This file provides firmware functions to manage the following functionalities of the Digital-to-Analog Converter (DAC) peripheral: More...

#include "stm32f37x_dac.h"
#include "stm32f37x_rcc.h"

Macros
#define	CR_CLEAR_MASK ((uint32_t)0x00000FFE)

#define	DUAL_SWTRIG_SET ((uint32_t)0x00000003)

#define	DUAL_SWTRIG_RESET ((uint32_t)0xFFFFFFFC)

#define	DHR12R1_OFFSET ((uint32_t)0x00000008)

#define	DHR12R2_OFFSET ((uint32_t)0x00000014)

#define	DHR12RD_OFFSET ((uint32_t)0x00000020)

#define	DOR_OFFSET ((uint32_t)0x0000002C)

Functions
void	DAC_DeInit (DAC_TypeDef *DACx)
	Deinitializes the DAC peripheral registers to their default reset values. More...

void	DAC_Init (DAC_TypeDef DACx, uint32_t DAC_Channel, DAC_InitTypeDef DAC_InitStruct)
	Initializes the DAC peripheral according to the specified parameters in the DAC_InitStruct. More...

void	DAC_StructInit (DAC_InitTypeDef *DAC_InitStruct)
	Fills each DAC_InitStruct member with its default value. More...

void	DAC_Cmd (DAC_TypeDef *DACx, uint32_t DAC_Channel, FunctionalState NewState)
	Enables or disables the specified DAC channel. More...

void	DAC_SoftwareTriggerCmd (DAC_TypeDef *DACx, uint32_t DAC_Channel, FunctionalState NewState)
	Enables or disables the selected DAC channel software trigger. More...

void	DAC_DualSoftwareTriggerCmd (DAC_TypeDef *DACx, FunctionalState NewState)
	Enables or disables simultaneously the two DAC channels software triggers. More...

void	DAC_WaveGenerationCmd (DAC_TypeDef *DACx, uint32_t DAC_Channel, uint32_t DAC_Wave, FunctionalState NewState)
	Enables or disables the selected DAC channel wave generation. More...

void	DAC_SetChannel1Data (DAC_TypeDef *DACx, uint32_t DAC_Align, uint16_t Data)
	Set the specified data holding register value for DAC channel1. More...

void	DAC_SetChannel2Data (DAC_TypeDef *DACx, uint32_t DAC_Align, uint16_t Data)
	Set the specified data holding register value for DAC channel2. More...

void	DAC_SetDualChannelData (DAC_TypeDef *DACx, uint32_t DAC_Align, uint16_t Data2, uint16_t Data1)
	Set the specified data holding register value for dual channel DAC. More...

uint16_t	DAC_GetDataOutputValue (DAC_TypeDef *DACx, uint32_t DAC_Channel)
	Returns the last data output value of the selected DAC channel. More...

void	DAC_DMACmd (DAC_TypeDef *DACx, uint32_t DAC_Channel, FunctionalState NewState)
	Enables or disables the specified DAC channel DMA request. When enabled DMA1 is generated when an external trigger (EXTI Line9, TIM2, TIM4, TIM6, TIM7 or TIM9 but not a software trigger) occurs. More...

void	DAC_ITConfig (DAC_TypeDef *DACx, uint32_t DAC_Channel, uint32_t DAC_IT, FunctionalState NewState)
	Enables or disables the specified DAC interrupts. More...

FlagStatus	DAC_GetFlagStatus (DAC_TypeDef *DACx, uint32_t DAC_Channel, uint32_t DAC_FLAG)
	Checks whether the specified DAC flag is set or not. More...

void	DAC_ClearFlag (DAC_TypeDef *DACx, uint32_t DAC_Channel, uint32_t DAC_FLAG)
	Clears the DAC channel's pending flags. More...

ITStatus	DAC_GetITStatus (DAC_TypeDef *DACx, uint32_t DAC_Channel, uint32_t DAC_IT)
	Checks whether the specified DAC interrupt has occurred or not. More...

void	DAC_ClearITPendingBit (DAC_TypeDef *DACx, uint32_t DAC_Channel, uint32_t DAC_IT)
	Clears the DAC channel's interrupt pending bits. More...

Detailed Description

This file provides firmware functions to manage the following functionalities of the Digital-to-Analog Converter (DAC) peripheral:

Author: MCD Application Team

Version: V1.0.0

Date

20-September-2012

DAC channels configuration: trigger, output buffer, data format
DMA management
Interrupts and flags management

 *
===============================================================================
                       ##### DAC Peripheral features #####
===============================================================================
   [..] The device integrates three 12-bit Digital Analog Converters:
        (#) DAC1 integrates two DAC channels:
            (++) DAC1 channel 1 with DAC1_OUT1 as output
            (++) DAC1 channel 2 with DAC1_OUT2 as output
            (++) The two channels can be used independently or simultaneously (dual mode)
  
        (#) DAC2 integrates only one channel DAC2 channel 1 with DAC2_OUT1 as output 
  
   [..] The Digital to Analog conversion can be non-triggered using DAC_Trigger_None
        and DACx_OUTy is available once writing to DHRx register using 
        DAC_SetChannel1Data()/DAC_SetChannel2Data.
     
   [..] Digital to Analog conversion can be triggered by:
        (#) External event: EXTI Line 9 (any GPIOx_Pin9) using DAC_Trigger_Ext_IT9.
            The used pin (GPIOx_Pin9) must be configured in input mode.
 
        (#) Timers TRGO: TIM2, TIM3, TIM4, TIM5, TIM6, TIM7 and TIM18
            (DAC_Trigger_T2_TRGO, DAC_Trigger_T4_TRGO...)
            The timer TRGO event should be selected using TIM_SelectOutputTrigger()
            (++) TIM5 is applicable only for DAC1
            (++) TIM18 is applicable only for DAC2
     
        (#) Software using DAC_Trigger_Software
 
   [..] 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;
        before caliing DAC_Init() function
   
   [..] Refer to the device datasheet for more details about output impedance
        value with and without output buffer.
 
   [..] Both DAC1 channels can be used to generate
        (#) Noise wave using DAC_WaveGeneration_Noise
        (#) Triangle wave using DAC_WaveGeneration_Triangle
         
   [..] Wave generation can be disabled using DAC_WaveGeneration_None
 
   [..] The DAC data format can be:
        (#) 8-bit right alignment using DAC_Align_8b_R
        (#) 12-bit left alignment using DAC_Align_12b_L
        (#) 12-bit right alignment using DAC_Align_12b_R
 
   [..] 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+ = 3.3, DAC_OUT1 = (3.3 * 868) / 4095 = 0.7V
 
   [..] 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:
        (+) DAC channel1 is mapped on DMA1 channel3 which must be already 
            configured
        (+) DAC channel2 is mapped on DMA1 channel4 which must be already 
            configured
 
                       ##### How to use this driver #####
===============================================================================
   [..]
        (+) Enable DAC APB1 clock to get write access to DAC registers
            using RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE)

        (+) Configure DACx_OUTy (DAC1_OUT1: PA4, DAC1_OUT2: PA5, DAC2_OUT1: PA6)
            in analog mode.

        (+) Configure the DAC channel using DAC_Init()

        (+) Enable the DAC channel using DAC_Cmd()

Attention

Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); You may not use this file except in compliance with the License. You may obtain a copy of the License at:

   http://www.st.com/software_license_agreement_liberty_v2

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Macros

Functions

Detailed Description

© COPYRIGHT 2012 STMicroelectronics