PWM-Input-Capture.rar_Capture_Input capture_PWM采集_stm32 input _获

|------------------------------------------------------------ |注：该例程裁剪于官方例程，已经在野火M3工程模板中编译成功， | |不提供具体的技术支持，有问题的到论坛发帖讨论。 | | | |野火M3技术讨论区：http://www.ourdev.cn/forum-1008-1.html | | | | WildFire Team 2012 于广州 | -------------------------------------------------------------- 以下是该例程的官方描述（为方便理解，fire已修改过） -------------------------------------------------------------- /** @page TIM_PWM_Input TIM_PWM_Input @verbatim ******************** (C) COPYRIGHT 2009 STMicroelectronics ******************* * @file TIM/PWM_Input/readme.txt * @author MCD Application Team * @version V3.0.0 * @date 04/06/2009 * @brief Description of the TIM PWM_Input example. ****************************************************************************** * 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. ****************************************************************************** @endverbatim @par Example Description This example shows how to use the TIM peripheral to measure the frequency and duty cycle of an external signal. The TIMxCLK frequency is set to 72 MHz, the Prescaler is 0 so the TIM2 counter clock is 72 MHz. so the minimum frequency value to measure is 1100 Hz. TIM2 is configured in PWM Input Mode: the external signal is connected to TIM2 Channel2 used as input pin. To measure the frequency and the duty cycle we use the TIM2 CC2 interrupt request, so In the TIM2_IRQHandler routine, the frequency and the duty cycle of the external signal are computed. The "Frequency" variable contains the external signal frequency: Frequency = TIM2 counter clock / TIM2_CCR2 in Hz, The "DutyCycle" variable contains the external signal duty cycle: DutyCycle = (TIM2_CCR1*100)/(TIM2_CCR2) in %. @par Directory contents - TIM/PWM_Input/stm32f10x_conf.h Library Configuration file - TIM/PWM_Input/stm32f10x_it.c Interrupt handlers - TIM/PWM_Input/stm32f10x_it.h Interrupt handlers header file - TIM/PWM_Input/main.c Main program - Connect the external signal to measure to the TIM2 CH2 pin (PA.01). - 将外部的需要测量的信号连接到TIM2 CH2 pin (PA.01)即可测量，野火M3开 - 发板中已经留有 PA.01 的端子接口，可方便用户连接外部信号。 @par How to use it ? In order to make the program work, you must do the following: - Create a project and setup all project configuration - Add the required Library files: - stm32f10x_gpio.c - stm32f10x_rcc.c - stm32f10x_tim.c - misc.c - system_stm32f10x.c @note - Low-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes. - Medium-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 32 and 128 Kbytes. - High-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes. * <h3><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h3> */