/********************************************************************** * $Id$ abstract.txt *//** * @file abstract.txt * @brief Example description file * @version 2.0 * @date * @author NXP MCU SW Application Team * * Copyright(C) 2010, NXP Semiconductor * All rights reserved. * *********************************************************************** * 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 DMA to transfer data to DAC peripheral Process: DAC will be initialized with maximum current is 700uA. This allows a maximum update rate of 1Mhz Formula for ouput voltage on AOUT is: AOUT = VALUE x ((Vrefp - Vrefn)/1024)+Vrefn in which: - Vrefp: tied to VDD(3.3V) - Vrefn: tied to Vss GPDMA channel 0 is configured in this example. GPDMA channel 0 will tranfer "dac_value" to DAC peripheral. DAC updated values have range from 0 to 0x3FF. So AOUT ouput voltage will change from: Vss to VDD. Observe AOUT(P0.26) pin 7 of J7 on the Lincoln signal by oscilloscope. @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) dac_dma.c: Main program @How to run: Running mode: This example can run on RAM/ROM mode. Step to run: - Step 1: Build example. - Step 2: Burn hex file into board (if run on ROM mode) - Step 3: Configure hardware as above instruction - Step 4: Run example and observe AOUT(P0.26) on pin 7 of J7 signal by oscilloscope @Tip: - Open \EWARM\*.eww project file to run example on IAR - Open \RVMDK\*.uvproj project file to run example on Keil