lpc17xx_dac.c

00001 /**
00002  * @file    : lpc17xx_dac.c
00003  * @brief   : Contains all functions support for DAC firmware library on LPC17xx
00004  * @version : 1.0
00005  * @date    : 3. April. 2009
00006  * @author  : HieuNguyen
00007  **************************************************************************
00008  * Software that is described herein is for illustrative purposes only
00009  * which provides customers with programming information regarding the
00010  * products. This software is supplied "AS IS" without any warranties.
00011  * NXP Semiconductors assumes no responsibility or liability for the
00012  * use of the software, conveys no license or title under any patent,
00013  * copyright, or mask work right to the product. NXP Semiconductors
00014  * reserves the right to make changes in the software without
00015  * notification. NXP Semiconductors also make no representation or
00016  * warranty that such application will be suitable for the specified
00017  * use without further testing or modification.
00018  **********************************************************************/
00019 
00020 /* Peripheral group ----------------------------------------------------------- */
00021 /** @addtogroup DAC
00022  * @{
00023  */
00024 
00025 /* Includes ------------------------------------------------------------------- */
00026 #include "lpc17xx_dac.h"
00027 #include "lpc17xx_clkpwr.h"
00028 
00029 /* If this source file built with example, the LPC17xx FW library configuration
00030  * file in each example directory ("lpc17xx_libcfg.h") must be included,
00031  * otherwise the default FW library configuration file must be included instead
00032  */
00033 #ifdef __BUILD_WITH_EXAMPLE__
00034 #include "lpc17xx_libcfg.h"
00035 #else
00036 #include "lpc17xx_libcfg_default.h"
00037 #endif /* __BUILD_WITH_EXAMPLE__ */
00038 
00039 
00040 #ifdef _DAC
00041 
00042 /* Public Functions ----------------------------------------------------------- */
00043 /** @addtogroup DAC_Public_Functions
00044  * @{
00045  */
00046 
00047 /*********************************************************************//**
00048  * @brief       Initial ADC configuration
00049  *                  - Maximum   current is 700 uA
00050  *                  - Value to AOUT is 0
00051  * @param[in]   DACx pointer to LPC_DAC_TypeDef
00052  * @return      None
00053  ***********************************************************************/
00054 void    DAC_Init(LPC_DAC_TypeDef *DACx)
00055 {
00056     CHECK_PARAM(PARAM_DACx(DACx));
00057     /* Set default clock divider for DAC */
00058     // CLKPWR_SetPCLKDiv (CLKPWR_PCLKSEL_DAC, CLKPWR_PCLKSEL_CCLK_DIV_4);
00059     //Set maximum current output
00060     DAC_SetBias(LPC_DAC,DAC_MAX_CURRENT_700uA );
00061 
00062 
00063 }
00064 
00065 /*********************************************************************//**
00066  * @brief       Update value to DAC
00067  * @param[in]   DACx pointer to LPC_DAC_TypeDef
00068  * @param[in]   dac_value : value 10 bit to be converted to output
00069  * @return      None
00070  ***********************************************************************/
00071 void    DAC_UpdateValue (LPC_DAC_TypeDef *DACx,uint32_t dac_value)
00072 {
00073     uint32_t tmp;
00074     CHECK_PARAM(PARAM_DACx(DACx));
00075     tmp = DACx->DACR & DAC_BIAS_EN;
00076     tmp |= DAC_VALUE(dac_value);
00077     //DACx->DACR    &= ~DAC_VALUE(0x3FF);
00078     //DACx->DACR    |=  DAC_VALUE(dac_value);
00079     // Update value
00080     DACx->DACR = tmp;
00081 }
00082 
00083 /*********************************************************************//**
00084  * @brief       Set Maximum current for DAC
00085  * @param[in]   DACx pointer to LPC_DAC_TypeDef
00086  * @param[in]   bias : 0 is 700 uA
00087  *                     1    350 uA
00088  * @return      None
00089  ***********************************************************************/
00090 void    DAC_SetBias (LPC_DAC_TypeDef *DACx,uint32_t bias)
00091 {
00092     CHECK_PARAM(PARAM_DAC_CURRENT_OPT(bias));
00093     DACx->DACR &=~DAC_BIAS_EN;
00094     if (bias  == DAC_MAX_CURRENT_350uA )
00095     {
00096         DACx->DACR |= DAC_BIAS_EN;
00097     }
00098 }
00099 /*********************************************************************//**
00100  * @brief       To enable the DMA operation and control DMA timer
00101  * @param[in]   DACx pointer to LPC_DAC_TypeDef
00102  * @param[in]   DAC_ConverterConfigStruct pointer to DAC_CONVERTER_CFG_Type
00103  *                  - DBLBUF_ENA :  enable/disable DACR double buffering feature
00104  *                  - CNT_ENA    :  enable/disable timer out counter
00105  *                  - DMA_ENA    :  enable/disable DMA access
00106  * @return      None
00107  ***********************************************************************/
00108 void    DAC_ConfigDAConverterControl (LPC_DAC_TypeDef *DACx,DAC_CONVERTER_CFG_Type *DAC_ConverterConfigStruct)
00109 {
00110     CHECK_PARAM(PARAM_DACx(DACx));
00111     DACx->DACCTRL &= ~DAC_DACCTRL_MASK;
00112     if (DAC_ConverterConfigStruct->DBLBUF_ENA)
00113         DACx->DACCTRL   |= DAC_DBLBUF_ENA;
00114     if (DAC_ConverterConfigStruct->CNT_ENA )
00115         DACx->DACCTRL   |= DAC_CNT_ENA;
00116     if (DAC_ConverterConfigStruct->DMA_ENA )
00117         DACx->DACCTRL   |= DAC_DMA_ENA;
00118 }
00119 /*********************************************************************//**
00120  * @brief       Set reload value for interrupt/DMA counter
00121  * @param[in]   DACx pointer to LPC_DAC_TypeDef
00122  * @param[in]   time_out time out to reload for interrupt/DMA counter
00123  * @return      None
00124  ***********************************************************************/
00125 void    DAC_SetDMATimeOut(LPC_DAC_TypeDef *DACx, uint32_t time_out)
00126 {
00127     CHECK_PARAM(PARAM_DACx(DACx));
00128     DACx->DACCNTVAL = DAC_CCNT_VALUE(time_out);
00129 }
00130 
00131 /**
00132  * @}
00133  */
00134 
00135 #endif /* _DAC */
00136 
00137 /**
00138  * @}
00139  */
00140 
00141 /* --------------------------------- End Of File ------------------------------ */