drivers: dac: add mcp4728 driver (6505cbc0) · Commits · Wenxi XU / zephyr

drivers/dac/CMakeLists.txt

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		@@ -11,5 +11,6 @@ zephyr_library_sources_ifdef(CONFIG_DAC_DACX0508 dac_dacx0508.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_DACX3608 dac_dacx3608.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_SHELL dac_shell.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_MCP4725 dac_mcp4725.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_MCP4728 dac_mcp4728.c)
		zephyr_library_sources_ifdef(CONFIG_DAC_GD32 dac_gd32.c)
		zephyr_library_sources_ifdef(CONFIG_USERSPACE dac_handlers.c)

drivers/dac/Kconfig

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		@@ -44,6 +44,8 @@ source "drivers/dac/Kconfig.dacx3608"

		source "drivers/dac/Kconfig.mcp4725"

		source "drivers/dac/Kconfig.mcp4728"

		source "drivers/dac/Kconfig.gd32"

		endif # DAC

drivers/dac/Kconfig.mcp4728

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		# Copyright 2021 Grinn
		#
		# SPDX-License-Identifier: Apache-2.0

		config DAC_MCP4728
		bool "Microchip MCP4728 DAC driver"
		depends on I2C && DAC
		help
		Enable driver for the Microchip MCP4728.

drivers/dac/dac_mcp4728.c

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		/*
		* Copyright 2021 Grinn
		*
		* SPDX-License-Identifier: Apache-2.0
		*/

		#define DT_DRV_COMPAT microchip_mcp4728

		#include <zephyr.h>
		#include <drivers/dac.h>
		#include <drivers/i2c.h>
		#include <logging/log.h>

		LOG_MODULE_REGISTER(dac_mcp4728, CONFIG_DAC_LOG_LEVEL);

		#define MCP4728_MAX_CHANNEL 4U
		#define MCP4728_RESOLUTION 0xC
		#define MCP4728_DAC_MAX_VAL ((1U << MCP4728_RESOLUTION) - 1U)
		#define MCP4728_MULTI_WRITE_CMD_VAL 8U
		#define MCP4728_MULTI_WRITE_CMD_POS 3U
		#define MCP4728_MULTI_WRITE_CHANNEL_POS 1U
		#define MCP4728_MULTI_WRITE_REFERENCE_POS 7U
		#define MCP4728_MULTI_WRITE_POWER_DOWN_POS 5U
		#define MCP4728_MULTI_WRITE_POWER_DOWN_MASK 0X3
		#define MCP4728_MULTI_WRITE_GAIN_POS 4U
		#define MCP4728_MULTI_WRITE_DAC_UPPER_VAL_POS 8U
		#define MCP4728_MULTI_WRITE_DAC_UPPER_VAL_MASK 0xF
		#define MCP4728_MULTI_WRITE_DAC_LOWER_VAL_MASK 0xFF

		struct mcp4728_config {
		struct i2c_dt_spec bus;
		uint8_t power_down[MCP4728_MAX_CHANNEL];
		uint8_t voltage_reference[MCP4728_MAX_CHANNEL];
		uint8_t gain[MCP4728_MAX_CHANNEL];
		};

		static int mcp4728_channel_setup(const struct device *dev,
		const struct dac_channel_cfg *channel_cfg)
		{
		if (channel_cfg->channel_id >= MCP4728_MAX_CHANNEL) {
		return -ENOTSUP;
		}

		if (channel_cfg->resolution != MCP4728_RESOLUTION) {
		return -ENOTSUP;
		}

		return 0;
		}

		static int mcp4728_write_value(const struct device *dev, uint8_t channel, uint32_t value)
		{
		const struct mcp4728_config config = (struct mcp4728_config )dev->config;
		uint8_t tx_data[3];
		int ret;

		if (channel >= MCP4728_MAX_CHANNEL) {
		return -ENOTSUP;
		}

		if (value > MCP4728_DAC_MAX_VAL) {
		return -ENOTSUP;
		}

		/* Multi-Write Command: Write Multiple DAC Input Registers. */
		tx_data[0] = (MCP4728_MULTI_WRITE_CMD_VAL << MCP4728_MULTI_WRITE_CMD_POS) \|
		(channel << MCP4728_MULTI_WRITE_CHANNEL_POS);
		tx_data[1] = (config->voltage_reference[channel] << MCP4728_MULTI_WRITE_REFERENCE_POS) \|
		((config->power_down[channel] & MCP4728_MULTI_WRITE_POWER_DOWN_MASK)
		<< MCP4728_MULTI_WRITE_POWER_DOWN_POS) \|
		((config->gain[channel] << MCP4728_MULTI_WRITE_GAIN_POS)) \|
		((value >> MCP4728_MULTI_WRITE_DAC_UPPER_VAL_POS) &
		MCP4728_MULTI_WRITE_DAC_UPPER_VAL_MASK);
		tx_data[2] = (value & MCP4728_MULTI_WRITE_DAC_LOWER_VAL_MASK);
		ret = i2c_write_dt(&config->bus, tx_data, sizeof(tx_data));

		return ret;
		}

		static int dac_mcp4728_init(const struct device *dev)
		{
		const struct mcp4728_config *config = dev->config;

		if (!device_is_ready(config->bus.bus)) {
		LOG_ERR("%s device not found", config->bus.bus->name);
		return -ENODEV;
		}
		return 0;
		}

		static const struct dac_driver_api mcp4728_driver_api = {
		.channel_setup = mcp4728_channel_setup,
		.write_value = mcp4728_write_value,
		};

		#define INST_DT_MCP4728(index) \
		static const struct mcp4728_config mcp4728_config_##index = { \
		.bus = I2C_DT_SPEC_INST_GET(index), \
		.power_down = DT_INST_PROP(index, power_down_mode), \
		.voltage_reference = DT_INST_PROP(index, voltage_reference), \
		.gain = DT_INST_PROP_OR(index, gain, {0}), \
		}; \
		\
		DEVICE_DT_INST_DEFINE(index, dac_mcp4728_init, NULL, NULL, \
		&mcp4728_config_##index, \
		POST_KERNEL, \
		CONFIG_DAC_INIT_PRIORITY, \
		&mcp4728_driver_api);

		DT_INST_FOREACH_STATUS_OKAY(INST_DT_MCP4728);

dts/bindings/dac/microchip,mcp4728.yaml

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		description: Microchip MCP4728 12-bit 4-channel DAC

		compatible: "microchip,mcp4728"

		include: [dac-controller.yaml, i2c-device.yaml]

		properties:
		"#io-channel-cells":
		const: 1

		voltage_reference:
		type: array
		required: true
		description: \|
		DAC voltage reference select.
		0 - Vdd
		1 - Internal voltage reference (2.048V)
		Note: array entries correspond to the successive channels

		power_down_mode:
		type: array
		required: true
		description: \|
		Power-down mode select.
		0 - normal mode
		1 - Vout is loaded with 1 kOhm resistor to ground
		2 - Vout is loaded 100 kOhm resistor to ground
		3 - Vout is loaded with 500 kOhm resistor to ground
		Note: with values bigger than 0 most of channel circuits are powered off
		Note: array entries correspond to the successive channels

		gain:
		type: array
		required: false
		default: [0, 0, 0, 0]
		description: \|
		Gain selection bit.
		0 = x1 (gain of 1)
		1 = x2 (gain of 2)
		Note: applicable only when internal Vref is selected
		Note: array entries correspond to the successive channels

		io-channel-cells:
		- output

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