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Jeppe Odgaardcfriedt
Jeppe Odgaard
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cfriedt
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drivers: sensor: omron: add d6f driver
Add support for Omron D6F mass flow rate sensor series. The sensor series outputs an analogue voltage which is read using an ADC. Signed-off-by: Jeppe Odgaard <[email protected]>
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‎drivers/sensor/CMakeLists.txt‎

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@@ -22,6 +22,7 @@ add_subdirectory(microchip)
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add_subdirectory(nordic)
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add_subdirectory(nuvoton)
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add_subdirectory(nxp)
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add_subdirectory(omron)
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add_subdirectory(pixart)
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add_subdirectory(pni)
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add_subdirectory(realtek)

‎drivers/sensor/Kconfig‎

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@@ -108,6 +108,7 @@ source "drivers/sensor/microchip/Kconfig"
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source "drivers/sensor/nordic/Kconfig"
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source "drivers/sensor/nuvoton/Kconfig"
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source "drivers/sensor/nxp/Kconfig"
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source "drivers/sensor/omron/Kconfig"
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source "drivers/sensor/pixart/Kconfig"
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source "drivers/sensor/pni/Kconfig"
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source "drivers/sensor/realtek/Kconfig"

‎drivers/sensor/omron/CMakeLists.txt‎

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# Copyright (c) 2025 Prevas A/S
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# SPDX-License-Identifier: Apache-2.0
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# zephyr-keep-sorted-start
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add_subdirectory_ifdef(CONFIG_D6F d6f)
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# zephyr-keep-sorted-stop

‎drivers/sensor/omron/Kconfig‎

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# Copyright (c) 2025 Prevas A/S
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# SPDX-License-Identifier: Apache-2.0
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# zephyr-keep-sorted-start
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source "drivers/sensor/omron/d6f/Kconfig"
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# zephyr-keep-sorted-stop

‎drivers/sensor/omron/d6f/CMakeLists.txt‎

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# Copyright (c) 2025 Prevas A/S
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# SPDX-License-Identifier: Apache-2.0
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zephyr_library()
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zephyr_library_sources(d6f.c)

‎drivers/sensor/omron/d6f/Kconfig‎

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# Copyright (c) 2025 Prevas A/S
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# SPDX-License-Identifier: Apache-2.0
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config D6F
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bool "D6F mass flow rate sensor"
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default y
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depends on DT_HAS_OMRON_D6F_P0001_ENABLED || DT_HAS_OMRON_D6F_P0010_ENABLED
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select ADC
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select FPU if CPU_HAS_FPU
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help
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Enable Omron D6F mass flow rate sensor driver. The sensor series
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outputs an analogue voltage which is read using an ADC.

‎drivers/sensor/omron/d6f/d6f.c‎

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/*
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* Copyright (c) 2025 Prevas A/S
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <math.h>
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#include <stdint.h>
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#include <zephyr/drivers/adc.h>
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#include <zephyr/drivers/sensor.h>
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#include <zephyr/device.h>
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#include <zephyr/devicetree.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(d6f, CONFIG_SENSOR_LOG_LEVEL);
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struct d6f_config {
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const struct adc_dt_spec *adc;
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struct adc_sequence sequence;
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const float *polynomial_coefficients;
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uint8_t polynomial_degree;
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};
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struct d6f_data {
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uint32_t adc_sample;
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};
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static int d6f_sample_fetch(const struct device *dev, enum sensor_channel chan)
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{
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const struct d6f_config *config = dev->config;
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switch (chan) {
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case SENSOR_CHAN_ALL:
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case SENSOR_CHAN_FLOW_RATE:
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return adc_read_dt(config->adc, &config->sequence);
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default:
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return -ENOTSUP;
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}
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}
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static int d6f_flow_rate(const struct d6f_config *config, struct d6f_data *data,
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struct sensor_value *val)
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{
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float flow_rate = config->polynomial_coefficients[0];
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int32_t uv = data->adc_sample;
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float v;
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int rc;
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rc = adc_raw_to_microvolts_dt(config->adc, &uv);
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if (rc != 0) {
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return rc;
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}
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v = uv / 1000000.f;
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for (uint8_t i = 1; i <= config->polynomial_degree; ++i) {
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flow_rate += config->polynomial_coefficients[i] * powf(v, i);
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}
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rc = sensor_value_from_float(val, flow_rate);
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if (rc != 0) {
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return rc;
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}
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return 0;
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}
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static int d6f_channel_get(const struct device *dev, enum sensor_channel chan,
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struct sensor_value *val)
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{
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const struct d6f_config *config = dev->config;
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struct d6f_data *data = dev->data;
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switch (chan) {
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case SENSOR_CHAN_FLOW_RATE:
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return d6f_flow_rate(config, data, val);
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default:
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return -ENOTSUP;
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}
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return 0;
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}
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static int d6f_init(const struct device *dev)
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{
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const struct d6f_config *config = dev->config;
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int rc;
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LOG_DBG("Initializing %s", dev->name);
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if (!adc_is_ready_dt(config->adc)) {
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LOG_ERR("%s not ready", dev->name);
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return -ENODEV;
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}
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rc = adc_channel_setup_dt(config->adc);
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if (rc != 0) {
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LOG_ERR("%s setup failed: %d", config->adc->dev->name, rc);
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return -ENODEV;
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}
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return 0;
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}
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static DEVICE_API(sensor, d6f_driver_api) = {
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.sample_fetch = d6f_sample_fetch,
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.channel_get = d6f_channel_get,
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};
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#define D6F_INIT(n, c, p) \
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static struct d6f_data d6f_data_##c##_##n; \
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static const struct adc_dt_spec d6f_adc_##c##_##n = ADC_DT_SPEC_INST_GET(n); \
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static const struct d6f_config d6f_config_##c##_##n = { \
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.adc = &d6f_adc_##c##_##n, \
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.sequence = \
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{ \
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.options = NULL, \
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.channels = BIT(d6f_adc_##c##_##n.channel_id), \
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.buffer = &d6f_data_##c##_##n.adc_sample, \
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.buffer_size = sizeof(d6f_data_##c##_##n.adc_sample), \
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.resolution = d6f_adc_##c##_##n.resolution, \
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.oversampling = d6f_adc_##c##_##n.oversampling, \
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.calibrate = false, \
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}, \
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.polynomial_coefficients = (p), \
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.polynomial_degree = (ARRAY_SIZE(p) - 1), \
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}; \
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\
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SENSOR_DEVICE_DT_INST_DEFINE(n, d6f_init, NULL, &d6f_data_##c##_##n, \
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&d6f_config_##c##_##n, POST_KERNEL, \
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CONFIG_SENSOR_INIT_PRIORITY, &d6f_driver_api);
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#undef DT_DRV_COMPAT
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#define DT_DRV_COMPAT omron_d6f_p0001
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static __maybe_unused const float d6f_p0001_polynomial_coefficients[] = {-0.024864, 0.049944};
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DT_INST_FOREACH_STATUS_OKAY_VARGS(D6F_INIT, DT_DRV_COMPAT, d6f_p0001_polynomial_coefficients)
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#undef DT_DRV_COMPAT
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#define DT_DRV_COMPAT omron_d6f_p0010
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static __maybe_unused const float d6f_p0010_polynomial_coefficients[] = {
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-0.269996, 1.060657, -1.601495, 1.374705, 1.374705, -0.564312, 0.094003};
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DT_INST_FOREACH_STATUS_OKAY_VARGS(D6F_INIT, DT_DRV_COMPAT, d6f_p0010_polynomial_coefficients)

‎dts/bindings/sensor/omron,d6f-analog.yaml‎

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# Copyright (c) 2025, Prevas A/S
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# SPDX-License-Identifier: Apache-2.0
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title: Omron D6F mass flow rate sensor.
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include: sensor-device.yaml
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properties:
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io-channels:
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type: phandle-array
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required: true
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description: |
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ADC used to measure the mass flow rate:
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<&adc_node channel>

‎dts/bindings/sensor/omron,d6f-p0001.yaml‎

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# Copyright (c) 2025, Prevas A/S
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# SPDX-License-Identifier: Apache-2.0
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title: Omron D6F-P0001A1 0.1 L/min flow rate sensor.
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compatible: "omron,d6f-p0001"
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include: omron,d6f-analog.yaml

‎dts/bindings/sensor/omron,d6f-p0010.yaml‎

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# Copyright (c) 2025, Prevas A/S
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# SPDX-License-Identifier: Apache-2.0
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title: Omron D6F-P0010 1 L/min flow rate sensor.
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compatible: "omron,d6f-p0010"
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include: omron,d6f-analog.yaml

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