327 lines
11 KiB
C
327 lines
11 KiB
C
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/**********************************************************************
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* $Id$ lpc_adc.c 2011-06-02
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*//**
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* @file lpc_adc.c
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* @brief Contains all functions support for ADC 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 ADC
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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 _ADC
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/* Includes ------------------------------------------------------------------- */
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#include "lpc_types.h"
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#include "lpc_adc.h"
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#include "lpc_clkpwr.h"
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup ADC_Public_Functions
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* @{
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*/
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/*********************************************************************//**
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* @brief Initial for ADC
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* + Set bit PCADC
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* + Set clock for ADC
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* + Set Clock Frequency
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] rate ADC conversion rate, should be <=200KHz
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* @return None
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**********************************************************************/
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void ADC_Init(LPC_ADC_TypeDef *ADCx, uint32_t rate)
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{
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uint32_t ADCPClk, temp, tmp;
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// Turn on power and clock
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CLKPWR_ConfigPPWR(CLKPWR_PCONP_PCADC, ENABLE);
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ADCx->CR = 0;
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//Enable PDN bit
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tmp = ADC_CR_PDN;
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// Set clock frequency
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ADCPClk = CLKPWR_GetCLK(CLKPWR_CLKTYPE_PER);
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/* The APB clock (PCLK_ADC0) is divided by (CLKDIV+1) to produce the clock for
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* A/D converter, which should be less than or equal to 12.4MHz.
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* A fully conversion requires 31 of these clocks.
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* ADC clock = PCLK_ADC0 / (CLKDIV + 1);
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* ADC rate = ADC clock / 31;
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*/
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temp = rate * 31;
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temp = (ADCPClk * 2 + temp)/(2 * temp) - 1; //get the round value by fomular: (2*A + B)/(2*A)
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tmp |= ADC_CR_CLKDIV(temp);
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ADCx->CR = tmp;
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}
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/*********************************************************************//**
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* @brief Close ADC
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @return None
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**********************************************************************/
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void ADC_DeInit(LPC_ADC_TypeDef *ADCx)
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{
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if (ADCx->CR & ADC_CR_START_MASK) //need to stop START bits before DeInit
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ADCx->CR &= ~ADC_CR_START_MASK;
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// Clear SEL bits
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ADCx->CR &= ~0xFF;
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// Clear PDN bit
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ADCx->CR &= ~ADC_CR_PDN;
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// Turn on power and clock
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCADC, DISABLE);
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}
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/*********************************************************************//**
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* @brief Get Result conversion from A/D data register
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* @param[in] channel number which want to read back the result
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* @return Result of conversion
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*********************************************************************/
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uint32_t ADC_GetData(uint32_t channel)
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{
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uint32_t adc_value;
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adc_value = *(uint32_t *)((&LPC_ADC->DR[0]) + channel);
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return ADC_GDR_RESULT(adc_value);
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}
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/*********************************************************************//**
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* @brief Set start mode for ADC
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] start_mode Start mode choose one of modes in
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* 'ADC_START_OPT' enumeration type definition, should be:
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* - ADC_START_CONTINUOUS
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* - ADC_START_NOW
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* - ADC_START_ON_EINT0
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* - ADC_START_ON_CAP01
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* - ADC_START_ON_MAT01
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* - ADC_START_ON_MAT03
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* - ADC_START_ON_MAT10
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* - ADC_START_ON_MAT11
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* @return None
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*********************************************************************/
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void ADC_StartCmd(LPC_ADC_TypeDef *ADCx, uint8_t start_mode)
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{
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ADCx->CR &= ~ADC_CR_START_MASK;
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ADCx->CR |=ADC_CR_START_MODE_SEL((uint32_t)start_mode);
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}
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/*********************************************************************//**
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* @brief ADC Burst mode setting
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] NewState
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* - 1: Set Burst mode
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* - 0: reset Burst mode
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* @return None
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**********************************************************************/
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void ADC_BurstCmd(LPC_ADC_TypeDef *ADCx, FunctionalState NewState)
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{
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ADCx->CR &= ~ADC_CR_BURST;
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if (NewState){
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ADCx->CR |= ADC_CR_BURST;
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}
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}
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/*********************************************************************//**
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* @brief Set AD conversion in power mode
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] NewState
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* - 1: AD converter is optional
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* - 0: AD Converter is in power down mode
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* @return None
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**********************************************************************/
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void ADC_PowerdownCmd(LPC_ADC_TypeDef *ADCx, FunctionalState NewState)
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{
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ADCx->CR &= ~ADC_CR_PDN;
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if (NewState){
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ADCx->CR |= ADC_CR_PDN;
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}
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}
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/*********************************************************************//**
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* @brief Set Edge start configuration
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] EdgeOption is ADC_START_ON_RISING and ADC_START_ON_FALLING
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* 0:ADC_START_ON_RISING
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* 1:ADC_START_ON_FALLING
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* @return None
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**********************************************************************/
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void ADC_EdgeStartConfig(LPC_ADC_TypeDef *ADCx, uint8_t EdgeOption)
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{
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ADCx->CR &= ~ADC_CR_EDGE;
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if (EdgeOption){
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ADCx->CR |= ADC_CR_EDGE;
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}
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}
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/*********************************************************************//**
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* @brief ADC interrupt configuration
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] IntType: type of interrupt, should be:
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* - ADC_ADINTEN0: Interrupt channel 0
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* - ADC_ADINTEN1: Interrupt channel 1
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* ...
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* - ADC_ADINTEN7: Interrupt channel 7
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* - ADC_ADGINTEN: Individual channel/global flag done generate an interrupt
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* @param[in] NewState:
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* - SET : enable ADC interrupt
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* - RESET: disable ADC interrupt
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* @return None
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**********************************************************************/
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void ADC_IntConfig (LPC_ADC_TypeDef *ADCx, ADC_TYPE_INT_OPT IntType, FunctionalState NewState)
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{
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ADCx->INTEN &= ~ADC_INTEN_CH(IntType);
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if (NewState){
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ADCx->INTEN |= ADC_INTEN_CH(IntType);
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}
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}
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/*********************************************************************//**
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* @brief Enable/Disable ADC channel number
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] Channel channel number
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* @param[in] NewState Enable or Disable
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*
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* @return None
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**********************************************************************/
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void ADC_ChannelCmd (LPC_ADC_TypeDef *ADCx, uint8_t Channel, FunctionalState NewState)
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{
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if (NewState == ENABLE) {
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ADCx->CR |= ADC_CR_CH_SEL(Channel);
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} else {
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if (ADCx->CR & ADC_CR_START_MASK) //need to stop START bits before disable channel
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ADCx->CR &= ~ADC_CR_START_MASK;
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ADCx->CR &= ~ADC_CR_CH_SEL(Channel);
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}
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}
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/*********************************************************************//**
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* @brief Get ADC result
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] channel: channel number, should be 0...7
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* @return Data conversion
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**********************************************************************/
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uint16_t ADC_ChannelGetData(LPC_ADC_TypeDef *ADCx, uint8_t channel)
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{
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uint32_t adc_value;
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adc_value = *(uint32_t *) ((&ADCx->DR[0]) + channel);
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return ADC_DR_RESULT(adc_value);
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}
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/*********************************************************************//**
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* @brief Get ADC Chanel status from ADC data register
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] channel: channel number, should be 0..7
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* @param[in] StatusType
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* 0:Burst status
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* 1:Done status
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* @return SET / RESET
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**********************************************************************/
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FlagStatus ADC_ChannelGetStatus(LPC_ADC_TypeDef *ADCx, uint8_t channel, uint32_t StatusType)
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{
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uint32_t temp;
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temp = *(uint32_t *) ((&ADCx->DR[0]) + channel);
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if (StatusType)
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{
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temp &= ADC_DR_DONE_FLAG;
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}
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else
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{
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temp &= ADC_DR_OVERRUN_FLAG;
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}
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if (temp)
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{
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return SET;
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}
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else
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{
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return RESET;
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}
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}
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/*********************************************************************//**
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* @brief Get ADC Data from AD Global register
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @return Result of conversion
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**********************************************************************/
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uint32_t ADC_GlobalGetData(LPC_ADC_TypeDef *ADCx)
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{
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return ((uint32_t)(ADCx->GDR));
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}
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/*********************************************************************//**
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* @brief Get ADC Chanel status from AD global data register
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* @param[in] ADCx pointer to LPC_ADC_TypeDef, should be: LPC_ADC
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* @param[in] StatusType
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* 0:Burst status
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* 1:Done status
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* @return SET / RESET
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**********************************************************************/
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FlagStatus ADC_GlobalGetStatus(LPC_ADC_TypeDef *ADCx, uint32_t StatusType)
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{
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uint32_t temp;
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temp = ADCx->GDR;
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if (StatusType){
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temp &= ADC_DR_DONE_FLAG;
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}else{
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temp &= ADC_DR_OVERRUN_FLAG;
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}
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if (temp){
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return SET;
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}else{
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return RESET;
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}
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}
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/**
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* @}
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*/
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#endif /*_ADC*/
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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