rt-thread/bsp/lpc408x/Libraries/Drivers/source/lpc_adc.c

/**********************************************************************
* $Id$      lpc_adc.c           2011-06-02
*//**
* @file     lpc_adc.c
* @brief    Contains all functions support for ADC firmware library on
*           LPC
* @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 ADC
 * @{
 */
#ifdef __BUILD_WITH_EXAMPLE__
#include "lpc_libcfg.h"
#else
#include "lpc_libcfg_default.h"
#endif /* __BUILD_WITH_EXAMPLE__ */
#ifdef _ADC
 
/* Includes ------------------------------------------------------------------- */
#include "lpc_types.h"
#include "lpc_adc.h"
#include "lpc_clkpwr.h"

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

/*********************************************************************//**
 * @brief       Initial for ADC
 *                  + Set bit PCADC
 *                  + Set clock for ADC
 *                  + Set Clock Frequency
 * @param[in]   ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
 * @param[in]   rate ADC conversion rate, should be <=200KHz
 * @return      None
 **********************************************************************/
void ADC_Init(LPC_ADC_TypeDef *ADCx, uint32_t rate)
{
    uint32_t ADCPClk, temp, tmp;

    // Turn on power and clock
    CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCADC, ENABLE);

    ADCx->CR = 0;

    //Enable PDN bit
    tmp = ADC_CR_PDN;

    // Set clock frequency
    ADCPClk = CLKPWR_GetCLK(CLKPWR_CLKTYPE_PER);

    /* 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 12.4MHz.
     * A fully conversion requires 31 of these clocks.
     * ADC clock = PCLK_ADC0 / (CLKDIV + 1);
     * ADC rate = ADC clock / 31;
     */
    temp = rate * 31;
    temp = (ADCPClk * 2 + temp)/(2 * temp) - 1; //get the round value by fomular: (2*A + B)/(2*A)
    tmp |=  ADC_CR_CLKDIV(temp);

    ADCx->CR = tmp;
}


/*********************************************************************//**
* @brief        Close ADC
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @return       None
**********************************************************************/
void ADC_DeInit(LPC_ADC_TypeDef *ADCx)
{
    if (ADCx->CR & ADC_CR_START_MASK) //need to stop START bits before DeInit
        ADCx->CR &= ~ADC_CR_START_MASK;
     // Clear SEL bits
     ADCx->CR &= ~0xFF;

    // Clear PDN bit
    ADCx->CR &= ~ADC_CR_PDN;
    // Turn on power and clock
    CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCADC, DISABLE);
}


/*********************************************************************//**
* @brief        Get Result conversion from A/D data register
* @param[in]    channel number which want to read back the result
* @return       Result of conversion
*********************************************************************/
uint32_t ADC_GetData(uint32_t channel)
{
    uint32_t adc_value;

    adc_value = *(uint32_t *)((&LPC_ADC->DR[0]) + channel);
    return ADC_GDR_RESULT(adc_value);
}

/*********************************************************************//**
* @brief        Set start mode for ADC
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    start_mode Start mode choose one of modes in
*               'ADC_START_OPT' enumeration type definition, should be:
*               - ADC_START_CONTINUOUS
*               - ADC_START_NOW
*               - ADC_START_ON_EINT0
*               - ADC_START_ON_CAP01
*               - ADC_START_ON_MAT01
*               - ADC_START_ON_MAT03
*               - ADC_START_ON_MAT10
*               - ADC_START_ON_MAT11
* @return       None
*********************************************************************/
void ADC_StartCmd(LPC_ADC_TypeDef *ADCx, uint8_t start_mode)
{
    ADCx->CR &= ~ADC_CR_START_MASK;
    ADCx->CR |=ADC_CR_START_MODE_SEL((uint32_t)start_mode);
}


/*********************************************************************//**
* @brief        ADC Burst mode setting
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    NewState
*               -   1: Set Burst mode
*               -   0: reset Burst mode
* @return       None
**********************************************************************/
void ADC_BurstCmd(LPC_ADC_TypeDef *ADCx, FunctionalState NewState)
{
    ADCx->CR &= ~ADC_CR_BURST;
    if (NewState){
        ADCx->CR |= ADC_CR_BURST;
    }
}

/*********************************************************************//**
* @brief        Set AD conversion in power mode
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    NewState
*               -   1: AD converter is optional
*               -   0: AD Converter is in power down mode
* @return       None
**********************************************************************/
void ADC_PowerdownCmd(LPC_ADC_TypeDef *ADCx, FunctionalState NewState)
{
    ADCx->CR &= ~ADC_CR_PDN;
    if (NewState){
        ADCx->CR |= ADC_CR_PDN;
    }
}

/*********************************************************************//**
* @brief        Set Edge start configuration
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    EdgeOption is ADC_START_ON_RISING and ADC_START_ON_FALLING
*                   0:ADC_START_ON_RISING
*                   1:ADC_START_ON_FALLING
* @return       None
**********************************************************************/
void ADC_EdgeStartConfig(LPC_ADC_TypeDef *ADCx, uint8_t EdgeOption)
{
    ADCx->CR &= ~ADC_CR_EDGE;
    if (EdgeOption){
        ADCx->CR |= ADC_CR_EDGE;
    }
}

/*********************************************************************//**
* @brief        ADC interrupt configuration
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    IntType: type of interrupt, should be:
*               - ADC_ADINTEN0: Interrupt channel 0
*               - ADC_ADINTEN1: Interrupt channel 1
*               ...
*               - ADC_ADINTEN7: Interrupt channel 7
*               - ADC_ADGINTEN: Individual channel/global flag done generate an interrupt
* @param[in]    NewState:
*                   - SET : enable ADC interrupt
*                   - RESET: disable ADC interrupt
* @return       None
**********************************************************************/
void ADC_IntConfig (LPC_ADC_TypeDef *ADCx, ADC_TYPE_INT_OPT IntType, FunctionalState NewState)
{
    ADCx->INTEN &= ~ADC_INTEN_CH(IntType);
    if (NewState){
        ADCx->INTEN |= ADC_INTEN_CH(IntType);
    }
}

/*********************************************************************//**
* @brief        Enable/Disable ADC channel number
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    Channel channel number
* @param[in]    NewState Enable or Disable
*
* @return       None
**********************************************************************/
void ADC_ChannelCmd (LPC_ADC_TypeDef *ADCx, uint8_t Channel, FunctionalState NewState)
{
    if (NewState == ENABLE) {
        ADCx->CR |= ADC_CR_CH_SEL(Channel);
    } else {        
        if (ADCx->CR & ADC_CR_START_MASK) //need to stop START bits before disable channel
           ADCx->CR &= ~ADC_CR_START_MASK;
        ADCx->CR &= ~ADC_CR_CH_SEL(Channel);
    }
}

/*********************************************************************//**
* @brief        Get ADC result
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    channel: channel number, should be 0...7
* @return       Data conversion
**********************************************************************/
uint16_t ADC_ChannelGetData(LPC_ADC_TypeDef *ADCx, uint8_t channel)
{
    uint32_t adc_value;
    adc_value = *(uint32_t *) ((&ADCx->DR[0]) + channel);
    return ADC_DR_RESULT(adc_value);
}

/*********************************************************************//**
* @brief        Get ADC Chanel status from ADC data register
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    channel: channel number, should be 0..7
* @param[in]    StatusType
*                       0:Burst status
*                       1:Done  status
* @return       SET / RESET
**********************************************************************/
FlagStatus ADC_ChannelGetStatus(LPC_ADC_TypeDef *ADCx, uint8_t channel, uint32_t StatusType)
{
    uint32_t temp;
    temp =  *(uint32_t *) ((&ADCx->DR[0]) + channel);
    if (StatusType)
    {
        temp &= ADC_DR_DONE_FLAG;
    }
    else
    {
        temp &= ADC_DR_OVERRUN_FLAG;
    }

    if (temp)
    {
        return SET;
    }
    else
    {
        return RESET;
    }

}

/*********************************************************************//**
* @brief        Get ADC Data from AD Global register
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @return       Result of conversion
**********************************************************************/
uint32_t ADC_GlobalGetData(LPC_ADC_TypeDef *ADCx)
{
    return ((uint32_t)(ADCx->GDR));
}

/*********************************************************************//**
* @brief        Get ADC Chanel status from AD global data register
* @param[in]    ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
* @param[in]    StatusType
*                       0:Burst status
*                       1:Done  status
* @return       SET / RESET
**********************************************************************/
FlagStatus  ADC_GlobalGetStatus(LPC_ADC_TypeDef *ADCx, uint32_t StatusType)
{
    uint32_t temp;

    temp =  ADCx->GDR;
    if (StatusType){
        temp &= ADC_DR_DONE_FLAG;
    }else{
        temp &= ADC_DR_OVERRUN_FLAG;
    }
    if (temp){
        return SET;
    }else{
        return RESET;
    }
}

/**
 * @}
 */
#endif /*_ADC*/

/**
 * @}
 */

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