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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 NVIC_IRQ_Mask NVIC IRQ Mask example
-
- @verbatim
- ******************** (C) COPYRIGHT 2011 STMicroelectronics *******************
- * @file NVIC/IRQ_Mask/readme.txt
- * @author MCD Application Team
- * @version V3.5.0
- * @date 08-April-2011
- * @brief Description of the NVIC IRQ Mask 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 demontrates the use of the Nested Vectored Interrupt Controller (NVIC)
-IRQ Channels configuration and how to mask/activate different IRQs:
-
-- Configuration of 3 TIM (TIM2..TIM4)timers to generate an interrupt on each
- counter update event.
-
-- The three timers are linked to their correspondant Update IRQ channel.
-
-- Assignment of a ascendant IRQ priority for each IRQ channel :
- - TIM2 has a preemption priority of 0
- - TIM3 has a preemption priority of 1
- - TIM4 has a preemption priority of 2
-- In each interrupt routine:
- - TIM2 toggles a LED1 each 1s
- - TIM3 toggles a LED2 each 2s
- - TIM4 toggles a LED3 each 3s
-
-- The KEY and WAKEUP buttons are used to boost the execution priority as follows:
-
- - The KEY button is used in GPIO mode and at each KEY button press, the execution
- priority is raised to 0 and turn LED4 ON. This prevents all exceptions with
- configurable priority from activating, other than through the HardFault fault
- escalation mechanism. As consequence, all LEDs stop toggling as TIM2, TIM3
- and TIM4 IRQs are prevented from activation.
-
- Pressing again the KEY button will release the priority boosting, turn LED4
- OFF and will allow all exceptions with configurable priority to be activated
- and TIM2, TIM3 and TIM4 can be generated again and the LEDs restart toggling.
-
- This execution priority is made using the CMSIS functions "__disable_irq()"
- and "__enable_irq()".
- These two functions are managing the Cortex-M3 PRIMASK special register.
-
- - The WAKEUP button is used in EXTI mode and at each WAKEUP button press, the execution
- priority is masked to 0x40 using the BASEPRI register.
- A non-zero value will act as a priority mask, affecting the execution priority
- when the priority defined by BASEPRI is the same or higher than the current
- executing priority.
- As consequence, LED2 and LED3 stop toggling as TIM3 and TIM4 IRQs are
- prevented from activation.
- Pressing again the WAKEUP button will configure the BASEPRI register to 0,
- thus it has no effect on the current priority and TIM3 and TIM4 can be
- generated again and LED2 and LED3 restart toggling.
-
- This execution priority is made using the CMSIS functions "__set_BASEPRI()".
- This function is managing the Cortex-M3 BASEPRI special register.
- Setting the BASEPRI register has no effect when the execution priority is
- raised to 0 using the "__disable_irq()" function.
-
-@note These mechanisms only affect the group priority. They have no effect on
- the sub-priority. The sub-priority is only used to sort pending exception
- priorities, and does not affect active exceptions.
-
-@par Directory contents
-
- - NVIC/IRQ_Mask/stm32f10x_conf.h Library Configuration file
- - NVIC/IRQ_Mask/stm32f10x_it.c Interrupt handlers
- - NVIC/IRQ_Mask/stm32f10x_it.h Interrupt handlers header file
- - NVIC/IRQ_Mask/main.c Main program
- - NVIC/IRQ_Mask/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, 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) 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 LED1, LED2, LED3 and LED4 leds connected respectively to PF.06, PF.07
- PF.08 and PF.09
- - Use the Key push-button connected to pin PG.08 (EXTI Line8).
- - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
- @note the jumper JP4 must be not fit to be able to use the Wakeup push-button
-
- - STM32100B-EVAL Set-up
- - Use LED1, LED2, LED3 and LED4 leds connected respectively to PC.06, PC.07,
- PC.08 and PC.09
- - Use the Key push-button connected to pin PB.09 (EXTI Line9).
- - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
-
- - STM3210C-EVAL Set-up
- - Use LED1, LED2, LED3 and LED4 connected respectively to PD.07, PD.13, PF.03
- and PD.04 pins
- - Use the Key push-button connected to pin PB.09 (EXTI Line9).
- - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
- @note Make sure that the Jumper 14 is in position 2<->3.
-
- - STM3210E-EVAL Set-up
- - Use LED1, LED2, LED3 and LED4 leds connected respectively to PF.06, PF.07
- PF.08 and PF.09
- - Use the Key push-button connected to pin PG.08 (EXTI Line8).
- - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
- @note the jumper JP4 must be not fit to be able to use the Wakeup push-button
-
- - STM3210B-EVAL Set-up
- - Use LED1, LED2, LED3 and LED4 leds connected respectively to PC.06, PC.07,
- PC.08 and PC.09
- - Use the Key push-button connected to pin PB.09 (EXTI Line9).
- - Use the Wakeup push-button connected to pin PA.00 (EXTI Line0).
-
-@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
- - Run the example
-
-@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>
- */