108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/*
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* Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
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* Copyright (c) 2023, NXP
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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_lpdac
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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_lpdac, CONFIG_DAC_LOG_LEVEL);
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struct mcux_lpdac_config {
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LPDAC_Type *base;
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dac_reference_voltage_source_t ref_voltage;
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bool low_power;
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};
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struct mcux_lpdac_data {
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bool configured;
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};
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static int mcux_lpdac_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_lpdac_config *config = dev->config;
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struct mcux_lpdac_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.referenceVoltageSource = config->ref_voltage;
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#if defined(FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL) && FSL_FEATURE_LPDAC_HAS_GCR_BUF_SPD_CTRL
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dac_config.enableLowerLowPowerMode = config->low_power;
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#else
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dac_config.enableLowPowerMode = config->low_power;
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#endif
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DAC_Init(config->base, &dac_config);
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DAC_Enable(config->base, false);
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data->configured = true;
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return 0;
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}
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static int mcux_lpdac_write_value(const struct device *dev, uint8_t channel, uint32_t value)
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{
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const struct mcux_lpdac_config *config = dev->config;
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struct mcux_lpdac_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("unsupported value %d", value);
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return -EINVAL;
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}
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DAC_Enable(config->base, true);
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DAC_SetData(config->base, value);
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return 0;
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}
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static int mcux_lpdac_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_lpdac_driver_api = {
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.channel_setup = mcux_lpdac_channel_setup,
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.write_value = mcux_lpdac_write_value,
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};
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#define MCUX_LPDAC_INIT(n) \
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static struct mcux_lpdac_data mcux_lpdac_data_##n; \
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\
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static const struct mcux_lpdac_config mcux_lpdac_config_##n = { \
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.base = (LPDAC_Type *)DT_INST_REG_ADDR(n), \
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.ref_voltage = 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_lpdac_init, NULL, &mcux_lpdac_data_##n, \
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&mcux_lpdac_config_##n, POST_KERNEL, CONFIG_DAC_INIT_PRIORITY, \
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&mcux_lpdac_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(MCUX_LPDAC_INIT)
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