blob: a993145655e4e790b0375470ae6005ead3dd28fe [file] [log] [blame]
/*
* Copyright (c) 2020 Libre Solar Technologies GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT st_stm32_dac
#include <errno.h>
#include <zephyr/drivers/dac.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/device.h>
#include <zephyr/kernel.h>
#include <zephyr/init.h>
#include <soc.h>
#include <stm32_ll_dac.h>
#define LOG_LEVEL CONFIG_DAC_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(dac_stm32);
#include <zephyr/drivers/clock_control/stm32_clock_control.h>
/* some low-end MCUs have DAC with only one channel */
#ifdef LL_DAC_CHANNEL_2
#define STM32_CHANNEL_COUNT 2
#else
#define STM32_CHANNEL_COUNT 1
#endif
/* first channel always named 1 */
#define STM32_FIRST_CHANNEL 1
#define CHAN(n) LL_DAC_CHANNEL_##n
static const uint32_t table_channels[] = {
CHAN(1),
#ifdef LL_DAC_CHANNEL_2
CHAN(2),
#endif
};
/* Read-only driver configuration */
struct dac_stm32_cfg {
/* DAC instance. */
DAC_TypeDef *base;
/* Clock configuration. */
struct stm32_pclken pclken;
/* pinctrl configurations. */
const struct pinctrl_dev_config *pcfg;
};
/* Runtime driver data */
struct dac_stm32_data {
uint8_t channel_count;
uint8_t resolution;
};
static int dac_stm32_write_value(const struct device *dev,
uint8_t channel, uint32_t value)
{
struct dac_stm32_data *data = dev->data;
const struct dac_stm32_cfg *cfg = dev->config;
if (channel - STM32_FIRST_CHANNEL >= data->channel_count ||
channel < STM32_FIRST_CHANNEL) {
LOG_ERR("Channel %d is not valid", channel);
return -EINVAL;
}
if (value >= BIT(data->resolution)) {
LOG_ERR("Value %d is out of range", value);
return -EINVAL;
}
if (data->resolution == 8) {
LL_DAC_ConvertData8RightAligned(cfg->base,
table_channels[channel - STM32_FIRST_CHANNEL], value);
} else if (data->resolution == 12) {
LL_DAC_ConvertData12RightAligned(cfg->base,
table_channels[channel - STM32_FIRST_CHANNEL], value);
}
return 0;
}
static int dac_stm32_channel_setup(const struct device *dev,
const struct dac_channel_cfg *channel_cfg)
{
struct dac_stm32_data *data = dev->data;
const struct dac_stm32_cfg *cfg = dev->config;
uint32_t output_buffer;
if ((channel_cfg->channel_id - STM32_FIRST_CHANNEL >=
data->channel_count) ||
(channel_cfg->channel_id < STM32_FIRST_CHANNEL)) {
LOG_ERR("Channel %d is not valid", channel_cfg->channel_id);
return -EINVAL;
}
if ((channel_cfg->resolution == 8) ||
(channel_cfg->resolution == 12)) {
data->resolution = channel_cfg->resolution;
} else {
LOG_ERR("Resolution not supported");
return -ENOTSUP;
}
if (channel_cfg->buffered) {
output_buffer = LL_DAC_OUTPUT_BUFFER_ENABLE;
} else {
output_buffer = LL_DAC_OUTPUT_BUFFER_DISABLE;
}
LL_DAC_SetOutputBuffer(cfg->base,
table_channels[channel_cfg->channel_id - STM32_FIRST_CHANNEL],
output_buffer);
LL_DAC_Enable(cfg->base,
table_channels[channel_cfg->channel_id - STM32_FIRST_CHANNEL]);
LOG_DBG("Channel setup succeeded!");
return 0;
}
static int dac_stm32_init(const struct device *dev)
{
const struct dac_stm32_cfg *cfg = dev->config;
int err;
/* enable clock for subsystem */
const struct device *const clk = DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE);
if (!device_is_ready(clk)) {
LOG_ERR("clock control device not ready");
return -ENODEV;
}
if (clock_control_on(clk,
(clock_control_subsys_t) &cfg->pclken) != 0) {
return -EIO;
}
/* Configure dt provided device signals when available */
err = pinctrl_apply_state(cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (err < 0) {
LOG_ERR("DAC pinctrl setup failed (%d)", err);
return err;
}
return 0;
}
static const struct dac_driver_api api_stm32_driver_api = {
.channel_setup = dac_stm32_channel_setup,
.write_value = dac_stm32_write_value
};
#define STM32_DAC_INIT(index) \
\
PINCTRL_DT_INST_DEFINE(index); \
\
static const struct dac_stm32_cfg dac_stm32_cfg_##index = { \
.base = (DAC_TypeDef *)DT_INST_REG_ADDR(index), \
.pclken = { \
.enr = DT_INST_CLOCKS_CELL(index, bits), \
.bus = DT_INST_CLOCKS_CELL(index, bus), \
}, \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(index), \
}; \
\
static struct dac_stm32_data dac_stm32_data_##index = { \
.channel_count = STM32_CHANNEL_COUNT \
}; \
\
DEVICE_DT_INST_DEFINE(index, &dac_stm32_init, NULL, \
&dac_stm32_data_##index, \
&dac_stm32_cfg_##index, POST_KERNEL, \
CONFIG_DAC_INIT_PRIORITY, \
&api_stm32_driver_api);
DT_INST_FOREACH_STATUS_OKAY(STM32_DAC_INIT)