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authorTrygve Laugstøl <trygvis@inamo.no>2017-01-25 22:24:18 +0100
committerTrygve Laugstøl <trygvis@inamo.no>2017-01-25 22:29:25 +0100
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-/**
- @page IWDG_Reset IWDG Reset example
-
- @verbatim
- ******************** (C) COPYRIGHT 2011 STMicroelectronics *******************
- * @file IWDG/IWDG_Reset/readme.txt
- * @author MCD Application Team
- * @version V3.5.0
- * @date 08-April-2011
- * @brief Description of the IWDG Reset 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 update at regular period the IWDG reload counter and
-how to simulate a software fault generating an MCU IWDG reset on expiry of a
-programmed time period.
-
-The IWDG timeout is set to 250 ms (the timeout may varies due to LSI frequency
-dispersion).
-
-First, the TIM5 timer is configured to measure the LSI frequency as the
-LSI is internally connected to TIM5 CH4, in order to adjust the IWDG clock.
-
-The LSI measurement using the TIM5 is described below:
- - Configure the TIM5 to remap internally the TIM5 Channel 4 Input Capture to
- the LSI clock output.
- - Enable the TIM5 Input Capture interrupt: after one cycle of LSI clock, the
- period value is stored in a variable and compared to the HCLK clock to get
- its real value.
-
-@note The LSI is internally connected to TIM5 IC4 only on STM32F10x Connectivity
- line, High-Density Value line, High-Density and XL-Density Devices.
- When using other devices, you should comment the "#define LSI_TIM_MEASURE"
- in main.c file and in this case the LSI frequency is set by default to 40KHz.
-
-Then, the IWDG reload counter is configured to obtain 240ms according to the
-measured LSI frequency.
-
-The IWDG reload counter is refreshed each 240ms in the main program infinite loop
-to prevent a IWDG reset.
-LED2 is also toggled each 240ms indicating that the program is running.
-
-An EXTI Line is connected to a GPIO pin, and configured to generate an interrupt
-on the rising edge of the signal.
-
-The EXTI Line is used to simulate a software failure: once the EXTI Line event
-occurs, by pressing the Key push-button, the corresponding interrupt is served.
-In the ISR, a write to invalid address generates a Hardfault exception containing
-an infinite loop and preventing to return to main program (the IWDG reload counter
-is not refreshed).
-As a result, when the IWDG counter reaches 00h, the IWDG reset occurs.
-If the IWDG reset is generated, after the system resumes from reset, LED1 turns on.
-
-If the EXTI Line event does not occur, the IWDG counter is indefinitely refreshed
-in the main program infinite loop, and there is no IWDG reset.
-
-
-In this example the system clock is set to 24 MHz on Value line devices and to
-72MHz on other devices.
-
-@note The IWDG Counter can be only written when the RVU flag is reset.
- In this example, as the SysTick period is too higher than the IWDG Counter
- Update timing (5 Cycles 40KHz RC), the Reload Value Update "RVU" flag is
- not checked before reloading the counter.
-
-@par Directory contents
-
- - IWDG/IWDG_Reset/stm32f10x_conf.h Library Configuration file
- - IWDG/IWDG_Reset/stm32f10x_it.c Interrupt handlers
- - IWDG/IWDG_Reset/stm32f10x_it.h Header for stm32f10x_it.c
- - IWDG/IWDG_Reset/main.c Main program
- - IWDG/IWDG_Reset/system_stm32f10x.c STM32F10x system source file
-
-@par Hardware and Software environment
-
- - This example runs on STM32F10x Connectivity line, High-Density, High-Density
- Value line, Medium-Density, XL-Density, High-Density Value line, Medium-Density
- Value line, Low-Density and Low-Density Value line Devices.
-
- - This example has been tested with STMicroelectronics STM32100E-EVAL (High-Density
- Value line), STM32100B-EVAL (Medium-Density Value line), STM3210C-EVAL
- (Connectivity line), STM3210E-EVAL (High-Density and XL-Density), STM32100E-EVAL
- (High-Density Value line) and STM3210B-EVAL (Medium-Density) evaluation
- boards and can be easily tailored to any other supported device and development
- board.
- To select the STMicroelectronics evaluation board used to run the example,
- uncomment the corresponding line in stm32_eval.h file (under Utilities\STM32_EVAL)
-
- - STM32100E-EVAL Set-up
- - Use LD1 and LD2 leds connected respectively to PF.06 and PF.07 pins
- - Use the KEY push button connected to PG.08 pin (EXTI Line8).
-
- - STM32100B-EVAL Set-up
- - Use LD1 and LD2 leds connected respectively to PC.06 and PC.07 pins
- - Use the KEY push button connected to PB.09 pin (EXTI Line9).
-
- - STM3210C-EVAL Set-up
- - Use LD1 and LD2 connected respectively to PD.07 and PD.13 pins
- - Use the Key push-button connected to pin PB.09 (EXTI Line9).
-
- - STM3210E-EVAL Set-up
- - Use LD1 and LD2 leds connected respectively to PF.06 and PF.07 pins
- - Use the KEY push button connected to PG.08 pin (EXTI Line8).
-
- - STM3210B-EVAL Set-up
- - Use LD1 and LD2 leds connected respectively to PC.06 and PC.07 pins
- - Use the KEY push button connected to PB.09 pin (EXTI Line9).
-
-
-@par How to use it ?
-
-In order to make the program work, you must do the following :
- - Copy all source files from this example folder to the template folder under
- Project\STM32F10x_StdPeriph_Template
- - Open your preferred toolchain
- - Rebuild all files and load your image into target memory
- - Link all compiled files and load your image into target memory
- - Run the example in standalone mode (without debugger connection)
-
-@note
- - Low-density Value line devices are STM32F100xx microcontrollers where the
- Flash memory density ranges between 16 and 32 Kbytes.
- - Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx
- microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes.
- - Medium-density Value line devices are STM32F100xx microcontrollers where
- the Flash memory density ranges between 64 and 128 Kbytes.
- - Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx
- microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
- - High-density Value line devices are STM32F100xx microcontrollers where
- the Flash memory density ranges between 256 and 512 Kbytes.
- - High-density devices are STM32F101xx and STM32F103xx microcontrollers where
- the Flash memory density ranges between 256 and 512 Kbytes.
- - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where
- the Flash memory density ranges between 512 and 1024 Kbytes.
- - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers.
-
- * <h3><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h3>
- */