Diff: TIMER/PWMSignal/abstract.h

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+ ******************** (C) COPYRIGHT 2010 NXPSemiconductors *******************
+ * @file    TIMER\PWMSignal\abstract.txt 
+ * @author  NXP MCU SW Application Team
+ * @version 2.0
+ * @date    
+ * @brief   Description of the PWMSignal 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 TIMERs to generate PWM signals with 
+		different duty cycles.
+	Process:
+		In this case, use 4 TIMERs with match channel 0 to generate 4 PWM signal with
+		4 duty cycles:
+		- TIME0: Match channel 0 (MAT0.0 - P1.28)
+			+ HIGH state: 100 (100*100 = 10000us = 10ms)
+			+ LOW state: 700 (70ms)
+			So duty cycle = 100/800 = 12.5%
+		- TIME1: Match channel 0 (MAT1.0 - P1.22)
+			+ HIGH state: 200 (20ms)
+			+ LOW state: 600 (60ms)
+			So duty cycle = 200/800 = 25%
+		- TIMER2: Match channel 0 (MAT2.0: P0.6)
+			+ HIGH state: 300 (30ms)
+			+ LOW state: 500 (50ms)
+			So duty cycle = (300/800) = 37.5%
+		- TIMER3: Match channel 0 (MAT3.0 - P0.10)
+			+ HIGH state: 800 (80ms)
+			+ LOW state: 800 (80ms)
+			So duty cycle = (800/1600) = 50%
+		Using oscilloscope to observe these signals
+					
+@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_signal.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
+				- Remain jumpers: OFF
+			IAR LPC1768 KickStart vers.A
+				These jumpers must be configured as following:
+				- PWR_SEL: depend on power source
+				- DBG_EN : ON
+				- Remain jumpers: OFF
+				
+		Serial display configuration:(e.g: TeraTerm, Hyperterminal, Flash Magic...) 
+			– 115200bps 
+			– 8 data bit 
+			– No parity 
+			– 1 stop bit 
+			– No flow control 
+	
+	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: Connect UART0 on this board to COM port on your computer
+		- Step 4: Configure hardware and serial display as above instruction 
+		- Step 5: Run example, see the welcome screen on serial display and observe 
+				  4 signals on oscilloscope:
+				  - P1.28: duty cycle = 12.5%
+				  - P1.22: duty cycle = 25%
+				  - P0.6:  duty cycle = 37.5%
+				  - P0.10: duty cycle = 50%
+			
+		(Pls see "LPC17xx Example Description" document - chapter "Examples > TIMER > PWMSignal"
+		for more details)
+		
+@Tip:
+	- Open \EWARM\*.eww project file to run example on IAR
+	- Open \RVMDK\*.uvproj project file to run example on Keil
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