/**
@page TIM_TimeBase Time Base example
@verbatim
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
* @file TIM/TIM_TimeBase/readme.txt
* @author MCD Application Team
* @brief Description of the TIM Time Base 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 TIM3 input clock (TIM3CLK) is set to APB1 clock (PCLK1) x2,
since APB1 prescaler is set to 4 (0x100).
TIM3CLK = PCLK1*2
PCLK1 = HCLK/2
=> TIM3CLK = PCLK1*2 = (HCLK/2)*2 = HCLK = SystemCoreClock
To get TIM3 counter clock at 10 KHz, the Prescaler is computed as following:
Prescaler = (TIM3CLK / TIM3 counter clock) - 1
Prescaler = (SystemCoreClock /10 KHz) - 1
SystemCoreClock is set to 72 MHz for STM32F1xx Devices.
The TIM3 ARR register value is equal to 10000 - 1,
Update rate = TIM3 counter clock / (Period + 1) = 1 Hz,
So the TIM3 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 PD.03 (connected to LED3 on board STM3210C-EVAL RevC)
is toggled at the following frequency: 0.5Hz.
In case of error, LED4 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 time base is always set to 1 millisecond
to have correct HAL operation.
@par Directory contents
- TIM/TIM_TimeBase/Inc/stm32f1xx_hal_conf.h HAL configuration file
- TIM/TIM_TimeBase/Inc/stm32f1xx_it.h Interrupt handlers header file
- TIM/TIM_TimeBase/Inc/main.h Header for main.c module
- TIM/TIM_TimeBase/Src/stm32f1xx_it.c Interrupt handlers
- TIM/TIM_TimeBase/Src/main.c Main program
- TIM/TIM_TimeBase/Src/stm32f1xx_hal_msp.c HAL MSP file
- TIM/TIM_TimeBase/Src/system_stm32f1xx.c STM32F1xx system source file
@par Hardware and Software environment
- This example runs on STM32F107xC devices.
- In this example, the clock is set to 72 MHz.
- This example has been tested with STMicroelectronics STM3210C-EVAL RevC
board and can be easily tailored to any other supported device
and development board.
- STM3210C-EVAL RevC Set-up
- Use LED3 connected to PD.03 pin and connect them on an oscilloscope
to show the Time Base 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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