131 lines
4.6 KiB
C
131 lines
4.6 KiB
C
/*
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* @brief LPC8xx Analog comparator driver
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*
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* Copyright(C) NXP Semiconductors, 2012
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* All rights reserved.
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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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* 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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* 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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/*****************************************************************************
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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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/* Initializes the ACMP */
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void Chip_ACMP_Init(LPC_CMP_T *pACMP)
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{
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Chip_SYSCTL_PowerUp(SYSCTL_SLPWAKE_ACMP_PD);
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ACOMP);
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}
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/* De-initializes the ACMP */
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void Chip_ACMP_Deinit(LPC_CMP_T *pACMP)
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{
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Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_ACOMP);
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Chip_SYSCTL_PowerDown(SYSCTL_SLPWAKE_ACMP_PD);
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}
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/* Clears the ACMP interrupt (EDGECLR bit) */
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void Chip_ACMP_EdgeClear(LPC_CMP_T *pACMP)
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{
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uint32_t reg = pACMP->CTRL & ~ACMP_CTRL_RESERVED;
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/* Toggle EDGECLR bit high and then low */
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pACMP->CTRL = reg | ACMP_EDGECLR_BIT;
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pACMP->CTRL = reg & ~ACMP_EDGECLR_BIT;
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}
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/* Sets up ACMP edge selection */
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void Chip_ACMP_SetEdgeSelection(LPC_CMP_T *pACMP, ACMP_EDGESEL_T edgeSel)
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{
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uint32_t reg = pACMP->CTRL & ~(ACMP_EDGESEL_MASK | ACMP_CTRL_RESERVED);
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/* Select edge for COMPEDGE */
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pACMP->CTRL = reg | (uint32_t) edgeSel;
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}
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/* Selects positive voltage input */
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void Chip_ACMP_SetPosVoltRef(LPC_CMP_T *pACMP, ACMP_POS_INPUT_T Posinput)
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{
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uint32_t reg = pACMP->CTRL & ~(ACMP_COMPVPSEL_MASK | ACMP_CTRL_RESERVED);
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/* Select positive input */
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pACMP->CTRL = reg | (uint32_t) Posinput;
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}
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/* Selects negative voltage input */
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void Chip_ACMP_SetNegVoltRef(LPC_CMP_T *pACMP, ACMP_NEG_INPUT_T Neginput)
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{
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uint32_t reg = pACMP->CTRL & ~(ACMP_COMPVMSEL_MASK | ACMP_CTRL_RESERVED);
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/* Select negative input */
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pACMP->CTRL = reg | (uint32_t) Neginput;
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}
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/* Selects hysteresis level */
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void Chip_ACMP_SetHysteresis(LPC_CMP_T *pACMP, ACMP_HYS_T hys)
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{
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uint32_t reg = pACMP->CTRL & ~(ACMP_HYSTERESIS_MASK | ACMP_CTRL_RESERVED);
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/* Select negative input */
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pACMP->CTRL = reg | (uint32_t) hys;
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}
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/* Helper function for setting up ACMP control */
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void Chip_ACMP_SetupAMCPRefs(LPC_CMP_T *pACMP, ACMP_EDGESEL_T edgeSel,
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ACMP_POS_INPUT_T Posinput, ACMP_NEG_INPUT_T Neginput,
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ACMP_HYS_T hys)
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{
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uint32_t reg = pACMP->CTRL & ~(ACMP_HYSTERESIS_MASK | ACMP_CTRL_RESERVED |
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ACMP_COMPVMSEL_MASK | ACMP_COMPVPSEL_MASK | ACMP_EDGESEL_MASK);
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/* Select negative input */
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pACMP->CTRL = reg | (uint32_t) edgeSel | (uint32_t) Posinput |
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(uint32_t) Neginput | (uint32_t) hys;
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}
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/* Sets up voltage ladder */
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void Chip_ACMP_SetupVoltLadder(LPC_CMP_T *pACMP, uint32_t ladsel, bool ladrefVDDCMP)
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{
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uint32_t reg = pACMP->LAD & ~(ACMP_LADSEL_MASK | ACMP_LADREF_MASK | ACMP_LAD_RESERVED);
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/* Setup voltage ladder and ladder reference */
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if (ladrefVDDCMP) {
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reg |= ACMP_LADREF_MASK;
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}
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pACMP->LAD = reg | (ladsel << 1);
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}
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