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/***************************************************************************//**
* @file
* @brief Digital to Analog Converter (DAC) peripheral API
* @author Energy Micro AS
* @version 3.0.0
*******************************************************************************
* @section License
* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.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: 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 __EM_DAC_H
#define __EM_DAC_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdbool.h>
#include "em_part.h"
/***************************************************************************//**
* @addtogroup EM_Library
* @{
******************************************************************************/
/***************************************************************************//**
* @addtogroup DAC
* @{
******************************************************************************/
/** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
/** Validation of DAC register block pointer reference for assert statements. */
#define DAC_REF_VALID(ref) ((ref) == DAC0)
/** @endcond */
/*******************************************************************************
******************************** ENUMS ************************************
******************************************************************************/
/** Conversion mode. */
typedef enum
{
dacConvModeContinuous = _DAC_CTRL_CONVMODE_CONTINUOUS, /**< Continuous mode. */
dacConvModeSampleHold = _DAC_CTRL_CONVMODE_SAMPLEHOLD, /**< Sample/hold mode. */
dacConvModeSampleOff = _DAC_CTRL_CONVMODE_SAMPLEOFF /**< Sample/shut off mode. */
} DAC_ConvMode_TypeDef;
/** Output mode. */
typedef enum
{
dacOutputDisable = _DAC_CTRL_OUTMODE_DISABLE, /**< Output to pin and ADC disabled. */
dacOutputPin = _DAC_CTRL_OUTMODE_PIN, /**< Output to pin only. */
dacOutputADC = _DAC_CTRL_OUTMODE_ADC, /**< Output to ADC only */
dacOutputPinADC = _DAC_CTRL_OUTMODE_PINADC /**< Output to pin and ADC. */
} DAC_Output_TypeDef;
/** Peripheral Reflex System signal used to trigger single sample. */
typedef enum
{
dacPRSSELCh0 = _DAC_CH0CTRL_PRSSEL_PRSCH0, /**< PRS channel 0. */
dacPRSSELCh1 = _DAC_CH0CTRL_PRSSEL_PRSCH1, /**< PRS channel 1. */
dacPRSSELCh2 = _DAC_CH0CTRL_PRSSEL_PRSCH2, /**< PRS channel 2. */
dacPRSSELCh3 = _DAC_CH0CTRL_PRSSEL_PRSCH3, /**< PRS channel 3. */
dacPRSSELCh4 = _DAC_CH0CTRL_PRSSEL_PRSCH4, /**< PRS channel 4. */
dacPRSSELCh5 = _DAC_CH0CTRL_PRSSEL_PRSCH5, /**< PRS channel 5. */
dacPRSSELCh6 = _DAC_CH0CTRL_PRSSEL_PRSCH6, /**< PRS channel 6. */
dacPRSSELCh7 = _DAC_CH0CTRL_PRSSEL_PRSCH7 /**< PRS channel 7. */
} DAC_PRSSEL_TypeDef;
/** Reference voltage for DAC. */
typedef enum
{
dacRef1V25 = _DAC_CTRL_REFSEL_1V25, /**< Internal 1.25V bandgap reference. */
dacRef2V5 = _DAC_CTRL_REFSEL_2V5, /**< Internal 2.5V bandgap reference. */
dacRefVDD = _DAC_CTRL_REFSEL_VDD /**< VDD reference. */
} DAC_Ref_TypeDef;
/** Refresh interval. */
typedef enum
{
dacRefresh8 = _DAC_CTRL_REFRSEL_8CYCLES, /**< Refresh every 8 prescaled cycles. */
dacRefresh16 = _DAC_CTRL_REFRSEL_16CYCLES, /**< Refresh every 16 prescaled cycles. */
dacRefresh32 = _DAC_CTRL_REFRSEL_32CYCLES, /**< Refresh every 32 prescaled cycles. */
dacRefresh64 = _DAC_CTRL_REFRSEL_64CYCLES /**< Refresh every 64 prescaled cycles. */
} DAC_Refresh_TypeDef;
/*******************************************************************************
******************************* STRUCTS ***********************************
******************************************************************************/
/** DAC init structure, common for both channels. */
typedef struct
{
/** Refresh interval. Only used if REFREN bit set for a DAC channel. */
DAC_Refresh_TypeDef refresh;
/** Reference voltage to use. */
DAC_Ref_TypeDef reference;
/** Output mode */
DAC_Output_TypeDef outMode;
/** Conversion mode. */
DAC_ConvMode_TypeDef convMode;
/**
* Prescaler used to get DAC clock. Derived as follows:
* DACclk=HFPERclk/(2^prescale). The DAC clock should be <= 1MHz.
*/
uint8_t prescale;
/** Enable/disable use of low pass filter on output. */
bool lpEnable;
/** Enable/disable reset of prescaler on ch0 start. */
bool ch0ResetPre;
/** Enable/disable output enable control by CH1 PRS signal. */
bool outEnablePRS;
/** Enable/disable sine mode. */
bool sineEnable;
/** Select if single ended or differential mode. */
bool diff;
} DAC_Init_TypeDef;
/** Default config for DAC init structure. */
#define DAC_INIT_DEFAULT \
{ dacRefresh8, /* Refresh every 8 prescaled cycles. */ \
dacRef1V25, /* 1.25V internal reference. */ \
dacOutputPin, /* Output to pin only. */ \
dacConvModeContinuous, /* Continuous mode. */ \
0, /* No prescaling. */ \
false, /* Do not enable low pass filter. */ \
false, /* Do not reset prescaler on ch0 start. */ \
false, /* DAC output enable always on. */ \
false, /* Disable sine mode. */ \
false /* Single ended mode. */ \
}
/** DAC channel init structure. */
typedef struct
{
/** Enable channel. */
bool enable;
/**
* Peripheral reflex system trigger enable. If false, channel is triggered
* by writing to CHnDATA.
*/
bool prsEnable;
/**
* Enable/disable automatic refresh of channel. Refresh interval must be
* defined in common control init, please see DAC_Init().
*/
bool refreshEnable;
/**
* Peripheral reflex system trigger selection. Only applicable if @p prsEnable
* is enabled.
*/
DAC_PRSSEL_TypeDef prsSel;
} DAC_InitChannel_TypeDef;
/** Default config for DAC channel init structure. */
#define DAC_INITCHANNEL_DEFAULT \
{ false, /* Leave channel disabled when init done. */ \
false, /* Disable PRS triggering. */ \
false, /* Channel not refreshed automatically. */ \
dacPRSSELCh0 /* Select PRS ch0 (if PRS triggering enabled). */ \
}
/*******************************************************************************
***************************** PROTOTYPES **********************************
******************************************************************************/
void DAC_Enable(DAC_TypeDef *dac, unsigned int ch, bool enable);
void DAC_Init(DAC_TypeDef *dac, const DAC_Init_TypeDef *init);
void DAC_InitChannel(DAC_TypeDef *dac,
const DAC_InitChannel_TypeDef *init,
unsigned int ch);
/***************************************************************************//**
* @brief
* Clear one or more pending DAC interrupts.
*
* @param[in] dac
* Pointer to DAC peripheral register block.
*
* @param[in] flags
* Pending DAC interrupt source to clear. Use a bitwise logic OR combination of
* valid interrupt flags for the DAC module (DAC_IF_nnn).
******************************************************************************/
__STATIC_INLINE void DAC_IntClear(DAC_TypeDef *dac, uint32_t flags)
{
dac->IFC = flags;
}
/***************************************************************************//**
* @brief
* Disable one or more DAC interrupts.
*
* @param[in] dac
* Pointer to DAC peripheral register block.
*
* @param[in] flags
* DAC interrupt sources to disable. Use a bitwise logic OR combination of
* valid interrupt flags for the DAC module (DAC_IF_nnn).
******************************************************************************/
__STATIC_INLINE void DAC_IntDisable(DAC_TypeDef *dac, uint32_t flags)
{
dac->IEN &= ~(flags);
}
/***************************************************************************//**
* @brief
* Enable one or more DAC interrupts.
*
* @note
* Depending on the use, a pending interrupt may already be set prior to
* enabling the interrupt. Consider using DAC_IntClear() prior to enabling
* if such a pending interrupt should be ignored.
*
* @param[in] dac
* Pointer to DAC peripheral register block.
*
* @param[in] flags
* DAC interrupt sources to enable. Use a bitwise logic OR combination of
* valid interrupt flags for the DAC module (DAC_IF_nnn).
******************************************************************************/
__STATIC_INLINE void DAC_IntEnable(DAC_TypeDef *dac, uint32_t flags)
{
dac->IEN |= flags;
}
/***************************************************************************//**
* @brief
* Get pending DAC interrupt flags.
*
* @note
* The event bits are not cleared by the use of this function.
*
* @param[in] dac
* Pointer to DAC peripheral register block.
*
* @return
* DAC interrupt sources pending. A bitwise logic OR combination of valid
* interrupt flags for the DAC module (DAC_IF_nnn).
******************************************************************************/
__STATIC_INLINE uint32_t DAC_IntGet(DAC_TypeDef *dac)
{
return(dac->IF);
}
/***************************************************************************//**
* @brief
* Set one or more pending DAC interrupts from SW.
*
* @param[in] dac
* Pointer to DAC peripheral register block.
*
* @param[in] flags
* DAC interrupt sources to set to pending. Use a bitwise logic OR combination
* of valid interrupt flags for the DAC module (DAC_IF_nnn).
******************************************************************************/
__STATIC_INLINE void DAC_IntSet(DAC_TypeDef *dac, uint32_t flags)
{
dac->IFS = flags;
}
uint8_t DAC_PrescaleCalc(uint32_t dacFreq, uint32_t hfperFreq);
void DAC_Reset(DAC_TypeDef *dac);
/** @} (end addtogroup DAC) */
/** @} (end addtogroup EM_Library) */
#ifdef __cplusplus
}
#endif
#endif /* __EM_DAC_H */
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