Question

STM32 DAC输出固定电压

下面的代码可以输出固定电压吗？我想在逻辑分析仪上看波形，但显示输出一直为0.

#include "stm32f10x_lib.h"

GPIO_InitTypeDef GPIO_InitStructure;
DAC_InitTypeDef DAC_InitStructure;

int main(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC,ENABLE);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

DAC_InitStructure.DAC_Trigger=DAC_Trigger_None;
DAC_InitStructure.DAC_WaveGeneration=DAC_WaveGeneration_None;
DAC_InitStructure.DAC_OutputBuffer=DAC_OutputBuffer_Disable;
DAC_Init(DAC_Channel_1,&DAC_InitStructure);

DAC_Cmd(DAC_Channel_1,ENABLE);

DAC_SoftwareTriggerCmd(DAC_Channel_1,ENABLE);
DAC_SetChannel1Data(DAC_Align_12b_R,2000);
DAC_SoftwareTriggerCmd(DAC_Channel_1,ENABLE);

while(1)
{

}
}

Answer 1

管脚就是GPIO_Mode_AIN状态，说什么设置成输出的都是扯淡。
DAC_InitStructure.DAC_OutputBuffer=DAC_OutputBuffer_Enable;

Answer 2

第四行改成GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出

Answer 3

管脚要配置成输出