STM32停机例程

/******************** (C) COPYRIGHT 2007 STMicroelectronics ******************** * File Name : readme.txt * Author : MCD Application Team * Version : V1.0 * Date : 10/08/2007 * Description : Description of the PWR Example2. ******************************************************************************** * THE PRESENT SOFTWARE 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 SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. *******************************************************************************/ 本例展示了如何使STM32进入待机模式（Standby Mode），以及如何通过外部重置、实时时钟闹钟（RTC Alarm）或者WKUP管脚来唤醒STM32。 在例程中，设置在外部中断线9上（管脚PB.09）检测到下降沿时产生中断。以及Systick每隔250ms产生一个中断，在这个中断中，改变连接在PC.06管脚上LED的状态，以次来提示系统工作在运行模式（RUN mode）。 一旦在外部中断线9上（管脚PB.09）检测到下降沿，系统将开启实时时钟闹钟（RTC Alarm），每三秒钟产生一个闹钟事件（Alarm event）。然后系统进入待机模式（Standby Mode）。在3秒内，在WKUP管脚上的上升沿或者外部复位都可以把系统从待机模式中唤醒，如果3秒内他们没有发生，那么由实时时钟闹钟自动唤醒系统。 系统被唤醒以后，程序执行的顺序与重置后一样，PC.06上的LED开始闪耀，PC.07上的LED被点亮。实时时钟（RTC）设置被保留，因此无须对其再进行设置。 LED可以提示系统当前的状态： - LD1 闪耀: 系统在运行模式（RUN mode）下 - LD1 off / LD2 off: 系统在待机模式（Standby Mode）下 - LD2 on: 系统退出待机模式（Standby Mode） Example description =================== This example shows how to enters the system to STANDBY mode and wake-up from this mode using: external RESET, RTC Alarm or WKUP pin. In the associated software, the system clock is set to 72 MHz, the EXTI line9(PB.09) is configured to generate an interrupt on falling edge and the SysTick is programmed to generate an interrupt each 250 ms. In the SysTick interrupt handler, a led connected to PC.06 pin is toggled, this is used to indicate whether the MCU is in STANDBY or RUN mode. When a falling edge is detected on EXTI line9 an interrupt is generated. In the EXTI handler routine the RTC is configured to generate an Alarm event in 3 second then the system enters STANDBY mode causing the PC.06 pin to stop toggling. A rising edge on WKUP pin or an external RESET will wake-up the system from STANDBY. If within 3 second neither rising edge on WKUP pin nor external RESET are generated, the RTC Alarm will wake-up the system. After wake-up from STANDBY mode, program execution restarts in the same way as after a RESET, the PC.06 pin restarts toggling, PC.07 pin is set to high level and the RTC configuration (clock source, enable, prescaler,...) is kept. As result there is no need to configure the RTC. Two leds connected to PC.06(LD1) and PC.07(LD2) pins are used to monitor the system state as following: - LD1 toggling: system in RUN mode - LD1 off / LD2 off: system in STANDBY mode - LD2 on: system resumed from STANDBY mode Directory contents ================== stm32f10x_conf.h Library Configuration file stm32f10x_it.c Interrupt handlers stm32f10x_it.h Header for stm32f10x_it.c main.c Main program Hardware environment ==================== - Connect two leds to pins PC.06 and PC.07 (respectively LD1 and LD2 on STM3210B-EVAL board). - Connect a push-button to pin PB.09 (Key push-button on STM3210B-EVAL board). - Connect a push-button to WKUP(PA.00) pin (Wakep push-button on STM3210B-EVAL board). How to use it ============= In order to make the program work, you must do the following : - Create a project and setup all your toolchain's start-up files - Compile the directory content files and required Library files: + stm32f10x_nvic.c + stm32f10x_rcc.c + stm32f10x_lib.c + stm32f10x_gpio.c + stm32f10x_rtc.c + stm32f10x_pwr.c + stm32f10x_bkp.c + stm32f10x_exti.c + stm32f10x_flash.c + stm32f10x_systick.c - Link all compiled files and load your image in Flash - Run the example in standalone mode (without debugger connection) ******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE******