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 Example5.
********************************************************************************
* 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 configure the TIM peripheral in Output Compare Timing 
mode with the corresponding Interrupt requests for each channel in order to generate
4 different time bases.

The TIMxCLK frequency is set to 36 MHz, the Prescaler is 0x4 so the TIM2 counter clock is
7.2 MHz. 

The TIM2 CC1 register value is equal to 0xC000, 
CC1 update rate = TIM2 counter clock / CCR1_Val = 146.48 Hz,
so the TIM2 Channel 1 generates an interrupt each 6.8ms

The TIM2 CC2 register is equal to 0x3FFF, 
CC2 update rate = TIM2 counter clock / CCR2_Val = 219.7 HzHz
so the TIM2 Channel 2 generates an interrupt each 4.55ms

The TIM2 CC3 register is equal to 0xFFF, 
CC3 update rate = TIM2 counter clock / CCR3_Val = 439.4Hz
so the TIM2 Channel 3 generates an interrupt each 2.27ms

The TIM2 CC4 register is equal to 0xBFF, 
CC4 update rate = TIM2 counter clock / CCR4_Val =  878.9 Hz
so the TIM2 Channel 4 generates an interrupt each 1.13ms.


When the counter value reaches the Output compare registers values, the Output 
Compare interrupts are generated and, in the handler routine, 4 pins(PC.06, PC.07, PC.08
and  PC.09) are toggled with the following frequencies: 

- PC.06: 73.24Hz (CC1)
- PC.07: 109.8Hz (CC2)
- PC.08: 219.7Hz (CC3) 
- PC.09: 439.4Hz (CC4)


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 an oscilloscope on PC.06, PC.07, PC.08 and  PC.09 to show the different Time Base signals.
  
  
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******