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

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/**********************************************************************
* $Id$ 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 ------------------------------ */
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