/**
@page TIM_Encoder Encoder example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file TIM/TIM_Encoder/Readme.txt
* @author MCD Application Team
* @brief This example shows how to configure the Timer in Encoder interface
* to determinate the rotation direction.
******************************************************************************
* @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
Configuration of the TIM1 peripheral in Encoder mode to
determinate the rotation direction.
------------- -------------
| |CH1:PC6 CH1:PA8 | |
| |---------------------------->| |
| TIM3 | | TIM1 |
| |CH1:PC7 CH1:PE11 | |
| Quadrature |---------------------------->| Quadrature |
| encoder | | encoder |
| emulator | | interface |
| | | |
| | | |
| | |-------------| -----------
| | | Direction |--> |uwDirection|
------------- ------------- -----------
Encoder interface example description
To emulate a quadrature encoder, TIM3 is configured in toggle mode to generate
2 quadrature signals on (PC6 and PC7) at 10KHz. Each 1s, signals change phase
(+90<39>/-90<39>) to emulate a Forward/Backward rotation.
TIM1 is configured in encoder mode interface, counting on TI1 and TI2.
The counting direction corresponds to the rotation direction of the connected
sensor (emulated by TIM3 signals).
Rotation direction can be monitored by putting "uwDirection" variable in the
Live Watch window.
When uwDirection = 0, and according to the "Counting direction versus encoder
signals" table, rotation direction is Forward.
When uwDirection = 1, and according to the "Counting direction versus encoder
signals" table, rotation direction is Backward.
@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_Encoder/Inc/stm32f2xx_conf.h Library Configuration file
- TIM/TIM_Encoder/Inc/stm32f2xx_it.h Interrupt handlers header file
- TIM/TIM_Encoder/Inc/main.h Main program header file
- TIM/TIM_Encoder/Src/stm32f2xx_it.c Interrupt handlers
- TIM/TIM_Encoder/Src/main.c Main program
- TIM/TIM_Encoder/Src/stm32f2xx_hal_msp.c HAL MSP file
- TIM/TIM_Encoder/Src/system_stm32f2xx.c STM32F2xx system clock configuration file
@par Hardware and Software environment
- This example runs on STM32F207xx/217xx device.
- This example has been tested with STMicroelectronics STM322xG-EVAL
evaluation boards and can be easily tailored to any other supported device and development board
- STM322xG-EVAL Set-up
- Connect PC6(Pin21 in CN3) (TIM3_Channel 1) to PA8(Pin16 in CN3) (TIM1_Channel 1).
- Connect PC7(Pin20 in CN3) (TIM3_Channel 2) to PE11(Pin26 in CN2) (TIM1_Channel 2).
- Put uwDirection in the debugger live watch to detect the rotation direction
change.
@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
*/
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