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96 lines
4.2 KiB
Plaintext
96 lines
4.2 KiB
Plaintext
/**
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@page TIM_7PWMOutput TIM Complementary Signals example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file TIM/TIM_7PWMOutput/readme.txt
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* @author MCD Application Team
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* @brief Description of the PWM signals generation using Timer Example.
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******************************************************************************
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*
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* Copyright (c) 2017 STMicroelectronics. All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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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 to generate 7 PWM signals
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with 4 different duty cycles (50%, 37.5%, 25% and 12.5%).
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TIM1CLK is fixed to SystemCoreClock, the TIM1 Prescaler is set to 0 to have
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TIM1 counter clock = SystemCoreClock.
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The objective is to generate 7 PWM signals at 18kHz:
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- TIM1_Period = (TIM1 counter clock / 18000) - 1
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The channel 1 and channel 1N duty cycle is set to 50%
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The channel 2 and channel 2N duty cycle is set to 37.5%
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The channel 3 and channel 3N duty cycle is set to 25%
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The channel 4 duty cycle is set to 12.5%
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The Timer pulse is calculated as follows:
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- ChannelxPulse = DutyCycle * (TIM1_Period - 1) / 100
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The TIM1 waveforms can be displayed using an oscilloscope.
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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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@note The connection of the LCD reset pin to a dedicated GPIO PK7 instead of the STM32F469 NRST pin may cause residual display on LCD with applications/examples that do not require display.
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The LCD clear can be ensured by hardware through the board's power off/power on or by software calling the BSP_LCD_Reset() function.
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@par Keywords
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Timers, PWM, Duty Cycle, Waveform, Oscilloscope, Output, Signal, commutation, timing mode
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@par Directory contents
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- TIM/TIM_7PWMOutput/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- TIM/TIM_7PWMOutput/Inc/stm32f4xx_it.h Interrupt handlers header file
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- TIM/TIM_7PWMOutput/Inc/main.h Header for main.c module
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- TIM/TIM_7PWMOutput/Src/stm32f4xx_it.c Interrupt handlers
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- TIM/TIM_7PWMOutput/Src/main.c Main program
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- TIM/TIM_7PWMOutput/Src/stm32f4xx_hal_msp.c HAL MSP file
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- TIM/TIM_7PWMOutput/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 STM32F469xx/STM32F479xx devices.
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- This example has been tested and validated with STMicroelectronics STM32469I-EVAL RevC
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board and can be easily tailored to any other supported device
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and development board.
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- STM32469I-EVAL Set-up
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- Connect the TIM1 pins to an oscilloscope to monitor the different waveforms:
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- TIM1_CH1 pin (PA.08, pin 52 of CN6 connector)
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- TIM1_CH1N pin (PA.07, pin 22 of CN5 connector)
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- TIM1_CH2 pin (PA.09, pin 43 of CN6 connector)
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- TIM1_CH2N pin (PB.00, pin 52 of CN5 connector)
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- TIM1_CH3 pin (PA.10, pin 44 of CN6 connector)
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- TIM1_CH3N pin (PB.01, pin 26 of CN5 connector)
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- TIM1_CH4 pin (PA.11, pin 41 of CN6 connector)
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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 and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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