stm32l1xx_rtc.c

ucos2.86在STM32L152DISCOVERY上的移植

/**
  ******************************************************************************
  * @file    stm32l1xx_rtc.c
  * @author  MCD Application Team
  * @version V1.1.0
  * @date    24-January-2012
  * @brief   This file provides firmware functions to manage the following 
  *          functionalities of the Real-Time Clock (RTC) peripheral:
  *           + Initialization
  *           + Calendar (Time and Date) configuration
  *           + Alarms (Alarm A and Alarm B) configuration
  *           + WakeUp Timer configuration
  *           + Daylight Saving configuration
  *           + Output pin Configuration
  *           + Coarse digital Calibration configuration
  *           + Smooth digital Calibration configuration
  *           + TimeStamp configuration
  *           + Tampers configuration
  *           + Backup Data Registers configuration
  *           + Output Type Config configuration
  *           + Shift control synchronisation  
  *           + Interrupts and flags management       
  *                     
 @verbatim

 ===============================================================================
                        ##### RTC Domain Reset #####
 ===============================================================================
    [..] After power-on reset, the RTC domain (RTC clock source configuration,
         RTC registers and RTC Backup data registers) is reset. You can also
         reset this domain by software using the RCC_RTCResetCmd() function.

                    ##### RTC Operating Condition #####
 ===============================================================================
    [..] As long as the supply voltage remains in the operating range, 
         the RTC never stops, regardless of the device status (Run mode, 
         low power modes or under reset).

                       ##### RTC Domain Access #####
 ===============================================================================
    [..] After reset, the RTC domain (RTC clock source configuration,
         RTC registers and RTC Backup data registers) are protected against 
         possible stray write accesses. 
    [..] To enable access to the RTC Domain and RTC registers, proceed as follows:
         (+) Enable the Power Controller (PWR) APB1 interface clock using the
             RCC_APB1PeriphClockCmd() function.
         (+) Enable access to RTC domain using the PWR_RTCAccessCmd() function.
         (+) Select the RTC clock source using the RCC_RTCCLKConfig() function.
         (+) Enable RTC Clock using the RCC_RTCCLKCmd() function.

                     ##### How to use this driver #####
 ===============================================================================
    [..]
        (+) Enable the RTC domain access (see description in the section above)
        (+) Configure the RTC Prescaler (Asynchronous and Synchronous) and
            RTC hour format using the RTC_Init() function.
 ***Time and Date configuration ***
 ==================================
    [..]
        (+) To configure the RTC Calendar (Time and Date) use the RTC_SetTime()
            and RTC_SetDate() functions.
        (+) To read the RTC Calendar, use the RTC_GetTime() and RTC_GetDate()
            functions.
        (+) To read the RTC subsecond, use the RTC_GetSubSecond() function.
        (+) Use the RTC_DayLightSavingConfig() function to add or sub one
            hour to the RTC Calendar.    

 ***Alarm configuration ***
 ==========================
    [..]
        (+) To configure the RTC Alarm use the RTC_SetAlarm() function.
        (+) Enable the selected RTC Alarm using the RTC_AlarmCmd() function
        (+) To read the RTC Alarm, use the RTC_GetAlarm() function.
        (+) To read the RTC alarm SubSecond, use the RTC_GetAlarmSubSecond() function.

 ***RTC Wakeup configuration ***
 ===============================
    [..]
        (+) Configure the RTC Wakeup Clock source use the RTC_WakeUpClockConfig()
            function.
        (+) Configure the RTC WakeUp Counter using the RTC_SetWakeUpCounter() 
            function.
        (+) Enable the RTC WakeUp using the RTC_WakeUpCmd() function  
        (+) To read the RTC WakeUp Counter register, use the RTC_GetWakeUpCounter() 
            function.

 ***Outputs configuration ***
 ============================
    [..] The RTC has 2 different outputs:
        (+) AFO_ALARM: this output is used to manage the RTC Alarm A, Alarm B
            and WaKeUp signals.
            To output the selected RTC signal on RTC_AF1 pin, use the 
            RTC_OutputConfig() function.
        (+) AFO_CALIB: this output is 512Hz signal or 1Hz.
            To output the RTC Clock on RTC_AF1 pin, use the RTC_CalibOutputCmd()
            function.

 ***Smooth digital Calibration configuration ***
 ===============================================
    [..]
        (+) Configure the RTC Original Digital Calibration Value and the corresponding
            calibration cycle period (32s,16s and 8s) using the RTC_SmoothCalibConfig() 
            function.

 ***Coarse digital Calibration configuration ***
 ===============================================
    [..]
        (+) Configure the RTC Coarse Calibration Value and the corresponding
            sign using the RTC_CoarseCalibConfig() function.
        (+) Enable the RTC Coarse Calibration using the RTC_CoarseCalibCmd() 
            function.

 ***TimeStamp configuration ***
 ==============================
    [..]
        (+) Configure the RTC_AF1 trigger and enables the RTC TimeStamp 
            using the RTC_TimeStampCmd() function.
        (+) To read the RTC TimeStamp Time and Date register, use the 
            RTC_GetTimeStamp() function.
        (+) To read the RTC TimeStamp SubSecond register, use the 
            RTC_GetTimeStampSubSecond() function.

 ***Tamper configuration ***
 ===========================
    [..]
        (+) Configure the Tamper filter count using RTC_TamperFilterConfig()
            function. 
        (+) Configure the RTC Tamper trigger Edge or Level according to the Tamper 
            filter (if equal to 0 Edge else Level) value using the RTC_TamperConfig() 
            function.
        (+) Configure the Tamper sampling frequency using RTC_TamperSamplingFreqConfig()
            function.
        (+) Configure the Tamper precharge or discharge duration using 
            RTC_TamperPinsPrechargeDuration() function.
        (+) Enable the Tamper Pull-UP using RTC_TamperPullUpDisableCmd() function.
        (+) Enable the RTC Tamper using the RTC_TamperCmd() function.
        (+) Enable the Time stamp on Tamper detection event using  
            RTC_TSOnTamperDetecCmd() function.     

 ***Backup Data Registers configuration ***
 ==========================================
    [..]
        (+) To write to the RTC Backup Data registers, use the RTC_WriteBackupRegister()
            function.  
        (+) To read the RTC Backup Data registers, use the RTC_ReadBackupRegister()
            function.  

                       ##### RTC and low power modes #####
 ===============================================================================
    [..] The MCU can be woken up from a low power mode by an RTC alternate 
         function.
    [..] The RTC alternate functions are the RTC alarms (Alarm A and Alarm B), 
         RTC wakeup, RTC tamper event detection and RTC time stamp event detection.
         These RTC alternate functions can wake up the system from the Stop 
         and Standby lowpower modes.
         The system can also wake up from low power modes without depending 
         on an external interrupt (Auto-wakeup mode), by using the RTC alarm 
         or the RTC wakeup events.
    [..] The RTC provides a programmable time base for waking up from the 
         Stop or Standby mode at regular intervals.
         Wakeup from STOP and Standby modes is possible only when the RTC 
         clock source is LSE or LSI.

               ##### Selection of RTC_AF1 alternate functions #####
 ===============================================================================
    [..] The RTC_AF1 pin (PC13) can be used for the following purposes:
         (+) Wakeup pin 2 (WKUP2) using the PWR_WakeUpPinCmd() function.
         (+) AFO_ALARM output.
         (+) AFO_CALIB output.
         (+) AFI_TAMPER.
         (+) AFI_TIMESTAMP.

   +------------------------------------------------------------------------------------------+
   |     Pin         |AFO_ALARM |AFO_CALIB |AFI_TAMPER |AFI_TIMESTAMP | WKUP2  |ALARMOUTTYPE  |
   |  configuration  | ENABLED  | ENABLED  |  ENABLED  |   ENABLED    |ENABLED |  AFO_ALARM   |
   |  and function   |          |          |           |              |        |Configuration |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   |   Alarm out     |          |          |           |              | Don't  |              |
   |   output OD     |     1    |    0     |Don't care | Don't care   | care   |      0       |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   |   Alarm out     |          |          |           |              | Don't  |              |
   |   output PP     |     1    |    0     |Don't care | Don't care   | care   |      1       |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   | Calibration out |          |          |           |              | Don't  |              |
   |   output PP     |     0    |    1     |Don't care | Don't care   | care   |  Don't care  |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   |  TAMPER input   |          |          |           |              | Don't  |              |
   |   floating      |     0    |    0     |     1     |      0       | care   |  Don't care  |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   |  TIMESTAMP and  |          |          |           |              | Don't  |              |
   |  TAMPER input   |     0    |    0     |     1     |      1       | care   |  Don't care  |
   |   floating      |          |          |           |              |        |              |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   | TIMESTAMP input |          |          |           |              | Don't  |              |
   |    floating     |     0    |    0     |     0     |      1       | care   |  Don't care  |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   |  Wakeup Pin 2   |     0    |    0     |     0     |      0       |   1    |  Don't care  |
   |-----------------|----------|----------|-----------|--------------|--------|--------------|
   |  Standard GPIO  |     0    |    0     |     0     |      0       |   0    |  Don't care  |
   +------------------------------------------------------------------------------------------+

 @endverbatim
  
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * FOR MORE INFORMATION PLEASE READ CAREFULLY THE LICENSE AGREEMENT FILE
  * LOCATED IN THE ROOT DIRECTORY OF THIS FIRMWARE PACKAGE.
  *
  * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l1xx_rtc.h"
#include "stm32l1xx_rcc.h"

/** @addtogroup STM32L1xx_StdPeriph_Driver
  * @{
  */

/** @defgroup RTC 
  * @brief RTC driver modules
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/

/* Masks Definition */
#define RTC_TR_RESERVED_MASK    ((uint32_t)0x007F7F7F)
#define RTC_DR_RESERVED_MASK    ((uint32_t)0x00FFFF3F) 
#define RTC_INIT_MASK           ((uint32_t)0xFFFFFFFF)  
#define RTC_RSF_MASK            ((uint32_t)0xFFFFFF5F)
#define RTC_FLAGS_MASK          ((uint32_t)(RTC_FLAG_TSOVF | RTC_FLAG_TSF | RTC_FLAG_WUTF | \
                                            RTC_FLAG_ALRBF | RTC_FLAG_ALRAF | RTC_FLAG_INITF | \
                                            RTC_FLAG_RSF | RTC_FLAG_INITS | RTC_FLAG_WUTWF | \
                                            RTC_FLAG_ALRBWF | RTC_FLAG_ALRAWF | RTC_FLAG_TAMP1F | \
                                            RTC_FLAG_TAMP2F | RTC_FLAG_TAMP3F | RTC_FLAG_RECALPF | \
                                            RTC_FLAG_SHPF))

#define INITMODE_TIMEOUT         ((uint32_t) 0x00002000)
#define SYNCHRO_TIMEOUT          ((uint32_t) 0x00008000)
#define RECALPF_TIMEOUT          ((uint32_t) 0x00001000)
#define SHPF_TIMEOUT             ((uint32_t) 0x00002000)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static uint8_t RTC_ByteToBcd2(uint8_t Value);
static uint8_t RTC_Bcd2ToByte(uint8_t Value);

/* Private functions ---------------------------------------------------------*/

/** @defgroup RTC_Private_Functions
  * @{
  */ 

/** @defgroup RTC_Group1 Initialization and Configuration functions
 *  @brief   Initialization and Configuration functions 
 *
@verbatim
 ===============================================================================
            ##### Initialization and Configuration functions #####
 ===============================================================================
    [..] This section provide functions allowing to initialize and configure the 
         RTC Prescaler (Synchronous and Asynchronous), RTC Hour format, disable 
         RTC registers Write protection, enter and exit the RTC initialization mode, 
         RTC registers synchronization check and reference clock detection enable.
         (#) The RTC Prescaler is programmed to generate the RTC 1Hz time base. 
             It is split into 2 programmable prescalers to minimize power consumption.
             (++) A 7-bit asynchronous prescaler and A 13-bit synchronous prescaler.
             (++) When both prescalers are used, it is recommended to configure the 
                 asynchronous prescaler to a high value to minimize consumption.
         (#) All RTC registers are Write protected. Writing to the RTC registers
             is enabled by writing a key into the Write Protection register, RTC_WPR.
         (#) To Configure the RTC Calendar, user application should enter 
             initialization mode. In this mode, the calendar counter is stopped 
             and its value can be updated. When the initialization sequence is 
             complete, the calendar restarts counting after 4 RTCCLK cycles.
         (#) To read the calendar through the shadow registers after Calendar 
             initialization, calendar update or after wakeup from low power modes 
             the software must first clear the RSF flag. The software must then 
             wait until it is set again before reading the calendar, which means 
             that the calendar registers have been correctly copied into the 
             RTC_TR and RTC_DR shadow registers.The RTC_WaitForSynchro() function 
             implements the above software sequence (RSF clear and RSF check).

@endverbatim
  * @{
  */

/**
  * @brief  Deinitializes the RTC registers to their default reset values.
  * @note   This function doesn't reset the RTC Clock source and RTC Backup Data
  *         registers.       
  * @param  None
  * @retval An ErrorStatus enumeration value:
  *          - SUCCESS: RTC registers are deinitialized
  *          - ERROR: RTC registers are not deinitialized
  */
ErrorStatus RTC_DeInit(void)
{
  __IO uint32_t wutcounter = 0x00;
  uint32_t wutwfstatus = 0x00;
  ErrorStatus status = ERROR;
  
  /* Disable the write protection for RTC registers */
  RTC->WPR = 0xCA;
  RTC->WPR = 0x53;

  /* Set Initialization mode */
  if (RTC_EnterInitMode() == ERROR)
  {
    status = ERROR;
  }  
  else
  {
    /* Reset TR, DR and CR registers */
    RTC->TR = (uint32_t)0x00000000;
    RTC->DR = (uint32_t)0x00002101;
    
    /* Reset All CR bits except CR[2:0] */
    RTC->CR &= (uint32_t)0x00000007;
  
    /* Wait till RTC WUTWF flag is set and if Time out is reached exit */
    do
    {
      wutwfstatus = RTC->ISR & RTC_ISR_WUTWF;
      wutcounter++;  
    } while((wutcounter != INITMODE_TIMEOUT) && (wutwfstatus == 0x00));
    
    if ((RTC->ISR & RTC_ISR_WUTWF) == RESET)
    {
      status = ERROR;
    }
    else
    {
      /* Reset all RTC CR register bits */
      RTC->CR        &= (uint32_t)0x00000000;
      RTC->WUTR      = (uint32_t)0x0000FFFF;
      RTC->PRER      = (uint32_t)0x007F00FF;
      RTC->CALIBR    = (uint32_t)0x00000000;
      RTC->ALRMAR    = (uint32_t)0x00000000;
      RTC->ALRMBR    = (uint32_t)0x00000000;