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114 lines
2.6 KiB
114 lines
2.6 KiB
/* |
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* Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk> |
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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 nxp_kinetis_dac |
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#include <zephyr/kernel.h> |
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#include <zephyr/drivers/dac.h> |
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#include <zephyr/logging/log.h> |
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#include <fsl_dac.h> |
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LOG_MODULE_REGISTER(dac_mcux_dac, CONFIG_DAC_LOG_LEVEL); |
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struct mcux_dac_config { |
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DAC_Type *base; |
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dac_reference_voltage_source_t reference; |
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bool low_power; |
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}; |
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struct mcux_dac_data { |
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bool configured; |
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}; |
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static int mcux_dac_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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const struct mcux_dac_config *config = dev->config; |
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struct mcux_dac_data *data = dev->data; |
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dac_config_t dac_config; |
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if (channel_cfg->channel_id != 0) { |
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LOG_ERR("unsupported channel %d", channel_cfg->channel_id); |
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return -ENOTSUP; |
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} |
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if (channel_cfg->resolution != 12) { |
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LOG_ERR("unsupported resolution %d", channel_cfg->resolution); |
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return -ENOTSUP; |
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} |
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if (channel_cfg->internal) { |
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LOG_ERR("Internal channels not supported"); |
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return -ENOTSUP; |
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} |
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DAC_GetDefaultConfig(&dac_config); |
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dac_config.enableLowPowerMode = config->low_power; |
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dac_config.referenceVoltageSource = config->reference; |
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DAC_Init(config->base, &dac_config); |
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data->configured = true; |
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return 0; |
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} |
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static int mcux_dac_write_value(const struct device *dev, uint8_t channel, |
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uint32_t value) |
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{ |
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const struct mcux_dac_config *config = dev->config; |
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struct mcux_dac_data *data = dev->data; |
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if (!data->configured) { |
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LOG_ERR("channel not initialized"); |
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return -EINVAL; |
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} |
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if (channel != 0) { |
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LOG_ERR("unsupported channel %d", channel); |
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return -ENOTSUP; |
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} |
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if (value >= 4096) { |
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LOG_ERR("value %d out of range", value); |
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return -EINVAL; |
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} |
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/* Static operation */ |
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DAC_EnableBuffer(config->base, false); |
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DAC_SetBufferValue(config->base, 0, value); |
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DAC_Enable(config->base, true); |
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return 0; |
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} |
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static DEVICE_API(dac, mcux_dac_driver_api) = { |
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.channel_setup = mcux_dac_channel_setup, |
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.write_value = mcux_dac_write_value, |
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}; |
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#define TO_DAC_VREF_SRC(val) \ |
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_DO_CONCAT(kDAC_ReferenceVoltageSourceVref, val) |
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#define MCUX_DAC_INIT(n) \ |
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static struct mcux_dac_data mcux_dac_data_##n; \ |
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\ |
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static const struct mcux_dac_config mcux_dac_config_##n = { \ |
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.base = (DAC_Type *)DT_INST_REG_ADDR(n), \ |
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.reference = \ |
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TO_DAC_VREF_SRC(DT_INST_PROP(n, voltage_reference)), \ |
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.low_power = DT_INST_PROP(n, low_power_mode), \ |
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}; \ |
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\ |
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DEVICE_DT_INST_DEFINE(n, NULL, NULL, \ |
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&mcux_dac_data_##n, \ |
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&mcux_dac_config_##n, \ |
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POST_KERNEL, CONFIG_DAC_INIT_PRIORITY, \ |
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&mcux_dac_driver_api); |
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DT_INST_FOREACH_STATUS_OKAY(MCUX_DAC_INIT)
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