550 lines
25 KiB
C
550 lines
25 KiB
C
/*
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* @brief LPC11u6x ADC driver
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2013
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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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#ifndef __ADC_11U6X_H_
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#define __ADC_11U6X_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** @defgroup ADC_11U6X CHIP: LPC11u6x A/D conversion driver
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* @ingroup CHIP_11U6X_Drivers
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* @{
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*/
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/** Sequence index enumerations, used in various parts of the code for
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register indexing and sequencer selection */
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typedef enum {
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ADC_SEQA_IDX,
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ADC_SEQB_IDX
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} ADC_SEQ_IDX_T;
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/**
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* @brief ADC register block structure
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*/
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typedef struct { /*!< ADCn Structure */
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__IO uint32_t CTRL; /*!< A/D Control Register. The AD0CR register must be written to select the operating mode before A/D conversion can occur. */
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__I uint32_t RESERVED0;
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__IO uint32_t SEQ_CTRL[ADC_SEQB_IDX + 1]; /*!< A/D Sequence A & B Control Register. Controls triggering and channel selection for sonversion sequence. */
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__IO uint32_t SEQ_GDAT[ADC_SEQB_IDX + 1]; /*!< A/D Sequence A & B Global Data Register. Contains the result of the most recent A/D conversion for sequence. */
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__I uint32_t RESERVED1[2];
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__I uint32_t DR[12]; /*!< A/D Channel Data Register. This register contains the result of the most recent conversion completed on channel n. */
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__IO uint32_t THR_LOW[2]; /*!< A/D Low Compare Threshold Register 0 & 1. Contains the lower threshold level for automatic threshold comparison. */
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__IO uint32_t THR_HIGH[2]; /*!< A/D High Compare Threshold Register 0 & 1. Contains the higher threshold level for automatic threshold comparison. */
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__IO uint32_t CHAN_THRSEL; /*!< A/D Channel Threshold Select Register. Specifies which set of threshold compare registers to use. */
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__IO uint32_t INTEN; /*!< A/D Interrupt Enable Register. This register contains enable bits that enable sequence-A, sequence-B, threshold compare and overrun interrupts. */
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__IO uint32_t FLAGS; /*!< A/D Flags Register. This register contains interrupt flags. - To be checked */
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__IO uint32_t TRM; /*!< A/D Trim Register. */
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} LPC_ADC_T;
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/** Maximum clock rate in Hz (12-bit conversions) */
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#define ADC_MAX_CLOCK_RATE 50000000
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#define ADC_CALIBRATE_RATE 500000
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/**
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* @brief ADC register support bitfields and mask
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*/
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/** ADC Control register bit fields */
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#define ADC_CR_CLKDIV_MASK (0xFF << 0) /*!< Mask for Clock divider value */
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#define ADC_CR_CLKDIV_BITPOS (0) /*!< Bit position for Clock divider value */
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#define ADC_CR_MODE10BIT (1 << 9) /*!< 10-bit mode enable bit */
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#define ADC_CR_LPWRMODEBIT (1 << 10) /*!< Low power mode enable bit */
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#define ADC_CR_CALMODEBIT (1 << 30) /*!< Self calibration cycle enable bit */
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#define ADC_CR_BITACC(n) ((((n) & 0x1) << 9)) /*!< 12-bit or 10-bit ADC accuracy */
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#define ADC_CR_CLKDIV(n) ((((n) & 0xFF) << 0)) /*!< The APB clock (PCLK) is divided by (this value plus one) to produce the clock for the A/D */
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#define ADC_SAMPLE_RATE_CONFIG_MASK (ADC_CR_CLKDIV(0xFF) | ADC_CR_BITACC(0x01))
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/** ADC Sequence Control register bit fields */
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#define ADC_SEQ_CTRL_CHANSEL(n) (1 << (n)) /*!< Channel select macro */
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#define ADC_SEQ_CTRL_CHANSEL_MASK (0xFFF) /*!< Channel select mask */
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/** ADC hardware trigger sources in SEQ_CTRL */
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#define ADC_SEQ_CTRL_HWTRIG_ARM_TXEV (0 << 12) /*!< HW trigger input - ARM TXEV */
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#define ADC_SEQ_CTRL_HWTRIG_CT32B0_MAT0 (1 << 12) /*!< HW trigger input - Match output 0 of CT32B0 */
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#define ADC_SEQ_CTRL_HWTRIG_CT32B0_MAT1 (2 << 12) /*!< HW trigger input - Match output 1 of CT32B1 or SCT_OUT0 */
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#define ADC_SEQ_CTRL_HWTRIG_SCT_OUT0 (2 << 12) /*!< HW trigger input - Match output 1 of CT32B1 or SCT_OUT0 */
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#define ADC_SEQ_CTRL_HWTRIG_CT16B0_MAT0 (3 << 12) /*!< HW trigger input - Match output 0 of CT16B0 */
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#define ADC_SEQ_CTRL_HWTRIG_CT16B0_MAT1 (4 << 12) /*!< HW trigger input - Match output 1 of CT16B1 or SCT_OUT1 */
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#define ADC_SEQ_CTRL_HWTRIG_SCT_OUT1 (4 << 12) /*!< HW trigger input - Match output 1 of CT16B1 or SCT_OUT1 */
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#define ADC_SEQ_CTRL_HWTRIG_CT16B0_CAP0 (5 << 12) /*!< HW trigger input - Capture input 0 of CT16B0 */
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#define ADC_SEQ_CTRL_HWTRIG_CT16B1_CAP0 (6 << 12) /*!< HW trigger input - Capture input 0 of CT16B1 */
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#define ADC_SEQ_CTRL_HWTRIG_CT32B0_CAP0 (7 << 12) /*!< HW trigger input - Capture input 0 of CT32B1 */
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#define ADC_SEQ_CTRL_HWTRIG_MASK (0x3F << 12) /*!< HW trigger input bitfield mask */
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/** SEQ_CTRL register bit fields */
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#define ADC_SEQ_CTRL_HWTRIG_POLPOS (1 << 18) /*!< HW trigger polarity - positive edge */
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#define ADC_SEQ_CTRL_HWTRIG_SYNCBYPASS (1 << 19) /*!< HW trigger bypass synchronisation */
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#define ADC_SEQ_CTRL_START (1 << 26) /*!< Start conversion enable bit */
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#define ADC_SEQ_CTRL_BURST (1 << 27) /*!< Repeated conversion enable bit */
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#define ADC_SEQ_CTRL_SINGLESTEP (1 << 28) /*!< Single step enable bit */
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#define ADC_SEQ_CTRL_LOWPRIO (1 << 29) /*!< High priority enable bit (regardless of name) */
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#define ADC_SEQ_CTRL_MODE_EOS (1 << 30) /*!< Mode End of sequence enable bit */
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#define ADC_SEQ_CTRL_SEQ_ENA (1UL << 31) /*!< Sequence enable bit */
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/** ADC global data register bit fields */
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#define ADC_SEQ_GDAT_RESULT_MASK (0xFFF << 4) /*!< Result value mask */
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#define ADC_SEQ_GDAT_RESULT_BITPOS (4) /*!< Result start bit position */
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#define ADC_SEQ_GDAT_THCMPRANGE_MASK (0x3 << 16) /*!< Comparion range mask */
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#define ADC_SEQ_GDAT_THCMPRANGE_BITPOS (16) /*!< Comparison range bit position */
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#define ADC_SEQ_GDAT_THCMPCROSS_MASK (0x3 << 18) /*!< Comparion cross mask */
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#define ADC_SEQ_GDAT_THCMPCROSS_BITPOS (18) /*!< Comparison cross bit position */
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#define ADC_SEQ_GDAT_CHAN_MASK (0xF << 26) /*!< Channel number mask */
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#define ADC_SEQ_GDAT_CHAN_BITPOS (26) /*!< Channel number bit position */
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#define ADC_SEQ_GDAT_OVERRUN (1 << 30) /*!< Overrun bit */
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#define ADC_SEQ_GDAT_DATAVALID (1UL << 31) /*!< Data valid bit */
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/** ADC Data register bit fields */
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#define ADC_DR_RESULT(n) ((((n) >> 4) & 0xFFF)) /*!< Macro for getting the ADC data value */
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#define ADC_DR_THCMPRANGE_MASK (0x3 << 16) /*!< Comparion range mask */
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#define ADC_DR_THCMPRANGE_BITPOS (16) /*!< Comparison range bit position */
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#define ADC_DR_THCMPRANGE(n) (((n) >> ADC_DR_THCMPRANGE_BITPOS) & 0x3)
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#define ADC_DR_THCMPCROSS_MASK (0x3 << 18) /*!< Comparion cross mask */
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#define ADC_DR_THCMPCROSS_BITPOS (18) /*!< Comparison cross bit position */
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#define ADC_DR_THCMPCROSS(n) (((n) >> ADC_DR_THCMPCROSS_BITPOS) & 0x3)
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#define ADC_DR_CHAN_MASK (0xF << 26) /*!< Channel number mask */
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#define ADC_DR_CHAN_BITPOS (26) /*!< Channel number bit position */
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#define ADC_DR_CHANNEL(n) (((n) >> ADC_DR_CHAN_BITPOS) & 0xF) /*!< Channel number bit position */
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#define ADC_DR_OVERRUN (1 << 30) /*!< Overrun bit */
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#define ADC_DR_DATAVALID (1UL << 31) /*!< Data valid bit */
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#define ADC_DR_DONE(n) (((n) >> 31))
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/** ADC low/high Threshold register bit fields */
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#define ADC_THR_VAL_MASK (0xFFF << 4) /*!< Threshold value bit mask */
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#define ADC_THR_VAL_POS (4) /*!< Threshold value bit position */
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/** ADC Threshold select register bit fields */
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#define ADC_THRSEL_CHAN_SEL_THR1(n) (1 << (n)) /*!< Select THR1 register for channel n */
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/** ADC Interrupt Enable register bit fields */
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#define ADC_INTEN_SEQA_ENABLE (1 << 0) /*!< Sequence A Interrupt enable bit */
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#define ADC_INTEN_SEQB_ENABLE (1 << 1) /*!< Sequence B Interrupt enable bit */
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#define ADC_INTEN_SEQN_ENABLE(seq) (1 << (seq)) /*!< Sequence A/B Interrupt enable bit */
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#define ADC_INTEN_OVRRUN_ENABLE (1 << 2) /*!< Overrun Interrupt enable bit */
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#define ADC_INTEN_CMP_DISBALE (0) /*!< Disable comparison interrupt value */
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#define ADC_INTEN_CMP_OUTSIDETH (1) /*!< Outside threshold interrupt value */
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#define ADC_INTEN_CMP_CROSSTH (2) /*!< Crossing threshold interrupt value */
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#define ADC_INTEN_CMP_MASK (3) /*!< Comparison interrupt value mask */
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#define ADC_INTEN_CMP_ENABLE(isel, ch) (((isel) & ADC_INTEN_CMP_MASK) << ((2 * (ch)) + 3)) /*!< Interrupt selection for channel */
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/** ADC Flags register bit fields */
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#define ADC_FLAGS_THCMP_MASK(ch) (1 << (ch)) /*!< Threshold comparison status for channel */
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#define ADC_FLAGS_OVRRUN_MASK(ch) (1 << (12 + (ch))) /*!< Overrun status for channel */
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#define ADC_FLAGS_SEQA_OVRRUN_MASK (1 << 24) /*!< Seq A Overrun status */
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#define ADC_FLAGS_SEQB_OVRRUN_MASK (1 << 25) /*!< Seq B Overrun status */
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#define ADC_FLAGS_SEQN_OVRRUN_MASK(seq) (1 << (24 + (seq))) /*!< Seq A/B Overrun status */
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#define ADC_FLAGS_SEQA_INT_MASK (1 << 28) /*!< Seq A Interrupt status */
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#define ADC_FLAGS_SEQB_INT_MASK (1 << 29) /*!< Seq B Interrupt status */
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#define ADC_FLAGS_SEQN_INT_MASK(seq) (1 << (28 + (seq)))/*!< Seq A/B Interrupt status */
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#define ADC_FLAGS_THCMP_INT_MASK (1 << 30) /*!< Threshold comparison Interrupt status */
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#define ADC_FLAGS_OVRRUN_INT_MASK (1UL << 31) /*!< Overrun Interrupt status */
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/** ADC Trim register bit fields */
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#define ADC_TRIM_VRANGE_HIGHV (0 << 5) /*!< Voltage range bit - High volatge (2.7V to 3.6V) */
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#define ADC_TRIM_VRANGE_LOWV (1 << 5) /*!< Voltage range bit - Low volatge (1.8V to 2.7V) */
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/**
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* @brief Initialize the ADC peripheral
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* @param pADC : The base of ADC peripheral on the chip
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* @param flags : ADC flags for init (ADC_CR_MODE10BIT and/or ADC_CR_LPWRMODEBIT)
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* @return Nothing
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* @note To select low-power ADC mode, enable the ADC_CR_LPWRMODEBIT flag.
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* To select 10-bit conversion mode, enable the ADC_CR_MODE10BIT flag.<br>
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* Example: Chip_ADC_Init(LPC_ADC, (ADC_CR_MODE10BIT | ADC_CR_LPWRMODEBIT));
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*/
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void Chip_ADC_Init(LPC_ADC_T *pADC, uint32_t flags);
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/**
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* @brief Shutdown ADC
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* @param pADC : The base of ADC peripheral on the chip
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* @return Nothing
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* @note Disables the ADC clocks and ADC power
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*/
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void Chip_ADC_DeInit(LPC_ADC_T *pADC);
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/**
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* @brief Set ADC divider
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* @param pADC : The base of ADC peripheral on the chip
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* @param div : ADC divider value to set minus 1
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* @return Nothing
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* @note The value is used as a divider to generate the ADC
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* clock rate from the ADC input clock. The ADC input clock is based
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* on the system clock. Valid values for this function are from 0 to 255
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* with 0=divide by 1, 1=divide by 2, 2=divide by 3, etc.<br>
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* Do not decrement this value by 1.<br>
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* To set the ADC clock rate to 1MHz, use the following function:<br>
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* Chip_ADC_SetDivider(LPC_ADC, (Chip_Clock_GetSystemClockRate() / 1000000) - 1);
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*/
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STATIC INLINE void Chip_ADC_SetDivider(LPC_ADC_T *pADC, uint8_t div)
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{
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uint32_t temp;
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temp = pADC->CTRL & ~(ADC_CR_CLKDIV_MASK);
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pADC->CTRL = temp | (uint32_t) div;
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}
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/**
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* @brief Set ADC clock rate
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* @param pADC : The base of ADC peripheral on the chip
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* @param rate : rate in Hz to set ADC clock to (maximum ADC_MAX_SAMPLE_RATE)
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* @return Nothing
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*/
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void Chip_ADC_SetClockRate(LPC_ADC_T *pADC, uint32_t rate);
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/**
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* @brief Get ADC divider
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* @param pADC : The base of ADC peripheral on the chip
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* @return the current ADC divider
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* @note This function returns the divider that is used to generate the
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* ADC frequency. The returned value must be incremented by 1. The
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* frequency can be determined with the following function:<br>
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* adc_freq = Chip_Clock_GetSystemClockRate() / (Chip_ADC_GetDivider(LPC_ADC) + 1);
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*/
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STATIC INLINE uint8_t Chip_ADC_GetDivider(LPC_ADC_T *pADC)
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{
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return pADC->CTRL & ADC_CR_CLKDIV_MASK;
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}
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/**
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* @brief Start ADC calibration
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* @param pADC : The base of ADC peripheral on the chip
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* @return Nothing
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* @note Calibration is not done as part of Chip_ADC_Init(), but
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* is required after the call to Chip_ADC_Init() or after returning
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* from a power-down state.
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*/
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void Chip_ADC_StartCalibration(LPC_ADC_T *pADC);
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/**
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* @brief Check if ADC calibration is done
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* @param pADC : The base of ADC peripheral on the chip
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* @return TRUE if calibration is complete, otherwise FALSE.
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*/
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bool Chip_ADC_IsCalibrationDone(LPC_ADC_T *pADC);
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/**
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* @brief Helper function for safely setting ADC sequencer register bits
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to set bits for
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* @param bits : Or'ed bits of a sequencer register to set
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* @return Nothing
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* @note This function will safely set the ADC sequencer register bits
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* while maintaining bits 20..25 as 0, regardless of the read state of those bits.
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*/
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void Chip_ADC_SetSequencerBits(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex, uint32_t bits);
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/**
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* @brief Helper function for safely clearing ADC sequencer register bits
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to clear bits for
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* @param bits : Or'ed bits of a sequencer register to clear
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* @return Nothing
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* @note This function will safely clear the ADC sequencer register bits
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* while maintaining bits 20..25 as 0, regardless of the read state of those bits.
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*/
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void Chip_ADC_ClearSequencerBits(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex, uint32_t bits);
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/**
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* @brief Sets up ADC conversion sequencer A or B
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to setup
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* @param options : OR'ed Sequencer options to setup (see notes)
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* @return Nothing
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* @note Sets up sequencer options for a conversion sequence. This function
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* should be used to setup the selected channels for the sequence, the sequencer
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* trigger, the trigger polarity, synchronization bypass, priority, and mode. All
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* options are passed to the functions as a OR'ed list of values. This function will
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* disable/clear the sequencer start/burst/single step/enable if they are enabled.<br>
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* Select the channels by OR'ing in one or more ADC_SEQ_CTRL_CHANSEL(ch) values.<br>
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* Select the hardware trigger by OR'ing in one ADC_SEQ_CTRL_HWTRIG_* value.<br>
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* Select a positive edge hardware trigger by OR'ing in ADC_SEQ_CTRL_HWTRIG_POLPOS.<br>
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* Select trigger bypass synchronisation by OR'ing in ADC_SEQ_CTRL_HWTRIG_SYNCBYPASS.<br>
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* Select ADC single step on trigger/start by OR'ing in ADC_SEQ_CTRL_SINGLESTEP.<br>
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* Select higher priority conversion on the other sequencer by OR'ing in ADC_SEQ_CTRL_LOWPRIO.<br>
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* Select end of seqeuence instead of end of conversion interrupt by OR'ing in ADC_SEQ_CTRL_MODE_EOS.<br>
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* Example for setting up sequencer A (channels 0-2, trigger on high edge of PIO0_2, interrupt on end of sequence):<br>
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* Chip_ADC_SetupSequencer(LPC_ADC, ADC_SEQA_IDX, (
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* ADC_SEQ_CTRL_CHANSEL(0) | ADC_SEQ_CTRL_CHANSEL(1) | ADC_SEQ_CTRL_CHANSEL(2) |
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* ADC_SEQ_CTRL_HWTRIG_PIO0_2 | ADC_SEQ_CTRL_HWTRIG_POLPOS | ADC_SEQ_CTRL_MODE_EOS));
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*/
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STATIC INLINE void Chip_ADC_SetupSequencer(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex, uint32_t options)
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{
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pADC->SEQ_CTRL[seqIndex] = options;
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}
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/**
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* @brief Enables a sequencer
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to enable
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* @return Nothing
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*/
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STATIC INLINE void Chip_ADC_EnableSequencer(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex)
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{
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Chip_ADC_SetSequencerBits(pADC, seqIndex, ADC_SEQ_CTRL_SEQ_ENA);
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}
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/**
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* @brief Disables a sequencer
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to disable
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* @return Nothing
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*/
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STATIC INLINE void Chip_ADC_DisableSequencer(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex)
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{
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Chip_ADC_ClearSequencerBits(pADC, seqIndex, ADC_SEQ_CTRL_SEQ_ENA);
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}
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/**
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* @brief Forces a sequencer trigger event (software trigger of ADC)
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to start
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* @return Nothing
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* @note This function sets the START bit for the sequencer to force a
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* single conversion sequence or a single step conversion.
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*/
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STATIC INLINE void Chip_ADC_StartSequencer(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex)
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{
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Chip_ADC_SetSequencerBits(pADC, seqIndex, ADC_SEQ_CTRL_START);
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}
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/**
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* @brief Starts sequencer burst mode
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to start burst on
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* @return Nothing
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* @note This function sets the BURST bit for the sequencer to force
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* continuous conversion. Use Chip_ADC_StopBurstSequencer() to stop the
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* ADC burst sequence.
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*/
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STATIC INLINE void Chip_ADC_StartBurstSequencer(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex)
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{
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Chip_ADC_SetSequencerBits(pADC, seqIndex, ADC_SEQ_CTRL_BURST);
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}
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/**
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* @brief Stops sequencer burst mode
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to stop burst on
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* @return Nothing
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*/
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STATIC INLINE void Chip_ADC_StopBurstSequencer(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex)
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{
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Chip_ADC_ClearSequencerBits(pADC, seqIndex, ADC_SEQ_CTRL_BURST);
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}
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/** ADC sequence global data register threshold comparison range enumerations */
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typedef enum {
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ADC_DR_THCMPRANGE_INRANGE,
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ADC_DR_THCMPRANGE_RESERVED,
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ADC_DR_THCMPRANGE_BELOW,
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ADC_DR_THCMPRANGE_ABOVE
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} ADC_DR_THCMPRANGE_T;
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/** ADC sequence global data register threshold comparison cross enumerations */
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typedef enum {
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ADC_DR_THCMPCROSS_NOCROSS,
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ADC_DR_THCMPCROSS_RESERVED,
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ADC_DR_THCMPCROSS_DOWNWARD,
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ADC_DR_THCMPCROSS_UPWARD
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} ADC_DR_THCMPCROSS_T;
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/**
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* @brief Read a ADC sequence global data register
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* @param pADC : The base of ADC peripheral on the chip
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* @param seqIndex : Sequencer to read
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* @return Current raw value of the ADC sequence A or B global data register
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* @note This function returns the raw value of the data register and clears
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* the overrun and datavalid status for the register. Once this register is read,
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* the following functions can be used to parse the raw value:<br>
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* uint32_t adcDataRawValue = Chip_ADC_ReadSequencerDataReg(LPC_ADC, ADC_SEQA_IDX); // Get raw value
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* uint32_t adcDataValue = ADC_DR_RESULT(adcDataRawValue); // Aligned and masked ADC data value
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* ADC_DR_THCMPRANGE_T adcRange = (ADC_DR_THCMPRANGE_T) ADC_DR_THCMPRANGE(adcDataRawValue); // Sample range compared to threshold low/high
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* ADC_DR_THCMPCROSS_T adcRange = (ADC_DR_THCMPCROSS_T) ADC_DR_THCMPCROSS(adcDataRawValue); // Sample cross compared to threshold low
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* uint32_t channel = ADC_DR_CHANNEL(adcDataRawValue); // ADC channel for this sample/data
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* bool adcDataOverrun = (bool) ((adcDataRawValue & ADC_DR_OVERRUN) != 0); // Data overrun flag
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* bool adcDataValid = (bool) ((adcDataRawValue & ADC_SEQ_GDAT_DATAVALID) != 0); // Data valid flag
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*/
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STATIC INLINE uint32_t Chip_ADC_GetSequencerDataReg(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex)
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{
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return pADC->SEQ_GDAT[seqIndex];
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}
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/**
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* @brief Read a ADC data register
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* @param pADC : The base of ADC peripheral on the chip
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* @param index : Data register to read, 1-8
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* @return Current raw value of the ADC data register
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* @note This function returns the raw value of the data register and clears
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* the overrun and datavalid status for the register. Once this register is read,
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* the following functions can be used to parse the raw value:<br>
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* uint32_t adcDataRawValue = Chip_ADC_ReadSequencerDataReg(LPC_ADC, ADC_SEQA_IDX); // Get raw value
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* uint32_t adcDataValue = ADC_DR_RESULT(adcDataRawValue); // Aligned and masked ADC data value
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* ADC_DR_THCMPRANGE_T adcRange = (ADC_DR_THCMPRANGE_T) ADC_DR_THCMPRANGE(adcDataRawValue); // Sample range compared to threshold low/high
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* ADC_DR_THCMPCROSS_T adcRange = (ADC_DR_THCMPCROSS_T) ADC_DR_THCMPCROSS(adcDataRawValue); // Sample cross compared to threshold low
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* uint32_t channel = ADC_DR_CHANNEL(adcDataRawValue); // ADC channel for this sample/data
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* bool adcDataOverrun = (bool) ((adcDataRawValue & ADC_DR_OVERRUN) != 0); // Data overrun flag
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* bool adcDataValid = (bool) ((adcDataRawValue & ADC_SEQ_GDAT_DATAVALID) != 0); // Data valid flag
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*/
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STATIC INLINE uint32_t Chip_ADC_GetDataReg(LPC_ADC_T *pADC, uint8_t index)
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{
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return pADC->DR[index];
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}
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/**
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* @brief Set Threshold low value in ADC
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* @param pADC : The base of ADC peripheral on the chip
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* @param thrnum : Threshold register value (1 for threshold register 1, 0 for threshold register 0)
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* @param value : Threshold low data value (should be 12-bit value)
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* @return None
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*/
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STATIC INLINE void Chip_ADC_SetThrLowValue(LPC_ADC_T *pADC, uint8_t thrnum, uint16_t value)
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{
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pADC->THR_LOW[thrnum] = (((uint32_t) value) << ADC_THR_VAL_POS);
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}
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/**
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* @brief Set Threshold high value in ADC
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* @param pADC : The base of ADC peripheral on the chip
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* @param thrnum : Threshold register value (1 for threshold register 1, 0 for threshold register 0)
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* @param value : Threshold high data value (should be 12-bit value)
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* @return None
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*/
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STATIC INLINE void Chip_ADC_SetThrHighValue(LPC_ADC_T *pADC, uint8_t thrnum, uint16_t value)
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{
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pADC->THR_HIGH[thrnum] = (((uint32_t) value) << ADC_THR_VAL_POS);
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}
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/**
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* @brief Select threshold 0 values for comparison for selected channels
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* @param pADC : The base of ADC peripheral on the chip
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* @param channels : An OR'ed value of one or more ADC_THRSEL_CHAN_SEL_THR1(ch) values
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* @return None
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* @note Select multiple channels to use the threshold 0 comparison.<br>
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* Example:<br>
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* Chip_ADC_SelectTH0Channels(LPC_ADC, (ADC_THRSEL_CHAN_SEL_THR1(1) | ADC_THRSEL_CHAN_SEL_THR1(2))); // Selects channels 1 and 2 for threshold 0
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*/
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void Chip_ADC_SelectTH0Channels(LPC_ADC_T *pADC, uint32_t channels);
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/**
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* @brief Select threshold 1 value for comparison for selected channels
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* @param pADC : The base of ADC peripheral on the chip
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* @param channels : An OR'ed value of one or more ADC_THRSEL_CHAN_SEL_THR1(ch) values
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* @return None
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* @note Select multiple channels to use the 1 threshold comparison.<br>
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* Example:<br>
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* Chip_ADC_SelectTH1Channels(LPC_ADC, (ADC_THRSEL_CHAN_SEL_THR1(4) | ADC_THRSEL_CHAN_SEL_THR1(5))); // Selects channels 4 and 5 for 1 threshold
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*/
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void Chip_ADC_SelectTH1Channels(LPC_ADC_T *pADC, uint32_t channels);
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/**
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* @brief Enable interrupts in ADC (sequencers A/B and overrun)
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* @param pADC : The base of ADC peripheral on the chip
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* @param intMask : Interrupt values to be enabled (see notes)
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* @return None
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* @note Select one or more OR'ed values of ADC_INTEN_SEQA_ENABLE,
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* ADC_INTEN_SEQB_ENABLE, and ADC_INTEN_OVRRUN_ENABLE to enable the
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* specific ADC interrupts.
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*/
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void Chip_ADC_EnableInt(LPC_ADC_T *pADC, uint32_t intMask);
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/**
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* @brief Disable interrupts in ADC (sequencers A/B and overrun)
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* @param pADC : The base of ADC peripheral on the chip
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* @param intMask : Interrupt values to be disabled (see notes)
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* @return None
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* @note Select one or more OR'ed values of ADC_INTEN_SEQA_ENABLE,
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* ADC_INTEN_SEQB_ENABLE, and ADC_INTEN_OVRRUN_ENABLE to disable the
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* specific ADC interrupts.
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*/
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void Chip_ADC_DisableInt(LPC_ADC_T *pADC, uint32_t intMask);
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/** Threshold interrupt event options */
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typedef enum {
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ADC_INTEN_THCMP_DISABLE,
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ADC_INTEN_THCMP_OUTSIDE,
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ADC_INTEN_THCMP_CROSSING,
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} ADC_INTEN_THCMP_T;
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/**
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* @brief Enable a threshold event interrupt in ADC
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* @param pADC : The base of ADC peripheral on the chip
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* @param ch : ADC channel to set threshold inetrrupt for, 1-8
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* @param thInt : Selected threshold interrupt type
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* @return None
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*/
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void Chip_ADC_SetThresholdInt(LPC_ADC_T *pADC, uint8_t ch, ADC_INTEN_THCMP_T thInt);
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/**
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* @brief Get flags register in ADC
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* @param pADC : The base of ADC peripheral on the chip
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* @return Flags register value (ORed ADC_FLAG* values)
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* @note Mask the return value of this function with the ADC_FLAGS_*
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* definitions to determine the overall ADC interrupt events.<br>
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* Example:<br>
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* if (Chip_ADC_GetFlags(LPC_ADC) & ADC_FLAGS_THCMP_MASK(3) // Check of threshold comp status for ADC channel 3
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*/
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STATIC INLINE uint32_t Chip_ADC_GetFlags(LPC_ADC_T *pADC)
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{
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return pADC->FLAGS;
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}
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/**
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* @brief Clear flags register in ADC
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* @param pADC : The base of ADC peripheral on the chip
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* @param flags : An Or'ed values of ADC_FLAGS_* values to clear
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* @return Flags register value (ORed ADC_FLAG* values)
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*/
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STATIC INLINE void Chip_ADC_ClearFlags(LPC_ADC_T *pADC, uint32_t flags)
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{
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pADC->FLAGS = flags;
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}
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/**
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* @brief Set Trim register in ADC
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* @param pADC : The base of ADC peripheral on the chip
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* @param trim : Trim value (ADC_TRIM_VRANGE_HIGHV or ADC_TRIM_VRANGE_LOWV)
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* @return None
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*/
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STATIC INLINE void Chip_ADC_SetTrim(LPC_ADC_T *pADC, uint32_t trim)
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{
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pADC->TRM = trim;
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}
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ADC_11U6X_H_ */
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