108 lines
3.7 KiB
Plaintext
108 lines
3.7 KiB
Plaintext
/**
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@page TIM_OnePulse TIM One Pulse example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file TIM/TIM_OnePulse/readme.txt
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* @author MCD Application Team
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* @brief Description of the TIM One Pulse example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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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 use the TIM peripheral to generate a single pulse when
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a rising edge of an external signal is received on the timer Input pin.
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Clock setup for TIM5
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================================
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TIM3CLK = SystemCoreClock = 180 MHz.
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Prescaler = (TIM3CLK /TIM3 counter clock) - 1
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The prescaler value is computed in order to have TIM5 counter clock
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set at 18000000 Hz.
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The Autoreload value is 65535 (TIM3->ARR), so the maximum frequency value to
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trigger the TIM3 input is 18000000/65535 [Hz].
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Configuration of TIM5 in One Pulse Mode
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===================================================
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- The external signal is connected to TIM3_CH2 pin (PB.05),
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and a rising edge on this input is used to trigger the Timer.
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- The One Pulse signal is output on TIM3_CH1 (PB.04).
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The delay value is fixed to:
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- Delay = CCR1/TIM5 counter clock
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= 16383 / 18000000 [sec]
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The pulse value is fixed to :
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- Pulse value = (TIM_Period - TIM_Pulse)/TIM5 counter clock
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= (65535 - 16383) / 18000000 [sec]
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The one pulse waveform can be displayed using an oscilloscope and it looks
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like this.
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____
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CH2 _________________________| |__________________________________________
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___________________________
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CH1 ______________________________________| |_____
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<---Delay----><------Pulse--------------->
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@par Keywords
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Timers, Output, signals, One Pulse, PWM, Oscilloscope, External signal, Autoreload, Waveform
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@par Directory contents
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- TIM/TIM_OnePulse/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- TIM/TIM_OnePulse/Inc/stm32f4xx_it.h Interrupt handlers header file
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- TIM/TIM_OnePulse/Inc/main.h Header for main.c module
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- TIM/TIM_OnePulse/Src/stm32f4xx_it.c Interrupt handlers
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- TIM/TIM_OnePulse/Src/main.c Main program
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- TIM/TIM_OnePulse/Src/stm32f4xx_hal_msp.c HAL MSP file
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- TIM/TIM_OnePulse/Src/system_stm32f4xx.c STM32F4xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F446xx devices.
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- In this example, the clock is set to 180 MHz.
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- This example has been tested with NUCLEO-446ZE Rev.B board and can be
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easily tailored to any other supported device and development board.
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- NUCLEO-446ZE Set-up
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- Connect the external signal to the TIM3_CH2 pin (PB.05) (CN7, pin 13)
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- Connect the TIM3_CH1 pin(PB.04) (CN7, pin 19) to an oscilloscope to monitor the waveform.
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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: Project->Rebuild all
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- Load project image: Project->Download and Debug
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- Run program: Debug->Go(F5)
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*/
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