STM32F0xx Standard Peripherals Firmware Library: TIM OC_Toggle Description

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    TIM/TIM_OCToggle/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   TIM OC Toggle mode Description.
  ******************************************************************************
  *
  * 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 TIM3 peripheral to generate four different signals with four different frequencies.

The TIM3CLK frequency is set to 48 MHz

The TIM3 CCR1 register value is equal to 40961: CC1 update rate = TIM3 counter clock / CCR1_Val = 1171.8Hz, so the TIM3 Channel 1 generates a periodic signal with a frequency equal to 585.9Hz.

The TIM3 CCR2 register is equal to 20480: CC2 update rate = TIM3 counter clock / CCR2_Val = 2343.75Hz so the TIM3 channel 2 generates a periodic signal with a frequency equal to 1171.8Hz.

The TIM3 CCR3 register is equal to 10240: CC3 update rate = TIM3 counter clock / CCR3_Val = 4687.5Hz so the TIM3 channel 3 generates a periodic signal with a frequency equal to 2343.75Hz.

The TIM3 CCR4 register is equal to 5120: CC4 update rate = TIM3 counter clock / CCR4_Val = 9375Hz so the TIM3 channel 4 generates a periodic signal with a frequency equal to 4687.5Hz.

Directory contents

• TIM/TIM_OCToggle/stm32f0xx_conf.h Library Configuration file
• TIM/TIM_OCToggle/stm32f0xx_it.c Interrupt handlers
• TIM/TIM_OCToggle/stm32f0xx_it.h Interrupt handlers header file
• TIM/TIM_OCToggle/main.c Main program
• TIM/TIM_OCToggle/main.h Header for main.c module
• TIM/TIM_OCToggle/system_stm32f0xx.c STM32F0xx system source file

Note:

The "system_stm32f0xx.c" is generated by an automatic clock configuration tool and can be easily customized to meet user application requirements. To select different clock setup, use the "STM32F0xx_Clock_Configuration_VX.Y.Z.xls" provided with the AN4055 package available on ST Microcontrollers

Hardware and Software environment

• This example runs on STM32F0xx devices.

• This example has been tested with STMicroelectronics STM32F0Discovery and STM32072B-EVAL including respectively STM32F051R8T6 and STM32F072VBT6 devices and can be easily tailored to any other supported device and development board.

• STM32F0Discovery board Set-up
  • Connect the following pins to an oscilloscope to monitor the different waveforms:
    • PA.06 (TIM3_CH1)
    • PA.07 (TIM3_CH2)
    • PB.00 (TIM3_CH3)
    • PB.01 (TIM3_CH4)

• STM32072B-EVAL Set-up
  • Connect the following pins to an oscilloscope to monitor the different waveforms:
    • PA.06 (TIM3_CH1)
    • PA.07 (TIM3_CH2)
    • PB.00 (TIM3_CH3)
    • PB.01 (TIM3_CH4)

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
• Select the appropriate workspace
• Rebuild all files and load your image into target memory
• Run the example

© COPYRIGHT STMicroelectronics