363 lines
10 KiB
C
363 lines
10 KiB
C
/****************************************************************************
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* drivers/analog/mcp48xx.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include <nuttx/analog/mcp48xx.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_MCP48XX)
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#if defined(CONFIG_MCP4802)
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# define MCP48XX_DATA_BITS 8u
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#elif defined(CONFIG_MCP4812)
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# define MCP48XX_DATA_BITS 10u
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#elif defined(CONFIG_MCP4822)
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# define MCP48XX_DATA_BITS 12u
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#else
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# error MCP48XX variant selection required
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#endif
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#ifndef CONFIG_MCP48XX_SPI_FREQUENCY
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# define CONFIG_MCP48XX_SPI_FREQUENCY 4000000
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#endif
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#define MCP48XX_SPI_MODE (SPIDEV_MODE0) /* SPI Mode 0: CPOL=0 CPHA=0 */
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#define MCP48XX_MAX_CHANNELS 2u
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#define MCP48XX_SHDN (1u << 12) /* Output Shutdown Control bit */
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#define MCP48XX_GA (1u << 13) /* Output Gain Selection bit */
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#define MCP48XX_MAX_BITS 12u
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#define MCP48XX_DATA_MASK ((1u << MCP48XX_DATA_BITS) - 1u)
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#define MCP48XX_DATA_SHIFT (MCP48XX_MAX_BITS - MCP48XX_DATA_BITS)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct mcp48xx_dev_s
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{
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FAR struct spi_dev_s *spi; /* SPI interface */
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uint32_t spidev; /* SPI Chip Select number */
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uint16_t cmd[MCP48XX_MAX_CHANNELS]; /* Output Gain Selection and Output
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* Shutdown Control bits */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* DAC methods */
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static void mcp48xx_reset(FAR struct dac_dev_s *dev);
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static int mcp48xx_setup(FAR struct dac_dev_s *dev);
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static void mcp48xx_shutdown(FAR struct dac_dev_s *dev);
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static void mcp48xx_txint(FAR struct dac_dev_s *dev, bool enable);
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static int mcp48xx_send(FAR struct dac_dev_s *dev,
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FAR struct dac_msg_s *msg);
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static int mcp48xx_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 mcp48xx_dev_s g_devpriv;
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static const struct dac_ops_s g_dacops =
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{
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mcp48xx_reset, /* ao_reset */
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mcp48xx_setup, /* ao_setup */
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mcp48xx_shutdown, /* ao_shutdown */
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mcp48xx_txint, /* ao_txint */
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mcp48xx_send, /* ao_send */
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mcp48xx_ioctl /* ao_ioctl */
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};
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static struct dac_dev_s g_dacdev =
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{
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&g_dacops, /* ad_ops */
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&g_devpriv /* ad_priv */
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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: mcp48xx_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 mcp48xx_configspi(FAR struct spi_dev_s *spi)
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{
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SPI_SETMODE(spi, MCP48XX_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_MCP48XX_SPI_FREQUENCY);
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}
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/****************************************************************************
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* Name: mcp48xx_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 mcp48xx_reset(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: mcp48xx_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. This
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* setup includes configuring and attaching DAC interrupts. Interrupts are
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* all disabled upon return.
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*
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****************************************************************************/
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static int mcp48xx_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: mcp48xx_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 mcp48xx_shutdown(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: mcp48xx_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 mcp48xx_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: mcp48xx_send
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****************************************************************************/
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static int mcp48xx_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
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{
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FAR struct mcp48xx_dev_s *priv = (FAR struct mcp48xx_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: %08"PRIx32"\n", msg->am_data);
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SPI_LOCK(priv->spi, true);
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mcp48xx_configspi(priv->spi);
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data = ((msg->am_data & MCP48XX_DATA_MASK) << MCP48XX_DATA_SHIFT)
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| ((msg->am_channel & 0x01) << 15)
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| priv->cmd[msg->am_channel & 0x01];
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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: mcp48xx_ioctl
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****************************************************************************/
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static int mcp48xx_ioctl(FAR struct dac_dev_s *dev, int cmd,
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unsigned long arg)
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{
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FAR struct mcp48xx_dev_s *priv = (FAR struct mcp48xx_dev_s *)dev->ad_priv;
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int ret = OK;
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switch (cmd)
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{
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case ANIOC_MCP48XX_DAC_SET_GAIN:
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{
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int i;
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if ((arg & MCP48XX_GAIN_1X) != 0)
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{
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for (i = 0; i < MCP48XX_MAX_CHANNELS; i++)
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{
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if ((arg & (1u << i)) != 0)
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{
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priv->cmd[i] |= MCP48XX_GA;
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}
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}
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}
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else
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{
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for (i = 0; i < MCP48XX_MAX_CHANNELS; i++)
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{
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if ((arg & (1u << i)) != 0)
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{
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priv->cmd[i] &= ~MCP48XX_GA;
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}
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}
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}
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}
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break;
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case ANIOC_MCP48XX_DAC_ENABLE:
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{
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int i;
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for (i = 0; i < MCP48XX_MAX_CHANNELS; i++)
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{
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if ((arg & (1u << i)) != 0)
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{
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priv->cmd[i] |= MCP48XX_SHDN;
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}
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}
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}
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break;
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case ANIOC_MCP48XX_DAC_DISABLE:
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{
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int i;
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for (i = 0; i < MCP48XX_MAX_CHANNELS; i++)
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{
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if ((arg & (1u << i)) != 0)
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{
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priv->cmd[i] &= ~MCP48XX_SHDN;
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}
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}
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}
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break;
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/* Command was not recognized */
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default:
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aerr("MCP48XX ERROR: Unrecognized cmd: %d\n", cmd);
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ret = -ENOTTY;
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break;
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}
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return ret;
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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: mcp48xx_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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* spi - SPI driver instance
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* spidev - SPI Chip Select number
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*
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* Returned Value:
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* Valid MCP48XX 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 *mcp48xx_initialize(FAR struct spi_dev_s *spi,
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uint32_t spidev)
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{
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FAR struct mcp48xx_dev_s *priv;
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int i;
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/* Sanity check */
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DEBUGASSERT(spi != NULL);
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/* Initialize the MCP48XX device structure */
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priv = (FAR struct mcp48xx_dev_s *)g_dacdev.ad_priv;
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priv->spi = spi;
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priv->spidev = spidev;
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/* Enable both channels with 1x gain by default */
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for (i = 0; i < MCP48XX_MAX_CHANNELS; i++)
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{
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priv->cmd[i] = MCP48XX_SHDN | MCP48XX_GA;
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}
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return &g_dacdev;
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}
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#endif /* CONFIG_MCP48XX */
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