115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT nxp_kinetis_dac
|
|
|
|
#include <zephyr.h>
|
|
#include <drivers/dac.h>
|
|
#include <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 int mcux_dac_init(const struct device *dev)
|
|
{
|
|
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, mcux_dac_init, 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)
|