blob: bb167fa71c06967172e7bd446f666d05d6dc02ae [file] [log] [blame]
/*
* Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_kinetis_dac
#include <zephyr/kernel.h>
#include <zephyr/drivers/dac.h>
#include <zephyr/logging/log.h>
#include <fsl_dac.h>
LOG_MODULE_REGISTER(dac_mcux_dac, CONFIG_DAC_LOG_LEVEL);
struct mcux_dac_config {
DAC_Type *base;
dac_reference_voltage_source_t reference;
bool low_power;
};
struct mcux_dac_data {
bool configured;
};
static int mcux_dac_channel_setup(const struct device *dev,
const struct dac_channel_cfg *channel_cfg)
{
const struct mcux_dac_config *config = dev->config;
struct mcux_dac_data *data = dev->data;
dac_config_t dac_config;
if (channel_cfg->channel_id != 0) {
LOG_ERR("unsupported channel %d", channel_cfg->channel_id);
return -ENOTSUP;
}
if (channel_cfg->resolution != 12) {
LOG_ERR("unsupported resolution %d", channel_cfg->resolution);
return -ENOTSUP;
}
DAC_GetDefaultConfig(&dac_config);
dac_config.enableLowPowerMode = config->low_power;
dac_config.referenceVoltageSource = config->reference;
DAC_Init(config->base, &dac_config);
data->configured = true;
return 0;
}
static int mcux_dac_write_value(const struct device *dev, uint8_t channel,
uint32_t value)
{
const struct mcux_dac_config *config = dev->config;
struct mcux_dac_data *data = dev->data;
if (!data->configured) {
LOG_ERR("channel not initialized");
return -EINVAL;
}
if (channel != 0) {
LOG_ERR("unsupported channel %d", channel);
return -ENOTSUP;
}
if (value >= 4096) {
LOG_ERR("value %d out of range", value);
return -EINVAL;
}
/* Static operation */
DAC_EnableBuffer(config->base, false);
DAC_SetBufferValue(config->base, 0, value);
DAC_Enable(config->base, true);
return 0;
}
static const struct dac_driver_api mcux_dac_driver_api = {
.channel_setup = mcux_dac_channel_setup,
.write_value = mcux_dac_write_value,
};
#define TO_DAC_VREF_SRC(val) \
_DO_CONCAT(kDAC_ReferenceVoltageSourceVref, val)
#define MCUX_DAC_INIT(n) \
static struct mcux_dac_data mcux_dac_data_##n; \
\
static const struct mcux_dac_config mcux_dac_config_##n = { \
.base = (DAC_Type *)DT_INST_REG_ADDR(n), \
.reference = \
TO_DAC_VREF_SRC(DT_INST_PROP(n, voltage_reference)), \
.low_power = DT_INST_PROP(n, low_power_mode), \
}; \
\
DEVICE_DT_INST_DEFINE(n, NULL, NULL, \
&mcux_dac_data_##n, \
&mcux_dac_config_##n, \
POST_KERNEL, CONFIG_DAC_INIT_PRIORITY, \
&mcux_dac_driver_api);
DT_INST_FOREACH_STATUS_OKAY(MCUX_DAC_INIT)