/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : stm32f10x_dac.c
* Author             : MCD Application Team
* Version            : V2.0.3
* Date               : 09/22/2008
* Description        : This file provides all the DAC firmware functions.
********************************************************************************
* 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.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_dac.h"
#include "stm32f10x_rcc.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* DAC EN mask */
#define CR_EN_Set                  ((u32)0x00000001)

/* DAC DMAEN mask */
#define CR_DMAEN_Set               ((u32)0x00001000)

/* CR register Mask */
#define CR_CLEAR_Mask              ((u32)0x00000FFE)

/* DAC SWTRIG mask */
#define SWTRIGR_SWTRIG_Set         ((u32)0x00000001)

/* DAC Dual Channels SWTRIG masks */
#define DUAL_SWTRIG_Set            ((u32)0x00000003)
#define DUAL_SWTRIG_Reset          ((u32)0xFFFFFFFC)

/* DHR registers offsets */
#define DHR12R1_Offset             ((u32)0x00000008)
#define DHR12R2_Offset             ((u32)0x00000014)
#define DHR12RD_Offset             ((u32)0x00000020)

/* DOR register offset */
#define DOR_Offset                 ((u32)0x0000002C)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name  : DAC_DeInit
* Description    : Deinitializes the DAC peripheral registers to their default
*                  reset values.
* Input          : None.
* Output         : None
* Return         : 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);
}

/*******************************************************************************
* Function Name  : DAC_Init
* Description    : Initializes the DAC peripheral according to the specified 
*                  parameters in the DAC_InitStruct.
* Input          : - DAC_Channel: the selected DAC channel. 
*                    This parameter can be one of the following values:
*                       - DAC_Channel_1: DAC Channel1 selected
*                       - DAC_Channel_2: DAC Channel2 selected
*                  - DAC_InitStruct: pointer to a DAC_InitTypeDef structure that
*                    contains the configuration information for the specified
*                    DAC channel.
* Output         : None
* Return         : None
*******************************************************************************/
void DAC_Init(u32 DAC_Channel, DAC_InitTypeDef* DAC_InitStruct)
{
  u32 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 genration,
     mask/amplitude for wave genration */
  /* 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;
}

/*******************************************************************************
* Function Name  : DAC_StructInit
* Description    : Fills each DAC_InitStruct member with its default value.
* Input          : - DAC_InitStruct : pointer to a DAC_InitTypeDef structure
*                    which will be initialized.
* Output         : None
* Return         : 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;
}

/*******************************************************************************
* Function Name  : DAC_Cmd
* Description    : Enables or disables the specified DAC channel.
* Input            - DAC_Channel: the selected DAC channel. 
*                    This parameter can be one of the following values:
*                       - DAC_Channel_1: DAC Channel1 selected
*                       - DAC_Channel_2: DAC Channel2 selected
*                  - NewState: new state of the DAC channel. 
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void DAC_Cmd(u32 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 |= CR_EN_Set << DAC_Channel;
  }
  else
  {
    /* Disable the selected DAC channel */
    DAC->CR &= ~(CR_EN_Set << DAC_Channel);
  }
}

/*******************************************************************************
* Function Name  : DAC_DMACmd
* Description    : Enables or disables the specified DAC channel DMA request.
* Input            - DAC_Channel: the selected DAC channel. 
*                    This parameter can be one of the following values:
*                       - DAC_Channel_1: DAC Channel1 selected
*                       - DAC_Channel_2: DAC Channel2 selected
*                  - NewState: new state of the selected DAC channel DMA request.
*                    This parameter can be: ENABLE or DISABLE.
* Output         : None
* Return         : None
*******************************************************************************/
void DAC_DMACmd(u32 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 |= CR_DMAEN_Set << DAC_Channel;
  }
  else
  {
    /* Disable the selected DAC channel DMA request */
    DAC->CR &= ~(CR_DMAEN_Set << DAC_Channel);
  }
}

/*******************************************************************************
* Function Name  : DAC_SoftwareTriggerCmd