/**
@page TIM_DMA TIM DMA example
@verbatim
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
* @file TIM/TIM_DMA/readme.txt
* @author MCD Application Team
* @brief Description of the TIM DMA example.
******************************************************************************
* @attention
*
* Copyright (c) 2016 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
Use of the DMA with TIMER Update request
to transfer data from memory to TIMER Capture Compare Register 3 (TIM1_CCR3).
The following configuration values are used in this example:
- TIM1CLK = SystemCoreClock
- Counter repetition = 3
- Prescaler = 0
- TIM1 counter clock = SystemCoreClock
- SystemCoreClock is set to 64 MHz for STM32F1xx
The objective is to configure TIM1 channel 3 to generate complementary PWM
(Pulse Width Modulation) signal with a frequency equal to 17.57 KHz, and a variable
duty cycle that is changed by the DMA after a specific number of Update DMA request.
The number of this repetitive requests is defined by the TIM1 Repetition counter,
each 4 Update Requests, the TIM1 Channel 3 Duty Cycle changes to the next new
value defined by the aCCValue_Buffer.
The PWM waveform 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)
@note The application need to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
@par Directory contents
- TIM/TIM_DMA/Inc/stm32f1xx_hal_conf.h HAL configuration file
- TIM/TIM_DMA/Inc/stm32f1xx_it.h Interrupt handlers header file
- TIM/TIM_DMA/Inc/main.h Header for main.c module
- TIM/TIM_DMA/Src/stm32f1xx_it.c Interrupt handlers
- TIM/TIM_DMA/Src/main.c Main program
- TIM/TIM_DMA/Src/stm32f1xx_hal_msp.c HAL MSP file
- TIM/TIM_DMA/Src/system_stm32f1xx.c STM32F1xx system source file
@par Hardware and Software environment
- This example runs on STM32F103RB devices.
- In this example, the clock is set to 64 MHz.
- This example has been tested with STMicroelectronics STM32F103RB-Nucleo
board and can be easily tailored to any other supported device
and development board.
- STM32F103RB-Nucleo Set-up
- Connect the TIM1 pin to an oscilloscope to monitor the different waveforms:
- TIM1 CH3 (PA.10)
@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
*/
42472d601c