px4-firmware/nuttx/drivers/analog/ad5410.c

/************************************************************************************
 * arch/drivers/analog/ad5410.c
 *
 *   Copyright (C) 2011 Li Zhuoyi. All rights reserved.
 *   Author: Li Zhuoyi <lzyy.cn@gmail.com>
 *   History: 0.1 2011-08-05 initial version
 * 
 * This file is a part of NuttX:
 *
 *   Copyright (C) 2010 Gregory Nutt. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ************************************************************************************/

#include <nuttx/config.h>

#include <stdio.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <errno.h>
#include <debug.h>

#include <arch/board/board.h>
#include <nuttx/arch.h>
#include <nuttx/analog/dac.h>
#include <nuttx/spi.h>

#if defined(CONFIG_DAC_AD5410)

#define AD5410_REG_NOP    0x00
#define AD5410_REG_WR     0x01
#define AD5410_REG_RD     0x02
#define AD5410_REG_CMD    0x55
#define AD5410_REG_RST    0x56

#define AD5410_CMD_REXT       (1<<13)
#define AD5410_CMD_OUTEN      (1<<12)
#define AD5410_CMD_SRCLK(x)   (x<<8)  
#define AD5410_CMD_SRSTEP(x)  (x<<5)
#define AD5410_CMD_SREN       (1<<4)
#define AD5410_CMD_DCEN       (1<<3)
#define AD5410_CMD_420MA      0x05
#define AD5410_CMD_020MA      0x06
#define AD5410_CMD_024MA      0x07

/****************************************************************************
 * ad_private Types
 ****************************************************************************/
struct up_dev_s
{
    int devno;
    FAR struct spi_dev_s  *spi;      /* Cached SPI device reference */
};

/****************************************************************************
 * ad_private Function Prototypes
 ****************************************************************************/

/* DAC methods */

static void dac_reset(FAR struct dac_dev_s *dev);
static int  dac_setup(FAR struct dac_dev_s *dev);
static void dac_shutdown(FAR struct dac_dev_s *dev);
static void dac_txint(FAR struct dac_dev_s *dev, bool enable);
static int  dac_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg);
static int  dac_ioctl(FAR struct dac_dev_s *dev, int cmd, unsigned long arg);
static int  dac_interrupt(int irq, void *context);

/****************************************************************************
 * ad_private Data
 ****************************************************************************/

static const struct dac_ops_s g_dacops =
{
    .ao_reset =dac_reset,
    .ao_setup = dac_setup,
    .ao_shutdown = dac_shutdown,
    .ao_txint = dac_txint,
    .ao_send = dac_send,
    .ao_ioctl = dac_ioctl,
};

static struct up_dev_s g_dacpriv;
static struct dac_dev_s g_dacdev =
{
    .ad_ops = &g_dacops,
	.ad_priv= &g_dacpriv,
};

/****************************************************************************
 * ad_private Functions
 ****************************************************************************/

/* Reset the DAC device.  Called early to initialize the hardware. This
* is called, before ao_setup() and on error conditions.
*/
static void dac_reset(FAR struct dac_dev_s *dev)
{

}

/* Configure the DAC. This method is called the first time that the DAC
* device is opened.  This will occur when the port is first opened.
* This setup includes configuring and attaching DAC interrupts.  Interrupts
* are all disabled upon return.
*/
static int  dac_setup(FAR struct dac_dev_s *dev)
{
    FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
    FAR struct spi_dev_s *spi = priv->spi;
	SPI_SELECT(spi, priv->devno, true);
	SPI_SEND(spi,AD5410_REG_CMD);
	SPI_SEND(spi,(AD5410_CMD_OUTEN|AD5410_CMD_420MA)>>8);
	SPI_SEND(spi,AD5410_CMD_OUTEN|AD5410_CMD_420MA);
	SPI_SELECT(spi, priv->devno, false);
    return OK;
}

/* Disable the DAC.  This method is called when the DAC device is closed.
* This method reverses the operation the setup method.
*/
static void dac_shutdown(FAR struct dac_dev_s *dev)
{
}

/* Call to enable or disable TX interrupts */
static void dac_txint(FAR struct dac_dev_s *dev, bool enable)
{
}

static int  dac_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
{
    FAR struct up_dev_s *priv = (FAR struct up_dev_s *)dev->ad_priv;
    FAR struct spi_dev_s *spi = priv->spi;
	SPI_SELECT(spi, priv->devno, true);
	SPI_SEND(spi,AD5410_REG_WR);
	SPI_SEND(spi,(uint8_t)(msg->am_data>>24));
	SPI_SEND(spi,(uint8_t)(msg->am_data>>16));
	SPI_SELECT(spi, priv->devno, false);
	dac_txdone(&g_dacdev);
	return 0;
}

/* All ioctl calls will be routed through this method */
static int  dac_ioctl(FAR struct dac_dev_s *dev, int cmd, unsigned long arg)
{
    dbg("Fix me:Not Implemented\n");
    return 0;
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: up_ad5410cinitialize
 *
 * Description:
 *   Initialize the selected DAC port
 *
 * Input Parameter:
 *   Port number (for hardware that has mutiple DAC interfaces)
 *
 * Returned Value:
 *   Valid ad5410 device structure reference on succcess; a NULL on failure
 *
 ****************************************************************************/

FAR struct dac_dev_s *up_ad5410initialize(FAR struct spi_dev_s *spi, unsigned int devno)
{
    FAR struct up_dev_s *priv = (FAR struct up_dev_s *)g_dacdev.ad_priv;
	priv->spi=spi;
	priv->devno=devno;
	return &g_dacdev;
}
#endif