LSI clock source Capture by TIM1

  ******************** (C)COPYRIGHT 2014 STMicroelectronics *******************
  * @file    TIM1/TIM1_Input_Capture/readme.txt
  * @author  MCD Application Team
  * @version V2.2.0
  * @date    30-September-2014
  * @brief   Description of the TIM1 Input Capture  Example.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  

Example description

This example shows how to configure the TIM1 peripheral to capture the internal clock source (LSI).

TIM1CLK is fixed to 2 MHz, the TIM1 Prescaler is equal to 0 so the TIM1 counter clock used is 2 MHz. (By default, fTIM1= fMaster/8 )

The TIM1 Channel 1 is configured as Input capture. The LSI signal is redirected to the CCO output Pin. The TIM1 Channel 1 is connected to the CCO Pin.

The captured value of LSI clock Frequency is stored in the LSIClockFreq variable.

Directory contents

• TIM1\TIM1_Input_Capture\main.c Main file containing the "main" function
• TIM1\TIM1_Input_Capture\stm8s_conf.h Library Configuration file
• TIM1\TIM1_Input_Capture\stm8s_it.c Interrupt routines source
• TIM1\TIM1_Input_Capture\stm8s_it.h Interrupt routines declaration

Hardware and Software environment

• This example runs on STM8S and STM8A High density, Medium density and Low density devices.

• This example has been tested with STMicroelectronics STM8/128-EVAL evaluation board and can be easily tailored to any other development board.

• STM8/128-EVAL Set-up
  • Connect the configurable Clock Output pin CCO (PE.0) to the TIM1_CC1 pin (PC.1)

How to use it ?

In order to make the program work, you must do the following :

• Copy all source files from this example folder to the template folder under Project
• Open your preferred toolchain
• Rebuild all files and load your image into target memory
• Run the example
• Connect the TIM1_CC1 pin to COO pin
• Read the value of LSIClockFreq variable

Note:

• High-Density STM8A devices are the STM8AF52xx STM8AF6269/8x/Ax, STM8AF51xx, and STM8AF6169/7x/8x/9x/Ax microcontrollers where the Flash memory density ranges between 32 to 128 Kbytes
• Medium-Density STM8A devices are the STM8AF622x/4x, STM8AF6266/68, STM8AF612x/4x, and STM8AF6166/68 microcontrollers where the Flash memory density ranges between 8 to 32 Kbytes
• High-Density STM8S devices are the STM8S207xx, STM8S007 and STM8S208xx microcontrollers where the Flash memory density ranges between 32 to 128 Kbytes.
• Medium-Density STM8S devices are the STM8S105x and STM8S005 microcontrollers where the Flash memory density ranges between 16 to 32-Kbytes.
• Low-Density STM8S devices are the STM8S103xx, STM8S003 and STM8S903xx microcontrollers where the Flash density is 8 Kbytes.

© COPYRIGHT STMicroelectronics