147 lines
6.0 KiB
C
147 lines
6.0 KiB
C
/*
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* @brief LPC15xx Analog comparator driver
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*
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* Copyright(C) NXP Semiconductors, 2014
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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_POWERDOWN_ACMP0_PD | SYSCTL_POWERDOWN_ACMP1_PD |
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SYSCTL_POWERDOWN_ACMP2_PD | SYSCTL_POWERDOWN_ACMP3_PD);
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ACMP);
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Chip_SYSCTL_PeriphReset(RESET_ACMP);
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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_ACMP);
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Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_ACMP0_PD | SYSCTL_POWERDOWN_ACMP1_PD |
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SYSCTL_POWERDOWN_ACMP2_PD | SYSCTL_POWERDOWN_ACMP3_PD);
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}
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/*Sets up ACMP edge selection */
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void Chip_ACMP_SetIntEdgeSelection(LPC_CMP_T *pACMP, uint8_t index, CHIP_ACMP_EDGESEL_T edgeSel)
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{
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/* Make sure interrupt flag is not set during read OR/AND and write operation */
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uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_INTEDGE_MASK;
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pACMP->ACMP[index].CMP = 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, uint8_t index, CHIP_ACMP_POS_INPUT_T Posinput)
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{
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/* Make sure interrupt flag is not set during read OR/AND and write operation */
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uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_COMPVPSEL_MASK;
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/* Select positive input */
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pACMP->ACMP[index].CMP = 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, uint8_t index, CHIP_ACMP_NEG_INPUT_T Neginput)
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{
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/* Make sure interrupt flag is not set during read OR/AND and write operation */
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uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_COMPVMSEL_MASK;
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/* Select negative input */
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pACMP->ACMP[index].CMP = 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, uint8_t index, CHIP_ACMP_HYS_T hys)
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{
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/* Make sure interrupt flag is not set during read OR/AND and write operation */
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uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~ACMP_HYSTERESIS_MASK;
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pACMP->ACMP[index].CMP = reg | (uint32_t) hys;
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}
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/*Helper function for setting up ACMP voltage settings */
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void Chip_ACMP_SetupACMPRefs(LPC_CMP_T *pACMP, uint8_t index, CHIP_ACMP_POS_INPUT_T Posinput,
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CHIP_ACMP_NEG_INPUT_T Neginput, CHIP_ACMP_HYS_T hys)
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{
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/* Make sure interrupt flag is not set during read OR/AND and write operation */
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uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~(ACMP_HYSTERESIS_MASK |
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ACMP_COMPVMSEL_MASK | ACMP_COMPVPSEL_MASK);
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pACMP->ACMP[index].CMP = reg | (uint32_t) Posinput | (uint32_t) Neginput | (uint32_t) hys;
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}
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/*Helper function for setting up ACMP interrupt settings */
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void Chip_ACMP_SetupACMPInt(LPC_CMP_T *pACMP, uint8_t index, bool level,
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bool invert, CHIP_ACMP_EDGESEL_T edgeSel)
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{
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/* Make sure interrupt flag is not set during read OR/AND and write operation */
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uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~(ACMP_INTPOL_BIT |
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ACMP_INTTYPE_BIT | ACMP_INTEDGE_MASK);
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/* For Level triggered interrupt, invert sets the polarity
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For edge triggered interrupt edgeSel sets the edge type */
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if (level) {
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reg |= ACMP_INTTYPE_BIT;
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if (invert) {
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reg |= ACMP_INTPOL_BIT;
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}
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}
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else {
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reg |= (uint32_t) edgeSel;
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}
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pACMP->ACMP[index].CMP = reg;
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}
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/*Sets up voltage ladder */
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void Chip_ACMP_SetupVoltLadder(LPC_CMP_T *pACMP, uint8_t index, uint32_t ladsel, bool ladrefVDDCMP)
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{
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/* Make sure interrupt flag is not set during read OR/AND and write operation */
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uint32_t reg = (pACMP->ACMP[index].CMP & ~ACMP_INTFLAG_BIT) & ~(ACMP_LADSEL_MASK | ACMP_LADREF_BIT);
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/* Setup voltage ladder and ladder reference */
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if (!ladrefVDDCMP) {
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reg |= ACMP_LADREF_BIT;
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}
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pACMP->ACMP[index].CMP = reg | (ladsel << 24);
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}
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