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- /****************************************************************************
- * arch/drivers/analog/dac7571.c
- *
- * Copyright (C) 2010, 2016, 2018 Gregory Nutt. All rights reserved.
- * Copyright (C) 2018 Daniel P. Carvalho. All rights reserved.
- * Author: Daniel P. Carvalho <danieloak@gmail.com>
- *
- * 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.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #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 <nuttx/arch.h>
- #include <nuttx/analog/dac.h>
- #include <nuttx/i2c/i2c_master.h>
- /****************************************************************************
- * Preprocessor definitions
- ****************************************************************************/
- #if !defined(CONFIG_I2C)
- # error I2C Support Required.
- #endif
- #if defined(CONFIG_DAC7571)
- /* Operating modes - not controllable by user */
- #define DAC7571_CONFIG_OPMODE_SHIFT 4
- #define DAC7571_CONFIG_OPMODE_MASK (0x0F << DAC7571_CONFIG_OPMODE_SHIFT)
- #define DAC7571_CONFIG_OPMODE_NORMAL (0 << DAC7571_CONFIG_OPMODE_SHIFT)
- #define DAC7571_CONFIG_OPMODE_1K_PWD (1 << DAC7571_CONFIG_OPMODE_SHIFT)
- #define DAC7571_CONFIG_OPMODE_100K_PWD (2 << DAC7571_CONFIG_OPMODE_SHIFT)
- #define DAC7571_CONFIG_OPMODE_HZ_PWD (3 << DAC7571_CONFIG_OPMODE_SHIFT)
- #ifndef CONFIG_DAC7571_I2C_FREQUENCY
- # define CONFIG_DAC7571_I2C_FREQUENCY 400000
- #endif
- #define I2C_NOSTARTSTOP_MSGS 2
- #define I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX 0
- #define I2C_NOSTARTSTOP_DATA_MSG_INDEX 1
- /****************************************************************************
- * Private Types
- ****************************************************************************/
- struct dac7571_dev_s
- {
- FAR struct i2c_master_s *i2c; /* I2C interface */
- uint8_t addr; /* I2C address */
- uint16_t state; /* DAC7571 current state */
- };
- /****************************************************************************
- * Private Function Prototypes
- ****************************************************************************/
- /* I2C Helpers */
- /* DAC methods */
- static void dac7571_reset(FAR struct dac_dev_s *dev);
- static int dac7571_setup(FAR struct dac_dev_s *dev);
- static void dac7571_shutdown(FAR struct dac_dev_s *dev);
- static void dac7571_txint(FAR struct dac_dev_s *dev, bool enable);
- static int dac7571_send(FAR struct dac_dev_s *dev,
- FAR struct dac_msg_s *msg);
- static int dac7571_ioctl(FAR struct dac_dev_s *dev, int cmd,
- unsigned long arg);
- /****************************************************************************
- * Private Data
- ****************************************************************************/
- static struct dac7571_dev_s g_dacpriv;
- static const struct dac_ops_s g_dacops =
- {
- .ao_reset = dac7571_reset,
- .ao_setup = dac7571_setup,
- .ao_shutdown = dac7571_shutdown,
- .ao_txint = dac7571_txint,
- .ao_send = dac7571_send,
- .ao_ioctl = dac7571_ioctl,
- };
- static struct dac_dev_s g_dacdev =
- {
- .ad_ops = &g_dacops,
- .ad_priv = &g_dacpriv,
- };
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: dac7571_reset
- *
- * Description:
- * Reset the DAC device. Called early to initialize the hardware. This
- * is called, before ao_setup() and on error conditions.
- *
- ****************************************************************************/
- static void dac7571_reset(FAR struct dac_dev_s *dev)
- {
- }
- /****************************************************************************
- * Name: dac7571_setup
- *
- * Description:
- * 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 dac7571_setup(FAR struct dac_dev_s *dev)
- {
- return OK;
- }
- /****************************************************************************
- * Name: dac7571_shutdown
- *
- * Description:
- * Disable the DAC. This method is called when the DAC device is closed.
- * This method reverses the operation the setup method.
- *
- ****************************************************************************/
- static void dac7571_shutdown(FAR struct dac_dev_s *dev)
- {
- }
- /****************************************************************************
- * Name: dac7571_txint
- *
- * Description:
- * Call to enable or disable TX interrupts
- *
- ****************************************************************************/
- static void dac7571_txint(FAR struct dac_dev_s *dev, bool enable)
- {
- }
- /****************************************************************************
- * Name: dac7571_send
- ****************************************************************************/
- static int dac7571_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
- {
- FAR struct dac7571_dev_s *priv = (FAR struct dac7571_dev_s *)dev->ad_priv;
- struct i2c_config_s config;
- int ret;
- /* Sanity check */
- DEBUGASSERT(priv->i2c != NULL);
- /* Set up message to send */
- ainfo("value: %08x\n", msg->am_data);
- uint8_t const BUFFER_SIZE = 2;
- uint8_t buffer[BUFFER_SIZE];
- buffer[0] = (uint8_t)(msg->am_data >> 8);
- buffer[0] &= ~(DAC7571_CONFIG_OPMODE_MASK); /* only normal op mode supported */
- buffer[1] = (uint8_t)(msg->am_data);
- /* Set up the I2C configuration */
- config.frequency = CONFIG_DAC7571_I2C_FREQUENCY;
- config.address = priv->addr;
- config.addrlen = 7;
- /* Then perform the transfer. */
- ret = i2c_write(priv->i2c, &config, buffer, BUFFER_SIZE);
- if (ret < 0)
- {
- aerr("ERROR: dac7571_send failed code:%d\n", ret);
- }
- dac_txdone(&g_dacdev);
- return ret;
- }
- /****************************************************************************
- * Name: dac7571_ioctl
- ****************************************************************************/
- static int dac7571_ioctl(FAR struct dac_dev_s *dev, int cmd,
- unsigned long arg)
- {
- return -ENOTTY;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: dac7571_initialize
- *
- * Description:
- * Initialize DAC
- *
- * Input Parameters:
- * Port number (for hardware that has multiple DAC interfaces)
- *
- * Returned Value:
- * Valid DAC7571 device structure reference on success; a NULL on failure
- *
- ****************************************************************************/
- FAR struct dac_dev_s *dac7571_initialize(FAR struct i2c_master_s *i2c,
- uint8_t addr)
- {
- FAR struct dac7571_dev_s *priv;
- /* Sanity check */
- DEBUGASSERT(i2c != NULL);
- /* Initialize the DAC7571 device structure */
- priv = (FAR struct dac7571_dev_s *)g_dacdev.ad_priv;
- priv->i2c = i2c;
- priv->addr = addr;
- return &g_dacdev;
- }
- #endif /* CONFIG_DAC7571 */
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