These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
PWM/Match_Interrupt/abstract.h
- Committer:
- frank26080115
- Date:
- 2011-03-20
- Revision:
- 0:bf7b9fba3924
File content as of revision 0:bf7b9fba3924:
******************** (C) COPYRIGHT 2010 NXPSemiconductors ******************* * @file PWM\Match_Interrupt\abstract.txt * @author NXP MCU SW Application Team * @version 2.0 * @date * @brief Description of the MCPWM Match Interrupt 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 use PWM Match function in interrupt mode. Process: This program illustrates the PWM signal on 6 Channels in single edge mode Peripheral clock for PWM: PWM_PCLK = CCLK / 4 = 72MHz/4 = 18MHz and there is no prescale for PWM. The PWM timer/counter clock is at 18MHz. The base rate is set to 256 The base PWM frequency is at 18MHz/256 = 70.312 KHz (Period = ~14.22 microsecond) Each PWM channel (1 to 6) will be configured as following: + PWM1.1 = (10/256) (period = 0.56 microsecond) (P2.0) + PWM1.2 = (20/256) (period = 1.11 microsecond) (P2.1) + PWM1.3 = (30/256) (period = 1.67 microsecond) (P2.2) + PWM1.4 = (40/256) (period = 2.22 microsecond) (P2.3) + PWM1.5 = (50/256) (period = 2.78 microsecond) (P2.4) + PWM1.6 = (60/256) (period = 3.33 microsecond) (P2.5) Using Oscilloscope to observe the PWM signals Here, PWM1.1 value keeps changing, it will increase by the time from 0 to 256 period and restart. Match interrupt for channel 0 is set, when timer of PWM reach to 256 (value of channel 0 match), an interrupt for matching will generate and update the value of PWM1.1, this value will be updated every 4096 match interrupts or: Period * 4096 = 14.22 * 4096 = 58,245 (microsecond) And this value will be reset to 0 after: Period * 4096 * 256 = 14,910,750.72 (microsecond) = ~15 (second) @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) pwm_match_int.c: Main program @How to run: Hardware configuration: This example was tested on: Keil MCB1700 with LPC1768 vers.1 These jumpers must be configured as following: - VDDIO: ON - VDDREGS: ON - VBUS: ON - Remain jumpers: OFF - The output signal can be observed by oscilloscope on these pins below: IAR LPC1768 KickStart vers.A These jumpers must be configured as following: - PWR_SEL: depend on power source - DBG_EN : ON - Remain jumpers: OFF PWM pin selected: Observe PWM wave signal on these pin - PWM1.1 (channel 1): P2.0 - PWM1.2 (channel 2): P2.1 - PWM1.3 (channel 3): P2.2 - PWM1.4 (channel 4): P2.3 - PWM1.5 (channel 5): P2.4 - PWM1.6 (channel 6): P2.5 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 hardware as above instruction - Step 4: Run example, Use oscilloscope to monitor the wave form (Pls see "LPC17xx Example Description" document - chapter "Examples > PWM > Match_Interrupt" for more details) @Tip: - Open \EWARM\*.eww project file to run example on IAR - Open \RVMDK\*.uvproj project file to run example on Keil