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Alexander Wachter
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drivers: sensor: ams_iAQcore: Implemented ASM Indoor Air Quality Sensor
Implementation of AMS (Austria Micro Systems) Indoor Air Quality Sensor Signed-off-by: Alexander Wachter <[email protected]>
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‎drivers/sensor/CMakeLists.txt‎

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@@ -5,6 +5,7 @@ add_subdirectory_ifdef(CONFIG_ADXL362 adxl362)
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add_subdirectory_ifdef(CONFIG_ADXL372 adxl372)
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add_subdirectory_ifdef(CONFIG_AK8975 ak8975)
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add_subdirectory_ifdef(CONFIG_AMG88XX amg88xx)
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add_subdirectory_ifdef(CONFIG_AMS_IAQ_CORE ams_iAQcore)
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add_subdirectory_ifdef(CONFIG_APDS9960 apds9960)
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add_subdirectory_ifdef(CONFIG_BMA280 bma280)
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add_subdirectory_ifdef(CONFIG_BMC150_MAGN bmc150_magn)

‎drivers/sensor/Kconfig‎

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@@ -35,6 +35,8 @@ source "drivers/sensor/ak8975/Kconfig"
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source "drivers/sensor/amg88xx/Kconfig"
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source "drivers/sensor/ams_iAQcore/Kconfig"
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source "drivers/sensor/apds9960/Kconfig"
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source "drivers/sensor/bma280/Kconfig"

‎drivers/sensor/ams_iAQcore/CMakeLists.txt‎

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# SPDX-License-Identifier: Apache-2.0
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zephyr_library()
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zephyr_library_sources_ifdef(CONFIG_AMS_IAQ_CORE iAQcore.c)

‎drivers/sensor/ams_iAQcore/Kconfig‎

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# Kconfig - iAQ-core Digital VOC sensor configuration options
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#
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# Copyright (c) 2018 Alexander Wachter
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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menuconfig AMS_IAQ_CORE
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bool "iAQ-core Digital VOC sensor"
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depends on I2C && HAS_DTS_I2C
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help
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Enable driver for iAQ-core Digital VOC sensor.
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if AMS_IAQ_CORE
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config IAQ_CORE_MAX_READ_RETRIES
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int "Number of read retries"
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default 4
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help
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Number of retries when reading failed or device not ready.
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endif # AMS_IAQ_CORE

‎drivers/sensor/ams_iAQcore/iAQcore.c‎

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/*
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* Copyright (c) 2018 Alexander Wachter.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <device.h>
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#include <i2c.h>
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#include <kernel.h>
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#include <misc/byteorder.h>
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#include <misc/util.h>
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#include <sensor.h>
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#include <misc/__assert.h>
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#include <logging/log.h>
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#include "iAQcore.h"
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#define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL
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LOG_MODULE_REGISTER(IAQ_CORE);
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static int iaqcore_sample_fetch(struct device *dev, enum sensor_channel chan)
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{
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struct iaq_core_data *drv_data = dev->driver_data;
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struct iaq_registers buf;
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struct i2c_msg msg;
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int ret, tries;
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
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msg.buf = (u8_t *)&buf;
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msg.len = sizeof(struct iaq_registers);
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msg.flags = I2C_MSG_READ | I2C_MSG_STOP;
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for (tries = 0; tries < CONFIG_IAQ_CORE_MAX_READ_RETRIES; tries++) {
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ret = i2c_transfer(drv_data->i2c, &msg, 1,
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DT_AMS_IAQCORE_0_BASE_ADDRESS);
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if (ret < 0) {
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LOG_ERR("Failed to read registers data [%d].", ret);
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return -EIO;
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}
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drv_data->status = buf.status;
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if (buf.status == 0x00) {
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drv_data->co2 = sys_be16_to_cpu(buf.co2_pred);
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drv_data->voc = sys_be16_to_cpu(buf.voc);
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drv_data->status = buf.status;
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drv_data->resistance = sys_be32_to_cpu(buf.resistance);
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return 0;
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}
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k_sleep(100);
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}
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if (drv_data->status == 0x01) {
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LOG_INF("Sensor data not available");
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}
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if (drv_data->status == 0x80) {
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LOG_ERR("Sensor Error");
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}
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return -EIO;
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}
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static int iaqcore_channel_get(struct device *dev,
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enum sensor_channel chan,
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struct sensor_value *val)
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{
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struct iaq_core_data *drv_data = dev->driver_data;
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switch (chan) {
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case SENSOR_CHAN_CO2:
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val->val1 = drv_data->co2;
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val->val2 = 0;
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break;
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case SENSOR_CHAN_VOC:
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val->val1 = drv_data->voc;
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val->val2 = 0;
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break;
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case SENSOR_CHAN_RESISTANCE:
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val->val1 = drv_data->resistance;
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val->val2 = 0;
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break;
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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 const struct sensor_driver_api iaq_core_driver_api = {
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.sample_fetch = iaqcore_sample_fetch,
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.channel_get = iaqcore_channel_get,
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};
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static int iaq_core_init(struct device *dev)
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{
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struct iaq_core_data *drv_data = dev->driver_data;
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drv_data->i2c = device_get_binding(DT_AMS_IAQCORE_0_BUS_NAME);
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if (drv_data->i2c == NULL) {
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LOG_ERR("Failed to get pointer to %s device!",
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DT_AMS_IAQCORE_0_BUS_NAME);
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return -EINVAL;
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}
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return 0;
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}
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static struct iaq_core_data iaq_core_driver;
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DEVICE_AND_API_INIT(iaq_core, DT_AMS_IAQCORE_0_LABEL, iaq_core_init,
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&iaq_core_driver, NULL, POST_KERNEL,
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CONFIG_SENSOR_INIT_PRIORITY, &iaq_core_driver_api);

‎drivers/sensor/ams_iAQcore/iAQcore.h‎

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/*
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* Copyright (c) 2018 Alexander Wachter
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_SENSOR_AMS_IAQCORE_IAQCORE_H_
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#define ZEPHYR_DRIVERS_SENSOR_AMS_IAQCORE_IAQCORE_H_
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#include <device.h>
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#include <misc/util.h>
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struct iaq_registers {
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u16_t co2_pred;
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u8_t status;
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s32_t resistance;
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u16_t voc;
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} __packed;
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struct iaq_core_data {
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struct device *i2c;
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u16_t co2;
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u16_t voc;
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u8_t status;
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s32_t resistance;
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};
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#endif /* ZEPHYR_DRIVERS_SENSOR_AMS_IAQCORE_IAQCORE_H_ */

‎dts/bindings/sensor/ams,iaqcore.yaml‎

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#
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# Copyright (c) 2018, Alexander Wachter
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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---
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title: AMS (Austria Mikro Systeme) Indoor Air Quality Sensor iAQ-core
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version: 0.1
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description: >
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This binding gives a base representation of iAQ-core indoor air quality
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sensor
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inherits:
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!include i2c-device.yaml
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properties:
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compatible:
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constraint: "ams,iaqcore"
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...

‎include/sensor.h‎

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SENSOR_CHAN_VOLTAGE,
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/** Current, in amps **/
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SENSOR_CHAN_CURRENT,
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/** Resistance , in Ohm **/
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SENSOR_CHAN_RESISTANCE,
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/** Angular rotation, in degrees */
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SENSOR_CHAN_ROTATION,

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