readme.txt

新型的M3核ARM开发例程

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : readme.txt
* Author             : MCD Application Team
* Date First Issued  : 05/21/2007
* Description        : Description of the TIM Example7.
********************************************************************************
* History:
* 05/21/2007: V0.3
********************************************************************************
* 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.
*******************************************************************************/

Example description
===================

This example shows how to use the TIM peripheral to generate a One pulse Mode 
after a Rising edge of an external signal is received in Timer Input pin.

The TIMxCLK frequency is set to 72 MHz, the Prescaler is 0x1 so the TIM2 counter clock is
36 MHz. 
The Autoreload value is 0xFFFF (TIM2->ARR), so the maximum frequency value to trigger 
the TIM2 input is 500 Hz.

The TIM2 is configured as following: 
The One Pulse mode is used, the external signal is connected to TIM2 CH2 pin (PA.01), 
the Rising edge is used as active edge, the One Pulse signal is outputted 
on TIM2 CH1 (PA.00).

The TIM_Pulse defines the delay value, the delay value is fixed to 455.08 us:
delay =  CCR1/TIM2 counter clock = 455.08 us. 
The (TIM_Period - TIM_Pulse) defines the One Pulse value, the pulse value is fixed to 1.365ms:
One Pulse value = (TIM_Period - TIM_Pulse)/TIM2 counter clock = 1.365 ms.

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
====================
Connect the external signal to measure to the TIM2 CH2 pin (PA.01)
Connect the TIM2 CH1 (PA.00) pin to an oscilloscope to show the waveform.
   
  
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 either RAM or Flash
- Run the example


******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE******