These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
TIMER/FreqMeasure/abstract.h
- Committer:
- frank26080115
- Date:
- 2011-03-20
- Revision:
- 0:bf7b9fba3924
File content as of revision 0:bf7b9fba3924:
******************** (C) COPYRIGHT 2010 NXPSemiconductors ******************* * @file TIMER\FreqMeasure\abstract.txt * @author NXP MCU SW Application Team * @version 2.0 * @date * @brief Description of the TIMER Match example in generating * 2 different frequency signals. ****************************************************************************** * 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 ESC 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: 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 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 Use a wire connect P0.6 and P1.26 Use PC's terminal to select the test signal on P0.26 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