diff --git a/drivers/dac/CMakeLists.txt b/drivers/dac/CMakeLists.txt index f353b17ae07..d22de0fe6cd 100644 --- a/drivers/dac/CMakeLists.txt +++ b/drivers/dac/CMakeLists.txt @@ -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) diff --git a/drivers/dac/Kconfig b/drivers/dac/Kconfig index 97ec43e40a9..d48fde6d443 100644 --- a/drivers/dac/Kconfig +++ b/drivers/dac/Kconfig @@ -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 diff --git a/drivers/dac/Kconfig.mcp4728 b/drivers/dac/Kconfig.mcp4728 new file mode 100644 index 00000000000..1642a8fcee2 --- /dev/null +++ b/drivers/dac/Kconfig.mcp4728 @@ -0,0 +1,9 @@ +# 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. diff --git a/drivers/dac/dac_mcp4728.c b/drivers/dac/dac_mcp4728.c new file mode 100644 index 00000000000..c1c3d46e8e8 --- /dev/null +++ b/drivers/dac/dac_mcp4728.c @@ -0,0 +1,110 @@ +/* + * Copyright 2021 Grinn + * + * SPDX-License-Identifier: Apache-2.0 + */ + +#define DT_DRV_COMPAT microchip_mcp4728 + +#include +#include +#include +#include + +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); diff --git a/dts/bindings/dac/microchip,mcp4728.yaml b/dts/bindings/dac/microchip,mcp4728.yaml new file mode 100644 index 00000000000..36e410d89d9 --- /dev/null +++ b/dts/bindings/dac/microchip,mcp4728.yaml @@ -0,0 +1,44 @@ +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