CUBEMX中STM32的DAC没有输出值，哪里出错了？（没有语法错误）

Question

while (1)
{
for(i=0;i<=20;i++)
{
Data=i*200;
HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, Data );
HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
HAL_DAC_SetValue(&hdac, DAC_CHANNEL_2, DAC_ALIGN_12B_R, Data );
HAL_DAC_Start(&hdac, DAC_CHANNEL_2);
printf ("a=%f v\r\n",3.3*(Data/4095));
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
HAL_Delay(1000);
}

Answer 1

GPIO_SetBits(GPIOA,GPIO_Pin_4);//这一句没用DAC_InitStruct.DAC_Trigger=DAC_Trigger_Software;//触发方式改为软件触发DAC_SetChannel1Data(DAC_Align_12b_R,temp);//这句后再跟一句DAC_SoftwareTriggerCmd(DAC_Channel_1,ENABLE);

追问

这是标准库，HAL库如何写