lpc177x_8x_dac.c

NXPl788上lwip的无操作系统移植,基于Embest开发板

/**********************************************************************
* $Id$		lpc177x_8x_dac.c			2011-06-02
*//**
* @file		lpc177x_8x_dac.c
* @brief	Contains all functions support for DAC firmware library on
*			LPC177x_8x
* @version	1.0
* @date		02. June. 2011
* @author	NXP MCU SW Application Team
* 
* Copyright(C) 2011, NXP Semiconductor
* All rights reserved.
*
***********************************************************************
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* products. This software is supplied "AS IS" without any warranties.
* NXP Semiconductors assumes no responsibility or liability for the
* use of the software, conveys no license or title under any patent,
* copyright, or mask work right to the product. NXP Semiconductors
* reserves the right to make changes in the software without
* notification. NXP Semiconductors also make no representation or
* warranty that such application will be suitable for the specified
* use without further testing or modification.
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors'
* relevant copyright in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers.  This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
**********************************************************************/

/* Peripheral group ----------------------------------------------------------- */
/** @addtogroup DAC
 * @{
 */
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc177x_8x_libcfg.h"
#else
#include "lpc177x_8x_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */
#ifdef _DAC

/* Includes ------------------------------------------------------------------- */
#include "lpc177x_8x_dac.h"
#include "lpc177x_8x_clkpwr.h"
#include "lpc177x_8x_pinsel.h"

/* Private Functions ---------------------------------------------------------- */

/*********************************************************************//**
 * @brief		Get pointer to DAC peripheral
 * @param[in]	compId		Component ID, normally is zero (0).
 * @param[in]	pinnum		Pin number value, should be in range from 0..31
 * @return		Pointer to DAC peripheral component
 **********************************************************************/
static LPC_DAC_TypeDef * DAC_GetPointer(uint8_t compId)
{
	LPC_DAC_TypeDef *pComponent = LPC_DAC;

	return pComponent;
}



/* Public Functions ----------------------------------------------------------- */
/** @addtogroup DAC_Public_Functions
 * @{
 */

/*********************************************************************//**
 * @brief 		Initial ADC configuration
 * 					- Maximum	current is 700 uA
 * 					- Value to AOUT is 0
 * @param[in] 	DAC_Id 	the ID of the DAC component that is using, should be: zero (0)
 * @return 		None
 ***********************************************************************/
void DAC_Init(uint8_t DAC_Id)
{
	/*
	 * Init DAC pin connect
	 * AOUT on P0.26
	 */
	PINSEL_ConfigPin(0, 26, 2);								 

	PINSEL_SetAnalogPinMode(0,26,ENABLE);

	//Enable DAC for the pin
	PINSEL_DacEnable(0, 26, ENABLE);

	//Set maximum current output as default
	DAC_SetBias(DAC_Id, DAC_MAX_CURRENT_700uA);
}

/*********************************************************************//**
 * @brief 		Update value to DAC
 * @param[in] 	DAC_Id 	the ID of the DAC component that is using, should be: zero (0)
 * @param[in] 	dac_value : value 10 bit to be converted to output
 * @return 		None
 ***********************************************************************/
void DAC_UpdateValue (uint8_t DAC_Id,uint32_t dac_value)
{
	uint32_t tmp;

	LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);

	tmp = pDac->CR & DAC_BIAS_EN;

	tmp |= DAC_VALUE(dac_value);

	// Update value
	pDac->CR = tmp;
}

/*********************************************************************//**
 * @brief 		Set Maximum current for DAC
 * @param[in] 	DAC_Id 	the ID of the DAC component that is using, should be: zero (0)
 * @param[in] 	bias : 0 is 700 uA
 * 					   1    350 uA
 * @return 		None
 ***********************************************************************/
void DAC_SetBias (uint8_t DAC_Id, uint32_t bias)
{
	LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);

	pDac->CR &=~DAC_BIAS_EN;

	if (bias  == DAC_MAX_CURRENT_350uA)
	{
		pDac->CR |= DAC_BIAS_EN;
	}
}

/*********************************************************************//**
 * @brief 		To enable the DMA operation and control DMA timer
 * @param[in]	DAC_Id 	the ID of the DAC component that is using, should be: zero (0)
 * @param[in] 	DAC_ConverterConfigStruct pointer to DAC_CONVERTER_CFG_Type
 * 					- DBLBUF_ENA :  enable/disable DACR double buffering feature
 * 					- CNT_ENA    :  enable/disable timer out counter
 * 					- DMA_ENA    :	enable/disable DMA access
 * @return 		None
 ***********************************************************************/
void DAC_ConfigDAConverterControl (uint8_t DAC_Id, DAC_CONVERTER_CFG_Type *DAC_ConverterConfigStruct)
{
	LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);

	pDac->CTRL &= ~DAC_DACCTRL_MASK;

	if (DAC_ConverterConfigStruct->DBLBUF_ENA)
		pDac->CTRL	|= DAC_DBLBUF_ENA;

	if (DAC_ConverterConfigStruct->CNT_ENA)
		pDac->CTRL	|= DAC_CNT_ENA;

	if (DAC_ConverterConfigStruct->DMA_ENA)
		pDac->CTRL	|= DAC_DMA_ENA;
}

/*********************************************************************//**
 * @brief 		Set reload value for interrupt/DMA counter
 * @param[in] 	DAC_Id 	the ID of the DAC component that is using, should be: zero (0)
 * @param[in] 	time_out time out to reload for interrupt/DMA counter
 * @return 		None
 ***********************************************************************/
void DAC_SetDMATimeOut(uint8_t DAC_Id, uint32_t time_out)
{
	LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);

	pDac->CNTVAL = DAC_CCNT_VALUE(time_out);
}


/*********************************************************************//**
 * @brief 		Check the interrupt/DMA counter is occured or not because of the timer counter
 * @param[in] 	DAC_Id 	the ID of the DAC component that is using, should be: zero (0)
 * @return 		None
 ***********************************************************************/
uint8_t DAC_IsIntRequested(uint8_t DAC_Id)
{
	LPC_DAC_TypeDef* pDac = DAC_GetPointer(DAC_Id);

	//Return the INT_DMA_REQ bit of D/A control register
	return (pDac->CTRL & 0x01);
}


/**
 * @}
 */
#endif /*_DAC*/

/**
 * @}
 */

/* --------------------------------- End Of File ------------------------------ */