Peter Drescher / mbed-F401

mbed library with additional peripherals for ST F401 board

Fork of mbed-src by mbed official

This mbed LIB has additional peripherals for ST F401 board

  • UART2 : PA_3 rx, PA_2 tx
  • UART3 : PC_7 rx, PC_6 tx
  • I2C2 : PB_3 SDA, PB_10 SCL
  • I2C3 : PB_4 SDA, PA_8 SCL

targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/rtc_api.c@76:aeb1df146756, 2014-01-27 (annotated)

Committer:
mbed_official
Date:
Mon Jan 27 14:30:07 2014 +0000
Revision:
76:aeb1df146756
Synchronized with git revision a31ec9c5f7bcb5c8a1b2eced103f6a1dfa921abd



Full URL: https://github.com/mbedmicro/mbed/commit/a31ec9c5f7bcb5c8a1b2eced103f6a1dfa921abd/



Add NUCLEO_L152RE

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "rtc_api.h"
mbed_official 76:aeb1df146756 31
mbed_official 76:aeb1df146756 32 static int rtc_inited = 0;
mbed_official 76:aeb1df146756 33
mbed_official 76:aeb1df146756 34 void rtc_init(void) {
mbed_official 76:aeb1df146756 35 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // Enable PWR clock
mbed_official 76:aeb1df146756 36
mbed_official 76:aeb1df146756 37 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 76:aeb1df146756 38
mbed_official 76:aeb1df146756 39 // Note: the LSI is used as RTC source clock
mbed_official 76:aeb1df146756 40 // The RTC Clock may vary due to LSI frequency dispersion.
mbed_official 76:aeb1df146756 41
mbed_official 76:aeb1df146756 42 RCC_LSICmd(ENABLE); // Enable LSI
mbed_official 76:aeb1df146756 43
mbed_official 76:aeb1df146756 44 while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {} // Wait until ready
mbed_official 76:aeb1df146756 45
mbed_official 76:aeb1df146756 46 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); // Select LSI as RTC Clock Source
mbed_official 76:aeb1df146756 47
mbed_official 76:aeb1df146756 48 RCC_RTCCLKCmd(ENABLE); // Enable RTC Clock
mbed_official 76:aeb1df146756 49
mbed_official 76:aeb1df146756 50 RTC_WaitForSynchro(); // Wait for RTC registers synchronization
mbed_official 76:aeb1df146756 51
mbed_official 76:aeb1df146756 52 uint32_t lsi_freq = 40000; // *** TODO** To be measured precisely using a timer input capture
mbed_official 76:aeb1df146756 53
mbed_official 76:aeb1df146756 54 RTC_InitTypeDef RTC_InitStructure;
mbed_official 76:aeb1df146756 55 RTC_InitStructure.RTC_AsynchPrediv = 127;
mbed_official 76:aeb1df146756 56 RTC_InitStructure.RTC_SynchPrediv = (lsi_freq / 128) - 1;
mbed_official 76:aeb1df146756 57 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
mbed_official 76:aeb1df146756 58 RTC_Init(&RTC_InitStructure);
mbed_official 76:aeb1df146756 59
mbed_official 76:aeb1df146756 60 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 76:aeb1df146756 61
mbed_official 76:aeb1df146756 62 rtc_inited = 1;
mbed_official 76:aeb1df146756 63 }
mbed_official 76:aeb1df146756 64
mbed_official 76:aeb1df146756 65 void rtc_free(void) {
mbed_official 76:aeb1df146756 66 RCC_DeInit(); // Resets the RCC clock configuration to the default reset state
mbed_official 76:aeb1df146756 67 rtc_inited = 0;
mbed_official 76:aeb1df146756 68 }
mbed_official 76:aeb1df146756 69
mbed_official 76:aeb1df146756 70 int rtc_isenabled(void) {
mbed_official 76:aeb1df146756 71 return rtc_inited;
mbed_official 76:aeb1df146756 72 }
mbed_official 76:aeb1df146756 73
mbed_official 76:aeb1df146756 74 /*
mbed_official 76:aeb1df146756 75 RTC Registers
mbed_official 76:aeb1df146756 76 RTC_WeekDay 1=monday, 2=tuesday, ..., 7=sunday
mbed_official 76:aeb1df146756 77 RTC_Month 1=january, 2=february, ..., 12=december
mbed_official 76:aeb1df146756 78 RTC_Date day of the month 1-31
mbed_official 76:aeb1df146756 79 RTC_Year year 0-99
mbed_official 76:aeb1df146756 80 struct tm
mbed_official 76:aeb1df146756 81 tm_sec seconds after the minute 0-61
mbed_official 76:aeb1df146756 82 tm_min minutes after the hour 0-59
mbed_official 76:aeb1df146756 83 tm_hour hours since midnight 0-23
mbed_official 76:aeb1df146756 84 tm_mday day of the month 1-31
mbed_official 76:aeb1df146756 85 tm_mon months since January 0-11
mbed_official 76:aeb1df146756 86 tm_year years since 1900
mbed_official 76:aeb1df146756 87 tm_wday days since Sunday 0-6
mbed_official 76:aeb1df146756 88 tm_yday days since January 1 0-365
mbed_official 76:aeb1df146756 89 tm_isdst Daylight Saving Time flag
mbed_official 76:aeb1df146756 90 */
mbed_official 76:aeb1df146756 91 time_t rtc_read(void) {
mbed_official 76:aeb1df146756 92 RTC_DateTypeDef dateStruct;
mbed_official 76:aeb1df146756 93 RTC_TimeTypeDef timeStruct;
mbed_official 76:aeb1df146756 94 struct tm timeinfo;
mbed_official 76:aeb1df146756 95
mbed_official 76:aeb1df146756 96 // Read actual date and time
mbed_official 76:aeb1df146756 97 RTC_GetTime(RTC_Format_BIN, &timeStruct);
mbed_official 76:aeb1df146756 98 RTC_GetDate(RTC_Format_BIN, &dateStruct);
mbed_official 76:aeb1df146756 99
mbed_official 76:aeb1df146756 100 // Setup a tm structure based on the RTC
mbed_official 76:aeb1df146756 101 timeinfo.tm_wday = dateStruct.RTC_WeekDay;
mbed_official 76:aeb1df146756 102 timeinfo.tm_mon = dateStruct.RTC_Month - 1;
mbed_official 76:aeb1df146756 103 timeinfo.tm_mday = dateStruct.RTC_Date;
mbed_official 76:aeb1df146756 104 timeinfo.tm_year = dateStruct.RTC_Year + 100;
mbed_official 76:aeb1df146756 105 timeinfo.tm_hour = timeStruct.RTC_Hours;
mbed_official 76:aeb1df146756 106 timeinfo.tm_min = timeStruct.RTC_Minutes;
mbed_official 76:aeb1df146756 107 timeinfo.tm_sec = timeStruct.RTC_Seconds;
mbed_official 76:aeb1df146756 108
mbed_official 76:aeb1df146756 109 // Convert to timestamp
mbed_official 76:aeb1df146756 110 time_t t = mktime(&timeinfo);
mbed_official 76:aeb1df146756 111
mbed_official 76:aeb1df146756 112 return t;
mbed_official 76:aeb1df146756 113 }
mbed_official 76:aeb1df146756 114
mbed_official 76:aeb1df146756 115 void rtc_write(time_t t) {
mbed_official 76:aeb1df146756 116 RTC_DateTypeDef dateStruct;
mbed_official 76:aeb1df146756 117 RTC_TimeTypeDef timeStruct;
mbed_official 76:aeb1df146756 118
mbed_official 76:aeb1df146756 119 // Convert the time into a tm
mbed_official 76:aeb1df146756 120 struct tm *timeinfo = localtime(&t);
mbed_official 76:aeb1df146756 121
mbed_official 76:aeb1df146756 122 // Fill RTC structures
mbed_official 76:aeb1df146756 123 dateStruct.RTC_WeekDay = timeinfo->tm_wday;
mbed_official 76:aeb1df146756 124 dateStruct.RTC_Month = timeinfo->tm_mon + 1;
mbed_official 76:aeb1df146756 125 dateStruct.RTC_Date = timeinfo->tm_mday;
mbed_official 76:aeb1df146756 126 dateStruct.RTC_Year = timeinfo->tm_year - 100;
mbed_official 76:aeb1df146756 127 timeStruct.RTC_Hours = timeinfo->tm_hour;
mbed_official 76:aeb1df146756 128 timeStruct.RTC_Minutes = timeinfo->tm_min;
mbed_official 76:aeb1df146756 129 timeStruct.RTC_Seconds = timeinfo->tm_sec;
mbed_official 76:aeb1df146756 130 timeStruct.RTC_H12 = RTC_HourFormat_24;
mbed_official 76:aeb1df146756 131
mbed_official 76:aeb1df146756 132 // Change the RTC current date/time
mbed_official 76:aeb1df146756 133 PWR_BackupAccessCmd(ENABLE); // Enable access to RTC
mbed_official 76:aeb1df146756 134 RTC_SetDate(RTC_Format_BIN, &dateStruct);
mbed_official 76:aeb1df146756 135 RTC_SetTime(RTC_Format_BIN, &timeStruct);
mbed_official 76:aeb1df146756 136 PWR_BackupAccessCmd(DISABLE); // Disable access to RTC
mbed_official 76:aeb1df146756 137 }