a752c7ab
 elopes
add first test an...
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/*
* Copyright (C) 2014 Simon Brummer
* 2015-2016 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup drivers_periph_dac DAC
* @ingroup drivers_periph
* @brief DAC peripheral driver interface
*
* Similar to the ADC driver interface (@ref drivers_periph_adc), the DAC
* interface uses the concept of lines, corresponds to a tuple of a DAC device
* and a DAC output channel.
*
* The DAC interface expects data to be served as a 16-bit unsigned integer,
* independent of the actual resolution of the hardware device. It is up to the
* DAC driver, to scale the given value to the maximal width that can be
* handled. The device driver should, on the other hand, implement the DAC in a
* way, that it will use the bit width, that comes closest to 16-bit.
*
* This kind of 'auto-scaling' is quite sufficient for this interface, as
* standard DAC peripherals use a fixed conversion resolution internally anyway,
* so that any particular bit-width configuration on this driver level would not
* have much effect...
*
* @{
* @file
* @brief DAC peripheral driver interface definition
*
* @author Simon Brummer <simon.brummer@haw-hamburg.de>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef PERIPH_DAC_H
#define PERIPH_DAC_H
#include <stdint.h>
#include <limits.h>
#include "periph_cpu.h"
#include "periph_conf.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Define default DAC type identifier
*/
#ifndef HAVE_DAC_T
typedef unsigned int dac_t;
#endif
/**
* @brief Return codes used by the DAC driver interface
*/
enum {
DAC_OK = 0,
DAC_NOLINE = -1
};
/**
* @brief Default DAC undefined value
*/
#ifndef DAC_UNDEF
#define DAC_UNDEF (UINT_MAX)
#endif
/**
* @brief Default DAC access macro
*/
#ifndef DAC_LINE
#define DAC_LINE(x) (x)
#endif
/**
* @brief Initialize the given DAC line
*
* After initialization, the corresponding DAC line is active and its output is
* set to 0.
*
* @param[in] line DAC line to initialize
*
* @return DAC_OK on success
* @return DAC_NOLINE on invalid DAC line
*/
int8_t dac_init(dac_t line);
/**
* @brief Write a value onto DAC Device on a given Channel
*
* The value is always given as 16-bit value and is internally scaled to the
* actual resolution that the DAC unit provides (e.g. 12-bit). So to get the
* maximum output voltage, this function has to be called with @p value set to
* 65535 (UINT16_MAX).
*
* @param[in] line DAC line to set
* @param[in] value value to set @p line to
*/
void dac_set(dac_t line, uint16_t value);
/**
* @brief Enable the given DAC line
*
* @param[in] line DAC line to power on
*/
void dac_poweron(dac_t line);
/**
* @brief Disable the given DAC line
*
* @param[in] line DAC line to power off
*/
void dac_poweroff(dac_t line);
#ifdef __cplusplus
}
#endif
#endif /* PERIPH_DAC_H */
/** @} */
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