec3 | 91 | |
mbed_official | 130:1dec54e4aec3 | 92 | void rtc_free(void) { |
mbed_official | 240:9a7c54113eaf | 93 | // Reset RTC |
mbed_official | 240:9a7c54113eaf | 94 | PWR_BackupAccessCmd(ENABLE); // Enable access to Backup Domain |
mbed_official | 240:9a7c54113eaf | 95 | RTC_DeInit(); |
mbed_official | 240:9a7c54113eaf | 96 | RCC_BackupResetCmd(ENABLE); |
mbed_official | 240:9a7c54113eaf | 97 | RCC_BackupResetCmd(DISABLE); |
mbed_official | 240:9a7c54113eaf | 98 | // Disable RTC, LSE and LSI clocks |
mbed_official | 240:9a7c54113eaf | 99 | RCC_RTCCLKCmd(DISABLE); |
mbed_official | 240:9a7c54113eaf | 100 | RCC_LSEConfig(RCC_LSE_OFF); |
mbed_official | 240:9a7c54113eaf | 101 | RCC_LSICmd(DISABLE); |
mbed_official | 240:9a7c54113eaf | 102 | |
mbed_official | 130:1dec54e4aec3 | 103 | rtc_inited = 0; |
mbed_official | 130:1dec54e4aec3 | 104 | } |
mbed_official | 130:1dec54e4aec3 | 105 | |
mbed_official | 130:1dec54e4aec3 | 106 | int rtc_isenabled(void) { |
mbed_official | 130:1dec54e4aec3 | 107 | return rtc_inited; |
mbed_official | 130:1dec54e4aec3 | 108 | } |
mbed_official | 130:1dec54e4aec3 | 109 | |
mbed_official | 130:1dec54e4aec3 | 110 | /* |
mbed_official | 130:1dec54e4aec3 | 111 | RTC Registers |
mbed_official | 130:1dec54e4aec3 | 112 | RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday |
mbed_official | 130:1dec54e4aec3 | 113 | RTC_Month 1=january, 2=february, ..., 12=december |
mbed_official | 130:1dec54e4aec3 | 114 | RTC_Date day of the month 1-31 |
mbed_official | 130:1dec54e4aec3 | 115 | RTC_Year year 0-99 |
mbed_official | 130:1dec54e4aec3 | 116 | struct tm |
mbed_official | 130:1dec54e4aec3 | 117 | tm_sec seconds after the minute 0-61 |
mbed_official | 130:1dec54e4aec3 | 118 | tm_min minutes after the hour 0-59 |
mbed_official | 130:1dec54e4aec3 | 119 | tm_hour hours since midnight 0-23 |
mbed_official | 130:1dec54e4aec3 | 120 | tm_mday day of the month 1-31 |
mbed_official | 130:1dec54e4aec3 | 121 | tm_mon months since January 0-11 |
mbed_official | 130:1dec54e4aec3 | 122 | tm_year years since 1900 |
mbed_official | 130:1dec54e4aec3 | 123 | tm_wday days since Sunday 0-6 |
mbed_official | 130:1dec54e4aec3 | 124 | tm_yday days since January 1 0-365 |
mbed_official | 130:1dec54e4aec3 | 125 | tm_isdst Daylight Saving Time flag |
mbed_official | 130:1dec54e4aec3 | 126 | */ |
mbed_official | 130:1dec54e4aec3 | 127 | time_t rtc_read(void) { |
mbed_official | 130:1dec54e4aec3 | 128 | RTC_DateTypeDef dateStruct; |
mbed_official | 130:1dec54e4aec3 | 129 | RTC_TimeTypeDef timeStruct; |
mbed_official | 130:1dec54e4aec3 | 130 | struct tm timeinfo; |
mbed_official | 130:1dec54e4aec3 | 131 | |
mbed_official | 130:1dec54e4aec3 | 132 | // Read actual date and time |
mbed_official | 130:1dec54e4aec3 | 133 | RTC_GetTime(RTC_Format_BIN, &timeStruct); |
mbed_official | 130:1dec54e4aec3 | 134 | RTC_GetDate(RTC_Format_BIN, &dateStruct); |
mbed_official | 130:1dec54e4aec3 | 135 | |
mbed_official | 130:1dec54e4aec3 | 136 | // Setup a tm structure based on the RTC |
mbed_official | 130:1dec54e4aec3 | 137 | timeinfo.tm_wday = dateStruct.RTC_WeekDay; |
mbed_official | 130:1dec54e4aec3 | 138 | timeinfo.tm_mon = dateStruct.RTC_Month - 1; |
mbed_official | 130:1dec54e4aec3 | 139 | timeinfo.tm_mday = dateStruct.RTC_Date; |
mbed_official | 130:1dec54e4aec3 | 140 | timeinfo.tm_year = dateStruct.RTC_Year + 100; |
mbed_official | 130:1dec54e4aec3 | 141 | timeinfo.tm_hour = timeStruct.RTC_Hours; |
mbed_official | 130:1dec54e4aec3 | 142 | timeinfo.tm_min = timeStruct.RTC_Minutes; |
mbed_official | 130:1dec54e4aec3 | 143 | timeinfo.tm_sec = timeStruct.RTC_Seconds; |
mbed_official | 130:1dec54e4aec3 | 144 | |
mbed_official | 130:1dec54e4aec3 | 145 | // Convert to timestamp |
mbed_official | 130:1dec54e4aec3 | 146 | time_t t = mktime(&timeinfo); |
mbed_official | 130:1dec54e4aec3 | 147 | |
mbed_official | 130:1dec54e4aec3 | 148 | return t; |
mbed_official | 130:1dec54e4aec3 | 149 | } |
mbed_official | 130:1dec54e4aec3 | 150 | |
mbed_official | 130:1dec54e4aec3 | 151 | void rtc_write(time_t t) { |
mbed_official | 130:1dec54e4aec3 | 152 | RTC_DateTypeDef dateStruct; |
mbed_official | 130:1dec54e4aec3 | 153 | RTC_TimeTypeDef timeStruct; |
mbed_official | 130:1dec54e4aec3 | 154 | |
mbed_official | 130:1dec54e4aec3 | 155 | // Convert the time into a tm |
mbed_official | 130:1dec54e4aec3 | 156 | struct tm *timeinfo = localtime(&t); |
mbed_official | 130:1dec54e4aec3 | 157 | |
mbed_official | 130:1dec54e4aec3 | 158 | // Fill RTC structures |
mbed_official | 130:1dec54e4aec3 | 159 | dateStruct.RTC_WeekDay = timeinfo->tm_wday; |
mbed_official | 130:1dec54e4aec3 | 160 | dateStruct.RTC_Month = timeinfo->tm_mon + 1; |
mbed_official | 130:1dec54e4aec3 | 161 | dateStruct.RTC_Date = timeinfo->tm_mday; |
mbed_official | 130:1dec54e4aec3 | 162 | dateStruct.RTC_Year = timeinfo->tm_year - 100; |
mbed_official | 130:1dec54e4aec3 | 163 | timeStruct.RTC_Hours = timeinfo->tm_hour; |
mbed_official | 130:1dec54e4aec3 | 164 | timeStruct.RTC_Minutes = timeinfo->tm_min; |
mbed_official | 130:1dec54e4aec3 | 165 | timeStruct.RTC_Seconds = timeinfo->tm_sec; |
mbed_official | 130:1dec54e4aec3 | 166 | timeStruct.RTC_H12 = RTC_HourFormat_24; |
mbed_official | 130:1dec54e4aec3 | 167 | |
mbed_official | 130:1dec54e4aec3 | 168 | // Change the RTC current date/time |
mbed_official | 130:1dec54e4aec3 | 169 | PWR_BackupAccessCmd(ENABLE); // Enable access to RTC |
mbed_official | 130:1dec54e4aec3 | 170 | RTC_SetDate(RTC_Format_BIN, &dateStruct); |
mbed_official | 130:1dec54e4aec3 | 171 | RTC_SetTime(RTC_Format_BIN, &timeStruct); |
mbed_official | 130:1dec54e4aec3 | 172 | PWR_BackupAccessCmd(DISABLE); // Disable access to RTC |
mbed_official | 130:1dec54e4aec3 | 173 | } |
mbed_official | 240:9a7c54113eaf | 174 | |
mbed_official | 240:9a7c54113eaf | 175 | #endif |