Frank 26080115
/
LPC1700CMSIS_Examples
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DAC/DMA/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 DAC\DMA\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 DAC DMA 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 DMA to transfer data to DAC peripheral |
| frank26080115 | 0:bf7b9fba3924 | 23 | Process: |
| frank26080115 | 0:bf7b9fba3924 | 24 | DAC will be initialized with maximum current is 700uA. This allows a maximum update rate of 1Mhz |
| frank26080115 | 0:bf7b9fba3924 | 25 | Formula for ouput voltage on AOUT is: |
| frank26080115 | 0:bf7b9fba3924 | 26 | AOUT = VALUE x ((Vrefp - Vrefn)/1024)+Vrefn |
| frank26080115 | 0:bf7b9fba3924 | 27 | in which: |
| frank26080115 | 0:bf7b9fba3924 | 28 | - Vrefp: tied to VDD(3.3V) |
| frank26080115 | 0:bf7b9fba3924 | 29 | - Vrefn: tied to Vss |
| frank26080115 | 0:bf7b9fba3924 | 30 | |
| frank26080115 | 0:bf7b9fba3924 | 31 | GPDMA channel 0 is configured in this example. |
| frank26080115 | 0:bf7b9fba3924 | 32 | GPDMA channel 0 will tranfer "dac_value" to DAC peripheral. DAC updated values have range |
| frank26080115 | 0:bf7b9fba3924 | 33 | from 0 to 0x3FF. So AOUT ouput voltage will change from: Vss to VDD. |
| frank26080115 | 0:bf7b9fba3924 | 34 | |
| frank26080115 | 0:bf7b9fba3924 | 35 | Observe AOUT(P0.26) signal by oscilloscope. |
| frank26080115 | 0:bf7b9fba3924 | 36 | |
| frank26080115 | 0:bf7b9fba3924 | 37 | @Directory contents: |
| frank26080115 | 0:bf7b9fba3924 | 38 | \EWARM: includes EWARM (IAR) project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 39 | \Keil: includes RVMDK (Keil)project and configuration files |
| frank26080115 | 0:bf7b9fba3924 | 40 | |
| frank26080115 | 0:bf7b9fba3924 | 41 | lpc17xx_libcfg.h: Library configuration file - include needed driver library for this example |
| frank26080115 | 0:bf7b9fba3924 | 42 | makefile: Example's makefile (to build with GNU toolchain) |
| frank26080115 | 0:bf7b9fba3924 | 43 | dac_dma.c: Main program |
| frank26080115 | 0:bf7b9fba3924 | 44 | |
| frank26080115 | 0:bf7b9fba3924 | 45 | @How to run: |
| frank26080115 | 0:bf7b9fba3924 | 46 | Hardware configuration: |
| frank26080115 | 0:bf7b9fba3924 | 47 | This example was tested on: |
| frank26080115 | 0:bf7b9fba3924 | 48 | Keil MCB1700 with LPC1768 vers.1 |
| frank26080115 | 0:bf7b9fba3924 | 49 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 50 | - VDDIO: ON |
| frank26080115 | 0:bf7b9fba3924 | 51 | - VDDREGS: ON |
| frank26080115 | 0:bf7b9fba3924 | 52 | - VBUS: ON |
| frank26080115 | 0:bf7b9fba3924 | 53 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 54 | IAR LPC1768 KickStart vers.A |
| frank26080115 | 0:bf7b9fba3924 | 55 | These jumpers must be configured as following: |
| frank26080115 | 0:bf7b9fba3924 | 56 | - PWR_SEL: depend on power source |
| frank26080115 | 0:bf7b9fba3924 | 57 | - DBG_EN : ON |
| frank26080115 | 0:bf7b9fba3924 | 58 | - Remain jumpers: OFF |
| frank26080115 | 0:bf7b9fba3924 | 59 | |
| frank26080115 | 0:bf7b9fba3924 | 60 | |
| frank26080115 | 0:bf7b9fba3924 | 61 | Running mode: |
| frank26080115 | 0:bf7b9fba3924 | 62 | This example can run on RAM/ROM mode. |
| frank26080115 | 0:bf7b9fba3924 | 63 | |
| frank26080115 | 0:bf7b9fba3924 | 64 | Note: If want to burn hex file to board by using Flash Magic, these jumpers need |
| frank26080115 | 0:bf7b9fba3924 | 65 | to be connected: |
| frank26080115 | 0:bf7b9fba3924 | 66 | - MCB1700 with LPC1768 ver.1: |
| frank26080115 | 0:bf7b9fba3924 | 67 | + RST: ON |
| frank26080115 | 0:bf7b9fba3924 | 68 | + ISP: ON |
| frank26080115 | 0:bf7b9fba3924 | 69 | - IAR LPC1768 KickStart vers.A: |
| frank26080115 | 0:bf7b9fba3924 | 70 | + RST_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 71 | + ISP_E: ON |
| frank26080115 | 0:bf7b9fba3924 | 72 | |
| frank26080115 | 0:bf7b9fba3924 | 73 | (Please reference "LPC1000 Software Development Toolchain" - chapter 4 "Creating and working with |
| frank26080115 | 0:bf7b9fba3924 | 74 | LPC1000CMSIS project" for more information) |
| frank26080115 | 0:bf7b9fba3924 | 75 | |
| frank26080115 | 0:bf7b9fba3924 | 76 | Step to run: |
| frank26080115 | 0:bf7b9fba3924 | 77 | - Step 1: Build example. |
| frank26080115 | 0:bf7b9fba3924 | 78 | - Step 2: Burn hex file into board (if run on ROM mode) |
| frank26080115 | 0:bf7b9fba3924 | 79 | - Step 3: Configure hardware as above instruction |
| frank26080115 | 0:bf7b9fba3924 | 80 | - Step 4: Run example and observe AOUT(P0.26) signal by oscilloscope |
| frank26080115 | 0:bf7b9fba3924 | 81 | |
| frank26080115 | 0:bf7b9fba3924 | 82 | (Pls see "LPC17xx Example Description" document - chapter "Examples > DAC > DMA" |
| frank26080115 | 0:bf7b9fba3924 | 83 | for more details) |
| frank26080115 | 0:bf7b9fba3924 | 84 | @Tip: |
| frank26080115 | 0:bf7b9fba3924 | 85 | - Open \EWARM\*.eww project file to run example on IAR |
| frank26080115 | 0:bf7b9fba3924 | 86 | - Open \RVMDK\*.uvproj project file to run example on Keil |