mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
synced 2025-05-08 19:29:40 +08:00
119 lines
5.1 KiB
Plaintext
119 lines
5.1 KiB
Plaintext
/**
|
|
@page TIM_Synchronization Timers Synchronization example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
|
|
* @file TIM/TIM_Synchronization/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief How to command 2 Timers as slaves (TIM3 & TIM4) using a Timer
|
|
* as master (TIM1)
|
|
|
|
******************************************************************************
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without modification,
|
|
* are permitted provided that the following conditions are met:
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
* 3. Neither the name of STMicroelectronics nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
******************************************************************************
|
|
@endverbatim
|
|
|
|
@par Example Description
|
|
|
|
This example shows how to synchronize TIM1 and Timers (TIM3 and TIM4) in parallel mode.
|
|
|
|
Timers synchronisation in parallel mode:
|
|
|
|
|
|
___________
|
|
ITR0 | SLAVE 1 |
|
|
_________________| TIM3 |
|
|
___________ | |___________|
|
|
| MASTER |TRGO_Update |
|
|
| TIM1 |---------------------|
|
|
|___________| | ___________
|
|
|_________________| SLAVE 2 |
|
|
ITR0 | TIM4 |
|
|
|___________|
|
|
|
|
|
|
1/ TIM1 is configured as Master Timer:
|
|
- PWM Mode is used
|
|
- The TIM1 Update event is used as Trigger Output
|
|
|
|
2/ TIM3 and TIM4 are slaves for TIM1,
|
|
- PWM Mode is used
|
|
- The ITR0(TIM1) is used as input trigger for both slaves
|
|
- Gated mode is used, so starts and stops of slaves counters
|
|
are controlled by the Master trigger output signal(update event).
|
|
|
|
The TIM1 counter clock is 180 MHz.
|
|
|
|
The Master Timer TIM1 is running at:
|
|
TIM1 frequency = TIM1 counter clock / (TIM1_Period + 1) = 703.125 KHz and
|
|
a the duty cycle equal to: TIM1_CCR1/(TIM1_ARR + 1) = 50%
|
|
|
|
The TIM3 is running at:
|
|
(TIM1 frequency)/ ((TIM3 period +1)* (TIM1_Repetition_Counter+1)) = 46.875 KHz and
|
|
a duty cycle equal to TIM3_CCR1/(TIM3_ARR + 1) = 33.3%
|
|
|
|
The TIM4 is running at:
|
|
(TIM1 frequency)/ ((TIM4 period +1)* (Repetition_Counter+1)) = 70.312 KHz and
|
|
a duty cycle equal to TIM4_CCR1/(TIM4_ARR + 1) = 50%
|
|
|
|
|
|
The PWM waveform can be displayed using an oscilloscope.
|
|
|
|
|
|
@par Directory contents
|
|
|
|
- TIM/TIM_Synchronization/Inc/stm32f4xx_hal_conf.h HAL configuration file
|
|
- TIM/TIM_Synchronization/Inc/stm32f4xx_it.h Interrupt handlers header file
|
|
- TIM/TIM_Synchronization/Inc/main.h Header for main.c module
|
|
- TIM/TIM_Synchronization/Src/stm32f4xx_it.c Interrupt handlers
|
|
- TIM/TIM_Synchronization/Src/main.c Main program
|
|
- TIM/TIM_Synchronization/Src/stm32f4xx_hal_msp.c HAL MSP file
|
|
- TIM/TIM_Synchronization/Src/system_stm32f4xx.c STM32F4xx system source file
|
|
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F446xx devices.
|
|
|
|
- This example has been tested with STM32446E-EVAL board and can be
|
|
easily tailored to any other supported device and development board.
|
|
|
|
- STM32446E-EVAL Set-up
|
|
Connect the following pins to an oscilloscope to monitor the different waveforms:
|
|
- TIM1 CH1 (PA.08 : pin 1 in CN6 connector)
|
|
- TIM3 CH1 (PC.06)
|
|
- TIM4 CH3 (PB.08)
|
|
|
|
@par How to use it ?
|
|
|
|
In order to make the program work, you must do the following :
|
|
- Open your preferred toolchain
|
|
- Rebuild all files: Project->Rebuild all
|
|
- Load project image: Project->Download and Debug
|
|
- Run program: Debug->Go(F5)
|
|
|
|
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
|
|
*/
|