stm32 DMA触发DAC 正弦波

在dma下触发dac 产生正弦波，可以节省时间 并且精度高 程序更加简洁明了

#include “dac.h“
#include “time.h“
 
//u8 Idx=0;

void GPIO_Configuration（）
{
	GPIO_InitTypeDef GPIO_InitStructure;
		
	RCC_APB2PeriphClockCmd（RCC_APB2Periph_GPIOA  ENABLE）;

	GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

	GPIO_Init（GPIOA &GPIO_InitStructure）;

}

void DAC_Configuration（）
{
  	DAC_InitTypeDef        DAC_InitStructure;

	RCC_APB1PeriphClockCmd（RCC_APB1Periph_DAC ENABLE）;
	

	DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;
	DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
	DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude=DAC_TriangleAmplitude_4095;
	DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;

	DAC_Init（DAC_Channel_1  &DAC_InitStructure）;
	DAC_DMACmd（DAC_Channel_1 ENABLE）; 
	DAC_Cmd（DAC_Channel_1 ENABLE）;
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2013-01-25 14:40  正弦波_按键\
     文件         916  2013-01-23 08:58  正弦波_按键\DAC.c
     文件        1957  2013-01-23 08:59  正弦波_按键\DMA.c
     文件         105  2013-01-21 11:07  正弦波_按键\DMA.h
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\
     目录           0  2013-01-25 14:57  正弦波_按键\Libraries\CMSIS\
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\CoreSupport\
     文件       17273  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\CoreSupport\core_cm3.c
     文件       85714  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\CoreSupport\core_cm3.h
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\
     文件       25107  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\Release_Notes_for_STM32F10x_CMSIS.html
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\
     文件       12486  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_cl.s
     文件       12474  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_hd.s
     文件       12192  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_hd_vl.s
     文件        9710  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_ld.s
     文件       10159  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_ld_vl.s
     文件       10159  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_md.s
     文件       10624  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_md_vl.s
     文件       13134  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\TrueSTUDIO\startup_stm32f10x_xl.s
     目录           0  2013-01-13 19:42  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\
     文件       15763  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_cl.s
     文件       15500  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_hd.s
     文件       15767  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_hd_vl.s
     文件       12373  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_ld.s
     文件       13653  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_ld_vl.s
     文件       12762  2010-10-18 20:09  正弦波_按键\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_md.s
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