These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
Diff: TIMER/FreqMeasure/abstract.h
- Revision:
- 0:bf7b9fba3924
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TIMER/FreqMeasure/abstract.h Sun Mar 20 05:38:56 2011 +0000 @@ -0,0 +1,107 @@ + ******************** (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 \ No newline at end of file