/**
@page TIM_TimeBase Timebase example
@verbatim
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
* @file TIM/TIM_TimeBase/readme.txt
* @author MCD Application Team
* @brief Description of the TIM Timebase 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
Configuration of the TIM peripheral to generate a timebase of
one second with the corresponding interrupt request.
In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1),
since APB1 prescaler is equal to 1.
TIM2CLK = PCLK1
PCLK1 = HCLK
=> TIM2CLK = HCLK = SystemCoreClock
To get TIM2 counter clock at 10 KHz, the Prescaler is computed as following:
Prescaler = (TIM2CLK / TIM2 counter clock) - 1
Prescaler = (SystemCoreClock /10 KHz) - 1
SystemCoreClock is set to 48 MHz for STM32F0xx Devices.
The TIM2 ARR register value is equal to 10000 - 1,
Update rate = TIM2 counter clock / (Period + 1) = 1 Hz,
So the TIM2 generates an interrupt each 1 s
When the counter value reaches the auto-reload register value, the TIM update
interrupt is generated and, in the handler routine, pin PA.05 is toggled with the
following frequency: 0.5Hz
In case of error, LED2 is turned ON.
@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 need to ensure that the SysTick Timebase is always set to 1 millisecond
to have correct HAL operation.
@par Directory contents
- TIM/TIM_TimeBase/Inc/stm32f0xx_hal_conf.h HAL configuration file
- TIM/TIM_TimeBase/Inc/stm32f0xx_it.h Interrupt handlers header file
- TIM/TIM_TimeBase/Inc/main.h Header for main.c module
- TIM/TIM_TimeBase/Src/stm32f0xx_it.c Interrupt handlers
- TIM/TIM_TimeBase/Src/main.c Main program
- TIM/TIM_TimeBase/Src/stm32f0xx_hal_msp.c HAL MSP file
- TIM/TIM_TimeBase/Src/system_stm32f0xx.c STM32F0xx system source file
@par Hardware and Software environment
- This example runs on STM32F091xC devices.
- This example has been tested with STMicroelectronics STM32F091RC-Nucleo RevC
board and can be easily tailored to any other supported device
and development board.
- STM32F091RC-Nucleo RevC Set-up
- Use LED2 connected to PA.05 pin (pin 11 in CN10 connector) and connect them on an oscilloscope
to show the Timebase signal.
@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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