115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
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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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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 int mcux_dac_init(const struct device *dev)
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{
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return 0;
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}
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static const struct dac_driver_api 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, mcux_dac_init, 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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