These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
NVIC/Priority/abstract.h
- Committer:
- frank26080115
- Date:
- 2011-03-20
- Revision:
- 0:bf7b9fba3924
File content as of revision 0:bf7b9fba3924:
******************** (C) COPYRIGHT 2010 NXPSemiconductors ******************* * @file NVIC\Priority\abstract.txt * @author NXP MCU SW Application Team * @version 2.0 * @date * @brief Description of the NVIC Priority example. ****************************************************************************** * Software that is described herein is for illustrative purposes only * which provides customers with programming information regarding the * products. This software is supplied "AS IS" without any warranties. * NXP Semiconductors assumes no responsibility or liability for the * use of the software, conveys no license or title under any patent, * copyright, or mask work right to the product. NXP Semiconductors * reserves the right to make changes in the software without * notification. NXP Semiconductors also make no representation or * warranty that such application will be suitable for the specified * use without further testing or modification. ****************************************************************************** @Example description: Purpose: This example describes how to configure NVIC priority grouping for testing tail-chaining/Late-arriving interrupt mode. Process: This example uses 2 external interrupt 0 and 3 as IRQ channels. Setting "INT_MODE" macro to chose interrupt mode test. - INT_MODE = 0: Tail-chainning interrupt testing EXT0 is assigned group-priority = 0, sub-priority = 2 EXT3 is assigned group-priority = 0, sub-priority = 1 Two IRQ channels has same group.So, new ISR can not pre-empt previous interrupt when it's executing even if new ISR has higher priority than curren ISR - INT_MODE = 1: Late-arriving interrupt testing. EXT0 is assigned group-priority = 0, sub-priority = 0 EXT3 is assigned group-priority = 1, sub-priority = 0 EXT0 has higher group-priority than EXT3, so EXT0 can pre-empt EXT3 when it's executing In this example, EXT0 occurs when pressing button INT0. EXT0 interrupt will blink LED P1.29 10 times. EXT3 occurs when turning ADC potentiometer until pull-down GPIO P0.25 pin (ADC0.2). EXT3 interrupt will blink LED P1.28 10 times @Directory contents: \EWARM: includes EWARM (IAR) project and configuration files \Keil: includes RVMDK (Keil)project and configuration files lpc17xx_libcfg.h: Library configuration file - include needed driver library for this example makefile: Example's makefile (to build with GNU toolchain) nvic_priority.c: Main program @How to run: Hardware configuration: This example was tested only on: Keil MCB1700 with LPC1768 vers.1 These jumpers must be configured as following: - VDDIO: ON - VDDREGS: ON - VBUS: ON - INT0: ON - Remain jumpers: OFF Running mode: This example can run on RAM/ROM mode. Note: If want to burn hex file to board by using Flash Magic, these jumpers need to be connected: - MCB1700 with LPC1768 ver.1: + RST: ON + ISP: ON - IAR LPC1768 KickStart vers.A: + RST_E: ON + ISP_E: ON (Please reference "LPC1000 Software Development Toolchain" - chapter 4 "Creating and working with LPC1000CMSIS project" for more information) Step to run: - Step 1: Build example. - Step 2: Burn hex file into board (if run on ROM mode) - Step 3: Configure hardward as above instruction - Step 4: Run example - Test tail-chaining interrupt mode: + Hit INT0 button to generate EXT0. Led P1.29 will blink 10 times When P1.29 is blinking, turn ADC potentiometer and see if EXT3 pre-empt EXT0 or not. When EXT0 executes finised, EXT3 will bink led P1.28 10 times. - Test late-arriving interrupt mode: + Turn ADC potentiometer to generate EXT3, Led P1.28 will blink 10 times. When P1.28 is blinking, press INT0 button to see EXT0 pre-empt EXT3. Led P1.29 will blink instead led P1.28. After P1.29 blink 10 times, P1.28 continues blink remain times. (Pls see "LPC17xx Example Description" document - chapter "Examples > NVIC > Priority" for more details) @Tip: - Open \EWARM\*.eww project file to run example on IAR - Open \RVMDK\*.uvproj project file to run example on Keil