PWR停机模式文件描述

 STOP.rar   

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************************

* File Name          : readme.txt

* Author             : MCD Application Team

* Version            : V2.0.3

* Date               : 09/22/2008

* Description        : Description of the PWR STOP Example.

********************************************************************************************/

Example description 例程描述 经修改适用于万利STM3210B-LK1，翻译后有对应接口变动

===================

This example shows how to enter the system to STOP mode and wake-up using EXTI Line interrupts. The EXTI Line sources are PB.09/PG.08 and RTC Alarm.

这个例子描述了如何进入停机模式和如何使用中断线唤醒停机模式。中断线是PD3(EXTI_Line3)和RTC闹钟（EXTI_Line17)

The EXTI line9/8 is configured to generate interrupt on falling edge.

中断线EXTI_Line3被配置在下降沿产生中断   

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

The EXTI line17(RTC Alarm) is configured to generate interrupt on rising edge and the RTC time base is set to 1 second using the external low speed oscillator(LSE).

RTC闹钟被配置在上升沿产生中断，这里RTC时基被设置为1秒，使用外部低速外部晶振LSE

The system clock is set to 72 MHz using the external high speed oscillator(HSE).

系统时钟被为72MHZ，使用高速外部晶振HSE

系统进入和退出停机模式按如下方式：

The system enters and exits STOP mode as following:

   After 2 second from system start-up, the RTC is configured to generate an Alarm event in 3 second then the system enters STOP mode. To wake-up from STOP mode you have to apply a falling edge on EXTI line9/8, otherwise the  RTC Alarm will wake-up the system within 3 second. After exit from STOP the system clock is reconfigured to its previous state (as HSE and PLL are disabled in STOP mode).Then after a delay the system will enter again in STOP mode and exit in the way described above. This behavior is repeated in an infinite loop.

在系统启动后2秒，RTC被配置3秒后产生警报事件然后进入停机模式。如果要从停机模式唤醒，需在中断线EXTI_Line3配置下降沿，否则RTC报警将在3秒内唤醒系统。从停机模式退出后系统时钟要重新配置（因为HSE,PLL振荡器的功能被禁用）。然后将会有一段额外的启动延时，紧接着又进入停机模式，无限循环。

/*******************************************************************************
* Function Name  : SYSCLKConfig_STOP 
HSE,PLL重新配置
* 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)
{
  /* 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)
    {
    }
  }
}

注意：万利的板子PC7--LED1  PC6--LED2  PC5--LED3  PC4---LED4  KEY2--PD4       

Four leds connected to GPIO_LED Pin6(LD1), Pin7(LD2) and Pin8(LD3) are used to monitor the system state as following:

 - LD1 on: system in RUN mode   LD1灯亮表示系统处在运行模式 

 - LD1 off: system in STOP mode LD1灭表示系统处在停机模式

 - LD2 is toggled if EXTI Line9/8 is used to exit from STOP  按KEY2后LD2翻转表示从停机模式退出

 - LD3 is toggled if EXTI line17(RTC Alarm) is used to exit from STOP 

   RTC警报触发后LD3翻转表示从停机模式退出

******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE******