/**
@page TIM_ComplementarySignals TIM Complementary Signals example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file TIM/TIM_ComplementarySignals/Readme.txt
* @author MCD Application Team
* @brief Description of the TIM Complementary Signals 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
Configuration of the TIM1 peripheral to generate three
complementary signals, insert a predefined deadtime value, use the break
feature, and lock the break and dead-time configuration.
TIM1CLK is fixed to SystemCoreClock, the TIM1 Prescaler is set to have
TIM1 counter clock = 18MHz.
The objective is to generate PWM signal at 10 KHz:
- TIM1_Period = (SystemCoreClock / 10000) - 1
The Three Duty cycles are computed as the following description:
The channel 1 duty cycle is set to 50% so channel 1N is set to 50%.
The channel 2 duty cycle is set to 25% so channel 2N is set to 75%.
The channel 3 duty cycle is set to 12.5% so channel 3N is set to 87.5%.
The Timer pulse is calculated as follows:
- ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100
A dead time equal to 11/SystemCoreClock is inserted between the different
complementary signals, and the Lock level 1 is selected.
The break Polarity is used at High level.
The TIM1 waveforms can be displayed using an oscilloscope.
@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.
@par Directory contents
- TIM/TIM_ComplementarySignals/Inc/stm32f2xx_hal_conf.h HAL configuration file
- TIM/TIM_ComplementarySignals/Inc/stm32f2xx_it.h Interrupt handlers header file
- TIM/TIM_ComplementarySignals/Inc/main.h Main program header file
- TIM/TIM_ComplementarySignals/Src/stm32f2xx_it.c Interrupt handlers
- TIM/TIM_ComplementarySignals/Src/main.c Main program
- TIM/TIM_ComplementarySignals/Src/stm32f2xx_hal_msp.c HAL MSP module
- TIM/TIM_ComplementarySignals/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 the TIM1 pins to an oscilloscope to monitor the different waveforms:
- TIM1_CH1 pin (PA.08)
- TIM1_CH1N pin (PB.13)
- TIM1_CH2 pin (PE.11)
- TIM1_CH2N pin (PB.14)
- TIM1_CH3 pin (PA.10)
- TIM1_CH3N pin (PB.15)
- Connect the TIM1 break pin TIM1_BKIN pin (PB.12) to the GND. To generate a
break event, switch this pin level from 0V to 3.3V.
@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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