PWM_Input

所属分类:其他嵌入式/单片机内容
开发工具:C/C++
文件大小:8KB
下载次数:1078
上传日期:2010-03-11 13:19:08
上 传 者kaibest
说明:  STM32定时器PWM输入捕获,利用TIM1计算脉冲频率及占空比。
(This example shows how to use the TIM peripheral to measure the frequency and duty cycle of an external signal.)

文件列表:
PWM_Input\main.c (7478, 2008-09-23)
PWM_Input\stm32f10x_conf.h (6305, 2008-09-23)
PWM_Input\stm32f10x_it.c (29566, 2008-09-23)
PWM_Input\stm32f10x_it.h (3842, 2008-09-23)
PWM_Input (0, 2010-03-11)

/******************** (C) COPYRIGHT 2008 STMicroelectronics ******************** * File Name : readme.txt * Author : MCD Application Team * Version : V2.0.1 * Date : 06/13/2008 * Description : 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. *******************************************************************************/ 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 %. Directory contents ================== stm32f10x_conf.h Library Configuration file stm32f10x_it.c Interrupt handlers stm32f10x_it.h Interrupt handlers header file main.c Main program Hardware environment ==================== This example runs on STMicroelectronics STM3210B-EVAL and STM3210E-EVAL evaluation boards and can be easily tailored to any other hardware. Connect the external signal to measure to the TIM2 CH2 pin (PA.01). 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_lib.c + stm32f10x_tim.c + stm32f10x_gpio.c + stm32f10x_rcc.c + stm32f10x_nvic.c + stm32f10x_flash.c - Link all compiled files and load your image into target memory - Run the example ******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE******

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