112 lines
5.2 KiB
Plaintext
112 lines
5.2 KiB
Plaintext
/**
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@page TIM_OCToggle TIM Output Compare Toggle example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file TIM/TIM_OCToggle/readme.txt
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* @author MCD Application Team
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* @brief This example shows how to configure the Timer to generate four
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* delayed signals.
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******************************************************************************
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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This example shows how to configure the TIM peripheral to generate four different
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signals with four different frequencies.
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The TIM3CLK frequency is set to SystemCoreClock / 2 (Hz), and we want to get TIM3
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counter clock at 21 MHz so the Prescaler is computed as following:
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- Prescaler = (TIM3CLK / TIM3 counter clock) - 1
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SystemCoreClock is set to 180 MHz for STM32F4xx devices
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The TIM3 CCR1 register value is equal to 40961:
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CC1 update rate = TIM3 counter clock / CCR1_Val = 439.44 Hz,
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so the TIM3 Channel 1 generates a periodic signal with a frequency equal to 219.72 Hz.
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The TIM3 CCR2 register is equal to 20480:
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CC2 update rate = TIM3 counter clock / CCR2_Val = 878.9 Hz
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so the TIM3 channel 2 generates a periodic signal with a frequency equal to 439.45 Hz.
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The TIM3 CCR3 register is equal to 10240:
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CC3 update rate = TIM3 counter clock / CCR3_Val = 1757.81 Hz
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so the TIM3 channel 3 generates a periodic signal with a frequency equal to 878.9 Hz.
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The TIM3 CCR4 register is equal to 5120:
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CC4 update rate = TIM3 counter clock / CCR4_Val = 3515.62 Hz
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so the TIM3 channel 4 generates a periodic signal with a frequency equal to 1757.81 Hz.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@par Keywords
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Timers, Output, signals, Outpur compare toggle, PWM, Oscilloscope
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@par Directory contents
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- TIM/TIM_OCToggle/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- TIM/TIM_OCToggle/Inc/stm32f4xx_it.h Interrupt handlers header file
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- TIM/TIM_OCToggle/Inc/main.h Main program header file
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- TIM/TIM_OCToggle/Src/stm32f4xx_it.c Interrupt handlers
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- TIM/TIM_OCToggle/Src/main.c Main program
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- TIM/TIM_OCToggle/Src/stm32f4xx_hal_msp.c HAL MSP module
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- TIM/TIM_OCToggle/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
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@par Hardware and Software environment
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- This example runs on STM32F429xx/STM32F439xx devices.
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- This example has been tested with STMicroelectronics STM324x9I-EVAL RevB
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evaluation boards and can be easily tailored to any other supported device and development board
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- STM324x9I-EVAL RevB Set-up
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- Connect the TIM3 pins to an oscilloscope to monitor the different waveforms:
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- PC.06 (TIM3_CH1)
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- PC.07 (TIM3_CH2)
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- PC.08 (TIM3_CH3)
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- PC.09 (TIM3_CH4)
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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