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drivers/analog/mcp47x6: Add support for MCP47X6 DAC series
The MCP47X6 series consists of the following single channel DAC chips: - MCP4706 (8 bit) - MCP4716 (10 bit) - MCP4726 (12 bit) The driver supports the following configurations: - gain - power down - voltage reference Persistent configuration storage in the internal EEPROM is not implemented.
This commit is contained in:
Lars Kruse
committed by
Alan C. Assis
Alan C. Assis
parent
33a6e70077
commit
9b3914b740
@@ -0,0 +1,52 @@
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===========================
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Microchip MCP4706/4716/4726
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===========================
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Microchip MCP4706/4716/4726 DAC.
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The digital-analog-converter operates over I2C.
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- ``include/nuttx/analog/mcp47x6.h``. All structures and APIs needed
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to work with DAC drivers are provided in this header file.
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The following features are configurable via the ``ioctl`` interface of
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the device:
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- gain
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- power down
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- voltage reference
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Usage Example
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-------------
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.. code-block:: c
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#include <nuttx/analog/dac.h>
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#include <nuttx/analog/mcp47x6.h>
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struct dac_dev_s *dac;
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unsigned int const i2c_bus = 0;
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unsigned int const i2c_address = 0x63;
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/* create and register device */
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dac = mcp47x6_initialize(i2c_bus, i2c_address);
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dac_register("/dev/dac0", dac);
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/* configure the DAC */
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int fd = open("/dev/dac0", O_WRONLY | O_NONBLOCK);
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ioctl(fd, ANIOC_MCP47X6_DAC_SET_REFERENCE, MCP47X6_REFERENCE_VREF_BUFFERED);
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/* set DAC output value */
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struct dac_msg_s dac_message = {
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.am_channel = 0,
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.am_data = 1234
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};
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write(fd, &dac_message, sizeof(dac_message));
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/* clean up */
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close(fd);
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@@ -40,6 +40,10 @@ if(CONFIG_DAC)
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list(APPEND SRCS dac7554.c)
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endif()
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if(CONFIG_MCP47X6)
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list(APPEND SRCS mcp47x6.c)
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endif()
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if(CONFIG_MCP48XX)
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list(APPEND SRCS mcp48xx.c)
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endif()
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@@ -411,6 +411,34 @@ config DAC7554
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---help---
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Enable driver support for the Texas Instruments DAC7554 dac.
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config MCP47X6
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bool "MCP4706/4716/4726 support"
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default n
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select I2C
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---help---
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Enable driver support for the Microchip MCP4706/4716/4726 DAC.
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choice
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prompt "MCP47X6 variant"
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default MCP4706
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depends on MCP47X6
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config MCP4706
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bool "MCP4706 (8-bit) DAC"
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config MCP4716
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bool "MCP4716 (10-bit) DAC"
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config MCP4726
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bool "MCP4726 (12-bit) DAC"
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endchoice # MCP47X6 variant
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config MCP47X6_I2C_FREQUENCY
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int "MCP47X6 I2C frequency"
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default 400000
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depends on MCP47X6
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config MCP48XX
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bool "MCP4802/4812/4822 support"
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default n
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@@ -44,6 +44,10 @@ ifeq ($(CONFIG_DAC7554),y)
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CSRCS += dac7554.c
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endif
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ifeq ($(CONFIG_MCP47X6),y)
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CSRCS += mcp47x6.c
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endif
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ifeq ($(CONFIG_MCP48XX),y)
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CSRCS += mcp48xx.c
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endif
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459
drivers/analog/mcp47x6.c
Normal file
459
drivers/analog/mcp47x6.c
Normal file
@@ -0,0 +1,459 @@
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/****************************************************************************
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* drivers/analog/mcp47x6.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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/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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#include <nuttx/analog/mcp47x6.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_MCP47X6)
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#if defined(CONFIG_MCP4706)
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# define MCP47X6_DATA_BITS 8u
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# define MCP47X6_DATA_SHIFT 0u
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#elif defined(CONFIG_MCP4716)
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# define MCP47X6_DATA_BITS 10u
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# define MCP47X6_DATA_SHIFT 2u
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#elif defined(CONFIG_MCP4726)
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# define MCP47X6_DATA_BITS 12u
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# define MCP47X6_DATA_SHIFT 0u
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#else
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# error MCP47x6 variant selection required
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#endif
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#ifndef CONFIG_MCP47X6_I2C_FREQUENCY
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# define CONFIG_MCP47X6_I2C_FREQUENCY 400000
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#endif
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#define MCP47X6_GAIN_MASK (1u << MCP47X6_GAIN_SHIFT)
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#define MCP47X6_GAIN_SHIFT 0u
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#define MCP47X6_POWER_DOWN_MASK (3u << MCP47X6_POWER_DOWN_SHIFT)
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#define MCP47X6_POWER_DOWN_SHIFT 1u
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#define MCP47X6_REFERENCE_MASK (3u << MCP47X6_REFERENCE_SHIFT)
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#define MCP47X6_REFERENCE_SHIFT 3u
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#define MCP47X6_COMMAND_MASK (7u << MCP47X6_COMMAND_SHIFT)
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#define MCP47X6_COMMAND_SHIFT 5u
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#define MCP47X6_DATA_MASK ((1u << MCP47X6_DATA_BITS) - 1u)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct mcp47x6_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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uint8_t cmd; /* MCP47x6 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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/* DAC methods */
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static void mcp47x6_reset(FAR struct dac_dev_s *dev);
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static int mcp47x6_setup(FAR struct dac_dev_s *dev);
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static void mcp47x6_shutdown(FAR struct dac_dev_s *dev);
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static void mcp47x6_txint(FAR struct dac_dev_s *dev, bool enable);
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static int mcp47x6_send(FAR struct dac_dev_s *dev,
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FAR struct dac_msg_s *msg);
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static int mcp47x6_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 const struct dac_ops_s g_dacops =
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{
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mcp47x6_reset, /* ao_reset */
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mcp47x6_setup, /* ao_setup */
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mcp47x6_shutdown, /* ao_shutdown */
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mcp47x6_txint, /* ao_txint */
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mcp47x6_send, /* ao_send */
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mcp47x6_ioctl /* ao_ioctl */
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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: mcp47x6_i2c_write
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*
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* Description:
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* Send the raw content of a buffer to the DAC.
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*
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****************************************************************************/
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static int mcp47x6_i2c_write(FAR struct mcp47x6_dev_s *priv,
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uint8_t const *source, size_t size)
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{
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struct i2c_msg_s msg;
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int ret;
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/* Sanity check */
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DEBUGASSERT(priv->i2c != NULL);
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/* Setup for the transfer */
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msg.frequency = CONFIG_MCP47X6_I2C_FREQUENCY;
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msg.addr = priv->addr;
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msg.flags = 0;
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msg.buffer = (uint8_t *)source; /* discard const qualifier */
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msg.length = size;
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/* Then perform the transfer. */
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ret = I2C_TRANSFER(priv->i2c, &msg, 1);
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if (ret < 0)
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{
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aerr("MCP47X6 I2C write transfer failed: %d", ret);
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return ret;
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}
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return ret;
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}
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/****************************************************************************
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* Name: mcp47x6_i2c_read
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*
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* Description:
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* Read raw content from the DAC
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*
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* Response bytes:
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* - volatile status and configuration
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* - volatile data byte
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* - volatile data byte (only for MCP4716 and MCP4726)
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* - non-volatile status and configuration
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* - non-volatile data byte
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* - non-volatile data byte (only for MCP4716 and MCP4726)
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*
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****************************************************************************/
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static int mcp47x6_i2c_read(FAR struct mcp47x6_dev_s *priv,
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uint8_t *destination, size_t size)
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{
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struct i2c_msg_s msg;
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int ret;
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/* Sanity check */
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DEBUGASSERT(priv->i2c != NULL);
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/* Setup for the transfer */
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msg.frequency = CONFIG_MCP47X6_I2C_FREQUENCY;
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msg.addr = priv->addr;
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msg.flags = I2C_M_READ;
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msg.buffer = destination;
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msg.length = size;
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/* Then perform the transfer. */
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ret = I2C_TRANSFER(priv->i2c, &msg, 1);
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if (ret < 0)
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{
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aerr("MCP47X6 I2C read transfer failed: %d", ret);
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return ret;
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}
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return ret;
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}
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/****************************************************************************
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* Name: mcp47x6_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 mcp47x6_reset(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: mcp47x6_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 mcp47x6_setup(FAR struct dac_dev_s *dev)
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{
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FAR struct mcp47x6_dev_s *priv = (FAR struct mcp47x6_dev_s *)dev->ad_priv;
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uint8_t response;
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int ret;
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/* Device's default settings after power up. */
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uint8_t default_settings = MCP47X6_REFERENCE_VDD_UNBUFFERED
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| MCP47X6_POWER_DOWN_DISABLED
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| MCP47X6_GAIN_1X;
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/* Retrieve the current device setup. */
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ret = mcp47x6_i2c_read(priv, &response, 1);
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if (ret < 0)
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{
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aerr("MCP47X6 I2C reading initial configuration failed: %d", ret);
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priv->cmd = default_settings;
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return ret;
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}
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/* Store the current setup for future configuration operations. */
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priv->cmd = response & (MCP47X6_REFERENCE_MASK
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| MCP47X6_POWER_DOWN_MASK
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| MCP47X6_GAIN_MASK);
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return OK;
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}
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/****************************************************************************
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* Name: mcp47x6_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 mcp47x6_shutdown(FAR struct dac_dev_s *dev)
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{
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}
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/****************************************************************************
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* Name: mcp47x6_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 mcp47x6_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: mcp47x6_send
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****************************************************************************/
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static int mcp47x6_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
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{
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FAR struct mcp47x6_dev_s *priv = (FAR struct mcp47x6_dev_s *)dev->ad_priv;
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int ret;
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/* Set up message to send */
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ainfo("value: %08x", (unsigned int)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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uint32_t data;
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data = msg->am_data & MCP47X6_DATA_MASK;
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data <<= MCP47X6_DATA_SHIFT;
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buffer[0] = (uint8_t)(data >> 8);
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buffer[1] = (uint8_t)(data);
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ret = mcp47x6_i2c_write(priv, buffer, sizeof(buffer));
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if (ret < 0)
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{
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aerr("ERROR: mcp47x6_send failed: %d", ret);
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}
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dac_txdone(dev);
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return ret;
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}
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/****************************************************************************
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* Name: mcp47x6_ioctl
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****************************************************************************/
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static int mcp47x6_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 mcp47x6_dev_s *priv = (FAR struct mcp47x6_dev_s *)dev->ad_priv;
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int ret = OK;
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bool command_prepared = false;
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switch (cmd)
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{
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case ANIOC_MCP47X6_DAC_SET_GAIN:
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{
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switch (arg)
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{
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case MCP47X6_GAIN_1X:
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case MCP47X6_GAIN_2X:
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priv->cmd &= ~MCP47X6_GAIN_MASK;
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priv->cmd |= arg;
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command_prepared = true;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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}
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break;
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case ANIOC_MCP47X6_DAC_SET_POWER_DOWN:
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{
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switch (arg)
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{
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case MCP47X6_POWER_DOWN_DISABLED:
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case MCP47X6_POWER_DOWN_1K:
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case MCP47X6_POWER_DOWN_100K:
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case MCP47X6_POWER_DOWN_500K:
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priv->cmd &= ~MCP47X6_POWER_DOWN_MASK;
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priv->cmd |= arg;
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command_prepared = true;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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}
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break;
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case ANIOC_MCP47X6_DAC_SET_REFERENCE:
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{
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switch (arg)
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{
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case MCP47X6_REFERENCE_VDD_UNBUFFERED:
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case MCP47X6_REFERENCE_VREF_UNBUFFERED:
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case MCP47X6_REFERENCE_VREF_BUFFERED:
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priv->cmd &= ~MCP47X6_REFERENCE_MASK;
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priv->cmd |= arg;
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command_prepared = true;
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break;
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default:
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ret = -EINVAL;
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break;
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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("MCP47X6 ERROR: Unrecognized cmd: %d", cmd);
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ret = -ENOTTY;
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break;
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}
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|
||||
if (command_prepared)
|
||||
{
|
||||
ret = mcp47x6_i2c_write(priv, &priv->cmd, sizeof(priv->cmd));
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: mcp47x6_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize DAC
|
||||
*
|
||||
* Input Parameters:
|
||||
* i2c - Pointer to a valid I2C master struct.
|
||||
* addr - I2C device address.
|
||||
*
|
||||
* Returned Value:
|
||||
* Valid MCP47X6 device structure reference on success; a NULL on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct dac_dev_s *mcp47x6_initialize(FAR struct i2c_master_s *i2c,
|
||||
uint8_t addr)
|
||||
{
|
||||
FAR struct mcp47x6_dev_s *priv;
|
||||
FAR struct dac_dev_s *dacdev;
|
||||
|
||||
/* Sanity check */
|
||||
|
||||
DEBUGASSERT(i2c != NULL);
|
||||
|
||||
/* Initialize the MCP47X6 device structure */
|
||||
|
||||
priv = kmm_malloc(sizeof(struct mcp47x6_dev_s));
|
||||
if (priv == NULL)
|
||||
{
|
||||
aerr("ERROR: Failed to allocate mcp47x6_dev_s instance\n");
|
||||
free(priv);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
dacdev = kmm_malloc(sizeof(struct dac_dev_s));
|
||||
if (dacdev == NULL)
|
||||
{
|
||||
aerr("ERROR: Failed to allocate dac_dev_s instance\n");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
dacdev->ad_ops = &g_dacops;
|
||||
dacdev->ad_priv = priv;
|
||||
|
||||
priv->i2c = i2c;
|
||||
priv->addr = addr;
|
||||
return dacdev;
|
||||
}
|
||||
|
||||
#endif /* CONFIG_MCP47X6 */
|
||||
@@ -224,6 +224,24 @@ FAR struct dac_dev_s *dac7554_initialize(FAR struct spi_dev_s *spi,
|
||||
FAR struct dac_dev_s *lmp92001_dac_initialize(FAR struct i2c_master_s *i2c,
|
||||
uint8_t addr);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: mcp47x6_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize DAC
|
||||
*
|
||||
* Input Parameters:
|
||||
* I2C Port number
|
||||
* Device address
|
||||
*
|
||||
* Returned Value:
|
||||
* Valid MCP47X6 device structure reference on success; a NULL on failure
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
FAR struct dac_dev_s *mcp47x6_initialize(FAR struct i2c_master_s *i2c,
|
||||
uint8_t addr);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: mcp48xx_initialize
|
||||
*
|
||||
|
||||
@@ -121,6 +121,11 @@
|
||||
#define AN_ADS1115_FIRST (AN_MCP3008_FIRST + AN_MCP3008_NCMDS)
|
||||
#define AN_ADS1115_NCMDS 10
|
||||
|
||||
/* See include/nuttx/analog/mcp47x6.h */
|
||||
|
||||
#define AN_MCP47X6_FIRST (AN_ADS1115_FIRST + AN_ADS1115_NCMDS)
|
||||
#define AN_MCP47X6_NCMDS 3
|
||||
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
81
include/nuttx/analog/mcp47x6.h
Normal file
81
include/nuttx/analog/mcp47x6.h
Normal file
@@ -0,0 +1,81 @@
|
||||
/****************************************************************************
|
||||
* include/nuttx/analog/mcp47x6.h
|
||||
*
|
||||
* SPDX-License-Identifier: Apache-2.0
|
||||
*
|
||||
* Licensed to the Apache Software Foundation (ASF) under one or more
|
||||
* contributor license agreements. See the NOTICE file distributed with
|
||||
* this work for additional information regarding copyright ownership. The
|
||||
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
||||
* "License"); you may not use this file except in compliance with the
|
||||
* License. You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||
* License for the specific language governing permissions and limitations
|
||||
* under the License.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef __INCLUDE_NUTTX_ANALOG_MCP47X6_H
|
||||
#define __INCLUDE_NUTTX_ANALOG_MCP47X6_H
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
#include <nuttx/analog/ioctl.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
/* IOCTL Commands ***********************************************************/
|
||||
|
||||
/* Cmd: ANIOC_MCP47X6_DAC_SET_GAIN Arg: mcp47x6_gain_e value
|
||||
* Cmd: ANIOC_MCP47X6_DAC_SET_POWER_DOWN Arg: mcp47x6_power_down_e value
|
||||
* Cmd: ANIOC_MCP47X6_DAC_SET_REFERENCE Arg: mcp47x6_reference_e value
|
||||
*/
|
||||
|
||||
#define ANIOC_MCP47X6_DAC_SET_GAIN _ANIOC(AN_MCP47X6_FIRST + 0)
|
||||
#define ANIOC_MCP47X6_DAC_SET_POWER_DOWN _ANIOC(AN_MCP47X6_FIRST + 1)
|
||||
#define ANIOC_MCP47X6_DAC_SET_REFERENCE _ANIOC(AN_MCP47X6_FIRST + 2)
|
||||
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
|
||||
enum mcp47x6_command_e
|
||||
{
|
||||
MCP47X6_COMMAND_WRITE_DAC = 0 << 5U,
|
||||
MCP47X6_COMMAND_WRITE_CONFIG = 4 << 5U,
|
||||
};
|
||||
|
||||
enum mcp47x6_reference_e
|
||||
{
|
||||
MCP47X6_REFERENCE_VDD_UNBUFFERED = 0 << 3U,
|
||||
MCP47X6_REFERENCE_VREF_UNBUFFERED = 2 << 3U,
|
||||
MCP47X6_REFERENCE_VREF_BUFFERED = 3 << 3U,
|
||||
};
|
||||
|
||||
enum mcp47x6_power_down_e
|
||||
{
|
||||
MCP47X6_POWER_DOWN_DISABLED = 0 << 1U,
|
||||
MCP47X6_POWER_DOWN_1K = 1 << 1U,
|
||||
MCP47X6_POWER_DOWN_100K = 2 << 1U,
|
||||
MCP47X6_POWER_DOWN_500K = 3 << 1U,
|
||||
};
|
||||
|
||||
/* MCP47X6_GAIN_2X is ignored for MCP47X6_REFERENCE_VDD_UNBUFFERED */
|
||||
|
||||
enum mcp47x6_gain_e
|
||||
{
|
||||
MCP47X6_GAIN_1X = 0 << 0U,
|
||||
MCP47X6_GAIN_2X = 1 << 0U
|
||||
};
|
||||
|
||||
#endif /* __INCLUDE_NUTTX_ANALOG_MCP47X6_H */
|
||||
Reference in New Issue
Block a user