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