122 lines
5.0 KiB
Plaintext
122 lines
5.0 KiB
Plaintext
/**
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@page TIM_7PWM_Output TIM_7PWM_Output
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@verbatim
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******************** (C) COPYRIGHT 2009 STMicroelectronics *******************
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* @file TIM/7PWM_Output/readme.txt
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* @author MCD Application Team
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* @version V3.1.0
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* @date 06/19/2009
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* @brief Description of the TIM 7PWM_Output example.
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******************************************************************************
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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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.
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TIM1CLK is fixed to 72 MHz, the TIM1 Prescaler is equal to 0 so the TIM1 counter
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clock used is 72 MHz.
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TIM1 frequency is defined as follow:
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TIM1 frequency = TIM1CLK/(TIM1_Period + 1) = 17.57 KHz.
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The TIM1 CCR1 register value is equal to 0x7FF, so the TIM1 Channel 1 and TIM1
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Channel 1N generate a PWM signal with a frequency equal to 17.57 KHz
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and a duty cycle equal to:
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TIM1 Channel1 duty cycle = TIM1_CCR1 /( TIM1_Period + 1) = 50%.
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The TIM1 CCR2 register value is equal to 0x5FF, so the TIM1 Channel 2 and TIM1
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Channel 2N generate a PWM signal with a frequency equal to 17.57 KHz
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and a duty cycle equal to:
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TIM1 Channel2 duty cycle = TIM1_CCR2 / ( TIM1_Period + 1)= 37.5%.
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The TIM1 CCR3 register value is equal to 0x3FF, so the TIM1 Channel 3 and TIM1
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Channel 3N generate a PWM signal with a frequency equal to 17.57 KHz
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and a duty cycle equal to:
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TIM1 Channel3 duty cycle = TIM1_CCR3 / ( TIM1_Period + 1) = 25%.
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The TIM1 CCR4 register value is equal to 0x1FF, so the TIM1 Channel 4
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generate a PWM signal with a frequency equal to 17.57 KHz
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and a duty cycle equal to:
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TIM1 Channel4 duty cycle = TIM1_CCR4 / ( TIM1_Period + 1) = 12.5%.
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The TIM1 waveform can be displayed using an oscilloscope.
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@par Directory contents
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- TIM/7PWM_Output/stm32f10x_conf.h Library Configuration file
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- TIM/7PWM_Output/stm32f10x_it.c Interrupt handlers
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- TIM/7PWM_Output/stm32f10x_it.h Interrupt handlers header file
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- TIM/7PWM_Output/main.c Main program
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@par Hardware and Software environment
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- This example runs on STM32F10x Connectivity line, High-Density, Medium-Density
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and Low-Density Devices.
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- This example has been tested with STMicroelectronics STM3210C-EVAL (STM32F10x
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Connectivity line), STM3210E-EVAL (STM32F10x High-Density) and STM3210B-EVAL
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(STM32F10x Medium-Density) evaluation boards and can be easily tailored to
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any other supported device and development board.
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- STM3210C-EVAL Set-up
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- Connect the TIM1 pins(TIM1 full remapped pins) to an oscilloscope to monitor the different waveforms:
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- TIM1_CH1 pin (PE.08)
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- TIM1_CH1N pin (PE.09)
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- TIM1_CH2 pin (PE.10)
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- TIM1_CH2N pin (PE.11)
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- TIM1_CH3 pin (PE.12)
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- TIM1_CH3N pin (PE.13)
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- TIM1_CH4 pin (PE.14)
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- STM3210E-EVAL and STM3210B-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)
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- TIM1_CH1N pin (PB.13)
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- TIM1_CH2 pin (PA.09)
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- TIM1_CH2N pin (PB.14)
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- TIM1_CH3 pin (PA.10)
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- TIM1_CH3N pin (PB.15)
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- TIM1_CH4 pin (PA.11)
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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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- Create a project and setup all project configuration
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- Add the required Library files:
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- stm32f10x_gpio.c
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- stm32f10x_rcc.c
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- stm32f10x_tim.c
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- system_stm32f10x.c (under Libraries\CMSIS\Core\CM3)
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- Edit stm32f10x.h file to select the device you are working on.
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@b Tip: You can tailor the provided project template to run this example, for
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more details please refer to "stm32f10x_stdperiph_lib_um.chm" user
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manual; select "Peripheral Examples" then follow the instructions
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provided in "How to proceed" section.
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- Link all compiled files and load your image into target memory
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- Run the example
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@note
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- Low-density devices are STM32F101xx and STM32F103xx microcontrollers where
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the Flash memory density ranges between 16 and 32 Kbytes.
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- Medium-density devices are STM32F101xx and STM32F103xx microcontrollers where
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the Flash memory density ranges between 32 and 128 Kbytes.
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- High-density devices are STM32F101xx and STM32F103xx microcontrollers where
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the Flash memory density ranges between 256 and 512 Kbytes.
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- Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
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* <h3><center>© COPYRIGHT 2009 STMicroelectronics</center></h3>
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*/
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