Frank 26080115
These are the examples provided for [[/users/frank26080115/libraries/LPC1700CMSIS_Lib/]] Note, the entire "program" is not compilable!
PWM/Match_Interrupt/abstract.h@0:bf7b9fba3924, 2011-03-20 (annotated)
- Committer:
- frank26080115
- Date:
- Sun Mar 20 05:38:56 2011 +0000
- Revision:
- 0:bf7b9fba3924
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| frank26080115 | 0:bf7b9fba3924 | 1 | ******************** (C) COPYRIGHT 2010 NXPSemiconductors ******************* |
| frank26080115 | 0:bf7b9fba3924 | 2 | * @file PWM\Match_Interrupt\abstract.txt |
| frank26080115 | 0:bf7b9fba3924 | 3 | * @author NXP MCU SW Application Team |
| frank26080115 | 0:bf7b9fba3924 | 4 | * @version 2.0 |
| frank26080115 | 0:bf7b9fba3924 | 5 | * @date |
| frank26080115 | 0:bf7b9fba3924 | 6 | * @brief Description of the MCPWM Match Interrupt example. |
| frank26080115 | 0:bf7b9fba3924 | 7 | ****************************************************************************** |
| frank26080115 | 0:bf7b9fba3924 | 8 | * Software that is described herein is for illustrative purposes only |
| frank26080115 | 0:bf7b9fba3924 | 9 | * which provides customers with programming information regarding the |
| frank26080115 | 0:bf7b9fba3924 | 10 | * products. This software is supplied "AS IS" without any warranties. |
| frank26080115 | 0:bf7b9fba3924 | 11 | * NXP Semiconductors assumes no responsibility or liability for the |
| frank26080115 | 0:bf7b9fba3924 | 12 | * use of the software, conveys no license or title under any patent, |
| frank26080115 | 0:bf7b9fba3924 | 13 | * copyright, or mask work right to the product. NXP Semiconductors |
| frank26080115 | 0:bf7b9fba3924 | 14 | * reserves the right to make changes in the software without |
| frank26080115 | 0:bf7b9fba3924 | 15 | * notification. NXP Semiconductors also make no representation or |
| frank26080115 | 0:bf7b9fba3924 | 16 | * warranty that such application will be suitable for the specified |
| frank26080115 | 0:bf7b9fba3924 | 17 | * use without further testing or modification. |
| frank26080115 | 0:bf7b9fba3924 | 18 | ****************************************************************************** |
| frank26080115 | 0:bf7b9fba3924 | 19 | |
| frank26080115 | 0:bf7b9fba3924 | 20 | @Example description: |
| frank26080115 | 0:bf7b9fba3924 | 21 | Purpose: |
| frank26080115 | 0:bf7b9fba3924 | 22 | This example describes how to use PWM Match function in interrupt mode. |
| frank26080115 | 0:bf7b9fba3924 | 23 | Process: |
| frank26080115 | 0:bf7b9fba3924 | 24 | This program illustrates the PWM signal on 6 Channels in single edge mode |
| frank26080115 | 0:bf7b9fba3924 | 25 | Peripheral clock for PWM: PWM_PCLK = CCLK / 4 = 72MHz/4 = 18MHz and there is no |
| frank26080115 | 0:bf7b9fba3924 | 26 | prescale for PWM. The PWM timer/counter clock is at 18MHz. The base rate is set to 256 |
| frank26080115 | 0:bf7b9fba3924 | 27 | The base PWM frequency is at 18MHz/256 = 70.312 KHz (Period = ~14.22 microsecond) |
| frank26080115 | 0:bf7b9fba3924 | 28 | Each PWM channel (1 to 6) will be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 29 | + PWM1.1 = (10/256) (period = 0.56 microsecond) (P2.0) |
| frank26080115 | 0:bf7b9fba3924 | 30 | + PWM1.2 = (20/256) (period = 1.11 microsecond) (P2.1) |
| frank26080115 | 0:bf7b9fba3924 | 31 | + PWM1.3 = (30/256) (period = 1.67 microsecond) (P2.2) |
| frank26080115 | 0:bf7b9fba3924 | 32 | + PWM1.4 = (40/256) (period = 2.22 microsecond) (P2.3) |
| frank26080115 | 0:bf7b9fba3924 | 33 | + PWM1.5 = (50/256) (period = 2.78 microsecond) (P2.4) |
| frank26080115 | 0:bf7b9fba3924 | 34 | + PWM1.6 = (60/256) (period = 3.33 microsecond) (P2.5) |
| frank26080115 | 0:bf7b9fba3924 | 35 | Using Oscilloscope to observe the PWM signals |
| frank26080115 | 0:bf7b9fba3924 | 36 | Here, PWM1.1 value keeps changing, it will increase by the time from 0 to 256 period |
| frank26080115 | 0:bf7b9fba3924 | 37 | and restart. Match interrupt for channel 0 is set, when timer of PWM reach to 256 |
| frank26080115 | 0:bf7b9fba3924 | 38 | (value of channel 0 match), an interrupt for matching will generate and update the |
| frank26080115 | 0:bf7b9fba3924 | 39 | value of PWM1.1, this value will be updated every 4096 match interrupts or: |
| frank26080115 | 0:bf7b9fba3924 | 40 | Period * 4096 = 14.22 * 4096 = 58,245 (microsecond) |
| frank26080115 | 0:bf7b9fba3924 | 41 | And this value will be reset to 0 after: |
| frank26080115 | 0:bf7b9fba3924 | 42 | Period * 4096 * 256 = 14,910,750.72 (microsecond) = ~15 (second) |
| frank26080115 | 0:bf7b9fba3924 | 43 | |
| frank26080115 | 0:bf7b9fba3924 | 44 | @Directory contents: |
| frank26080115 | 0:bf7b9fba3924 | 45 | \EWARM: includes EWARM (IAR) project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 46 | \Keil: includes RVMDK (Keil)project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 47 | |
| frank26080115 | 0:bf7b9fba3924 | 48 | lpc17xx_libcfg.h: Library configuration file - include needed driver library for this example |
| frank26080115 | 0:bf7b9fba3924 | 49 | makefile: Example's makefile (to build with GNU toolchain) |
| frank26080115 | 0:bf7b9fba3924 | 50 | pwm_match_int.c: Main program |
| frank26080115 | 0:bf7b9fba3924 | 51 | |
| frank26080115 | 0:bf7b9fba3924 | 52 | @How to run: |
| frank26080115 | 0:bf7b9fba3924 | 53 | Hardware configuration: |
| frank26080115 | 0:bf7b9fba3924 | 54 | This example was tested on: |
| frank26080115 | 0:bf7b9fba3924 | 55 | Keil MCB1700 with LPC1768 vers.1 |
| frank26080115 | 0:bf7b9fba3924 | 56 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 57 | - VDDIO: ON |
| frank26080115 | 0:bf7b9fba3924 | 58 | - VDDREGS: ON |
| frank26080115 | 0:bf7b9fba3924 | 59 | - VBUS: ON |
| frank26080115 | 0:bf7b9fba3924 | 60 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 61 | - The output signal can be observed by oscilloscope on these pins below: |
| frank26080115 | 0:bf7b9fba3924 | 62 | IAR LPC1768 KickStart vers.A |
| frank26080115 | 0:bf7b9fba3924 | 63 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 64 | - PWR_SEL: depend on power source |
| frank26080115 | 0:bf7b9fba3924 | 65 | - DBG_EN : ON |
| frank26080115 | 0:bf7b9fba3924 | 66 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 67 | |
| frank26080115 | 0:bf7b9fba3924 | 68 | PWM pin selected: |
| frank26080115 | 0:bf7b9fba3924 | 69 | Observe PWM wave signal on these pin |
| frank26080115 | 0:bf7b9fba3924 | 70 | - PWM1.1 (channel 1): P2.0 |
| frank26080115 | 0:bf7b9fba3924 | 71 | - PWM1.2 (channel 2): P2.1 |
| frank26080115 | 0:bf7b9fba3924 | 72 | - PWM1.3 (channel 3): P2.2 |
| frank26080115 | 0:bf7b9fba3924 | 73 | - PWM1.4 (channel 4): P2.3 |
| frank26080115 | 0:bf7b9fba3924 | 74 | - PWM1.5 (channel 5): P2.4 |
| frank26080115 | 0:bf7b9fba3924 | 75 | - PWM1.6 (channel 6): P2.5 |
| frank26080115 | 0:bf7b9fba3924 | 76 | |
| frank26080115 | 0:bf7b9fba3924 | 77 | |
| frank26080115 | 0:bf7b9fba3924 | 78 | Running mode: |
| frank26080115 | 0:bf7b9fba3924 | 79 | This example can run on RAM/ROM mode. |
| frank26080115 | 0:bf7b9fba3924 | 80 | |
| frank26080115 | 0:bf7b9fba3924 | 81 | Note: If want to burn hex file to board by using Flash Magic, these jumpers need |
| frank26080115 | 0:bf7b9fba3924 | 82 | to be connected: |
| frank26080115 | 0:bf7b9fba3924 | 83 | - MCB1700 with LPC1768 ver.1: |
| frank26080115 | 0:bf7b9fba3924 | 84 | + RST: ON |
| frank26080115 | 0:bf7b9fba3924 | 85 | + ISP: ON |
| frank26080115 | 0:bf7b9fba3924 | 86 | - IAR LPC1768 KickStart vers.A: |
| frank26080115 | 0:bf7b9fba3924 | 87 | + RST_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 88 | + ISP_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 89 | |
| frank26080115 | 0:bf7b9fba3924 | 90 | (Please reference "LPC1000 Software Development Toolchain" - chapter 4 "Creating and working with |
| frank26080115 | 0:bf7b9fba3924 | 91 | LPC1000CMSIS project" for more information) |
| frank26080115 | 0:bf7b9fba3924 | 92 | |
| frank26080115 | 0:bf7b9fba3924 | 93 | Step to run: |
| frank26080115 | 0:bf7b9fba3924 | 94 | - Step 1: Build example. |
| frank26080115 | 0:bf7b9fba3924 | 95 | - Step 2: Burn hex file into board (if run on ROM mode) |
| frank26080115 | 0:bf7b9fba3924 | 96 | - Step 3: Configure hardware as above instruction |
| frank26080115 | 0:bf7b9fba3924 | 97 | - Step 4: Run example, Use oscilloscope to monitor the wave form |
| frank26080115 | 0:bf7b9fba3924 | 98 | |
| frank26080115 | 0:bf7b9fba3924 | 99 | (Pls see "LPC17xx Example Description" document - chapter "Examples > PWM > Match_Interrupt" |
| frank26080115 | 0:bf7b9fba3924 | 100 | for more details) |
| frank26080115 | 0:bf7b9fba3924 | 101 | |
| frank26080115 | 0:bf7b9fba3924 | 102 | @Tip: |
| frank26080115 | 0:bf7b9fba3924 | 103 | - Open \EWARM\*.eww project file to run example on IAR |
| frank26080115 | 0:bf7b9fba3924 | 104 | - Open \RVMDK\*.uvproj project file to run example on Keil |