自学教程：C++ DAC_Cmd函数代码示例

void DAC_ConfigurationInit(){	DAC_InitTypeDef DAC_InitStruct;	GPIO_InitTypeDef GPIO_InitStruct;	RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE );	RCC_APB1PeriphClockCmd( RCC_APB1Periph_DAC, ENABLE );        	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;	GPIO_Init( GPIOA, &GPIO_InitStruct );	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;	GPIO_Init( GPIOA, &GPIO_InitStruct );	DAC_InitStruct.DAC_Trigger = DAC_Trigger_Software;	DAC_InitStruct.DAC_WaveGeneration = DAC_WaveGeneration_None;	DAC_InitStruct.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;	DAC_InitStruct.DAC_OutputBuffer = DAC_OutputBuffer_Disable;	DAC_Init( DAC_Channel_1, &DAC_InitStruct );	DAC_Init( DAC_Channel_2, &DAC_InitStruct );	DAC_Cmd( DAC_Channel_1, ENABLE );	DAC_Cmd( DAC_Channel_2, ENABLE );	DAC_SetChannel1Data( DAC_Align_12b_R, 0X0fFF);	DAC_SoftwareTriggerCmd( DAC_Channel_1, ENABLE );	DAC_SetChannel1Data( DAC_Align_12b_R, 0X03FF);	DAC_SoftwareTriggerCmd( DAC_Channel_2, ENABLE );}

/**  * @brief  DAC Channel2 Triangle and Channel1 Noise Configuration  * @param  None  * @retval None  */static void DAC_Noise_TriangleConfig(void){  /* DAC channel2 Configuration */  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Triangle;  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_1023;  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;  DAC_Init(DAC_Channel_2, &DAC_InitStructure);    /* Enable DAC Channel2 */  DAC_Cmd(DAC_Channel_2, ENABLE);    /* Set DAC channel2 DHR12RD register */  DAC_SetChannel2Data(DAC_Align_12b_R, 0x100);     /* DAC channel1 Configuration */  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Noise;  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits10_0;  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;  DAC_Init(DAC_Channel_1, &DAC_InitStructure);    /* Enable DAC Channel1 */  DAC_Cmd(DAC_Channel_1, ENABLE);    /* Set DAC Channel1 DHR12L register */  DAC_SetChannel1Data(DAC_Align_12b_L, 0x7FF0);}

void init_DACs(void){    // Now to output to some pin ofcourse, PA4 for example (routed to audio PA)    //  Enable clock to GPIOA    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);    // Init the pins    GPIO_InitTypeDef GPIOInit = {0, };    GPIOInit.GPIO_Pin	= GPIO_Pin_4 | GPIO_Pin_5; // PA4    GPIOInit.GPIO_Mode	= GPIO_Mode_AN; // Analog function    GPIOInit.GPIO_PuPd	= GPIO_PuPd_NOPULL;        GPIO_Init(GPIOA, &GPIOInit);    // Enable the clock to the DAC    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);    DAC_InitTypeDef dacInit;    memset( (void *)&dacInit, 0, sizeof(DAC_InitTypeDef) );    dacInit.DAC_Trigger = DAC_Trigger_None;    dacInit.DAC_OutputBuffer = DAC_OutputBuffer_Disable;        DAC_Init(DAC_Channel_1, &dacInit);    DAC_Cmd(DAC_Channel_1, ENABLE);    DAC_Init(DAC_Channel_2, &dacInit);    DAC_Cmd(DAC_Channel_2, ENABLE);}

/**  * @brief  Configures DAC channel 1 and channel 2  * @param  None  * @retval None  */void DAC_Config(void){  /* Enable GPIOA Periph clock --------------------------------------*/  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);  /* Configure PA.04 (DAC_OUT1), PA.05 (DAC_OUT2) as analog */  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4 | GPIO_Pin_5;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;  GPIO_Init(GPIOA, &GPIO_InitStructure);  /* DAC Periph clock enable */  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);  /* DAC init struct configuration */  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;  /* DAC channel1 Configuration */  DAC_Init(DAC_Channel_1, &DAC_InitStructure);  /* DAC channel2 Configuration */  DAC_Init(DAC_Channel_2, &DAC_InitStructure);  /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is      automatically connected to the DAC converter. */  DAC_Cmd(DAC_Channel_1, ENABLE);    /* Enable DAC Channel2: Once the DAC channel2 is enabled, PA.05 is      automatically connected to the DAC converter. */  DAC_Cmd(DAC_Channel_2, ENABLE);  /* Enable DMA for DAC Channel2 */  DAC_DMACmd(DAC_Channel_2, ENABLE);}

void setup_dac(){#if isUsingDevBoard	//Setup GPIO	RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);	DAC_InitTypeDef DAC_InitStructure;	/* DAC channel1 Configuration */	DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;	DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;	DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits10_0;	DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;	DAC_Init(DAC_Channel_1, &DAC_InitStructure);	DAC_Init(DAC_Channel_2, &DAC_InitStructure);	/* Enable DAC Channel1 */	DAC_Cmd(DAC_Channel_1, ENABLE);	DAC_Cmd(DAC_Channel_2, ENABLE);	/* Set DAC Channel1 DHR12L register */	DAC_SetChannel1Data(DAC_Align_8b_R, 0x0000);	DAC_SetChannel2Data(DAC_Align_8b_R, 0x0000);#else#endif}

/**  * @brief   Main program.  * @param  None  * @retval None  */int main(void){  /*!< At this stage the microcontroller clock setting is already configured,       this is done through SystemInit() function which is called from startup       file (startup_stm32f10x_xx.s) before to branch to application main.       To reconfigure the default setting of SystemInit() function, refer to       system_stm32f10x.c file     */  /* System Clocks Configuration */  RCC_Configuration();  /* Once the DAC channel is enabled, the corresponding GPIO pin is automatically     connected to the DAC converter. In order to avoid parasitic consumption,     the GPIO pin should be configured in analog */  GPIO_Configuration();  /* TIM2 Configuration */  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);  TIM_TimeBaseStructure.TIM_Period = 0xF;  TIM_TimeBaseStructure.TIM_Prescaler = 0xF;  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);  /* TIM2 TRGO selection */  TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);  /* DAC channel1 Configuration */  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_Triangle;  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_2047;  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;  DAC_Init(DAC_Channel_1, &DAC_InitStructure);  /* DAC channel2 Configuration */  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_1023;  DAC_Init(DAC_Channel_2, &DAC_InitStructure);  /* Enable DAC Channel1: Once the DAC channel1 is enabled, PA.04 is     automatically connected to the DAC converter. */  DAC_Cmd(DAC_Channel_1, ENABLE);  /* Enable DAC Channel2: Once the DAC channel2 is enabled, PA.05 is     automatically connected to the DAC converter. */  DAC_Cmd(DAC_Channel_2, ENABLE);  /* Set DAC dual channel DHR12RD register */  DAC_SetDualChannelData(DAC_Align_12b_R, 0x100, 0x100);  /* TIM2 enable counter */  TIM_Cmd(TIM2, ENABLE);  while (1)  {  }}

void SOUNDInitDAC(uint32_t sampleRate){	GPIO_InitTypeDef GPIO_InitStructure;	DAC_InitTypeDef DAC_InitStructure;//	CS43L22Init();	RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC | RCC_APB1Periph_TIM6, ENABLE);	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1 | RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOC, ENABLE);	// PC5 MAX4410 Audio Amp Shutdown	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;	GPIO_Init(GPIOC, &GPIO_InitStructure);	// 初期化
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