Johannes Stratmann
added prescaler for 16 bit pwm in LPC1347 target
Fork of
mbed-dev
by 
mbed official
Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_opamp.c
- Revision:
- 0:9b334a45a8ff
- Child:
- 50:a417edff4437
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_opamp.c Thu Oct 01 15:25:22 2015 +0300
@@ -0,0 +1,431 @@
+/**************************************************************************//**
+ * @file em_opamp.c
+ * @brief Operational Amplifier (OPAMP) peripheral API
+ * @version 3.20.12
+ ******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2014 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
+ * obligation to support this Software. Silicon Labs 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.
+ *
+ * Silicon Labs 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.
+ *
+ ******************************************************************************/
+
+
+#include "em_device.h"
+#if defined( OPAMP_PRESENT ) && ( OPAMP_COUNT == 1 )
+
+#include "em_system.h"
+#include "em_assert.h"
+#include "em_opamp.h"
+
+/***************************************************************************//**
+ * @addtogroup EM_Library
+ * @{
+ ******************************************************************************/
+
+
+/***************************************************************************//**
+ * @addtogroup OPAMP
+ * @brief Operational Amplifier (OPAMP) peripheral API
+ * @details
+ * This module contains functions to:
+ * @li OPAMP_Enable() Configure and enable an opamp.
+ * @li OPAMP_Disable() Disable an opamp.
+ *
+ * All OPAMP functions assume that the DAC clock is running. If the DAC is not
+ * used, the clock can be turned off when the opamp's are configured.
+ *
+ * If the available gain values dont suit the application at hand, the resistor
+ * ladders can be disabled and external gain programming resistors used.
+ *
+ * A number of predefined opamp setup macros are available for configuration
+ * of the most common opamp topologies (see figures below).
+ *
+ * @note
+ * <em>The terms POSPAD and NEGPAD in the figures are used to indicate that these
+ * pads should be connected to a suitable signal ground.</em>
+ *
+ * \n<b>Unity gain voltage follower.</b>\n
+ * Use predefined macros @ref OPA_INIT_UNITY_GAIN and
+ * @ref OPA_INIT_UNITY_GAIN_OPA2.
+ * @verbatim
+
+ |\
+ ___________|+\
+ | \_______
+ ___|_ / |
+ | | / |
+ | |/ |
+ |___________|
+ @endverbatim
+ *
+ * \n<b>Non-inverting amplifier.</b>\n
+ * Use predefined macros @ref OPA_INIT_NON_INVERTING and
+ * @ref OPA_INIT_NON_INVERTING_OPA2.
+ * @verbatim
+
+ |\
+ ___________|+\
+ | \_______
+ ___|_ / |
+ | | / |
+ | |/ |
+ |_____R2____|
+ |
+ R1
+ |
+ NEGPAD @endverbatim
+ *
+ * \n<b>Inverting amplifier.</b>\n
+ * Use predefined macros @ref OPA_INIT_INVERTING and
+ * @ref OPA_INIT_INVERTING_OPA2.
+ * @verbatim
+
+ _____R2____
+ | |
+ | |\ |
+ ____R1_|___|_\ |
+ | \____|___
+ ___| /
+ | |+/
+ | |/
+ |
+ POSPAD @endverbatim
+ *
+ * \n<b>Cascaded non-inverting amplifiers.</b>\n
+ * Use predefined macros @ref OPA_INIT_CASCADED_NON_INVERTING_OPA0,
+ * @ref OPA_INIT_CASCADED_NON_INVERTING_OPA1 and
+ * @ref OPA_INIT_CASCADED_NON_INVERTING_OPA2.
+ * @verbatim
+
+ |\ |\ |\
+ ___________|+\ OPA0 ___________|+\ OPA1 ___________|+\ OPA2
+ | \_________| | \_________| | \_______
+ ___|_ / | ___|_ / | ___|_ / |
+ | | / | | | / | | | / |
+ | |/ | | |/ | | |/ |
+ |_____R2____| |_____R2____| |_____R2____|
+ | | |
+ R1 R1 R1
+ | | |
+ NEGPAD NEGPAD NEGPAD @endverbatim
+ *
+ * \n<b>Cascaded inverting amplifiers.</b>\n
+ * Use predefined macros @ref OPA_INIT_CASCADED_INVERTING_OPA0,
+ * @ref OPA_INIT_CASCADED_INVERTING_OPA1 and
+ * @ref OPA_INIT_CASCADED_INVERTING_OPA2.
+ * @verbatim
+
+ _____R2____ _____R2____ _____R2____
+ | | | | | |
+ | |\ | | |\ | | |\ |
+ ____R1_|___|_\ | ____R1_|___|_\ | ____R1_|___|_\ |
+ | \____|____| | \____|___| | \____|__
+ ___| / ___| / ___| /
+ | |+/ OPA0 | |+/ OPA1 | |+/ OPA2
+ | |/ | |/ | |/
+ | | |
+ POSPAD POSPAD POSPAD @endverbatim
+ *
+ * \n<b>Differential driver with two opamp's.</b>\n
+ * Use predefined macros @ref OPA_INIT_DIFF_DRIVER_OPA0 and
+ * @ref OPA_INIT_DIFF_DRIVER_OPA1.
+ * @verbatim
+
+ __________________________
+ | +
+ | _____R2____
+ |\ | | |
+ ___________|+\ OPA0 | | |\ OPA1 |
+ | \_________|____R1_|___|_\ | _
+ ___|_ / | | \____|______
+ | | / | ___| /
+ | |/ | | |+/
+ |________________| | |/
+ |
+ POSPAD @endverbatim
+ *
+ * \n<b>Differential receiver with three opamp's.</b>\n
+ * Use predefined macros @ref OPA_INIT_DIFF_RECEIVER_OPA0,
+ * @ref OPA_INIT_DIFF_RECEIVER_OPA1 and @ref OPA_INIT_DIFF_RECEIVER_OPA2.
+ * @verbatim
+
+ |\
+ __________|+\ OPA1
+ _ | \_________
+ ___|_ / | | _____R2____
+ | | / | | | |
+ | |/ | | | |\ |
+ |___________| |____R1_|___|_\ |
+ | \____|___
+ |\ ____R1_ ___| /
+ +__________|+\ OPA0 | | |+/ OPA2
+ | \_________| | |/
+ ___|_ / | R2
+ | | / | |
+ | |/ | NEGPAD OPA0
+ |___________|
+ @endverbatim
+ *
+ * @{
+ ******************************************************************************/
+
+/*******************************************************************************
+ ************************** GLOBAL FUNCTIONS *******************************
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * @brief
+ * Disable an Operational Amplifier.
+ *
+ * @param[in] dac
+ * Pointer to DAC peripheral register block.
+ *
+ * @param[in] opa
+ * Selects an OPA, valid vaules are @ref OPA0, @ref OPA1 and @ref OPA2.
+ ******************************************************************************/
+void OPAMP_Disable( DAC_TypeDef *dac, OPAMP_TypeDef opa )
+{
+ EFM_ASSERT( DAC_REF_VALID( dac ) );
+ EFM_ASSERT( DAC_OPA_VALID( opa ) );
+
+ if ( opa == OPA0 )
+ {
+ dac->CH0CTRL &= ~DAC_CH0CTRL_EN;
+ dac->OPACTRL &= ~DAC_OPACTRL_OPA0EN;
+ }
+ else if ( opa == OPA1 )
+ {
+ dac->CH1CTRL &= ~DAC_CH1CTRL_EN;
+ dac->OPACTRL &= ~DAC_OPACTRL_OPA1EN;
+ }
+ else /* OPA2 */
+ {
+ dac->OPACTRL &= ~DAC_OPACTRL_OPA2EN;
+ }
+}
+
+
+/***************************************************************************//**
+ * @brief
+ * Configure and enable an Operational Amplifier.
+ *
+ * @note
+ * The value of the alternate output enable bit mask in the OPAMP_Init_TypeDef
+ * structure should consist of one or more of the
+ * DAC_OPA[opa#]MUX_OUTPEN_OUT[output#] flags
+ * (defined in \<part_name\>_dac.h) OR'ed together. @n @n
+ * For OPA0:
+ * @li DAC_OPA0MUX_OUTPEN_OUT0
+ * @li DAC_OPA0MUX_OUTPEN_OUT1
+ * @li DAC_OPA0MUX_OUTPEN_OUT2
+ * @li DAC_OPA0MUX_OUTPEN_OUT3
+ * @li DAC_OPA0MUX_OUTPEN_OUT4
+ *
+ * For OPA1:
+ * @li DAC_OPA1MUX_OUTPEN_OUT0
+ * @li DAC_OPA1MUX_OUTPEN_OUT1
+ * @li DAC_OPA1MUX_OUTPEN_OUT2
+ * @li DAC_OPA1MUX_OUTPEN_OUT3
+ * @li DAC_OPA1MUX_OUTPEN_OUT4
+ *
+ * For OPA2:
+ * @li DAC_OPA2MUX_OUTPEN_OUT0
+ * @li DAC_OPA2MUX_OUTPEN_OUT1
+ *
+ * E.g: @n
+ * init.outPen = DAC_OPA0MUX_OUTPEN_OUT0 | DAC_OPA0MUX_OUTPEN_OUT4;
+ *
+ * @param[in] dac
+ * Pointer to DAC peripheral register block.
+ *
+ * @param[in] opa
+ * Selects an OPA, valid vaules are @ref OPA0, @ref OPA1 and @ref OPA2.
+ *
+ * @param[in] init
+ * Pointer to a structure containing OPAMP init information.
+ ******************************************************************************/
+void OPAMP_Enable( DAC_TypeDef *dac, OPAMP_TypeDef opa, const OPAMP_Init_TypeDef *init )
+{
+ uint32_t offset;
+
+ EFM_ASSERT( DAC_REF_VALID( dac ) );
+ EFM_ASSERT( DAC_OPA_VALID( opa ) );
+ EFM_ASSERT( init->bias <= ( _DAC_BIASPROG_BIASPROG_MASK >>
+ _DAC_BIASPROG_BIASPROG_SHIFT ) );
+
+ if ( opa == OPA0 )
+ {
+ EFM_ASSERT( ( init->outPen & ~_DAC_OPA0MUX_OUTPEN_MASK ) == 0 );
+
+ dac->BIASPROG = ( dac->BIASPROG
+ & ~( _DAC_BIASPROG_BIASPROG_MASK |
+ DAC_BIASPROG_HALFBIAS ) ) |
+ ( init->bias << _DAC_BIASPROG_BIASPROG_SHIFT ) |
+ ( init->halfBias ? DAC_BIASPROG_HALFBIAS : 0 );
+
+ if ( init->defaultOffset )
+ {
+ offset = SYSTEM_GetCalibrationValue( &dac->CAL );
+ dac->CAL = ( dac->CAL & ~_DAC_CAL_CH0OFFSET_MASK ) |
+ ( offset & _DAC_CAL_CH0OFFSET_MASK );
+ }
+ else
+ {
+ EFM_ASSERT( init->offset <= ( _DAC_CAL_CH0OFFSET_MASK >>
+ _DAC_CAL_CH0OFFSET_SHIFT ) );
+
+ dac->CAL = ( dac->CAL & ~_DAC_CAL_CH0OFFSET_MASK ) |
+ ( init->offset << _DAC_CAL_CH0OFFSET_SHIFT );
+ }
+
+ dac->OPA0MUX = (uint32_t)init->resSel |
+ (uint32_t)init->outMode |
+ init->outPen |
+ (uint32_t)init->resInMux |
+ (uint32_t)init->negSel |
+ (uint32_t)init->posSel |
+ ( init->nextOut ? DAC_OPA0MUX_NEXTOUT : 0 ) |
+ ( init->npEn ? DAC_OPA0MUX_NPEN : 0 ) |
+ ( init->ppEn ? DAC_OPA0MUX_PPEN : 0 );
+
+ dac->CH0CTRL |= DAC_CH0CTRL_EN;
+ dac->OPACTRL = ( dac->OPACTRL
+ & ~( DAC_OPACTRL_OPA0SHORT |
+ _DAC_OPACTRL_OPA0LPFDIS_MASK |
+ DAC_OPACTRL_OPA0HCMDIS ) ) |
+ ( init->shortInputs ? DAC_OPACTRL_OPA0SHORT : 0 ) |
+ ( init->lpfPosPadDisable ?
+ DAC_OPACTRL_OPA0LPFDIS_PLPFDIS : 0 ) |
+ ( init->lpfNegPadDisable ?
+ DAC_OPACTRL_OPA0LPFDIS_NLPFDIS : 0 ) |
+ ( init->hcmDisable ? DAC_OPACTRL_OPA0HCMDIS : 0 ) |
+ ( DAC_OPACTRL_OPA0EN );
+ }
+ else if ( opa == OPA1 )
+ {
+ EFM_ASSERT( ( init->outPen & ~_DAC_OPA1MUX_OUTPEN_MASK ) == 0 );
+
+ dac->BIASPROG = ( dac->BIASPROG
+ & ~( _DAC_BIASPROG_BIASPROG_MASK |
+ DAC_BIASPROG_HALFBIAS ) ) |
+ ( init->bias << _DAC_BIASPROG_BIASPROG_SHIFT ) |
+ ( init->halfBias ? DAC_BIASPROG_HALFBIAS : 0 );
+
+ if ( init->defaultOffset )
+ {
+ offset = SYSTEM_GetCalibrationValue( &dac->CAL );
+ dac->CAL = ( dac->CAL & ~_DAC_CAL_CH1OFFSET_MASK ) |
+ ( offset & _DAC_CAL_CH1OFFSET_MASK );
+ }
+ else
+ {
+ EFM_ASSERT( init->offset <= ( _DAC_CAL_CH1OFFSET_MASK >>
+ _DAC_CAL_CH1OFFSET_SHIFT ) );
+
+ dac->CAL = ( dac->CAL & ~_DAC_CAL_CH1OFFSET_MASK ) |
+ ( init->offset << _DAC_CAL_CH1OFFSET_SHIFT );
+ }
+
+ dac->OPA1MUX = (uint32_t)init->resSel |
+ (uint32_t)init->outMode |
+ init->outPen |
+ (uint32_t)init->resInMux |
+ (uint32_t)init->negSel |
+ (uint32_t)init->posSel |
+ ( init->nextOut ? DAC_OPA1MUX_NEXTOUT : 0 ) |
+ ( init->npEn ? DAC_OPA1MUX_NPEN : 0 ) |
+ ( init->ppEn ? DAC_OPA1MUX_PPEN : 0 );
+
+ dac->CH1CTRL |= DAC_CH1CTRL_EN;
+ dac->OPACTRL = ( dac->OPACTRL
+ & ~( DAC_OPACTRL_OPA1SHORT |
+ _DAC_OPACTRL_OPA1LPFDIS_MASK |
+ DAC_OPACTRL_OPA1HCMDIS ) ) |
+ ( init->shortInputs ? DAC_OPACTRL_OPA1SHORT : 0 ) |
+ ( init->lpfPosPadDisable ?
+ DAC_OPACTRL_OPA1LPFDIS_PLPFDIS : 0 ) |
+ ( init->lpfNegPadDisable ?
+ DAC_OPACTRL_OPA1LPFDIS_NLPFDIS : 0 ) |
+ ( init->hcmDisable ? DAC_OPACTRL_OPA1HCMDIS : 0 ) |
+ ( DAC_OPACTRL_OPA1EN );
+ }
+ else /* OPA2 */
+ {
+ EFM_ASSERT( ( init->posSel == DAC_OPA2MUX_POSSEL_DISABLE ) ||
+ ( init->posSel == DAC_OPA2MUX_POSSEL_POSPAD ) ||
+ ( init->posSel == DAC_OPA2MUX_POSSEL_OPA1INP ) ||
+ ( init->posSel == DAC_OPA2MUX_POSSEL_OPATAP ) );
+
+ EFM_ASSERT( ( init->outMode & ~DAC_OPA2MUX_OUTMODE ) == 0 );
+
+ EFM_ASSERT( ( init->outPen & ~_DAC_OPA2MUX_OUTPEN_MASK ) == 0 );
+
+ dac->BIASPROG = ( dac->BIASPROG
+ & ~( _DAC_BIASPROG_OPA2BIASPROG_MASK |
+ DAC_BIASPROG_OPA2HALFBIAS ) ) |
+ ( init->bias << _DAC_BIASPROG_OPA2BIASPROG_SHIFT ) |
+ ( init->halfBias ? DAC_BIASPROG_OPA2HALFBIAS : 0 );
+
+ if ( init->defaultOffset )
+ {
+ offset = SYSTEM_GetCalibrationValue( &dac->OPAOFFSET );
+ dac->OPAOFFSET = ( dac->OPAOFFSET & ~_DAC_OPAOFFSET_OPA2OFFSET_MASK ) |
+ ( offset & _DAC_OPAOFFSET_OPA2OFFSET_MASK );
+ }
+ else
+ {
+ EFM_ASSERT( init->offset <= ( _DAC_OPAOFFSET_OPA2OFFSET_MASK >>
+ _DAC_OPAOFFSET_OPA2OFFSET_SHIFT ) );
+ dac->OPAOFFSET = ( dac->OPAOFFSET & ~_DAC_OPAOFFSET_OPA2OFFSET_MASK ) |
+ ( init->offset << _DAC_OPAOFFSET_OPA2OFFSET_SHIFT );
+ }
+
+ dac->OPA2MUX = (uint32_t)init->resSel |
+ (uint32_t)init->outMode |
+ init->outPen |
+ (uint32_t)init->resInMux |
+ (uint32_t)init->negSel |
+ (uint32_t)init->posSel |
+ ( init->nextOut ? DAC_OPA2MUX_NEXTOUT : 0 ) |
+ ( init->npEn ? DAC_OPA2MUX_NPEN : 0 ) |
+ ( init->ppEn ? DAC_OPA2MUX_PPEN : 0 );
+
+ dac->OPACTRL = ( dac->OPACTRL
+ & ~( DAC_OPACTRL_OPA2SHORT |
+ _DAC_OPACTRL_OPA2LPFDIS_MASK |
+ DAC_OPACTRL_OPA2HCMDIS ) ) |
+ ( init->shortInputs ? DAC_OPACTRL_OPA2SHORT : 0 ) |
+ ( init->lpfPosPadDisable ?
+ DAC_OPACTRL_OPA2LPFDIS_PLPFDIS : 0 ) |
+ ( init->lpfNegPadDisable ?
+ DAC_OPACTRL_OPA2LPFDIS_NLPFDIS : 0 ) |
+ ( init->hcmDisable ? DAC_OPACTRL_OPA2HCMDIS : 0 ) |
+ ( DAC_OPACTRL_OPA2EN );
+ }
+}
+
+/** @} (end addtogroup OPAMP) */
+/** @} (end addtogroup EM_Library) */
+
+#endif /* defined( OPAMP_PRESENT ) && ( OPAMP_COUNT == 1 ) */