6-1 STM32F405--DAC输出（软件触发）

功能描述：配置STM32F405RGT6的DAC，在PA5引脚每隔2秒分别输出1V、2V、3V的电压。

• main.c文件内容如下

  #include "stm32f4xx.h"                  // Device header
  #include "Delay.h"
  #include "MyDAC.h"int main(void)
  {MyDAC_Init();	//初始化DACwhile(1){MyDAC_SetData(DAC_Channel_2, DAC_Align_12b_R, 1241);	//设置DAC通道2输出1V电压MyDAC_SoftwareTrigger(DAC_Channel_2);					//软件触发DAC通道2Delay_s(2);MyDAC_SetData(DAC_Channel_2, DAC_Align_12b_R, 2482);	//设置DAC通道2输出2V电压MyDAC_SoftwareTrigger(DAC_Channel_2);					//软件触发DAC通道2Delay_s(2);MyDAC_SetData(DAC_Channel_2, DAC_Align_12b_R, 3723);	//设置DAC通道2输出3V电压MyDAC_SoftwareTrigger(DAC_Channel_2);					//软件触发DAC通道2Delay_s(2);}
  }
  

• MyDAC.c文件内容如下

  #include "MyDAC.h"/*** @摘要  		初始化DAC* @参数  		无* @返回值  	无* @说明  		无*/
  void MyDAC_Init(void)
  {//开启GPIOA时钟RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//定义GPIO初始化结构体GPIO_InitTypeDef GPIO_InitStructure;//初始化上述结构体GPIO_StructInit(&GPIO_InitStructure);//配置GPIO模式为模拟模式GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//配置GPIO的速度为高速100MHZGPIO_InitStructure.GPIO_Speed = GPIO_High_Speed;//指定GPIO引脚为Pin5GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//初始化对应的GPIOGPIO_Init(GPIOA, &GPIO_InitStructure);//开启DAC时钟RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);//定义DAC初始化结构体DAC_InitTypeDef DAC_InitStruct;//初始化上述结构体DAC_StructInit(&DAC_InitStruct);//配置DAC的触发源为软件触发DAC_InitStruct.DAC_Trigger = DAC_Trigger_Software;//配置生成波形为不生成DAC_InitStruct.DAC_WaveGeneration = DAC_WaveGeneration_None;//波形生成幅度（此处无用）DAC_InitStruct.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;//开启输出缓冲器DAC_InitStruct.DAC_OutputBuffer = DAC_OutputBuffer_Enable;//初始化DACDAC_Init(DAC_Channel_2, &DAC_InitStruct);//使能DACDAC_Cmd(DAC_Channel_2, ENABLE);
  }/*** @摘要  		设置DAC的输出电压* @参数  		DAC_Channel：指定DAC通道* @参数  		DAC_Align：指定数据对齐方式*				可以为下列这些值*            	@arg DAC_Align_8b_R: 8bit right data alignment selected*            	@arg DAC_Align_12b_L: 12bit left data alignment selected*            	@arg DAC_Align_12b_R: 12bit right data alignment selected* @参数  		Data：写入保持寄存器的数据* @返回值  	无* @说明  		无*/
  void MyDAC_SetData(uint32_t DAC_Channel, uint32_t DAC_Align, uint16_t Data)
  {if(DAC_Channel == DAC_Channel_1)DAC_SetChannel1Data(DAC_Align, Data);else if(DAC_Channel == DAC_Channel_2)DAC_SetChannel2Data(DAC_Align, Data);
  }/*** @摘要  		软件触发DAC* @参数  		无* @返回值  	无* @说明  		无*/
  void MyDAC_SoftwareTrigger(uint32_t DAC_Channel)
  {DAC_SoftwareTriggerCmd(DAC_Channel, ENABLE);
  }
  

• MyDAC.h文件内容如下

  #ifndef __MYDAC_H
  #define __MYDAC_H#include "stm32f4xx.h"                  // Device headervoid MyDAC_Init(void);
  void MyDAC_SetData(uint32_t DAC_Channel, uint32_t DAC_Align, uint16_t Data);
  void MyDAC_SoftwareTrigger(uint32_t DAC_Channel);#endif