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- /**************************************************************************//**
- * @file
- * @brief Operational Amplifier (OPAMP) peripheral API for EFM32.
- * @author Energy Micro AS
- * @version 2.0.0
- ******************************************************************************
- * @section License
- * <b>(C) Copyright 2011 Energy Micro AS, http://www.energymicro.com</b>
- ******************************************************************************
- *
- * This source code is the property of Energy Micro AS. The source and compiled
- * code may only be used on Energy Micro "EFM32" microcontrollers.
- *
- * This copyright notice may not be removed from the source code nor changed.
- *
- * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
- * obligation to support this Software. Energy Micro AS is providing the
- * Software "AS IS", with no express or implied warranties of any kind,
- * including, but not limited to, any implied warranties of merchantability
- * or fitness for any particular purpose or warranties against infringement
- * of any proprietary rights of a third party.
- *
- * Energy Micro AS will not be liable for any consequential, incidental, or
- * special damages, or any other relief, or for any claim by any third party,
- * arising from your use of this Software.
- *
- *****************************************************************************/
- #ifndef __EFM32_OPAMP_H
- #define __EFM32_OPAMP_H
- #include "efm32.h"
- #if defined(OPAMP_PRESENT) && (OPAMP_COUNT == 1)
- #ifdef __cplusplus
- extern "C" {
- #endif
- #include <stdint.h>
- #include <stdbool.h>
- #include "efm32_dac.h"
- /***************************************************************************//**
- * @addtogroup EFM32_Library
- * @{
- ******************************************************************************/
- /***************************************************************************//**
- * @addtogroup OPAMP
- * @{
- ******************************************************************************/
- /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
- /** Validation of DAC OPA number for assert statements. */
- #define DAC_OPA_VALID(opa) ((opa) <= OPA2)
- /** @endcond */
- /*******************************************************************************
- ******************************** ENUMS ************************************
- ******************************************************************************/
- /** OPAMP selector values. */
- typedef enum
- {
- OPA0 = 0, /**< Select OPA0. */
- OPA1 = 1, /**< Select OPA1. */
- OPA2 = 2 /**< Select OPA2. */
- } OPAMP_TypeDef;
- /** OPAMP negative terminal input selection values. */
- typedef enum
- {
- opaNegSelDisable = DAC_OPA0MUX_NEGSEL_DISABLE, /**< Input disabled. */
- opaNegSelUnityGain = DAC_OPA0MUX_NEGSEL_UG, /**< Unity gain feedback path. */
- opaNegSelResTap = DAC_OPA0MUX_NEGSEL_OPATAP, /**< Feedback resistor ladder tap. */
- opaNegSelNegPad = DAC_OPA0MUX_NEGSEL_NEGPAD /**< Negative pad as input. */
- } OPAMP_NegSel_TypeDef;
- /** OPAMP positive terminal input selection values. */
- typedef enum
- {
- opaPosSelDisable = DAC_OPA0MUX_POSSEL_DISABLE, /**< Input disabled. */
- opaPosSelDac = DAC_OPA0MUX_POSSEL_DAC, /**< DAC as input (not OPA2). */
- opaPosSelPosPad = DAC_OPA0MUX_POSSEL_POSPAD, /**< Positive pad as input. */
- opaPosSelOpaIn = DAC_OPA0MUX_POSSEL_OPA1IN, /**< Input from OPAx. */
- opaPosSelResTapOpa0 = DAC_OPA0MUX_POSSEL_OPATAP /**< Feedback resistor ladder tap from OPA0. */
- } OPAMP_PosSel_TypeDef;
- /** OPAMP output terminal selection values. */
- typedef enum
- {
- opaOutModeDisable = DAC_OPA0MUX_OUTMODE_DISABLE, /**< OPA output disabled. */
- opaOutModeMain = DAC_OPA0MUX_OUTMODE_MAIN, /**< Main output to pin enabled. */
- opaOutModeAlt = DAC_OPA0MUX_OUTMODE_ALT, /**< Alternate output(s) enabled (not OPA2). */
- opaOutModeAll = DAC_OPA0MUX_OUTMODE_ALL /**< Both main and alternate enabled (not OPA2). */
- } OPAMP_OutMode_TypeDef;
- /** OPAMP gain values. */
- typedef enum
- {
- opaResSelDefault = DAC_OPA0MUX_RESSEL_DEFAULT, /**< Default value when resistor ladder is unused. */
- opaResSelR2eq0_33R1 = DAC_OPA0MUX_RESSEL_RES0, /**< R2 = 0.33 * R1 */
- opaResSelR2eqR1 = DAC_OPA0MUX_RESSEL_RES1, /**< R2 = R1 */
- opaResSelR1eq1_67R1 = DAC_OPA0MUX_RESSEL_RES2, /**< R2 = 1.67 R1 */
- opaResSelR2eq2R1 = DAC_OPA0MUX_RESSEL_RES3, /**< R2 = 2 * R1 */
- opaResSelR2eq3R1 = DAC_OPA0MUX_RESSEL_RES4, /**< R2 = 3 * R1 */
- opaResSelR2eq4_33R1 = DAC_OPA0MUX_RESSEL_RES5, /**< R2 = 4.33 * R1 */
- opaResSelR2eq7R1 = DAC_OPA0MUX_RESSEL_RES6, /**< R2 = 7 * R1 */
- opaResSelR2eq15R1 = DAC_OPA0MUX_RESSEL_RES7 /**< R2 = 15 * R1 */
- } OPAMP_ResSel_TypeDef;
- /** OPAMP resistor ladder input selector values. */
- typedef enum
- {
- opaResInMuxDisable = DAC_OPA0MUX_RESINMUX_DISABLE, /**< Resistor ladder disabled. */
- opaResInMuxOpaIn = DAC_OPA0MUX_RESINMUX_OPA2INP, /**< Input from OPAx. */
- opaResInMuxNegPad = DAC_OPA0MUX_RESINMUX_NEGPAD, /**< Input from negative pad. */
- opaResInMuxPosPad = DAC_OPA0MUX_RESINMUX_POSPAD, /**< Input from positive pad. */
- opaResInMuxVss = DAC_OPA0MUX_RESINMUX_VSS /**< Input connected to Vss. */
- } OPAMP_ResInMux_TypeDef;
- /*******************************************************************************
- ******************************* STRUCTS ***********************************
- ******************************************************************************/
- /** OPAMP init structure. */
- typedef struct
- {
- OPAMP_NegSel_TypeDef negSel; /**< Select input source for negative terminal. */
- OPAMP_PosSel_TypeDef posSel; /**< Select input source for positive terminal. */
- OPAMP_OutMode_TypeDef outMode; /**< Output terminal connection. */
- OPAMP_ResSel_TypeDef resSel; /**< Select R2/R1 resistor ratio. */
- OPAMP_ResInMux_TypeDef resInMux; /**< Select input source for resistor ladder. */
- uint32_t outPen; /**< Select alternate output terminal connections. */
- uint32_t bias; /**< Set OPAMP bias current. */
- bool halfBias; /**< Divide OPAMP bias current by 2. */
- bool lpfPosPadDisable; /**< Disable low pass filter on positive pad. */
- bool lpfNegPadDisable; /**< Disable low pass filter on negative pad. */
- bool nextOut; /**< Enable NEXTOUT signal source. */
- bool npEn; /**< Enable positive pad. */
- bool ppEn; /**< Enable negative pad. */
- bool shortInputs; /**< Short OPAMP input terminals. */
- bool hcmDisable; /**< Disable input rail-to-rail capability. */
- bool defaultOffset; /**< Use factory calibrated opamp offset value. */
- uint32_t offset; /**< Opamp offset value when @ref defaultOffset is false.*/
- } OPAMP_Init_TypeDef;
- /** Configuration of OPA0/1 in unity gain voltage follower mode. */
- #define OPA_INIT_UNITY_GAIN \
- { \
- opaNegSelUnityGain, /* Unity gain. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeMain, /* Main output enabled. */ \
- opaResSelDefault, /* Resistor ladder is not used. */ \
- opaResInMuxDisable, /* Resistor ladder disabled. */ \
- 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 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 unity gain voltage follower mode. */
- #define OPA_INIT_UNITY_GAIN_OPA2 \
- { \
- opaNegSelUnityGain, /* Unity gain. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeMain, /* Main output enabled. */ \
- opaResSelDefault, /* Resistor ladder is not used. */ \
- opaResInMuxDisable, /* Resistor ladder disabled. */ \
- DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 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 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 OPA0/1 in non-inverting amplifier mode. */
- #define OPA_INIT_NON_INVERTING \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeMain, /* Main output enabled. */ \
- opaResSelR2eq0_33R1, /* R2 = 1/3 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. */ \
- false, /* No nextout output enabled. */ \
- 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 OPA2 in non-inverting amplifier mode. */
- #define OPA_INIT_NON_INVERTING_OPA2 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeMain, /* Main output enabled. */ \
- opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
- opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
- DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 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. */ \
- 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 OPA0/1 in inverting amplifier mode. */
- #define OPA_INIT_INVERTING \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeMain, /* Main output enabled. */ \
- 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. */ \
- false, /* No nextout output enabled. */ \
- true, /* Neg pad enabled, used as signal input. */ \
- 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 OPA2 in inverting amplifier mode. */
- #define OPA_INIT_INVERTING_OPA2 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeMain, /* Main output enabled. */ \
- opaResSelR2eqR1, /* R2 = R1 */ \
- opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
- DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 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. */ \
- true, /* Neg pad enabled, used as signal input. */ \
- 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 cascaded non-inverting amplifier mode. */
- #define OPA_INIT_CASCADED_NON_INVERTING_OPA0 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeAll, /* Both main and alternate outputs. */ \
- opaResSelR2eq0_33R1, /* R2 = 1/3 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 (OPA1). */ \
- 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 cascaded non-inverting amplifier mode. */
- #define OPA_INIT_CASCADED_NON_INVERTING_OPA1 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelOpaIn, /* Pos input from OPA0 output. */ \
- opaOutModeAll, /* Both main and alternate outputs. */ \
- opaResSelR2eq0_33R1, /* R2 = 1/3 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. */ \
- 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). */ \
- }
- /** Configuration of OPA2 in cascaded non-inverting amplifier mode. */
- #define OPA_INIT_CASCADED_NON_INVERTING_OPA2 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelOpaIn, /* Pos input from OPA1 output. */ \
- opaOutModeMain, /* Main output enabled. */ \
- opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
- opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
- DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 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. */ \
- true, /* Neg pad enabled, used as signal ground. */ \
- 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). */ \
- }
- /** Configuration of OPA0 in cascaded inverting amplifier mode. */
- #define OPA_INIT_CASCADED_INVERTING_OPA0 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- 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 (OPA1). */ \
- true, /* Neg pad enabled, used as signal input. */ \
- 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 OPA1 in cascaded inverting amplifier mode. */
- #define OPA_INIT_CASCADED_INVERTING_OPA1 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeAll, /* Both main and alternate outputs. */ \
- 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. */ \
- true, /* Pass output to next stage (OPA2). */ \
- 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 OPA2 in cascaded inverting amplifier mode. */
- #define OPA_INIT_CASCADED_INVERTING_OPA2 \
- { \
- opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeMain, /* Main output enabled. */ \
- opaResSelR2eqR1, /* R2 = R1 */ \
- opaResInMuxOpaIn, /* Resistor ladder input from OPA1. */ \
- DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 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 two-opamp differential driver mode. */
- #define OPA_INIT_DIFF_DRIVER_OPA0 \
- { \
- opaNegSelUnityGain, /* Unity gain. */ \
- opaPosSelPosPad, /* Pos input from pad. */ \
- opaOutModeAll, /* Both main and alternate outputs. */ \
- opaResSelDefault, /* Resistor ladder is not used. */ \
- opaResInMuxDisable, /* Resistor ladder disabled. */ \
- 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 (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 \
- { \
- 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, 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 */
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