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drivers/dac: reworked DAC driver interface
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Hauke Petersen
parent
5f88fee132
commit
40ae604c3b
@ -1,5 +1,6 @@
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/*
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* Copyright (C) 2014 Simon Brummer
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* 2015-2016 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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@ -9,144 +10,116 @@
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/**
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* @defgroup drivers_periph_dac DAC
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* @ingroup drivers_periph
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* @brief Low-level DAC peripheral driver
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* @brief DAC peripheral driver interface
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*
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* Similar to the ADC driver interface (@ref drivers_periph_adc), the DAC
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* interface uses the concept of lines, corresponds to a tuple of a DAC device
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* and a DAC output channel.
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*
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* The DAC interface expects data to be served as a 16-bit unsigned integer,
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* independent of the actual resolution of the hardware device. It is up to the
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* DAC driver, to scale the given value to the maximal width that can be
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* handled. The device driver should, on the other hand, implement the DAC in a
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* way, that it will use the bit width, that comes closest to 16-bit.
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*
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* This kind of 'auto-scaling' is quite sufficient for this interface, as
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* standard DAC peripherals use a fixed conversion resolution internally anyway,
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* so that any particular bit-width configuration on this driver level would not
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* have much effect...
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*
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* @{
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* @file
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* @brief Low-level DAC peripheral driver interface definitions
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* @brief DAC peripheral driver interface definition
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*
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* @author Simon Brummer <simon.brummer@haw-hamburg.de>
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*/
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#ifndef DAC_H
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#define DAC_H
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#ifndef PERIPH_DAC_H
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#define PERIPH_DAC_H
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#include <stdint.h>
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#include <limits.h>
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#include "periph_cpu.h"
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#include "periph_conf.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* guard file in case no DAC device is defined */
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#if DAC_NUMOF
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/**
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* @brief Definition avialable DAC devices
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*
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* Each DAC device is based on a hardware DAC which can have one or more
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* independet channels.
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* @brief Make sure the number of available DAC lines is defined
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* @{
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*/
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typedef enum {
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#if DAC_0_EN
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DAC_0 = 0, /**< DAC device 0 */
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#ifndef DAC_NUMOF
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#define "DAC_NUMOF undefined"
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#endif
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#if DAC_1_EN
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DAC_1 = 1, /**< DAC device 1 */
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#endif
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#if DAC_2_EN
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DAC_2 = 2, /**< DAC device 2 */
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#endif
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#if DAC_3_EN
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DAC_3 = 3, /**< DAC device 3 */
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#endif
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} dac_t;
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/** @} */
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/**
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* @brief Possilbe DAC precision settings
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* @brief Define default DAC type identifier
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* @{
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*/
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typedef enum {
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DAC_RES_6BIT = 0, /**< DAC precision: 6 bit */
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DAC_RES_8BIT, /**< DAC precision: 8 bit */
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DAC_RES_10BIT, /**< DAC precision: 10 bit */
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DAC_RES_12BIT, /**< DAC precision: 12 bit */
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DAC_RES_14BIT, /**< DAC precision: 14 bit */
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DAC_RES_16BIT, /**< DAC precision: 16 bit */
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} dac_precision_t;
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#ifndef HAVE_DAC_T
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typedef unsigned int dac_t;
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#endif
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/** @} */
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/**
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* @brief Initialization of a given DAC device
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* @brief Default DAC undefined value
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* @{
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*/
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#ifndef DAC_UNDEF
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#define DAC_UNDEF (UINT_MAX)
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#endif
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/** @} */
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/**
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* @brief Default DAC access macro
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* @{
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*/
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#ifndef DAC_LINE
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#define DAC_LINE(x) (x)
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#endif
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/** @} */
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/**
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* @brief Initialize the given DAC line
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*
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* The DAC will be initialized with all possilble channels active.
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* On each channel will be initialized with a Zero on it.
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*
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* @param[in] dev the device to initialize
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* @param[in] precision the precision to use for conversion
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* @param[in] line DAC line to initialize
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*
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* @return 0 on success
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* @return -1 on unknown DAC Device
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* @return -2 on precision not available
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* @return -1 on invalid DAC line
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*/
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int8_t dac_init(dac_t dev, dac_precision_t precision);
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int8_t dac_init(dac_t line);
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/**
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* @brief Write a value onto DAC Device on a given Channel.
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*
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* @param[in] dev the DAC device to use
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* @param[in] channel the channel used for Digital/Analoge conversion
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* @param[in] value the value to write onto DAC.
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*
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* @return 0 on success
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* @return -1 on unknown DAC Device
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* @return -2 on invalid channel
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* @return -3 if value is out of range.
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* @param[in] line DAC line to set
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* @param[in] value value to set @p line to
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*/
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int8_t dac_write(dac_t dev, uint8_t channel, uint16_t value);
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void dac_set(dac_t line, uint16_t value);
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/**
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* @brief Enable power for the given DAC Device
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* @brief Enable the given DAC line
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*
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* @param[in] dev the DAC device to power up.
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*
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* @return 0 on success
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* @return -1 on unknown DAC Device
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* @param[in] line DAC line to power on
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*/
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int8_t dac_poweron(dac_t dev);
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void dac_poweron(dac_t line);
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/**
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* @brief Disable power for the given DAC Device
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* @brief Disable the given DAC line
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*
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* @param[in] dev the DAC device to power down
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*
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* @return 0 on success
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* @return -1 on unknown DAC Device
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* @param[in] line DAC line to power off
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*/
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int8_t dac_poweroff(dac_t dev);
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void dac_poweroff(dac_t line);
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/**
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* @brief Helper function to map a given integer range to a valid DAC value.
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*
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* This function is useful for converting ranges of values to a valid DAC output value.
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*
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* The min value is assumed to be smaller than max value and value is assumed
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* to be between min and max.
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*
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* @param[in] dev the DAC Device to read precision value from
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* @param[in] value the value to map onto min and max
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* @param[in] min the lower bound of the target interval
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* @param[in] max the upper bound of the target interval
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*
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* @return the mapped value, in valid DAC range
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*/
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uint16_t dac_map(dac_t dev, int value, int min, int max);
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/**
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* @brief Helper function to map a given float value range to a valid DAC value.
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*
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* @see dac_map
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*
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* @param[in] dev the DAC Device to read precision value from
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* @param[in] value the value to map onto min and max
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* @param[in] min the lower bound of the target interval
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* @param[in] max the upper bound of the target interval
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*
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* @return the mapped value, in valid DAC range
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*/
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uint16_t dac_mapf(dac_t dev, float value, float min, float max);
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#endif/* DAC_NUMOF */
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#ifdef __cplusplus
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}
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#endif
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#endif /* DAC_H */
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#endif /* PERIPH_DAC_H */
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/** @} */
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