STM32DAC

#include "stm32f10x.h"
void Dac1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
DAC_InitTypeDef DAC_InitType;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //开启IO时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); //开启DA时钟

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //配置端口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //输入模式
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//IO速度
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_SetBits(GPIOA,GPIO_Pin_4) ;//IO口置高


DAC_InitType.DAC_Trigger=DAC_Trigger_None; //不使用触发功能
DAC_InitType.DAC_WaveGeneration=DAC_WaveGeneration_None;//不是用波形发生器
DAC_InitType.DAC_LFSRUnmask_TriangleAmplitude=DAC_LFSRUnmask_Bit0;//屏蔽幅值设置
DAC_InitType.DAC_OutputBuffer=DAC_OutputBuffer_Disable ; //关闭DAC1缓存

DAC_Init(DAC_Channel_1,&DAC_InitType); //初始化DAC1
DAC_Cmd(DAC_Channel_1, ENABLE); //使能DCA1
DAC_SetChannel1Data(DAC_Align_12b_R, 0); //12位右对齐
}
//vol:0~3300,对应0~3.3V
void Dac1_Set_Vol(u16 vol)
{
float temp=vol;
temp/=1000;
temp=temp*4096/3.3;
DAC_SetChannel1Data(DAC_Align_12b_R,temp);//输出
}
int main()
{
int i;
Dac1_Init();
while(1)
{
for(i=0;i<3000;i++)
{
Dac1_Set_Vol(i);
}
}

}