111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/*
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* Copyright 2021 Grinn
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT microchip_mcp4728
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#include <zephyr.h>
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#include <drivers/dac.h>
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#include <drivers/i2c.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(dac_mcp4728, CONFIG_DAC_LOG_LEVEL);
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#define MCP4728_MAX_CHANNEL 4U
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#define MCP4728_RESOLUTION 0xC
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#define MCP4728_DAC_MAX_VAL ((1U << MCP4728_RESOLUTION) - 1U)
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#define MCP4728_MULTI_WRITE_CMD_VAL 8U
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#define MCP4728_MULTI_WRITE_CMD_POS 3U
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#define MCP4728_MULTI_WRITE_CHANNEL_POS 1U
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#define MCP4728_MULTI_WRITE_REFERENCE_POS 7U
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#define MCP4728_MULTI_WRITE_POWER_DOWN_POS 5U
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#define MCP4728_MULTI_WRITE_POWER_DOWN_MASK 0X3
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#define MCP4728_MULTI_WRITE_GAIN_POS 4U
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#define MCP4728_MULTI_WRITE_DAC_UPPER_VAL_POS 8U
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#define MCP4728_MULTI_WRITE_DAC_UPPER_VAL_MASK 0xF
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#define MCP4728_MULTI_WRITE_DAC_LOWER_VAL_MASK 0xFF
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struct mcp4728_config {
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struct i2c_dt_spec bus;
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uint8_t power_down[MCP4728_MAX_CHANNEL];
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uint8_t voltage_reference[MCP4728_MAX_CHANNEL];
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uint8_t gain[MCP4728_MAX_CHANNEL];
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};
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static int mcp4728_channel_setup(const struct device *dev,
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const struct dac_channel_cfg *channel_cfg)
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{
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if (channel_cfg->channel_id >= MCP4728_MAX_CHANNEL) {
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return -ENOTSUP;
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}
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if (channel_cfg->resolution != MCP4728_RESOLUTION) {
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return -ENOTSUP;
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}
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return 0;
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}
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static int mcp4728_write_value(const struct device *dev, uint8_t channel, uint32_t value)
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{
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const struct mcp4728_config *config = (struct mcp4728_config *)dev->config;
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uint8_t tx_data[3];
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int ret;
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if (channel >= MCP4728_MAX_CHANNEL) {
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return -ENOTSUP;
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}
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if (value > MCP4728_DAC_MAX_VAL) {
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return -ENOTSUP;
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}
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/* Multi-Write Command: Write Multiple DAC Input Registers. */
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tx_data[0] = (MCP4728_MULTI_WRITE_CMD_VAL << MCP4728_MULTI_WRITE_CMD_POS) |
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(channel << MCP4728_MULTI_WRITE_CHANNEL_POS);
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tx_data[1] = (config->voltage_reference[channel] << MCP4728_MULTI_WRITE_REFERENCE_POS) |
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((config->power_down[channel] & MCP4728_MULTI_WRITE_POWER_DOWN_MASK)
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<< MCP4728_MULTI_WRITE_POWER_DOWN_POS) |
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((config->gain[channel] << MCP4728_MULTI_WRITE_GAIN_POS)) |
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((value >> MCP4728_MULTI_WRITE_DAC_UPPER_VAL_POS) &
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MCP4728_MULTI_WRITE_DAC_UPPER_VAL_MASK);
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tx_data[2] = (value & MCP4728_MULTI_WRITE_DAC_LOWER_VAL_MASK);
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ret = i2c_write_dt(&config->bus, tx_data, sizeof(tx_data));
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return ret;
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}
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static int dac_mcp4728_init(const struct device *dev)
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{
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const struct mcp4728_config *config = dev->config;
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if (!device_is_ready(config->bus.bus)) {
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LOG_ERR("%s device not found", config->bus.bus->name);
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return -ENODEV;
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}
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return 0;
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}
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static const struct dac_driver_api mcp4728_driver_api = {
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.channel_setup = mcp4728_channel_setup,
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.write_value = mcp4728_write_value,
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};
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#define INST_DT_MCP4728(index) \
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static const struct mcp4728_config mcp4728_config_##index = { \
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.bus = I2C_DT_SPEC_INST_GET(index), \
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.power_down = DT_INST_PROP(index, power_down_mode), \
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.voltage_reference = DT_INST_PROP(index, voltage_reference), \
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.gain = DT_INST_PROP_OR(index, gain, {0}), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(index, dac_mcp4728_init, NULL, NULL, \
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&mcp4728_config_##index, \
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POST_KERNEL, \
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CONFIG_DAC_INIT_PRIORITY, \
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&mcp4728_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(INST_DT_MCP4728);
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