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/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name : readme.txt
* Author : MCD Application Team
* Version : V2.0.1
* Date : 06/13/2008
* Description : Description of the NVIC System Handlers 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.
*******************************************************************************/
Example description
===================
This example demontrates the use of the Nested Vectored Interrupt Controller (NVIC)
and system handlers:
- Assignment of a descendant system handlers preemption priority for each system
handler:
- NMI has -1 as preemption priority
- PSV has 0 preemption priority
- SVCall has 1 preemption priority
- SysTick has 2 preemption priority
- Configuration of SysTick timer to generate an interrupt on each end of count
- In the Systick handler routine: a LED1 toggle each 1s and the SVC instruction
is executed. This will activate the SVCall handler to preempt the current instruction
stream. In the SVCall handler routine, a led connected to LED2 pin is toggling and the
pending bit of the PSV handler is set by software.
The PSV which has a higher preemption priority will preempt the SVCall handler and
will toggle a LED3. Also, in this handler routine, the NMI pending bit is set and
the NMI handler is activated and the LED4 is toggling.
Directory contents
==================
platform_config.h Evaluation board specific configuration file
stm32f10x_conf.h Library Configuration file
stm32f10x_it.c Interrupt handlers
stm32f10x_it.h Interrupt handlers header file
main.c Main program
Hardware environment
====================
This example runs on STMicroelectronics STM3210B-EVAL and STM3210E-EVAL evaluation
boards and can be easily tailored to any other hardware.
To select the STMicroelectronics evaluation board used to run the example, uncomment
the corresponding line in platform_config.h file.
+ STM3210B-EVAL
- Use LD1, LD2, LD3 and LD4 leds connected respectively to PC.06, PC.07, PC.08
and PC.09 pins
+ STM3210E-EVAL
- Use LD1, LD2, LD3 and LD4 leds connected respectively to PF.06, PF0.7, PF.08
and PF.09 pins
How to use it
=============
In order to make the program work, you must do the following :
- Create a project and setup all your toolchain's start-up files
- Compile the directory content files and required Library files :
+ stm32f10x_lib.c
+ stm32f10x_systick.c
+ stm32f10x_gpio.c
+ stm32f10x_rcc.c
+ stm32f10x_nvic.c
+ stm32f10x_flash.c
- Link all compiled files and load your image into target memory
- Run the example
******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE******
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