text: /*
   * @brief LPC13xx A/D conversion driver
   *
   * @note
   * Copyright(C) NXP Semiconductors, 2012
   * All rights reserved.
   *
   * @par
   * Software that is described herein is for illustrative purposes only
   * which provides customers with programming information regarding the
   * LPC products.  This software is supplied "AS IS" without any warranties of
   * any kind, and NXP Semiconductors and its licensor disclaim any and
   * all warranties, express or implied, including all implied warranties of
   * merchantability, fitness for a particular purpose and non-infringement of
   * intellectual property rights.  NXP Semiconductors assumes no responsibility
   * or liability for the use of the software, conveys no license or rights under any
   * patent, copyright, mask work right, or any other intellectual property rights in
   * or to any products. NXP Semiconductors reserves the right to make changes
   * in the software without notification. NXP Semiconductors also makes no
   * representation or warranty that such application will be suitable for the
   * specified use without further testing or modification.
   *
   * @par
   * Permission to use, copy, modify, and distribute this software and its
   * documentation is hereby granted, under NXP Semiconductors' and its
   * licensor's relevant copyrights 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.
   */
  
  #include "chip.h"
  
  /*****************************************************************************
   * Private types/enumerations/variables
   ****************************************************************************/
  
  /*****************************************************************************
   * Public types/enumerations/variables
   ****************************************************************************/
  
  /*****************************************************************************
   * Private functions
   ****************************************************************************/
  /* Get the number of clock for a full conversion */
  STATIC INLINE uint8_t getFullConvClk(void)
  {
  #if defined(CHIP_LPC1347)
      return 31;
  #else
  	return 11;
  #endif
  }
  
  /* Get divider value */
  STATIC uint8_t getClkDiv(LPC_ADC_T *pADC, bool burstMode, uint32_t adcRate, uint8_t clks)
  {
  	uint32_t adcBlockFreq;
  	uint32_t fullAdcRate;
  	uint8_t div;
  
  	/* The APB clock (PCLK_ADC0) is divided by (CLKDIV+1) to produce the clock for
  	   A/D converter, which should be less than or equal to 4.5MHz.
  	   A fully conversion requires (bits_accuracy+1) of these clocks.
  	   ADC Clock = PCLK_ADC0 / (CLKDIV + 1);
  	   ADC rate = ADC clock / (the number of clocks required for each conversion);
  	 */
  	adcBlockFreq = Chip_Clock_GetSystemClockRate();
  #if defined(ADC_ACC_12BITS)
  	fullAdcRate = adcRate * getFullConvClk();
  	if (clks == ADC_10BITS) {
  		fullAdcRate /= 2;
  	}
  #else
  	if (burstMode) {
  		fullAdcRate = adcRate * clks;
  	}
  	else {
  		fullAdcRate = adcRate * getFullConvClk();
  	}
  #endif
  	/* Get the round value by fomular: (2*A + B)/(2*B) */
  	div = ((adcBlockFreq * 2 + fullAdcRate) / (fullAdcRate * 2)) - 1;
  	return div;
  }
  
  /* Set start mode for ADC */
  void setStartMode(LPC_ADC_T *pADC, uint8_t start_mode)
  {
  	uint32_t temp;
  	temp = pADC->CR & (~ADC_CR_START_MASK);
  	pADC->CR = temp | (ADC_CR_START_MODE_SEL((uint32_t) start_mode));
  }
  
  /* Get the ADC value */
  Status readAdcVal(LPC_ADC_T *pADC, uint8_t channel, uint16_t *data)
  {
  	uint32_t temp;
  	temp = pADC->DR[channel];
  	if (!ADC_DR_DONE(temp)) {
  		return ERROR;
  	}
  	/*	if(ADC_DR_OVERRUN(temp) && (pADC->CR & ADC_CR_BURST)) */
  	/*	return ERROR; */
  	*data = (uint16_t) ADC_DR_RESULT(temp);
  	return SUCCESS;
  }
  
  /*****************************************************************************
   * Public functions
   ****************************************************************************/
  
  /* Initialize the ADC peripheral and the ADC setup structure to default value */
  void Chip_ADC_Init(LPC_ADC_T *pADC, ADC_CLOCK_SETUP_T *ADCSetup)
  {
  	uint8_t div;
  	uint32_t cr = 0;
  	uint32_t clk;
  
      /* Power up ADC */
      Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_ADC_PD);
  
      /* Enable ADC clock */    
      Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ADC);
  
  #if defined(ADC_TRIM_SUPPORT)
  	pADC->ADTRM = 0xF00;
  #endif
  	pADC->INTEN = 0;		/* Disable all interrupts */
  
  #if defined(CHIP_LPC1347)
  	cr |= ADC_CR_LPWRMODE;
  #else
  	cr |= ADC_CR_PDN;
  #endif
  
  	ADCSetup->adcRate = ADC_MAX_SAMPLE_RATE;
      
  #if defined(CHIP_LPC1347)
  	ADCSetup->bitsAccuracy = ADC_12BITS;
  	clk = ADC_12BITS;
  #else
  	ADCSetup->bitsAccuracy = ADC_10BITS;
  	clk = 11;
  #endif
      
  	ADCSetup->burstMode = false;
  	div = getClkDiv(pADC, false, ADCSetup->adcRate, clk);
  	cr |= ADC_CR_CLKDIV(div);
  #if !defined(ADC_ACC_12BITS)
  	cr |= ADC_CR_BITACC(ADCSetup->bitsAccuracy);
  #endif /*defined(ADC_ACC_12BITS)*/
  	pADC->CR = cr;
  }
  
  /* Shutdown ADC */
  void Chip_ADC_DeInit(LPC_ADC_T *pADC)
  {
  	pADC->INTEN = 0x00000100;
  	pADC->CR = 0;
  	Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_ADC);
      Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_ADC_PD);
  }
  
  /* Get the ADC value */
  Status Chip_ADC_ReadValue(LPC_ADC_T *pADC, uint8_t channel, uint16_t *data)
  {
  	return readAdcVal(pADC, channel, data);
  }
  
  /* Get ADC Channel status from ADC data register */
  FlagStatus Chip_ADC_ReadStatus(LPC_ADC_T *pADC, uint8_t channel, uint32_t StatusType)
  {
  	switch (StatusType) {
  	case ADC_DR_DONE_STAT:
  		return (pADC->STAT & (1UL << channel)) ? SET : RESET;
  
  	case ADC_DR_OVERRUN_STAT:
  		channel += 8;
  		return (pADC->STAT & (1UL << channel)) ? SET : RESET;
  
  	case ADC_DR_ADINT_STAT:
  		return pADC->STAT >> 16 ? SET : RESET;
  
  	default:
  		break;
  	}
  	return RESET;
  }
  
  /* Enable/Disable interrupt for ADC channel */
  void Chip_ADC_Int_SetChannelCmd(LPC_ADC_T *pADC, uint8_t channel, FunctionalState NewState)
  {
  	if (NewState == ENABLE) {
  		pADC->INTEN |= (1UL << channel);
  	}
  	else {
  		pADC->INTEN &= (~(1UL << channel));
  	}
  }
  
  /* Select the mode starting the AD conversion */
  void Chip_ADC_SetStartMode(LPC_ADC_T *pADC, ADC_START_MODE_T mode, ADC_EDGE_CFG_T EdgeOption)
  {
  	if ((mode != ADC_START_NOW) && (mode != ADC_NO_START)) {
  		if (EdgeOption) {
  			pADC->CR |= ADC_CR_EDGE;
  		}
  		else {
  			pADC->CR &= ~ADC_CR_EDGE;
  		}
  	}
  	setStartMode(pADC, (uint8_t) mode);
  }
  
  /* Set the ADC Sample rate */
  void Chip_ADC_SetSampleRate(LPC_ADC_T *pADC, ADC_CLOCK_SETUP_T *ADCSetup, uint32_t rate)
  {
  	uint8_t div;
  	uint32_t cr;
  
  	cr = pADC->CR & (~ADC_SAMPLE_RATE_CONFIG_MASK);
  	ADCSetup->adcRate = rate;
      
  #if defined(CHIP_LPC1347)
  	div = getClkDiv(pADC, ADCSetup->burstMode, rate, ADCSetup->bitsAccuracy);
  	if (ADCSetup->bitsAccuracy == ADC_10BITS) {
  		cr |= ADC_CR_MODE10BIT;
  	}
  #else
  	div = getClkDiv(pADC, ADCSetup->burstMode, rate, (11 - ADCSetup->bitsAccuracy));
  #endif
      
  	cr |= ADC_CR_CLKDIV(div);
  #if !defined(ADC_ACC_12BITS)
  	cr |= ADC_CR_BITACC(ADCSetup->bitsAccuracy);
  #endif /*defined(ADC_ACC_12BITS)*/
  	pADC->CR = cr;
  }
  
  /* Set the ADC accuracy bits */
  void Chip_ADC_SetResolution(LPC_ADC_T *pADC, ADC_CLOCK_SETUP_T *ADCSetup, ADC_RESOLUTION_T resolution)
  {
  	ADCSetup->bitsAccuracy = resolution;
  	Chip_ADC_SetSampleRate(pADC, ADCSetup, ADCSetup->adcRate);
  }
  
  /* Enable or disable the ADC channel on ADC peripheral */
  void Chip_ADC_EnableChannel(LPC_ADC_T *pADC, ADC_CHANNEL_T channel, FunctionalState NewState)
  {
  	if (NewState == ENABLE) {
  		pADC->CR |= ADC_CR_CH_SEL(channel);
  	}
  	else {
  		pADC->CR &= ~ADC_CR_START_MASK;
  		pADC->CR &= ~ADC_CR_CH_SEL(channel);
  	}
  }
  
  /* Enable burst mode */
  void Chip_ADC_SetBurstCmd(LPC_ADC_T *pADC, FunctionalState NewState)
  {
  	setStartMode(pADC, ADC_NO_START);
  
  #if defined(CHIP_LPC1347)
  	pADC->INTEN &= ~(1 << 8);
  #endif
  	if (NewState == DISABLE) {
  		pADC->CR &= ~ADC_CR_BURST;
  	}
  	else {
  		pADC->CR |= ADC_CR_BURST;
  	}
  }
  
  /* Read the ADC value and convert it to 8bits value */
  Status Chip_ADC_ReadByte(LPC_ADC_T *pADC, ADC_CHANNEL_T channel, uint8_t *data)
  {
  	uint16_t temp=0;
  	Status rt;
  
  	rt = readAdcVal(pADC, channel, &temp);
  	*data = (uint8_t) temp;
  
  	return rt;
  }
  
  