/**************************************************************************//** * @file * @brief Operational Amplifier (OPAMP) peripheral API for EFM32. * @author Energy Micro AS * @version 2.3.2 ****************************************************************************** * @section License * (C) Copyright 2011 Energy Micro AS, http://www.energymicro.com ****************************************************************************** * * 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 #include #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_OPA0INP, /**< 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_OPA0INP, /**< 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, 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 */