282 lines
9.0 KiB
C
282 lines
9.0 KiB
C
/****************************************************************************
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* arch/drivers/analog/dac7571.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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* Author: Daniel P. Carvalho <danieloak@gmail.com>
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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) 2010 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 <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/analog/dac.h>
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#include <nuttx/i2c/i2c_master.h>
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/****************************************************************************
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* Preprocessor definitions
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****************************************************************************/
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#if !defined(CONFIG_I2C)
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# error I2C Support Required.
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#endif
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#if defined(CONFIG_DAC7571)
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/* Operating modes - not controllable by user */
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#define DAC7571_CONFIG_OPMODE_SHIFT 4
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#define DAC7571_CONFIG_OPMODE_MASK (0x0F << DAC7571_CONFIG_OPMODE_SHIFT)
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#define DAC7571_CONFIG_OPMODE_NORMAL (0 << DAC7571_CONFIG_OPMODE_SHIFT)
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#define DAC7571_CONFIG_OPMODE_1K_PWD (1 << DAC7571_CONFIG_OPMODE_SHIFT)
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#define DAC7571_CONFIG_OPMODE_100K_PWD (2 << DAC7571_CONFIG_OPMODE_SHIFT)
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#define DAC7571_CONFIG_OPMODE_HZ_PWD (3 << DAC7571_CONFIG_OPMODE_SHIFT)
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#ifndef CONFIG_DAC7571_I2C_FREQUENCY
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# define CONFIG_DAC7571_I2C_FREQUENCY 400000
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#endif
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#define I2C_NOSTARTSTOP_MSGS 2
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#define I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX 0
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#define I2C_NOSTARTSTOP_DATA_MSG_INDEX 1
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct dac7571_dev_s
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{
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FAR struct i2c_master_s *i2c; /* I2C interface */
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uint8_t addr; /* I2C address */
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uint16_t state; /* DAC7571 current state */
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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 dac7571_reset(FAR struct dac_dev_s *dev);
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static int dac7571_setup(FAR struct dac_dev_s *dev);
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static void dac7571_shutdown(FAR struct dac_dev_s *dev);
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static void dac7571_txint(FAR struct dac_dev_s *dev, bool enable);
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static int dac7571_send(FAR struct dac_dev_s *dev,
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FAR struct dac_msg_s *msg);
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static int dac7571_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 struct dac7571_dev_s g_dacpriv;
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static const struct dac_ops_s g_dacops =
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{
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.ao_reset = dac7571_reset,
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.ao_setup = dac7571_setup,
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.ao_shutdown = dac7571_shutdown,
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.ao_txint = dac7571_txint,
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.ao_send = dac7571_send,
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.ao_ioctl = dac7571_ioctl,
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};
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static struct dac_dev_s g_dacdev =
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{
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.ad_ops = &g_dacops,
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.ad_priv = &g_dacpriv,
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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: dac7571_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 dac7571_reset(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: dac7571_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 dac7571_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: dac7571_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 dac7571_shutdown(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: dac7571_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 dac7571_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: dac7571_send
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****************************************************************************/
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static int dac7571_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
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{
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FAR struct dac7571_dev_s *priv = (FAR struct dac7571_dev_s *)dev->ad_priv;
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struct i2c_config_s config;
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int ret;
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/* Sanity check */
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DEBUGASSERT(priv->i2c != 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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uint8_t const BUFFER_SIZE = 2;
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uint8_t buffer[BUFFER_SIZE];
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buffer[0] = (uint8_t)(msg->am_data >> 8);
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buffer[0] &= ~(DAC7571_CONFIG_OPMODE_MASK); /* only normal op mode supported */
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buffer[1] = (uint8_t)(msg->am_data);
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/* Set up the I2C configuration */
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config.frequency = CONFIG_DAC7571_I2C_FREQUENCY;
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config.address = priv->addr;
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config.addrlen = 7;
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/* Then perform the transfer. */
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ret = i2c_write(priv->i2c, &config, buffer, BUFFER_SIZE);
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if (ret < 0)
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{
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aerr("ERROR: dac7571_send failed code:%d\n", ret);
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}
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dac_txdone(&g_dacdev);
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return ret;
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}
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/****************************************************************************
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* Name: dac7571_ioctl
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****************************************************************************/
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static int dac7571_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: dac7571_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 DAC7571 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 *dac7571_initialize(FAR struct i2c_master_s *i2c,
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uint8_t addr)
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{
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FAR struct dac7571_dev_s *priv;
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/* Sanity check */
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DEBUGASSERT(i2c != NULL);
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/* Initialize the DAC7571 device structure */
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priv = (FAR struct dac7571_dev_s *)g_dacdev.ad_priv;
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priv->i2c = i2c;
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priv->addr = addr;
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return &g_dacdev;
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}
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#endif /* CONFIG_DAC7571 */
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