/**********************************************************************
* $Id$		abstract.txt 			
*//**
* @file		abstract.txt 
* @brief	Example description file
* @version	2.0
* @date		
* @author	NXP MCU SW Application Team
*
* Copyright(C) 2010, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* 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 Timer to measure a signal's frequency.
Process:
    1) Initialize UART0 and display information menu.
    2) Ask user to input frequency for a test signal.
       Configure P1.26 as CAP0.0, P0.6 as MAT2.0.
    3) Configure TIMER2 as follow:
    	- Prescale register = 1 us.
    	- Match register = 1 / ((frequency)*1us*2)
    					 = 500000 / freuqency
	- No interrupt, no stop but reset timer counter on match.
       Configure TIMER0 as follow:
    	 - Prescale register = 1 us.
	 - Capture register: channel 0, capture on rising edge, generate 
                             interrupt on capture.
    4) Configure TIMER0 ISR:
    	- Prepare 5 interrupt times, in which timer counter and prescale
          are reset, for stable.
	- After this 5 interrupt times, get the capture value, raise 
          done flag.
    5) Start TIMER0 and TIMER2.
       Wait for done flag, then calculate and print out the measure frequency 
       by:
          one cycle = capture value * 1us (as TIMER0 configuration).
          signal frequency = 1/one cycle = 1,000,000 / capture value.
	      Press c if we intend to test with other frequencies.
              TIMER0 and TIMER2 are de-initialized.

@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)
freqmeasure.c: Main program

@How to run:
Hardware configuration:		
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.
					
(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 COM1 on the Lincoln board to COM port on your computer
	- Step 4: Configure hardware and serial display as above instruction 
	- Step 5: Run example
		  Use a wire connect J2 pin 5 (P0.6) and J2 pin 17 (P1.26)
		  Use PC's terminal to select the test signal on P1.26 and see
		  the result measured frequency printed out. 
(Pls see "LPC17xx Example Description" document - chapter "Examples > TIMER > 
FreqMeasure" for more details)
		
@Tip:
	- Open \EWARM\*.eww project file to run example on IAR
	- Open \RVMDK\*.uvproj project file to run example on Keil