539 lines
36 KiB
C
539 lines
36 KiB
C
/**************************************************************************//**
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* @file
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* @brief Operational Amplifier (OPAMP) peripheral API for EFM32.
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* @author Energy Micro AS
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* @version 2.3.2
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******************************************************************************
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* @section License
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* <b>(C) Copyright 2011 Energy Micro AS, http://www.energymicro.com</b>
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******************************************************************************
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*
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* This source code is the property of Energy Micro AS. The source and compiled
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* code may only be used on Energy Micro "EFM32" microcontrollers.
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*
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* This copyright notice may not be removed from the source code nor changed.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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*****************************************************************************/
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#ifndef __EFM32_OPAMP_H
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#define __EFM32_OPAMP_H
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#include "efm32.h"
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#if defined(OPAMP_PRESENT) && (OPAMP_COUNT == 1)
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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#include "efm32_dac.h"
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/***************************************************************************//**
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* @addtogroup EFM32_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup OPAMP
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* @{
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******************************************************************************/
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/** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
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/** Validation of DAC OPA number for assert statements. */
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#define DAC_OPA_VALID(opa) ((opa) <= OPA2)
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/** @endcond */
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/*******************************************************************************
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******************************** ENUMS ************************************
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******************************************************************************/
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/** OPAMP selector values. */
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typedef enum
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{
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OPA0 = 0, /**< Select OPA0. */
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OPA1 = 1, /**< Select OPA1. */
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OPA2 = 2 /**< Select OPA2. */
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} OPAMP_TypeDef;
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/** OPAMP negative terminal input selection values. */
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typedef enum
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{
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opaNegSelDisable = DAC_OPA0MUX_NEGSEL_DISABLE, /**< Input disabled. */
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opaNegSelUnityGain = DAC_OPA0MUX_NEGSEL_UG, /**< Unity gain feedback path. */
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opaNegSelResTap = DAC_OPA0MUX_NEGSEL_OPATAP, /**< Feedback resistor ladder tap. */
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opaNegSelNegPad = DAC_OPA0MUX_NEGSEL_NEGPAD /**< Negative pad as input. */
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} OPAMP_NegSel_TypeDef;
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/** OPAMP positive terminal input selection values. */
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typedef enum
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{
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opaPosSelDisable = DAC_OPA0MUX_POSSEL_DISABLE, /**< Input disabled. */
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opaPosSelDac = DAC_OPA0MUX_POSSEL_DAC, /**< DAC as input (not OPA2). */
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opaPosSelPosPad = DAC_OPA0MUX_POSSEL_POSPAD, /**< Positive pad as input. */
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opaPosSelOpaIn = DAC_OPA0MUX_POSSEL_OPA0INP, /**< Input from OPAx. */
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opaPosSelResTapOpa0 = DAC_OPA0MUX_POSSEL_OPATAP /**< Feedback resistor ladder tap from OPA0. */
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} OPAMP_PosSel_TypeDef;
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/** OPAMP output terminal selection values. */
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typedef enum
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{
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opaOutModeDisable = DAC_OPA0MUX_OUTMODE_DISABLE, /**< OPA output disabled. */
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opaOutModeMain = DAC_OPA0MUX_OUTMODE_MAIN, /**< Main output to pin enabled. */
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opaOutModeAlt = DAC_OPA0MUX_OUTMODE_ALT, /**< Alternate output(s) enabled (not OPA2). */
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opaOutModeAll = DAC_OPA0MUX_OUTMODE_ALL /**< Both main and alternate enabled (not OPA2). */
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} OPAMP_OutMode_TypeDef;
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/** OPAMP gain values. */
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typedef enum
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{
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opaResSelDefault = DAC_OPA0MUX_RESSEL_DEFAULT, /**< Default value when resistor ladder is unused. */
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opaResSelR2eq0_33R1 = DAC_OPA0MUX_RESSEL_RES0, /**< R2 = 0.33 * R1 */
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opaResSelR2eqR1 = DAC_OPA0MUX_RESSEL_RES1, /**< R2 = R1 */
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opaResSelR1eq1_67R1 = DAC_OPA0MUX_RESSEL_RES2, /**< R2 = 1.67 R1 */
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opaResSelR2eq2R1 = DAC_OPA0MUX_RESSEL_RES3, /**< R2 = 2 * R1 */
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opaResSelR2eq3R1 = DAC_OPA0MUX_RESSEL_RES4, /**< R2 = 3 * R1 */
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opaResSelR2eq4_33R1 = DAC_OPA0MUX_RESSEL_RES5, /**< R2 = 4.33 * R1 */
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opaResSelR2eq7R1 = DAC_OPA0MUX_RESSEL_RES6, /**< R2 = 7 * R1 */
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opaResSelR2eq15R1 = DAC_OPA0MUX_RESSEL_RES7 /**< R2 = 15 * R1 */
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} OPAMP_ResSel_TypeDef;
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/** OPAMP resistor ladder input selector values. */
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typedef enum
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{
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opaResInMuxDisable = DAC_OPA0MUX_RESINMUX_DISABLE, /**< Resistor ladder disabled. */
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opaResInMuxOpaIn = DAC_OPA0MUX_RESINMUX_OPA0INP, /**< Input from OPAx. */
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opaResInMuxNegPad = DAC_OPA0MUX_RESINMUX_NEGPAD, /**< Input from negative pad. */
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opaResInMuxPosPad = DAC_OPA0MUX_RESINMUX_POSPAD, /**< Input from positive pad. */
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opaResInMuxVss = DAC_OPA0MUX_RESINMUX_VSS /**< Input connected to Vss. */
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} OPAMP_ResInMux_TypeDef;
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/*******************************************************************************
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******************************* STRUCTS ***********************************
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******************************************************************************/
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/** OPAMP init structure. */
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typedef struct
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{
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OPAMP_NegSel_TypeDef negSel; /**< Select input source for negative terminal. */
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OPAMP_PosSel_TypeDef posSel; /**< Select input source for positive terminal. */
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OPAMP_OutMode_TypeDef outMode; /**< Output terminal connection. */
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OPAMP_ResSel_TypeDef resSel; /**< Select R2/R1 resistor ratio. */
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OPAMP_ResInMux_TypeDef resInMux; /**< Select input source for resistor ladder. */
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uint32_t outPen; /**< Select alternate output terminal connections. */
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uint32_t bias; /**< Set OPAMP bias current. */
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bool halfBias; /**< Divide OPAMP bias current by 2. */
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bool lpfPosPadDisable; /**< Disable low pass filter on positive pad. */
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bool lpfNegPadDisable; /**< Disable low pass filter on negative pad. */
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bool nextOut; /**< Enable NEXTOUT signal source. */
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bool npEn; /**< Enable positive pad. */
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bool ppEn; /**< Enable negative pad. */
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bool shortInputs; /**< Short OPAMP input terminals. */
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bool hcmDisable; /**< Disable input rail-to-rail capability. */
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bool defaultOffset; /**< Use factory calibrated opamp offset value. */
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uint32_t offset; /**< Opamp offset value when @ref defaultOffset is false.*/
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} OPAMP_Init_TypeDef;
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/** Configuration of OPA0/1 in unity gain voltage follower mode. */
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#define OPA_INIT_UNITY_GAIN \
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{ \
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opaNegSelUnityGain, /* Unity gain. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelDefault, /* Resistor ladder is not used. */ \
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opaResInMuxDisable, /* Resistor ladder disabled. */ \
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0, /* No alternate outputs enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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false, /* No nextout output enabled. */ \
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false, /* Neg pad disabled. */ \
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true, /* Pos pad enabled, used as signal input. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA2 in unity gain voltage follower mode. */
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#define OPA_INIT_UNITY_GAIN_OPA2 \
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{ \
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opaNegSelUnityGain, /* Unity gain. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelDefault, /* Resistor ladder is not used. */ \
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opaResInMuxDisable, /* Resistor ladder disabled. */ \
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DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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false, /* No nextout output enabled. */ \
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false, /* Neg pad disabled. */ \
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true, /* Pos pad enabled, used as signal input. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA0/1 in non-inverting amplifier mode. */
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#define OPA_INIT_NON_INVERTING \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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0, /* No alternate outputs enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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false, /* No nextout output enabled. */ \
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true, /* Neg pad enabled, used as signal ground. */ \
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true, /* Pos pad enabled, used as signal input. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA2 in non-inverting amplifier mode. */
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#define OPA_INIT_NON_INVERTING_OPA2 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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false, /* No nextout output enabled. */ \
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true, /* Neg pad enabled, used as signal ground. */ \
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true, /* Pos pad enabled, used as signal input. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA0/1 in inverting amplifier mode. */
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#define OPA_INIT_INVERTING \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelR2eqR1, /* R2 = R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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0, /* No alternate outputs enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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false, /* No nextout output enabled. */ \
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true, /* Neg pad enabled, used as signal input. */ \
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true, /* Pos pad enabled, used as signal ground. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA2 in inverting amplifier mode. */
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#define OPA_INIT_INVERTING_OPA2 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelR2eqR1, /* R2 = R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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false, /* No nextout output enabled. */ \
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true, /* Neg pad enabled, used as signal input. */ \
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true, /* Pos pad enabled, used as signal ground. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA0 in cascaded non-inverting amplifier mode. */
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#define OPA_INIT_CASCADED_NON_INVERTING_OPA0 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeAll, /* Both main and alternate outputs. */ \
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opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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0, /* No alternate outputs enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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true, /* Pass output to next stage (OPA1). */ \
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true, /* Neg pad enabled, used as signal ground. */ \
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true, /* Pos pad enabled, used as signal input. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA1 in cascaded non-inverting amplifier mode. */
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#define OPA_INIT_CASCADED_NON_INVERTING_OPA1 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelOpaIn, /* Pos input from OPA0 output. */ \
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opaOutModeAll, /* Both main and alternate outputs. */ \
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opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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0, /* No alternate outputs enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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true, /* Pass output to next stage (OPA2). */ \
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true, /* Neg pad enabled, used as signal ground. */ \
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false, /* Pos pad disabled. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA2 in cascaded non-inverting amplifier mode. */
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#define OPA_INIT_CASCADED_NON_INVERTING_OPA2 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelOpaIn, /* Pos input from OPA1 output. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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false, /* No nextout output enabled. */ \
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true, /* Neg pad enabled, used as signal ground. */ \
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false, /* Pos pad disabled. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA0 in cascaded inverting amplifier mode. */
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#define OPA_INIT_CASCADED_INVERTING_OPA0 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeAll, /* Both main and alternate outputs. */ \
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opaResSelR2eqR1, /* R2 = R1 */ \
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opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
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0, /* No alternate outputs enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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true, /* Pass output to next stage (OPA1). */ \
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true, /* Neg pad enabled, used as signal input. */ \
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true, /* Pos pad enabled, used as signal ground. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA1 in cascaded inverting amplifier mode. */
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#define OPA_INIT_CASCADED_INVERTING_OPA1 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeAll, /* Both main and alternate outputs. */ \
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opaResSelR2eqR1, /* R2 = R1 */ \
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opaResInMuxOpaIn, /* Resistor ladder input from OPA0. */ \
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0, /* No alternate outputs enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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false, /* No low pass filter on neg pad. */ \
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true, /* Pass output to next stage (OPA2). */ \
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false, /* Neg pad disabled. */ \
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true, /* Pos pad enabled, used as signal ground. */ \
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false, /* No shorting of inputs. */ \
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false, /* Rail-to-rail input enabled. */ \
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true, /* Use factory calibrated opamp offset. */ \
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0 /* Opamp offset value (not used). */ \
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}
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/** Configuration of OPA2 in cascaded inverting amplifier mode. */
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#define OPA_INIT_CASCADED_INVERTING_OPA2 \
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{ \
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opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeMain, /* Main output enabled. */ \
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opaResSelR2eqR1, /* R2 = R1 */ \
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opaResInMuxOpaIn, /* Resistor ladder input from OPA1. */ \
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DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
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_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
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_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
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false, /* No low pass filter on pos pad. */ \
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|
false, /* No low pass filter on neg pad. */ \
|
|
false, /* No nextout output enabled. */ \
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|
false, /* Neg pad disabled. */ \
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|
true, /* Pos pad enabled, used as signal ground. */ \
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|
false, /* No shorting of inputs. */ \
|
|
false, /* Rail-to-rail input enabled. */ \
|
|
true, /* Use factory calibrated opamp offset. */ \
|
|
0 /* Opamp offset value (not used). */ \
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}
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|
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/** Configuration of OPA0 in two-opamp differential driver mode. */
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#define OPA_INIT_DIFF_DRIVER_OPA0 \
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{ \
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opaNegSelUnityGain, /* Unity gain. */ \
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opaPosSelPosPad, /* Pos input from pad. */ \
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opaOutModeAll, /* Both main and alternate outputs. */ \
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|
opaResSelDefault, /* Resistor ladder is not used. */ \
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opaResInMuxDisable, /* Resistor ladder disabled. */ \
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|
0, /* No alternate outputs enabled. */ \
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|
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
|
|
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
|
|
false, /* No low pass filter on pos pad. */ \
|
|
false, /* No low pass filter on neg pad. */ \
|
|
true, /* Pass output to next stage (OPA1). */ \
|
|
false, /* Neg pad disabled. */ \
|
|
true, /* Pos pad enabled, used as signal input. */ \
|
|
false, /* No shorting of inputs. */ \
|
|
false, /* Rail-to-rail input enabled. */ \
|
|
true, /* Use factory calibrated opamp offset. */ \
|
|
0 /* Opamp offset value (not used). */ \
|
|
}
|
|
|
|
/** Configuration of OPA1 in two-opamp differential driver mode. */
|
|
#define OPA_INIT_DIFF_DRIVER_OPA1 \
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|
{ \
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|
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
|
|
opaPosSelPosPad, /* Pos input from pad. */ \
|
|
opaOutModeMain, /* Main output enabled. */ \
|
|
opaResSelR2eqR1, /* R2 = R1 */ \
|
|
opaResInMuxOpaIn, /* Resistor ladder input from OPA0. */ \
|
|
0, /* No alternate outputs enabled. */ \
|
|
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
|
|
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
|
|
false, /* No low pass filter on pos pad. */ \
|
|
false, /* No low pass filter on neg pad. */ \
|
|
false, /* No nextout output enabled. */ \
|
|
false, /* Neg pad disabled. */ \
|
|
true, /* Pos pad enabled, used as signal ground. */ \
|
|
false, /* No shorting of inputs. */ \
|
|
false, /* Rail-to-rail input enabled. */ \
|
|
true, /* Use factory calibrated opamp offset. */ \
|
|
0 /* Opamp offset value (not used). */ \
|
|
}
|
|
|
|
/** Configuration of OPA0 in three-opamp differential receiver mode. */
|
|
#define OPA_INIT_DIFF_RECEIVER_OPA0 \
|
|
{ \
|
|
opaNegSelUnityGain, /* Unity gain. */ \
|
|
opaPosSelPosPad, /* Pos input from pad. */ \
|
|
opaOutModeAll, /* Both main and alternate outputs. */ \
|
|
opaResSelR2eqR1, /* R2 = R1 */ \
|
|
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
|
|
0, /* No alternate outputs enabled. */ \
|
|
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
|
|
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
|
|
false, /* No low pass filter on pos pad. */ \
|
|
false, /* No low pass filter on neg pad. */ \
|
|
true, /* Pass output to next stage (OPA2). */ \
|
|
true, /* Neg pad enabled, used as signal ground. */ \
|
|
true, /* Pos pad enabled, used as signal input. */ \
|
|
false, /* No shorting of inputs. */ \
|
|
false, /* Rail-to-rail input enabled. */ \
|
|
true, /* Use factory calibrated opamp offset. */ \
|
|
0 /* Opamp offset value (not used). */ \
|
|
}
|
|
|
|
/** Configuration of OPA1 in three-opamp differential receiver mode. */
|
|
#define OPA_INIT_DIFF_RECEIVER_OPA1 \
|
|
{ \
|
|
opaNegSelUnityGain, /* Unity gain. */ \
|
|
opaPosSelPosPad, /* Pos input from pad. */ \
|
|
opaOutModeAll, /* Both main and alternate outputs. */ \
|
|
opaResSelDefault, /* Resistor ladder is not used. */ \
|
|
opaResInMuxDisable, /* Disable resistor ladder. */ \
|
|
0, /* No alternate outputs enabled. */ \
|
|
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
|
|
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
|
|
false, /* No low pass filter on pos pad. */ \
|
|
false, /* No low pass filter on neg pad. */ \
|
|
true, /* Pass output to next stage (OPA2). */ \
|
|
false, /* Neg pad disabled. */ \
|
|
true, /* Pos pad enabled, used as signal input. */ \
|
|
false, /* No shorting of inputs. */ \
|
|
false, /* Rail-to-rail input enabled. */ \
|
|
true, /* Use factory calibrated opamp offset. */ \
|
|
0 /* Opamp offset value (not used). */ \
|
|
}
|
|
|
|
/** Configuration of OPA2 in three-opamp differential receiver mode. */
|
|
#define OPA_INIT_DIFF_RECEIVER_OPA2 \
|
|
{ \
|
|
opaNegSelResTap, /* Input from resistor ladder tap. */ \
|
|
opaPosSelResTapOpa0, /* Input from OPA0 resistor ladder tap. */ \
|
|
opaOutModeMain, /* Main output enabled. */ \
|
|
opaResSelR2eqR1, /* R2 = R1 */ \
|
|
opaResInMuxOpaIn, /* Resistor ladder input from OPA1. */ \
|
|
DAC_OPA0MUX_OUTPEN_OUT0, /* Enable alternate output 0. */ \
|
|
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
|
|
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
|
|
false, /* No low pass filter on pos pad. */ \
|
|
false, /* No low pass filter on neg pad. */ \
|
|
false, /* No nextout output enabled. */ \
|
|
false, /* Neg pad disabled. */ \
|
|
false, /* Pos pad disabled. */ \
|
|
false, /* No shorting of inputs. */ \
|
|
false, /* Rail-to-rail input enabled. */ \
|
|
true, /* Use factory calibrated opamp offset. */ \
|
|
0 /* Opamp offset value (not used). */ \
|
|
}
|
|
|
|
/*******************************************************************************
|
|
***************************** PROTOTYPES **********************************
|
|
******************************************************************************/
|
|
|
|
void OPAMP_Disable(DAC_TypeDef *dac, OPAMP_TypeDef opa);
|
|
void OPAMP_Enable(DAC_TypeDef *dac, OPAMP_TypeDef opa, const OPAMP_Init_TypeDef *init);
|
|
|
|
/** @} (end addtogroup OPAMP) */
|
|
/** @} (end addtogroup EFM32_Library) */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* defined( OPAMP_PRESENT ) && ( OPAMP_COUNT == 1 ) */
|
|
#endif /* __EFM32_DAC_H */
|