/**************************************************************************** * arch/drivers/analog/dac7554.c * * Copyright (C) 2010, 2016, 2018 Gregory Nutt. All rights reserved. * Copyright (C) 2018 Daniel P. Carvalho. All rights reserved. * Copyright (C) 2019 Augusto Fraga Giachero. All rights reserved. * Author: Augusto Fraga Giachero * * This file is a part of NuttX: * * Copyright (C) 2019 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_SPI) # error SPI Support Required. #endif #if defined(CONFIG_DAC7554) #ifndef CONFIG_DAC7554_SPI_FREQUENCY # define CONFIG_DAC7554_SPI_FREQUENCY 1000000 #endif #define DAC7554_SPI_MODE (SPIDEV_MODE2) /* SPI Mode 2: CPOL=1,CPHA=0 */ /**************************************************************************** * Private Types ****************************************************************************/ struct dac7554_dev_s { FAR struct spi_dev_s *spi; /* SPI interface */ int spidev; /* SPI Chip Select number */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* I2C Helpers */ /* DAC methods */ static void dac7554_reset(FAR struct dac_dev_s *dev); static int dac7554_setup(FAR struct dac_dev_s *dev); static void dac7554_shutdown(FAR struct dac_dev_s *dev); static void dac7554_txint(FAR struct dac_dev_s *dev, bool enable); static int dac7554_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg); static int dac7554_ioctl(FAR struct dac_dev_s *dev, int cmd, unsigned long arg); /**************************************************************************** * Private Data ****************************************************************************/ static const struct dac_ops_s g_dacops = { .ao_reset = dac7554_reset, .ao_setup = dac7554_setup, .ao_shutdown = dac7554_shutdown, .ao_txint = dac7554_txint, .ao_send = dac7554_send, .ao_ioctl = dac7554_ioctl, }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: dac7554_configspi * * Description: * Configure the SPI interface * ****************************************************************************/ static inline void dac7554_configspi(FAR struct spi_dev_s *spi) { SPI_SETMODE(spi, DAC7554_SPI_MODE); SPI_SETBITS(spi, 8); SPI_HWFEATURES(spi, 0); SPI_SETFREQUENCY(spi, CONFIG_DAC7554_SPI_FREQUENCY); } /**************************************************************************** * Name: dac7554_reset * * Description: * Reset the DAC device. Called early to initialize the hardware. This * is called, before ao_setup() and on error conditions. * ****************************************************************************/ static void dac7554_reset(FAR struct dac_dev_s *dev) { } /**************************************************************************** * Name: dac7554_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 dac7554_setup(FAR struct dac_dev_s *dev) { return OK; } /**************************************************************************** * Name: dac7554_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 dac7554_shutdown(FAR struct dac_dev_s *dev) { } /**************************************************************************** * Name: dac7554_txint * * Description: * Call to enable or disable TX interrupts * ****************************************************************************/ static void dac7554_txint(FAR struct dac_dev_s *dev, bool enable) { } /**************************************************************************** * Name: dac7554_send ****************************************************************************/ static int dac7554_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg) { FAR struct dac7554_dev_s *priv = (FAR struct dac7554_dev_s *)dev->ad_priv; uint16_t data; /* Sanity check */ DEBUGASSERT(priv->SPI != NULL); /* Set up message to send */ ainfo("value: %08x\n", msg->am_data); SPI_LOCK(priv->spi, true); dac7554_configspi(priv->spi); data = ((msg->am_data >> 16) & 0x0fff) | ((msg->am_channel & 0x03) << 12) | (1 << 15); SPI_SELECT(priv->spi, priv->spidev, true); SPI_SEND(priv->spi, (data >> 8)); SPI_SEND(priv->spi, (data & 0xff)); SPI_SELECT(priv->spi, priv->spidev, false); SPI_LOCK(priv->spi, false); dac_txdone(dev); return 0; } /**************************************************************************** * Name: dac7554_ioctl ****************************************************************************/ static int dac7554_ioctl(FAR struct dac_dev_s *dev, int cmd, unsigned long arg) { return -ENOTTY; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: dac7554_initialize * * Description: * Initialize DAC * * Input Parameters: * Port number (for hardware that has multiple DAC interfaces) * * Returned Value: * Valid DAC7554 device structure reference on success; a NULL on failure * ****************************************************************************/ FAR struct dac_dev_s *dac7554_initialize(FAR struct spi_dev_s *spi, int spidev) { FAR struct dac7554_dev_s *priv; FAR struct dac_dev_s *g_dacdev; /* Sanity check */ DEBUGASSERT(i2c != NULL); /* Initialize the DAC7554 device structure */ priv = (FAR struct dac7554_dev_s *)kmm_malloc(sizeof(struct dac7554_dev_s)); priv->spi = spi; priv->spidev = spidev; g_dacdev = (FAR struct dac_dev_s *)kmm_malloc(sizeof(struct dac_dev_s)); g_dacdev->ad_ops = &g_dacops; g_dacdev->ad_priv = priv; return g_dacdev; } #endif /* CONFIG_DAC7554 */