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/*
* @brief LPC8xx Analog comparator driver
*
* Copyright(C) NXP Semiconductors, 2012
* All rights reserved.
*
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* LPC products. This software is supplied "AS IS" without any warranties of
* any kind, and NXP Semiconductors and its licensor disclaim any and
* all warranties, express or implied, including all implied warranties of
* merchantability, fitness for a particular purpose and non-infringement of
* intellectual property rights. NXP Semiconductors assumes no responsibility
* or liability for the use of the software, conveys no license or rights under any
* patent, copyright, mask work right, or any other intellectual property rights in
* or to any products. NXP Semiconductors reserves the right to make changes
* in the software without notification. NXP Semiconductors also makes 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' and its
* licensor's relevant copyrights 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.
*/
#include "chip.h"
/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Private functions
****************************************************************************/
/*****************************************************************************
* Public functions
****************************************************************************/
/* Initializes the ACMP */
void Chip_ACMP_Init(LPC_CMP_T *pACMP)
{
Chip_SYSCTL_PowerUp(SYSCTL_SLPWAKE_ACMP_PD);
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ACOMP);
}
/* De-initializes the ACMP */
void Chip_ACMP_Deinit(LPC_CMP_T *pACMP)
{
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_ACOMP);
Chip_SYSCTL_PowerDown(SYSCTL_SLPWAKE_ACMP_PD);
}
/* Clears the ACMP interrupt (EDGECLR bit) */
void Chip_ACMP_EdgeClear(LPC_CMP_T *pACMP)
{
uint32_t reg = pACMP->CTRL & ~ACMP_CTRL_RESERVED;
/* Toggle EDGECLR bit high and then low */
pACMP->CTRL = reg | ACMP_EDGECLR_BIT;
pACMP->CTRL = reg & ~ACMP_EDGECLR_BIT;
}
/* Sets up ACMP edge selection */
void Chip_ACMP_SetEdgeSelection(LPC_CMP_T *pACMP, ACMP_EDGESEL_T edgeSel)
{
uint32_t reg = pACMP->CTRL & ~(ACMP_EDGESEL_MASK | ACMP_CTRL_RESERVED);
/* Select edge for COMPEDGE */
pACMP->CTRL = reg | (uint32_t) edgeSel;
}
/* Selects positive voltage input */
void Chip_ACMP_SetPosVoltRef(LPC_CMP_T *pACMP, ACMP_POS_INPUT_T Posinput)
{
uint32_t reg = pACMP->CTRL & ~(ACMP_COMPVPSEL_MASK | ACMP_CTRL_RESERVED);
/* Select positive input */
pACMP->CTRL = reg | (uint32_t) Posinput;
}
/* Selects negative voltage input */
void Chip_ACMP_SetNegVoltRef(LPC_CMP_T *pACMP, ACMP_NEG_INPUT_T Neginput)
{
uint32_t reg = pACMP->CTRL & ~(ACMP_COMPVMSEL_MASK | ACMP_CTRL_RESERVED);
/* Select negative input */
pACMP->CTRL = reg | (uint32_t) Neginput;
}
/* Selects hysteresis level */
void Chip_ACMP_SetHysteresis(LPC_CMP_T *pACMP, ACMP_HYS_T hys)
{
uint32_t reg = pACMP->CTRL & ~(ACMP_HYSTERESIS_MASK | ACMP_CTRL_RESERVED);
/* Select negative input */
pACMP->CTRL = reg | (uint32_t) hys;
}
/* Helper function for setting up ACMP control */
void Chip_ACMP_SetupAMCPRefs(LPC_CMP_T *pACMP, ACMP_EDGESEL_T edgeSel,
ACMP_POS_INPUT_T Posinput, ACMP_NEG_INPUT_T Neginput,
ACMP_HYS_T hys)
{
uint32_t reg = pACMP->CTRL & ~(ACMP_HYSTERESIS_MASK | ACMP_CTRL_RESERVED |
ACMP_COMPVMSEL_MASK | ACMP_COMPVPSEL_MASK | ACMP_EDGESEL_MASK);
/* Select negative input */
pACMP->CTRL = reg | (uint32_t) edgeSel | (uint32_t) Posinput |
(uint32_t) Neginput | (uint32_t) hys;
}
/* Sets up voltage ladder */
void Chip_ACMP_SetupVoltLadder(LPC_CMP_T *pACMP, uint32_t ladsel, bool ladrefVDDCMP)
{
uint32_t reg = pACMP->LAD & ~(ACMP_LADSEL_MASK | ACMP_LADREF_MASK | ACMP_LAD_RESERVED);
/* Setup voltage ladder and ladder reference */
if (ladrefVDDCMP) {
reg |= ACMP_LADREF_MASK;
}
pACMP->LAD = reg | (ladsel << 1);
}
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