MCUXpresso_LPC845/devices/LPC845/drivers/fsl_dac.h

/*
 * Copyright 2017-2020 NXP
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#ifndef __FSL_DAC_H__
#define __FSL_DAC_H__

#include "fsl_common.h"

/*!
 * @addtogroup lpc_dac
 * @{
 */

/*! @file */

/*******************************************************************************
 * Definitions
 ******************************************************************************/

/*! @name Driver version */
/*@{*/
/*! @brief DAC driver version 2.0.2. */
#define LPC_DAC_DRIVER_VERSION (MAKE_VERSION(2, 0, 2))
/*@}*/

/*!
 * @brief The DAC settling time.
 */
typedef enum _dac_settling_time
{
    kDAC_SettlingTimeIs1us = 0U,  /*!< The settling time of the DAC is 1us max, and the maximum
                                       current is 700 mA. This allows a maximum update rate of 1 MHz. */
    kDAC_SettlingTimeIs25us = 1U, /*!< The settling time of the DAC is 2.5us and the maximum current
                                       is 350uA. This allows a maximum update rate of 400 kHz. */
} dac_settling_time_t;

/*!
 * @brief The configuration of DAC.
 */
typedef struct _dac_config
{
    dac_settling_time_t settlingTime; /*!< The settling times are valid for a capacitance load on the DAC_OUT pin not
                                           exceeding 100 pF. A load impedance value greater than that value will cause
                                           settling time longer than the specified time. One or more graphs of load
                                           impedance vs. settling time will be included in the final data sheet. */
} dac_config_t;

#if defined(__cplusplus)
extern "C" {
#endif

/*******************************************************************************
 * API
 ******************************************************************************/
/*!
 * @brief Initialize the DAC module.
 *
 * @param base DAC peripheral base address.
 * @param config The pointer to configuration structure. Please refer to "dac_config_t" structure.
 */
void DAC_Init(DAC_Type *base, const dac_config_t *config);

/*!
 * @brief De-Initialize the DAC module.
 *
 * @param base DAC peripheral base address.
 */
void DAC_Deinit(DAC_Type *base);

/*!
 * @brief Initializes the DAC user configuration structure.
 *
 * This function initializes the user configuration structure to a default value. The default values are as follows.
 * @code
 *   config->settlingTime = kDAC_SettlingTimeIs1us;
 * @endcode
 * @param config Pointer to the configuration structure. See "dac_config_t".
 */
void DAC_GetDefaultConfig(dac_config_t *config);

/*!
 * @brief Enable/Diable double-buffering feature. Notice: Disabling the double-buffering feature will disable counter
 * opreation.
 *        If double-buffering feature is disabled, any writes to the CR address will go directly to the CR register.
 *        If double-buffering feature is enabled, any write to the CR register will only load the pre-buffer,
 *        which shares its register address with the CR register. The CR itself will be loaded from the pre-buffer
 *        whenever the counter reaches zero and the DMA request is set.
 *
 * @param base DAC peripheral base address.
 * @param enable Enable or disable the feature.
 */
void DAC_EnableDoubleBuffering(DAC_Type *base, bool enable);

/*!
 * @brief Write DAC output value into CR register or pre-buffer. The DAC output voltage is VALUE*((VREFP)/1024).
 *
 * @param base DAC peripheral base address.
 * @param value Setting the value for items in the buffer. 10-bits are available.
 */
void DAC_SetBufferValue(DAC_Type *base, uint32_t value);

/*!
 * @brief Write DAC counter value into CNTVAL register.
 *        When the counter is enabled bit, the 16-bit counter will begin counting down, at the rate selected by PCLK,
 *        from the value programmed into the DACCNTVAL register. The counter is decremented Each time the counter
 * reaches zero, the counter will be reloaded by the value of DACCNTVAL and the DMA request bit INT_DMA_REQ will be set
 * in hardware.
 *
 * @param base DAC peripheral basic address.
 * @param value Setting the value for items in the counter. 16-bits are available.
 */
void DAC_SetCounterValue(DAC_Type *base, uint32_t value);

#if defined(FSL_FEATURE_DAC_HAS_CTRL_DMA_ENA) && FSL_FEATURE_DAC_HAS_CTRL_DMA_ENA
/*!
 * @brief Enable/Disable the DMA access.
 *
 * @param base DAC peripheral base address.
 * @param enable Enable or disable the feature.
 */
static inline void DAC_EnableDMA(DAC_Type *base, bool enable)
{
    if (enable)
    {
        base->CTRL |= DAC_CTRL_DMA_ENA_MASK;
    }
    else
    {
        base->CTRL &= ~DAC_CTRL_DMA_ENA_MASK;
    }
}
#endif /* FSL_FEATURE_DAC_HAS_CTRL_DMA_ENA */

/*!
 * @brief Enable/Disable the counter operation.
 *
 * @param base DAC peripheral base address.
 * @param enable Enable or disable the feature.
 */
static inline void DAC_EnableCounter(DAC_Type *base, bool enable)
{
    if (enable)
    {
        base->CTRL |= DAC_CTRL_CNT_ENA_MASK;
    }
    else
    {
        base->CTRL &= ~DAC_CTRL_CNT_ENA_MASK;
    }
}

/*!
 * @brief Get the status flag of DMA or interrupt request.
 *
 * @param base DAC peripheral base address.
 * @return If return 'true', it means DMA request or interrupt occurs.
 *         If return 'false', it means DMA request or interrupt doesn't occur.
 */
static inline bool DAC_GetDMAInterruptRequestFlag(DAC_Type *base)
{
#if defined(FSL_FEATURE_DAC_HAS_CTRL_DMA_ENA) && FSL_FEATURE_DAC_HAS_CTRL_DMA_ENA
    if (0U != (DAC_CTRL_INT_DMA_REQ_MASK & base->CTRL))
#else
    if (0U != (DAC_CTRL_INT_CPU_REQ_MASK & base->CTRL))
#endif /* FSL_FEATURE_DAC_HAS_CTRL_DMA_ENA */
    {
        return true;
    }
    else
    {
        return false;
    }
}

#if defined(__cplusplus)
}
#endif

/* @} */

#endif /* __FSL_DAC_H__ */