/**
@page TIM_OnePulse TIM One Pulse example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file TIM/TIM_OnePulse/readme.txt
* @author MCD Application Team
* @brief Description of the TIM One Pulse example.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@endverbatim
@par Example Description
This example shows how to use the TIM peripheral to generate a single pulse when
a rising edge of an external signal is received on the timer Input pin.
Clock setup for TIM4
================================
TIM4CLK = SystemCoreClock = 100 MHz.
Prescaler = (TIM4CLK /TIM4 counter clock) - 1
The prescaler value is computed in order to have TIM4 counter clock
set at 25000000 Hz.
The Autoreload value is 65535 (TIM4->ARR), so the maximum frequency value to
trigger the TIM4 input is 25000000/65535 [Hz].
Configuration of TIM4 in One Pulse Mode
===================================================
- The external signal is connected to TIM4_CH2 pin (PB.07),
and a rising edge on this input is used to trigger the Timer.
- The One Pulse signal is output on TIM4_CH1 (PB.06).
The delay value is fixed to:
- Delay = CCR1/TIM4 counter clock
= 16383 / 25000000 [sec]
The pulse value is fixed to :
- Pulse value = (TIM_Period - TIM_Pulse)/TIM4 counter clock
= (65535 - 16383) / 25000000 [sec]
The one pulse waveform can be displayed using an oscilloscope and it looks
like this.
____
| |
CH2 _________________________| |__________________________________________
___________________________
| |
CH1 ______________________________________| |_____
<---Delay----><------Pulse--------------->
@par Keywords
Timers, Output, signals, One Pulse, PWM, Oscilloscope, External signal, Autoreload, Waveform
@par Directory contents
- TIM/TIM_OnePulse/Inc/stm32f4xx_hal_conf.h HAL configuration file
- TIM/TIM_OnePulse/Inc/stm32f4xx_it.h Interrupt handlers header file
- TIM/TIM_OnePulse/Inc/main.h Header for main.c module
- TIM/TIM_OnePulse/Src/stm32f4xx_it.c Interrupt handlers
- TIM/TIM_OnePulse/Src/main.c Main program
- TIM/TIM_OnePulse/Src/stm32f4xx_hal_msp.c HAL MSP file
- TIM/TIM_OnePulse/Src/system_stm32f4xx.c STM32F4xx system source file
@par Hardware and Software environment
- This example runs on STM32F412xG devices.
- In this example, the clock is set to 100 MHz.
- This example has been tested with STM32412G-DISCOVERY board and can be
easily tailored to any other supported device and development board.
- STM32412G-DISCOVERY Set-up
- Connect the external signal to the TIM4_CH2 pin (PB.07) (P2, pin 24)
- Connect the TIM4_CH1 pin(PB.06) (P2, pin 23) to an oscilloscope to monitor the waveform.
@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)
*/
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