92 lines
3.2 KiB
C
92 lines
3.2 KiB
C
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/*
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* @brief LPC82x ADC driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2014
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* All rights reserved.
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*
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* @par
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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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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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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' and its
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* licensor's relevant copyrights 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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#include "chip.h"
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#include "adc_8xx.h"
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Initialize the ADC peripheral */
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void Chip_ADC_Init(LPC_ADC_T *pADC, uint32_t flags)
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{
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/* Power up ADC and enable ADC base clock */
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Chip_SYSCTL_PowerUp(SYSCTL_SLPWAKE_ADC_PD);
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ADC);
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/* Disable ADC interrupts */
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pADC->INTEN = 0;
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/* Set ADC control options */
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pADC->CTRL = flags;
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}
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/* Shutdown ADC */
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void Chip_ADC_DeInit(LPC_ADC_T *pADC)
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{
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pADC->INTEN = 0;
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pADC->CTRL = 0;
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/* Stop ADC clock and then power down ADC */
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Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_ADC);
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Chip_SYSCTL_PowerDown(SYSCTL_SLPWAKE_ADC_PD);
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}
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/* Start ADC calibration */
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void Chip_ADC_StartCalibration(LPC_ADC_T *pADC)
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{
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/* Set calibration mode */
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pADC->CTRL |= ADC_CR_CALMODEBIT;
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/* Clear ASYNC bit */
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pADC->CTRL &= ~ADC_CR_ASYNMODE;
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/* Setup ADC for about 500KHz (per UM) */
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Chip_ADC_SetClockRate(pADC, 500000);
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/* Clearn low power bit */
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pADC->CTRL &= ~ADC_CR_LPWRMODEBIT;
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/* Calibration is only complete when ADC_CR_CALMODEBIT bit has cleared */
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}
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