abstract.h

00001  ******************** (C) COPYRIGHT 2010 NXPSemiconductors *******************
00002  * @file    PWM\Dual_Edge\abstract.txt 
00003  * @author  NXP MCU SW Application Team
00004  * @version 2.0
00005  * @date    
00006  * @brief   Description of the PWM Dual_Edge example.
00007  ******************************************************************************
00008  * Software that is described herein is for illustrative purposes only
00009  * which provides customers with programming information regarding the
00010  * products. This software is supplied "AS IS" without any warranties.
00011  * NXP Semiconductors assumes no responsibility or liability for the
00012  * use of the software, conveys no license or title under any patent,
00013  * copyright, or mask work right to the product. NXP Semiconductors
00014  * reserves the right to make changes in the software without
00015  * notification. NXP Semiconductors also make no representation or
00016  * warranty that such application will be suitable for the specified
00017  * use without further testing or modification.
00018  ******************************************************************************
00019   
00020 @Example description:
00021     Purpose:
00022         This example describes how to generate PWM signal on 3 Channels in both 
00023         edge mode and single mode.
00024     Process:
00025         This program illustrates the PWM signal on 3 Channels in both edge mode
00026         and single mode.
00027         Peripheral clock for PWM: PWM_PCLK = CCLK / 4 = 72MHz/4 = 18MHz and there is no
00028         prescale for PWM. The PWM timer/counter clock is at 18MHz. The base rate is set to 100
00029         The base PWM frequency is at 18MHz/100 = 180 KHz.
00030         Each PWM channel will be configured as following:
00031             - Channel 2: Double Edge (P2.1)
00032             - Channel 4: Double Edge (P2.5)
00033             - Channel 5: Single Edge (P2.6)
00034         The Match register values are as follows:
00035             - MR0 = 100 (PWM rate)
00036             - MR1 = 41, MR2 = 78 (PWM2 output)
00037             - MR3 = 53, MR4 = 27 (PWM4 output)
00038             - MR5 = 65 (PWM5 output)
00039         PWM Duty on each PWM channel:
00040             - Channel 2: Set by match 1, Reset by match 2.
00041             - Channel 4: Set by match 3, Reset by match 4.
00042             - Channel 5: Set by match 0, Reset by match 5.
00043         Using Oscilloscope to observe the PWM signals   
00044 
00045 @Directory contents:
00046     \EWARM: includes EWARM (IAR) project and configuration files
00047     \Keil:  includes RVMDK (Keil)project and configuration files
00048      
00049     lpc17xx_libcfg.h: Library configuration file - include needed driver library for this example 
00050     makefile: Example's makefile (to build with GNU toolchain)
00051     pwm_dual_edge.c: Main program
00052 
00053 @How to run:
00054     Hardware configuration:     
00055         This example was tested on:
00056             Keil MCB1700 with LPC1768 vers.1
00057                 These jumpers must be configured as following:
00058                 - VDDIO: ON
00059                 - VDDREGS: ON 
00060                 - VBUS: ON
00061                 - Remain jumpers: OFF
00062             IAR LPC1768 KickStart vers.A
00063                 These jumpers must be configured as following:
00064                 - PWR_SEL: depend on power source
00065                 - DBG_EN : ON
00066                 - Remain jumpers: OFF
00067             
00068             PWM Pin selected:
00069                 Observe PWM wave signal on these pin
00070                 - PWM1.2 (channel 2): P2.1
00071                 - PWM1.4 (channel 4): P2.3
00072                 - PWM1.5 (channel 5): P2.4
00073                                 
00074     Running mode:
00075         This example can run on RAM/ROM mode.
00076                     
00077         Note: If want to burn hex file to board by using Flash Magic, these jumpers need
00078         to be connected:
00079             - MCB1700 with LPC1768 ver.1:
00080                 + RST: ON
00081                 + ISP: ON
00082             - IAR LPC1768 KickStart vers.A:
00083                 + RST_E: ON
00084                 + ISP_E: ON
00085         
00086         (Please reference "LPC1000 Software Development Toolchain" - chapter 4 "Creating and working with
00087         LPC1000CMSIS project" for more information)
00088     
00089     Step to run:
00090         - Step 1: Build example.
00091         - Step 2: Burn hex file into board (if run on ROM mode)
00092         - Step 3: Configure hardware as above instruction 
00093         - Step 4: Run example, Use oscilloscope to monitor the wave form
00094         
00095         (Pls see "LPC17xx Example Description" document - chapter "Examples > PWM > Dual_Edge"
00096         for more details)
00097         
00098 @Tip:
00099     - Open \EWARM\*.eww project file to run example on IAR
00100     - Open \RVMDK\*.uvproj project file to run example on Keil