STM8S/A Standard Peripherals Firmware Library: Generate 3 different signals with 3 different delays with Inactive Mode

STM8S/A

Generate 3 different signals with 3 different delays with Inactive Mode
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  * @file    TIM2/TIM2_OC_InactiveMode/readme.txt
  * @author  MCD Application Team
  * @version V2.2.0
  * @date    30-September-2014
  * @brief   Description of the TIM2 Output compare Inactive mode 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 TIM peripheral to generate 3 different signals with 3 different delays.

The TIM2CLK frequency is set to 2 MHz, the Prescaler is set to 2048 and used in Output Compare Inactive Mode.

TIM2 counter clock = TIM2CLK / (Prescaler) = 976 Hz

The TIM2 CCR1 register value is equal to 976: TIM2_CH1 delay = CCR1_Val/TIM2 counter clock = 1000 ms so the TIM2 Channel 1 generates a signal with a delay equal to 1000 ms.

The TIM2 CCR2 register value is equal to 488: TIM2_CH2 delay = CCR2_Val/TIM2 counter clock = 500 ms so the TIM2 Channel 2 generates a signal with a delay equal to 500 ms.

The TIM2 CCR3 register value is equal to 244: TIM2_CH3 delay = CCR3_Val/TIM2 counter clock = 250 ms so the TIM2 Channel 3 generates a signal with a delay equal to 250 ms.

Directory contents
Hardware and Software environment
  • This example runs on STM8S and STM8A High density, Medium density devices and STM8S103x 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 following pins to an oscilloscope:
      • Pin PG.5
      • Pin PG.6
      • Pin PG.7
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 PG.5 , PG.6 and PG.7 pins to an oscilloscope
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.

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