282 lines
8.8 KiB
C
282 lines
8.8 KiB
C
/****************************************************************************
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* drivers/analog/dac7554.c
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*
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* Copyright (C) 2010, 2016, 2018 Gregory Nutt. All rights reserved.
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* Copyright (C) 2018 Daniel P. Carvalho. All rights reserved.
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* Copyright (C) 2019 Augusto Fraga Giachero. All rights reserved.
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* Author: Augusto Fraga Giachero <afg@augustofg.net>
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*
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* This file is a part of NuttX:
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/arch.h>
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#include <nuttx/analog/dac.h>
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#include <nuttx/spi/spi.h>
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/****************************************************************************
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* Preprocessor definitions
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****************************************************************************/
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#if !defined(CONFIG_SPI)
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# error SPI Support Required.
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#endif
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#if defined(CONFIG_DAC7554)
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#ifndef CONFIG_DAC7554_SPI_FREQUENCY
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# define CONFIG_DAC7554_SPI_FREQUENCY 1000000
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#endif
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#define DAC7554_SPI_MODE (SPIDEV_MODE2) /* SPI Mode 2: CPOL=1,CPHA=0 */
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct dac7554_dev_s
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{
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FAR struct spi_dev_s *spi; /* SPI interface */
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int spidev; /* SPI Chip Select number */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* I2C Helpers */
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/* DAC methods */
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static void dac7554_reset(FAR struct dac_dev_s *dev);
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static int dac7554_setup(FAR struct dac_dev_s *dev);
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static void dac7554_shutdown(FAR struct dac_dev_s *dev);
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static void dac7554_txint(FAR struct dac_dev_s *dev, bool enable);
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static int dac7554_send(FAR struct dac_dev_s *dev,
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FAR struct dac_msg_s *msg);
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static int dac7554_ioctl(FAR struct dac_dev_s *dev, int cmd,
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unsigned long arg);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct dac_ops_s g_dacops =
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{
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.ao_reset = dac7554_reset,
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.ao_setup = dac7554_setup,
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.ao_shutdown = dac7554_shutdown,
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.ao_txint = dac7554_txint,
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.ao_send = dac7554_send,
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.ao_ioctl = dac7554_ioctl,
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dac7554_configspi
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*
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* Description:
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* Configure the SPI interface
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*
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****************************************************************************/
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static inline void dac7554_configspi(FAR struct spi_dev_s *spi)
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{
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SPI_SETMODE(spi, DAC7554_SPI_MODE);
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SPI_SETBITS(spi, 8);
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SPI_HWFEATURES(spi, 0);
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SPI_SETFREQUENCY(spi, CONFIG_DAC7554_SPI_FREQUENCY);
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}
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/****************************************************************************
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* Name: dac7554_reset
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*
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* Description:
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* Reset the DAC device. Called early to initialize the hardware. This
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* is called, before ao_setup() and on error conditions.
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*
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****************************************************************************/
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static void dac7554_reset(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: dac7554_setup
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*
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* Description:
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* Configure the DAC. This method is called the first time that the DAC
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* device is opened. This will occur when the port is first opened.
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* This setup includes configuring and attaching DAC interrupts. Interrupts
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* are all disabled upon return.
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*
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****************************************************************************/
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static int dac7554_setup(FAR struct dac_dev_s *dev)
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{
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return OK;
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}
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/****************************************************************************
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* Name: dac7554_shutdown
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*
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* Description:
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* Disable the DAC. This method is called when the DAC device is closed.
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* This method reverses the operation the setup method.
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*
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****************************************************************************/
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static void dac7554_shutdown(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: dac7554_txint
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*
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* Description:
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* Call to enable or disable TX interrupts
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*
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****************************************************************************/
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static void dac7554_txint(FAR struct dac_dev_s *dev, bool enable)
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{
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}
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/****************************************************************************
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* Name: dac7554_send
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****************************************************************************/
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static int dac7554_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
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{
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FAR struct dac7554_dev_s *priv = (FAR struct dac7554_dev_s *)dev->ad_priv;
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uint16_t data;
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/* Sanity check */
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DEBUGASSERT(priv->spi != NULL);
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/* Set up message to send */
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ainfo("value: %08x\n", msg->am_data);
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SPI_LOCK(priv->spi, true);
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dac7554_configspi(priv->spi);
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data = ((msg->am_data >> 16) & 0x0fff) | ((msg->am_channel & 0x03) << 12) |
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(1 << 15);
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SPI_SELECT(priv->spi, priv->spidev, true);
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SPI_SEND(priv->spi, (data >> 8));
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SPI_SEND(priv->spi, (data & 0xff));
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SPI_SELECT(priv->spi, priv->spidev, false);
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SPI_LOCK(priv->spi, false);
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dac_txdone(dev);
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return 0;
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}
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/****************************************************************************
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* Name: dac7554_ioctl
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****************************************************************************/
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static int dac7554_ioctl(FAR struct dac_dev_s *dev, int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: dac7554_initialize
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*
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* Description:
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* Initialize DAC
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*
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* Input Parameters:
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* Port number (for hardware that has multiple DAC interfaces)
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*
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* Returned Value:
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* Valid DAC7554 device structure reference on success; a NULL on failure
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*
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****************************************************************************/
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FAR struct dac_dev_s *dac7554_initialize(FAR struct spi_dev_s *spi,
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int spidev)
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{
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FAR struct dac7554_dev_s *priv;
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FAR struct dac_dev_s *g_dacdev;
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/* Sanity check */
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DEBUGASSERT(spi != NULL);
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/* Initialize the DAC7554 device structure */
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priv =
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(FAR struct dac7554_dev_s *)kmm_malloc(sizeof(struct dac7554_dev_s));
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priv->spi = spi;
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priv->spidev = spidev;
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g_dacdev = (FAR struct dac_dev_s *)kmm_malloc(sizeof(struct dac_dev_s));
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g_dacdev->ad_ops = &g_dacops;
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g_dacdev->ad_priv = priv;
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return g_dacdev;
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}
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#endif /* CONFIG_DAC7554 */
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