/**************************************************************************** * 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 * * 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 #include #include #include #include #include #include #include #include #include #include /**************************************************************************** * 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 */