lowpower.c

stm32.rar

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : lowpower.c
* Author             : MCD Application Team
* Version            : V1.1.1
* Date               : 06/13/2008
* Description        : This file includes the low power driver for the 
*                      STM3210E-EVAL demonstration.
********************************************************************************
* 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.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static vu32 STOPModeStatus = 0;
static u32 GPIOA_CRL = 0, GPIOA_CRH = 0, GPIOB_CRL = 0, GPIOB_CRH = 0,
           GPIOC_CRL = 0, GPIOC_CRH = 0, GPIOD_CRL = 0, GPIOD_CRH = 0,
           GPIOE_CRL = 0, GPIOE_CRH = 0, GPIOF_CRL = 0, GPIOF_CRH = 0,
           GPIOG_CRL = 0, GPIOG_CRH = 0;
/* Private function prototypes -----------------------------------------------*/
static void GPIO_SaveConfig(void);
static void GPIO_RestoreConfig(void);

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

/*******************************************************************************
* Function Name  : LowPower_Init
* Description    : Initializes Low Power application. 
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void LowPower_Init(void)
{
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

  /* Enable WakeUp pin */
  PWR_WakeUpPinCmd(ENABLE);

  /* Enable Clock Security System(CSS) */
  RCC_ClockSecuritySystemCmd(ENABLE);
}

/*******************************************************************************
* Function Name  : SYSCLKConfig_STOP
* Description    : Configures system clock after wake-up from STOP: enable HSE, PLL
*                  and select PLL as system clock source.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SYSCLKConfig_STOP(void)
{
  ErrorStatus HSEStartUpStatus;

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();

  if(HSEStartUpStatus == SUCCESS)
  {
    /* Enable PLL */ 
    RCC_PLLCmd(ENABLE);

    /* Wait till PLL is ready */
    while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
    {
    }

    /* Select PLL as system clock source */
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

    /* Wait till PLL is used as system clock source */
    while(RCC_GetSYSCLKSource() != 0x08)
    {
    }
  }
}

/*******************************************************************************
* Function Name  : EnterSTOPMode_EXTI
* Description    : Enters MCU in STOP mode. The wake-up from STOP mode is 
*                  performed by an external interrupt.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void EnterSTOPMode_EXTI(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
  
  STOPModeStatus = 0;

  /* Clear the LCD */
  LCD_Clear(White);
  
  /* Set the LCD Back Color */
  LCD_SetBackColor(Blue);

  /* Set the LCD Text Color */
  LCD_SetTextColor(White);

  /* Disable the JoyStick interrupts */
  IntExtOnOffConfig(DISABLE);

  while(ReadKey() != NOKEY)
  {
  }

  /* Configure the EXTI Line 8 */
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Line = EXTI_Line8;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  /* Enable the EXTI0 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  LCD_DisplayStringLine(Line4, "  MCU in STOP Mode  "); 
  LCD_DisplayStringLine(Line5, "To exit press Key   ");
  LCD_DisplayStringLine(Line6, "push button         ");

  /* Clear the RTC Alarm flag */
  RTC_ClearFlag(RTC_FLAG_ALR);
  
  /* Save the GPIO pins current configuration then put all GPIO pins in Analog
     Input mode ...*/
  GPIO_SaveConfig();

  /* ... and keep PG.08 configuration which will be used as EXTI Line8 source */
  GPIOG->CRH = 0x4;
    
  /* Request to enter STOP mode with regulator in low power */
  PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
  
  /* Restore the GPIO Configurations*/
  GPIO_RestoreConfig();

/* At this stage the system has resumed from STOP mode ************************/
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Line = EXTI_Line8;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = DISABLE;
  EXTI_Init(&EXTI_InitStructure);

  /* Enable the EXTI9_5 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Configures system clock after wake-up from STOP: enable HSE, PLL and select PLL
     as system clock source (HSE and PLL are disabled in STOP mode) */
  SYSCLKConfig_STOP();

  while(ReadKey() != NOKEY)
  {
  }

  if(STOPModeStatus != RESET)
  {
    LCD_DisplayStringLine(Line4, "      STOP Mode     ");
    LCD_DisplayStringLine(Line5, "Wake-Up by RTC Alarm");
    LCD_DisplayStringLine(Line6, "Press JoyStick to   ");
    LCD_DisplayStringLine(Line7, "continue...         ");
  }
  else
  {
    LCD_DisplayStringLine(Line4, "      STOP Mode     ");
    LCD_DisplayStringLine(Line5, "WakeUp by Key Button");
    LCD_DisplayStringLine(Line6, "Press JoyStick to   ");
    LCD_DisplayStringLine(Line7, "continue...         ");
  }
  
  while(ReadKey() == NOKEY)
  {
  }

  /* Clear the LCD */
  LCD_Clear(White);
  /* Display the previous menu */
  DisplayMenu();
  /* Enable the JoyStick interrupts */
  IntExtOnOffConfig(ENABLE);
}

/*******************************************************************************
* Function Name  : EnterSTOPMode_RTCAlarm
* Description    : Enters MCU in STOP mode. The wake-up from STOP mode is 
*                  performed by an RTC Alarm.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void EnterSTOPMode_RTCAlarm(void)
{  
  u32 tmp = 0;

  /* Clear the LCD */
  LCD_Clear(White);
  /* Set the LCD Back Color */
  LCD_SetBackColor(Blue);

  /* Set the LCD Text Color */
  LCD_SetTextColor(White);

  /* Disable the JoyStick interrupts */
  IntExtOnOffConfig(DISABLE);

  while(ReadKey() != NOKEY)
  {
  }

  if(BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5)
  {
    LCD_DisplayStringLine(Line1, "Time and Date are   ");
    LCD_DisplayStringLine(Line2, "not configured,     ");