abstract.h

00001  ******************** (C) COPYRIGHT 2010 NXPSemiconductors *******************
00002  * @file    DAC\DMA\abstract.txt 
00003  * @author  NXP MCU SW Application Team
00004  * @version 2.0
00005  * @date    
00006  * @brief   Description of the DAC DMA example.
00007  ******************************************************************************
00008  * Software that is described herein is for illustrative purposes only
00009  * which provides customers with programming information regarding the
00010  * products. This software is supplied "AS IS" without any warranties.
00011  * NXP Semiconductors assumes no responsibility or liability for the
00012  * use of the software, conveys no license or title under any patent,
00013  * copyright, or mask work right to the product. NXP Semiconductors
00014  * reserves the right to make changes in the software without
00015  * notification. NXP Semiconductors also make no representation or
00016  * warranty that such application will be suitable for the specified
00017  * use without further testing or modification.
00018  ******************************************************************************
00019   
00020 @Example description:
00021     Purpose:
00022         This example describes how to use DMA to transfer data to DAC peripheral
00023     Process:
00024         DAC will be initialized with maximum current is 700uA. This allows a maximum update rate of 1Mhz
00025         Formula for ouput voltage on AOUT is: 
00026             AOUT = VALUE x ((Vrefp - Vrefn)/1024)+Vrefn
00027         in which:
00028         - Vrefp: tied to VDD(3.3V)
00029         - Vrefn: tied to Vss
00030         
00031         GPDMA channel 0 is configured in this example.
00032         GPDMA channel 0 will tranfer "dac_value" to DAC peripheral. DAC updated values have range 
00033         from 0 to 0x3FF. So AOUT ouput voltage will change from: Vss to VDD.
00034         
00035         Observe AOUT(P0.26) signal by oscilloscope.
00036                     
00037 @Directory contents:
00038     \EWARM: includes EWARM (IAR) project and configuration files
00039     \Keil:  includes RVMDK (Keil)project and configuration files 
00040      
00041     lpc17xx_libcfg.h: Library configuration file - include needed driver library for this example 
00042     makefile: Example's makefile (to build with GNU toolchain)
00043     dac_dma.c: Main program
00044 
00045 @How to run:
00046     Hardware configuration:     
00047         This example was tested on:
00048             Keil MCB1700 with LPC1768 vers.1
00049                 These jumpers must be configured as following:
00050                 - VDDIO: ON
00051                 - VDDREGS: ON 
00052                 - VBUS: ON
00053                 - Remain jumpers: OFF
00054             IAR LPC1768 KickStart vers.A
00055                 These jumpers must be configured as following:
00056                 - PWR_SEL: depend on power source
00057                 - DBG_EN : ON
00058                 - Remain jumpers: OFF
00059                 
00060     
00061     Running mode:
00062         This example can run on RAM/ROM mode.
00063                     
00064         Note: If want to burn hex file to board by using Flash Magic, these jumpers need
00065         to be connected:
00066             - MCB1700 with LPC1768 ver.1:
00067                 + RST: ON
00068                 + ISP: ON
00069             - IAR LPC1768 KickStart vers.A:
00070                 + RST_E: ON
00071                 + ISP_E: ON
00072         
00073         (Please reference "LPC1000 Software Development Toolchain" - chapter 4 "Creating and working with
00074         LPC1000CMSIS project" for more information)
00075     
00076     Step to run:
00077         - Step 1: Build example.
00078         - Step 2: Burn hex file into board (if run on ROM mode)
00079         - Step 3: Configure hardware as above instruction 
00080         - Step 4: Run example and observe AOUT(P0.26) signal by oscilloscope
00081         
00082         (Pls see "LPC17xx Example Description" document - chapter "Examples > DAC > DMA"
00083         for more details)
00084 @Tip:
00085     - Open \EWARM\*.eww project file to run example on IAR
00086     - Open \RVMDK\*.uvproj project file to run example on Keil