197 lines
6.7 KiB
C
197 lines
6.7 KiB
C
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/**********************************************************************
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* $Id$ lpc_dac.c 2011-06-02
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*//**
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* @file lpc_dac.c
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* @brief Contains all functions support for DAC firmware library on
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* LPC
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* @version 1.0
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* @date 02. June. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2011, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors'
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup DAC
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* @{
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc_libcfg.h"
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#else
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#include "lpc_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _DAC
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/* Includes ------------------------------------------------------------------- */
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#include "lpc_dac.h"
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#include "lpc_clkpwr.h"
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#include "lpc_pinsel.h"
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/* Private Functions ---------------------------------------------------------- */
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/*********************************************************************//**
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* @brief Get pointer to DAC peripheral
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* @param[in] compId Component ID, normally is zero (0).
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* @param[in] pinnum Pin number value, should be in range from 0..31
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* @return Pointer to DAC peripheral component
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**********************************************************************/
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static LPC_DAC_TypeDef * DAC_GetPointer(uint8_t compId)
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{
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LPC_DAC_TypeDef *pComponent = LPC_DAC;
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return pComponent;
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}
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup DAC_Public_Functions
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* @{
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*/
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/*********************************************************************//**
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* @brief Initial ADC configuration
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* - Maximum current is 700 uA
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* - Value to AOUT is 0
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* @param[in] DAC_Id the ID of the DAC component that is using, should be: zero (0)
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* @return None
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***********************************************************************/
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void DAC_Init(uint8_t DAC_Id)
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{
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/*
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* Init DAC pin connect
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* AOUT on P0.26
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*/
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PINSEL_ConfigPin(0, 26, 2);
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PINSEL_SetAnalogPinMode(0,26,ENABLE);
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//Enable DAC for the pin
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PINSEL_DacEnable(0, 26, ENABLE);
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//Set maximum current output as default
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DAC_SetBias(DAC_Id, DAC_MAX_CURRENT_700uA);
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}
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/*********************************************************************//**
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* @brief Update value to DAC
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* @param[in] DAC_Id the ID of the DAC component that is using, should be: zero (0)
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* @param[in] dac_value : value 10 bit to be converted to output
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* @return None
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***********************************************************************/
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void DAC_UpdateValue (uint8_t DAC_Id,uint32_t dac_value)
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{
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uint32_t tmp;
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LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);
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tmp = pDac->CR & DAC_BIAS_EN;
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tmp |= DAC_VALUE(dac_value);
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// Update value
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pDac->CR = tmp;
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}
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/*********************************************************************//**
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* @brief Set Maximum current for DAC
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* @param[in] DAC_Id the ID of the DAC component that is using, should be: zero (0)
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* @param[in] bias : 0 is 700 uA
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* 1 350 uA
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* @return None
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***********************************************************************/
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void DAC_SetBias (uint8_t DAC_Id, uint32_t bias)
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{
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LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);
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pDac->CR &=~DAC_BIAS_EN;
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if (bias == DAC_MAX_CURRENT_350uA)
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{
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pDac->CR |= DAC_BIAS_EN;
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}
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}
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/*********************************************************************//**
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* @brief To enable the DMA operation and control DMA timer
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* @param[in] DAC_Id the ID of the DAC component that is using, should be: zero (0)
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* @param[in] DAC_ConverterConfigStruct pointer to DAC_CONVERTER_CFG_Type
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* - DBLBUF_ENA : enable/disable DACR double buffering feature
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* - CNT_ENA : enable/disable timer out counter
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* - DMA_ENA : enable/disable DMA access
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* @return None
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***********************************************************************/
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void DAC_ConfigDAConverterControl (uint8_t DAC_Id, DAC_CONVERTER_CFG_Type *DAC_ConverterConfigStruct)
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{
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LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);
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pDac->CTRL &= ~DAC_DACCTRL_MASK;
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if (DAC_ConverterConfigStruct->DBLBUF_ENA)
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pDac->CTRL |= DAC_DBLBUF_ENA;
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if (DAC_ConverterConfigStruct->CNT_ENA)
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pDac->CTRL |= DAC_CNT_ENA;
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if (DAC_ConverterConfigStruct->DMA_ENA)
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pDac->CTRL |= DAC_DMA_ENA;
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}
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/*********************************************************************//**
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* @brief Set reload value for interrupt/DMA counter
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* @param[in] DAC_Id the ID of the DAC component that is using, should be: zero (0)
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* @param[in] time_out time out to reload for interrupt/DMA counter
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* @return None
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***********************************************************************/
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void DAC_SetDMATimeOut(uint8_t DAC_Id, uint32_t time_out)
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{
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LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);
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pDac->CNTVAL = DAC_CCNT_VALUE(time_out);
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}
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/*********************************************************************//**
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* @brief Check the interrupt/DMA counter is occured or not because of the timer counter
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* @param[in] DAC_Id the ID of the DAC component that is using, should be: zero (0)
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* @return None
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***********************************************************************/
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uint8_t DAC_IsIntRequested(uint8_t DAC_Id)
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{
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LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);
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//Return the INT_DMA_REQ bit of D/A control register
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return (pDac->CTRL & 0x01);
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}
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/**
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* @}
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*/
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#endif /*_DAC*/
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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