mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
synced 2025-05-08 19:29:40 +08:00
117 lines
5.3 KiB
Plaintext
117 lines
5.3 KiB
Plaintext
/**
|
|
@page TIM_OCActive Output Compare Active example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
|
|
* @file TIM/TIM_OCActive/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief This example shows how to configure the Timer to generate four
|
|
* delayed signals.
|
|
******************************************************************************
|
|
*
|
|
* 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 configure the TIM peripheral to generate four different
|
|
signals with four different delays.
|
|
|
|
The TIM3CLK frequency is set to SystemCoreClock / 2 (Hz), and the objective is
|
|
to get TIM3 counter clock at 2 KHz so the Prescaler is computed as following:
|
|
- Prescaler = (TIM3CLK / TIM3 counter clock) - 1
|
|
|
|
SystemCoreClock is set to 168 MHz.
|
|
|
|
The TIM3 CCR1 register value is equal to 1000:
|
|
TIM3_CH1 delay = CCR1_Val/TIM3 counter clock = 500 ms
|
|
so the TIM3 Channel 1 generates a signal with a delay equal to 500 ms.
|
|
|
|
The TIM3 CCR2 register value is equal to 500:
|
|
TIM3_CH2 delay = CCR2_Val/TIM3 counter clock = 250 ms
|
|
so the TIM3 Channel 2 generates a signal with a delay equal to 250 ms.
|
|
|
|
The TIM3 CCR3 register value is equal to 250:
|
|
TIM3_CH3 delay = CCR3_Val/TIM3 counter clock = 125 ms
|
|
so the TIM3 Channel 3 generates a signal with a delay equal to 125 ms.
|
|
|
|
The TIM3 CCR4 register value is equal to 125:
|
|
TIM3_CH4 delay = CCR4_Val/TIM3 counter clock = 62.5 ms
|
|
so the TIM3 Channel 4 generates a signal with a delay equal to 62.5 ms.
|
|
|
|
The delay correspond to the time difference between PG.06 falling edge and
|
|
TIM3_CHx signal rising edges.
|
|
|
|
|
|
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
|
|
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
|
|
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
|
|
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
|
|
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
|
|
|
|
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
|
|
to have correct HAL operation.
|
|
|
|
@note LED4 is turned ON, because it's sharing the same GPIO pin with the TIM3 channel 2.
|
|
|
|
|
|
@par Directory contents
|
|
|
|
- TIM/TIM_OCActive/Inc/stm32f4xx_hal_conf.h HAL configuration file
|
|
- TIM/TIM_OCActive/Inc/stm32f4xx_it.h Interrupt handlers header file
|
|
- TIM/TIM_OCActive/Inc/main.h Main program header file
|
|
- TIM/TIM_OCActive/Src/stm32f4xx_it.c Interrupt handlers
|
|
- TIM/TIM_OCActive/Src/main.c Main program
|
|
- TIM/TIM_OCActive/Src/stm32f4xx_hal_msp.c HAL MSP module
|
|
- TIM/TIM_OCActive/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
|
|
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F407xx/417xx devices.
|
|
|
|
- This example has been tested with STMicroelectronics STM324xG-EVAL RevC
|
|
evaluation boards and can be easily tailored to any other supported device and development board
|
|
|
|
- STM324xG-EVAL RevC Set-up
|
|
- Connect the following pins to an oscilloscope to monitor the different
|
|
waveforms:
|
|
- Use LED1 connected to PG.06 (Reference)
|
|
- PC.06 (TIM3_CH1)
|
|
- PC.07 (TIM3_CH2)
|
|
- PC.08 (TIM3_CH3)
|
|
- PC.09 (TIM3_CH4)
|
|
|
|
|
|
@par How to use it ?
|
|
|
|
In order to make the program work, you must do the following :
|
|
- Open your preferred toolchain
|
|
- Rebuild all files and load your image into target memory
|
|
- Run the example
|
|
|
|
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
|
|
*/
|