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109 lines
4.7 KiB
Plaintext
109 lines
4.7 KiB
Plaintext
/**
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@page TIM_Encoder Encoder example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file TIM/TIM_Encoder/readme.txt
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* @author MCD Application Team
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* @brief This example shows how to configure the Timer in Encoder interface
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* to determinate the rotation direction.
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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 configure the TIM1 peripheral in encoder mode to
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determinate the rotation direction.
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------------- -------------
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| |CH1:PB.04 CH1:PA.08 | |
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| |---------------------------->| |
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| TIM3 | | TIM1 |
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| |CH2:PB.05 CH2:PA.09 | |
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| Quadrature |---------------------------->| Quadrature |
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| encoder | | encoder |
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| emulator | | interface |
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| | | |
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| | | |
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| | |-------------| -----------
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| | | Direction |--> |uwDirection|
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------------- ------------- -----------
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Encoder interface example description
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To emulate a quadrature encoder, TIM3 is configured in toggle mode to generate
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2 quadrature signals on (PC6 and PC7) at 10KHz. Each 1s, signals change phase
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(+90<39>/-90<39>) to emulate a Forward/Backward rotation.
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TIM1 is configured in encoder mode interface, counting on TI1 and TI2.
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The counting direction corresponds to the rotation direction of the connected
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sensor (emulated by TIM3 signals).
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Rotation direction can be monitored by putting "uwDirection" variable in the
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Live Watch window.
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When uwDirection = 0, and according to the "Counting direction versus encoder
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signals" table, rotation direction is Forward.
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When uwDirection = 1, and according to the "Counting direction versus encoder
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signals" table, rotation direction is Backward.
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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 need 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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Timer, Encoder mode, Master, Slave, Duty Cycle, rotation direction, Waveform, Oscilloscope, Output, Signal
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@par Directory contents
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- TIM/TIM_Encoder/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- TIM/TIM_Encoder/Inc/stm32f4xx_it.h Interrupt handlers header file
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- TIM/TIM_Encoder/Inc/main.h Header for main.c module
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- TIM/TIM_Encoder/Src/stm32f4xx_it.c Interrupt handlers
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- TIM/TIM_Encoder/Src/main.c Main program
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- TIM/TIM_Encoder/Src/stm32f4xx_hal_msp.c HAL MSP file
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- TIM/TIM_Encoder/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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- This example has been tested with STM32446E-EVAL board and can be
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easily tailored to any other supported device and development board.
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- STM32446E-EVAL Set-up
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- Connect PB.04 (TIM3_Channel 1) to PA.08(Pin 1 in CN6 connector) (TIM1_Channel 1).
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- Connect PB.05 (TIM3_Channel 2) to PA.09 (TIM1_Channel 2).
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- Put uwDirection in the debugger live watch to detect the rotation direction
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change.
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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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