关于DAC双通道的问题

jizhendong1994 · 发表于 2017-1-20 14:20:06

按照原子哥的单通道程序改写的程序如下所示，可是为什么通道2没有波形输出呀  求解答
#include "dac.h"
void DAC1_Init(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;
DAC_InitTypeDef DAC_InitType;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能GPIOA时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);    //使能DAC时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5;             //PA4  PA5
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;          //模拟功能
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;          //下拉
GPIO_Init(GPIOA, &GPIO_InitStructure);                //初始化

DAC_InitType.DAC_Trigger=DAC_Trigger_None;                         //不使用触发功能 TEN1=0
DAC_InitType.DAC_WaveGeneration=DAC_WaveGeneration_None;       //不使用波形发生
DAC_InitType.DAC_LFSRUnmask_TriangleAmplitude=DAC_LFSRUnmask_Bit0;//屏蔽、幅值设置
DAC_InitType.DAC_OutputBuffer=DAC_OutputBuffer_Disable ;       //DAC1输出缓存关闭 BOFF1=1
DAC_Init(DAC_Channel_1,&DAC_InitType);                            //初始化DAC通道1
DAC_Init(DAC_Channel_2,&DAC_InitType); //初始化DAC通道2

DAC_Cmd(DAC_Channel_1, ENABLE); //使能DAC通道1
DAC_Cmd(DAC_Channel_2,ENABLE);    //使能DAC通道2
DAC_SetDualChannelData(DAC_Align_12b_R,0,0);
//DAC_SetChannel1Data(DAC_Align_12b_R, 0);  //12位右对齐数据格式设置DAC值
}
/*-------------------------------------------------*/
/*函数名：设置DAC的输出电压                      */
/*参  数：vol：0-3300 对应0-3.3v                */
/*返回值：无                                     */
/*-------------------------------------------------*/
void DAC1_SetVol(double vol2,double vol1)
{
vol1/=1000;
vol1=vol1*4096/3.3;

vol2/=1000;
vol2=vol2*4096/3.3;

DAC_SetDualChannelData(DAC_Align_12b_R,vol2,vol1); //设置DAC值
}