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stm32f4xx_dac.c
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 r18 /**
******************************************************************************
* @file stm32f4xx_dac.c
* @author MCD Application Team
* @version V1.0.0RC1
* @date 25-August-2011
* @brief This file provides firmware functions to manage the following
* functionalities of the Digital-to-Analog Converter (DAC) peripheral:
* - DAC channels configuration: trigger, output buffer, data format
* - DMA management
* - Interrupts and flags management
*
* @verbatim
*
* ===================================================================
* DAC Peripheral features
* ===================================================================
*
* DAC Channels
* =============
* The device integrates two 12-bit Digital Analog Converters that can
* be used independently or simultaneously (dual mode):
* 1- DAC channel1 with DAC_OUT1 (PA4) as output
* 1- DAC channel2 with DAC_OUT2 (PA5) as output
*
* DAC Triggers
* =============
* Digital to Analog conversion can be non-triggered using DAC_Trigger_None
* and DAC_OUT1/DAC_OUT2 is available once writing to DHRx register
* using DAC_SetChannel1Data() / DAC_SetChannel2Data() functions.
*
* Digital to Analog conversion can be triggered by:
* 1- External event: EXTI Line 9 (any GPIOx_Pin9) using DAC_Trigger_Ext_IT9.
* The used pin (GPIOx_Pin9) must be configured in input mode.
*
* 2- Timers TRGO: TIM2, TIM4, TIM5, TIM6, TIM7 and TIM8
* (DAC_Trigger_T2_TRGO, DAC_Trigger_T4_TRGO...)
* The timer TRGO event should be selected using TIM_SelectOutputTrigger()
*
* 3- Software using DAC_Trigger_Software
*
* DAC Buffer mode feature
* ========================
* Each DAC channel integrates an output buffer that can be used to
* reduce the output impedance, and to drive external loads directly
* without having to add an external operational amplifier.
* To enable, the output buffer use
* DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
*
* Refer to the device datasheet for more details about output
* impedance value with and without output buffer.
*
* DAC wave generation feature
* =============================
* Both DAC channels can be used to generate
* 1- Noise wave using DAC_WaveGeneration_Noise
* 2- Triangle wave using DAC_WaveGeneration_Triangle
*
* Wave generation can be disabled using DAC_WaveGeneration_None
*
* DAC data format
* ================
* The DAC data format can be:
* 1- 8-bit right alignment using DAC_Align_8b_R
* 2- 12-bit left alignment using DAC_Align_12b_L
* 3- 12-bit right alignment using DAC_Align_12b_R
*
* DAC data value to voltage correspondence
* ========================================
* The analog output voltage on each DAC channel pin is determined
* by the following equation:
* DAC_OUTx = VREF+ * DOR / 4095
* with DOR is the Data Output Register
* VEF+ is the input voltage reference (refer to the device datasheet)
* e.g. To set DAC_OUT1 to 0.7V, use
* DAC_SetChannel1Data(DAC_Align_12b_R, 868);
* Assuming that VREF+ = 3.3V, DAC_OUT1 = (3.3 * 868) / 4095 = 0.7V
*
* DMA requests
* =============
* A DMA1 request can be generated when an external trigger (but not
* a software trigger) occurs if DMA1 requests are enabled using
* DAC_DMACmd()
* DMA1 requests are mapped as following:
* 1- DAC channel1 : mapped on DMA1 Stream5 channel7 which must be
* already configured
* 2- DAC channel2 : mapped on DMA1 Stream6 channel7 which must be
* already configured
*
* ===================================================================
* How to use this driver
* ===================================================================
* - DAC APB clock must be enabled to get write access to DAC
* registers using
* RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE)
* - Configure DAC_OUTx (DAC_OUT1: PA4, DAC_OUT2: PA5) in analog mode.
* - Configure the DAC channel using DAC_Init() function
* - Enable the DAC channel using DAC_Cmd() function
*
* @endverbatim
*
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
* <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_dac.h"
#include "stm32f4xx_rcc.h"
/** @addtogroup STM32F4xx_StdPeriph_Driver
* @{
*/
/** @defgroup DAC
* @brief DAC driver modules
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* CR register Mask */
#define CR_CLEAR_MASK ((uint32_t)0x00000FFE)
/* DAC Dual Channels SWTRIG masks */
#define DUAL_SWTRIG_SET ((uint32_t)0x00000003)
#define DUAL_SWTRIG_RESET ((uint32_t)0xFFFFFFFC)
/* DHR registers offsets */
#define DHR12R1_OFFSET ((uint32_t)0x00000008)
#define DHR12R2_OFFSET ((uint32_t)0x00000014)
#define DHR12RD_OFFSET ((uint32_t)0x00000020)
/* DOR register offset */
#define DOR_OFFSET ((uint32_t)0x0000002C)
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @defgroup DAC_Private_Functions
* @{
*/
/** @defgroup DAC_Group1 DAC channels configuration
* @brief DAC channels configuration: trigger, output buffer, data format
*
@verbatim
===============================================================================
DAC channels configuration: trigger, output buffer, data format
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Deinitializes the DAC peripheral registers to their default reset values.
* @param None
* @retval None
*/
void DAC_DeInit(void)
{
/* Enable DAC reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_DAC, ENABLE);
/* Release DAC from reset state */
RCC_APB1PeriphResetCmd(RCC_APB1Periph_DAC, DISABLE);
}
/**
* @brief Initializes the DAC peripheral according to the specified parameters
* in the DAC_InitStruct.
* @param DAC_Channel: the selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param DAC_InitStruct: pointer to a DAC_InitTypeDef structure that contains
* the configuration information for the specified DAC channel.
* @retval None
*/
void DAC_Init(uint32_t DAC_Channel, DAC_InitTypeDef* DAC_InitStruct)
{
uint32_t tmpreg1 = 0, tmpreg2 = 0;
/* Check the DAC parameters */
assert_param(IS_DAC_TRIGGER(DAC_InitStruct->DAC_Trigger));
assert_param(IS_DAC_GENERATE_WAVE(DAC_InitStruct->DAC_WaveGeneration));
assert_param(IS_DAC_LFSR_UNMASK_TRIANGLE_AMPLITUDE(DAC_InitStruct->DAC_LFSRUnmask_TriangleAmplitude));
assert_param(IS_DAC_OUTPUT_BUFFER_STATE(DAC_InitStruct->DAC_OutputBuffer));
/*---------------------------- DAC CR Configuration --------------------------*/
/* Get the DAC CR value */
tmpreg1 = DAC->CR;
/* Clear BOFFx, TENx, TSELx, WAVEx and MAMPx bits */
tmpreg1 &= ~(CR_CLEAR_MASK << DAC_Channel);
/* Configure for the selected DAC channel: buffer output, trigger,
wave generation, mask/amplitude for wave generation */
/* Set TSELx and TENx bits according to DAC_Trigger value */
/* Set WAVEx bits according to DAC_WaveGeneration value */
/* Set MAMPx bits according to DAC_LFSRUnmask_TriangleAmplitude value */
/* Set BOFFx bit according to DAC_OutputBuffer value */
tmpreg2 = (DAC_InitStruct->DAC_Trigger | DAC_InitStruct->DAC_WaveGeneration |
DAC_InitStruct->DAC_LFSRUnmask_TriangleAmplitude | \
DAC_InitStruct->DAC_OutputBuffer);
/* Calculate CR register value depending on DAC_Channel */
tmpreg1 |= tmpreg2 << DAC_Channel;
/* Write to DAC CR */
DAC->CR = tmpreg1;
}
/**
* @brief Fills each DAC_InitStruct member with its default value.
* @param DAC_InitStruct: pointer to a DAC_InitTypeDef structure which will
* be initialized.
* @retval None
*/
void DAC_StructInit(DAC_InitTypeDef* DAC_InitStruct)
{
/*--------------- Reset DAC init structure parameters values -----------------*/
/* Initialize the DAC_Trigger member */
DAC_InitStruct->DAC_Trigger = DAC_Trigger_None;
/* Initialize the DAC_WaveGeneration member */
DAC_InitStruct->DAC_WaveGeneration = DAC_WaveGeneration_None;
/* Initialize the DAC_LFSRUnmask_TriangleAmplitude member */
DAC_InitStruct->DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;
/* Initialize the DAC_OutputBuffer member */
DAC_InitStruct->DAC_OutputBuffer = DAC_OutputBuffer_Enable;
}
/**
* @brief Enables or disables the specified DAC channel.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param NewState: new state of the DAC channel.
* This parameter can be: ENABLE or DISABLE.
* @note When the DAC channel is enabled the trigger source can no more be modified.
* @retval None
*/
void DAC_Cmd(uint32_t DAC_Channel, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected DAC channel */
DAC->CR |= (DAC_CR_EN1 << DAC_Channel);
}
else
{
/* Disable the selected DAC channel */
DAC->CR &= (~(DAC_CR_EN1 << DAC_Channel));
}
}
/**
* @brief Enables or disables the selected DAC channel software trigger.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param NewState: new state of the selected DAC channel software trigger.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void DAC_SoftwareTriggerCmd(uint32_t DAC_Channel, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable software trigger for the selected DAC channel */
DAC->SWTRIGR |= (uint32_t)DAC_SWTRIGR_SWTRIG1 << (DAC_Channel >> 4);
}
else
{
/* Disable software trigger for the selected DAC channel */
DAC->SWTRIGR &= ~((uint32_t)DAC_SWTRIGR_SWTRIG1 << (DAC_Channel >> 4));
}
}
/**
* @brief Enables or disables simultaneously the two DAC channels software triggers.
* @param NewState: new state of the DAC channels software triggers.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void DAC_DualSoftwareTriggerCmd(FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable software trigger for both DAC channels */
DAC->SWTRIGR |= DUAL_SWTRIG_SET;
}
else
{
/* Disable software trigger for both DAC channels */
DAC->SWTRIGR &= DUAL_SWTRIG_RESET;
}
}
/**
* @brief Enables or disables the selected DAC channel wave generation.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param DAC_Wave: specifies the wave type to enable or disable.
* This parameter can be one of the following values:
* @arg DAC_Wave_Noise: noise wave generation
* @arg DAC_Wave_Triangle: triangle wave generation
* @param NewState: new state of the selected DAC channel wave generation.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void DAC_WaveGenerationCmd(uint32_t DAC_Channel, uint32_t DAC_Wave, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_DAC_WAVE(DAC_Wave));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected wave generation for the selected DAC channel */
DAC->CR |= DAC_Wave << DAC_Channel;
}
else
{
/* Disable the selected wave generation for the selected DAC channel */
DAC->CR &= ~(DAC_Wave << DAC_Channel);
}
}
/**
* @brief Set the specified data holding register value for DAC channel1.
* @param DAC_Align: Specifies the data alignment for DAC channel1.
* This parameter can be one of the following values:
* @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
* @param Data: Data to be loaded in the selected data holding register.
* @retval None
*/
void DAC_SetChannel1Data(uint32_t DAC_Align, uint16_t Data)
{
__IO uint32_t tmp = 0;
/* Check the parameters */
assert_param(IS_DAC_ALIGN(DAC_Align));
assert_param(IS_DAC_DATA(Data));
tmp = (uint32_t)DAC_BASE;
tmp += DHR12R1_OFFSET + DAC_Align;
/* Set the DAC channel1 selected data holding register */
*(__IO uint32_t *) tmp = Data;
}
/**
* @brief Set the specified data holding register value for DAC channel2.
* @param DAC_Align: Specifies the data alignment for DAC channel2.
* This parameter can be one of the following values:
* @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
* @param Data: Data to be loaded in the selected data holding register.
* @retval None
*/
void DAC_SetChannel2Data(uint32_t DAC_Align, uint16_t Data)
{
__IO uint32_t tmp = 0;
/* Check the parameters */
assert_param(IS_DAC_ALIGN(DAC_Align));
assert_param(IS_DAC_DATA(Data));
tmp = (uint32_t)DAC_BASE;
tmp += DHR12R2_OFFSET + DAC_Align;
/* Set the DAC channel2 selected data holding register */
*(__IO uint32_t *)tmp = Data;
}
/**
* @brief Set the specified data holding register value for dual channel DAC.
* @param DAC_Align: Specifies the data alignment for dual channel DAC.
* This parameter can be one of the following values:
* @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
* @param Data2: Data for DAC Channel2 to be loaded in the selected data holding register.
* @param Data1: Data for DAC Channel1 to be loaded in the selected data holding register.
* @note In dual mode, a unique register access is required to write in both
* DAC channels at the same time.
* @retval None
*/
void DAC_SetDualChannelData(uint32_t DAC_Align, uint16_t Data2, uint16_t Data1)
{
uint32_t data = 0, tmp = 0;
/* Check the parameters */
assert_param(IS_DAC_ALIGN(DAC_Align));
assert_param(IS_DAC_DATA(Data1));
assert_param(IS_DAC_DATA(Data2));
/* Calculate and set dual DAC data holding register value */
if (DAC_Align == DAC_Align_8b_R)
{
data = ((uint32_t)Data2 << 8) | Data1;
}
else
{
data = ((uint32_t)Data2 << 16) | Data1;
}
tmp = (uint32_t)DAC_BASE;
tmp += DHR12RD_OFFSET + DAC_Align;
/* Set the dual DAC selected data holding register */
*(__IO uint32_t *)tmp = data;
}
/**
* @brief Returns the last data output value of the selected DAC channel.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @retval The selected DAC channel data output value.
*/
uint16_t DAC_GetDataOutputValue(uint32_t DAC_Channel)
{
__IO uint32_t tmp = 0;
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
tmp = (uint32_t) DAC_BASE ;
tmp += DOR_OFFSET + ((uint32_t)DAC_Channel >> 2);
/* Returns the DAC channel data output register value */
return (uint16_t) (*(__IO uint32_t*) tmp);
}
/**
* @}
*/
/** @defgroup DAC_Group2 DMA management functions
* @brief DMA management functions
*
@verbatim
===============================================================================
DMA management functions
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Enables or disables the specified DAC channel DMA request.
* @note When enabled DMA1 is generated when an external trigger (EXTI Line9,
* TIM2, TIM4, TIM5, TIM6, TIM7 or TIM8 but not a software trigger) occurs.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param NewState: new state of the selected DAC channel DMA request.
* This parameter can be: ENABLE or DISABLE.
* @note The DAC channel1 is mapped on DMA1 Stream 5 channel7 which must be
* already configured.
* @note The DAC channel2 is mapped on DMA1 Stream 6 channel7 which must be
* already configured.
* @retval None
*/
void DAC_DMACmd(uint32_t DAC_Channel, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the selected DAC channel DMA request */
DAC->CR |= (DAC_CR_DMAEN1 << DAC_Channel);
}
else
{
/* Disable the selected DAC channel DMA request */
DAC->CR &= (~(DAC_CR_DMAEN1 << DAC_Channel));
}
}
/**
* @}
*/
/** @defgroup DAC_Group3 Interrupts and flags management functions
* @brief Interrupts and flags management functions
*
@verbatim
===============================================================================
Interrupts and flags management functions
===============================================================================
@endverbatim
* @{
*/
/**
* @brief Enables or disables the specified DAC interrupts.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param DAC_IT: specifies the DAC interrupt sources to be enabled or disabled.
* This parameter can be the following values:
* @arg DAC_IT_DMAUDR: DMA underrun interrupt mask
* @note The DMA underrun occurs when a second external trigger arrives before the
* acknowledgement for the first external trigger is received (first request).
* @param NewState: new state of the specified DAC interrupts.
* This parameter can be: ENABLE or DISABLE.
* @retval None
*/
void DAC_ITConfig(uint32_t DAC_Channel, uint32_t DAC_IT, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_FUNCTIONAL_STATE(NewState));
assert_param(IS_DAC_IT(DAC_IT));
if (NewState != DISABLE)
{
/* Enable the selected DAC interrupts */
DAC->CR |= (DAC_IT << DAC_Channel);
}
else
{
/* Disable the selected DAC interrupts */
DAC->CR &= (~(uint32_t)(DAC_IT << DAC_Channel));
}
}
/**
* @brief Checks whether the specified DAC flag is set or not.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param DAC_FLAG: specifies the flag to check.
* This parameter can be only of the following value:
* @arg DAC_FLAG_DMAUDR: DMA underrun flag
* @note The DMA underrun occurs when a second external trigger arrives before the
* acknowledgement for the first external trigger is received (first request).
* @retval The new state of DAC_FLAG (SET or RESET).
*/
FlagStatus DAC_GetFlagStatus(uint32_t DAC_Channel, uint32_t DAC_FLAG)
{
FlagStatus bitstatus = RESET;
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_DAC_FLAG(DAC_FLAG));
/* Check the status of the specified DAC flag */
if ((DAC->SR & (DAC_FLAG << DAC_Channel)) != (uint8_t)RESET)
{
/* DAC_FLAG is set */
bitstatus = SET;
}
else
{
/* DAC_FLAG is reset */
bitstatus = RESET;
}
/* Return the DAC_FLAG status */
return bitstatus;
}
/**
* @brief Clears the DAC channel's pending flags.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param DAC_FLAG: specifies the flag to clear.
* This parameter can be of the following value:
* @arg DAC_FLAG_DMAUDR: DMA underrun flag
* @note The DMA underrun occurs when a second external trigger arrives before the
* acknowledgement for the first external trigger is received (first request).
* @retval None
*/
void DAC_ClearFlag(uint32_t DAC_Channel, uint32_t DAC_FLAG)
{
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_DAC_FLAG(DAC_FLAG));
/* Clear the selected DAC flags */
DAC->SR = (DAC_FLAG << DAC_Channel);
}
/**
* @brief Checks whether the specified DAC interrupt has occurred or not.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param DAC_IT: specifies the DAC interrupt source to check.
* This parameter can be the following values:
* @arg DAC_IT_DMAUDR: DMA underrun interrupt mask
* @note The DMA underrun occurs when a second external trigger arrives before the
* acknowledgement for the first external trigger is received (first request).
* @retval The new state of DAC_IT (SET or RESET).
*/
ITStatus DAC_GetITStatus(uint32_t DAC_Channel, uint32_t DAC_IT)
{
ITStatus bitstatus = RESET;
uint32_t enablestatus = 0;
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_DAC_IT(DAC_IT));
/* Get the DAC_IT enable bit status */
enablestatus = (DAC->CR & (DAC_IT << DAC_Channel)) ;
/* Check the status of the specified DAC interrupt */
if (((DAC->SR & (DAC_IT << DAC_Channel)) != (uint32_t)RESET) && enablestatus)
{
/* DAC_IT is set */
bitstatus = SET;
}
else
{
/* DAC_IT is reset */
bitstatus = RESET;
}
/* Return the DAC_IT status */
return bitstatus;
}
/**
* @brief Clears the DAC channel's interrupt pending bits.
* @param DAC_Channel: The selected DAC channel.
* This parameter can be one of the following values:
* @arg DAC_Channel_1: DAC Channel1 selected
* @arg DAC_Channel_2: DAC Channel2 selected
* @param DAC_IT: specifies the DAC interrupt pending bit to clear.
* This parameter can be the following values:
* @arg DAC_IT_DMAUDR: DMA underrun interrupt mask
* @note The DMA underrun occurs when a second external trigger arrives before the
* acknowledgement for the first external trigger is received (first request).
* @retval None
*/
void DAC_ClearITPendingBit(uint32_t DAC_Channel, uint32_t DAC_IT)
{
/* Check the parameters */
assert_param(IS_DAC_CHANNEL(DAC_Channel));
assert_param(IS_DAC_IT(DAC_IT));
/* Clear the selected DAC interrupt pending bits */
DAC->SR = (DAC_IT << DAC_Channel);
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/