include: drivers: sensor: add flow rate channel

Add flow rate to `enum sensor_channel` in litres per minute.

The SI unit for flow rate is cubic metres per second. Due to a sensor value
resolution of 1/100000 this unit is not granular enough for low flow rate
sensors.

Signed-off-by: Jeppe Odgaard <[email protected]>

Author: Jeppe Odgaard

drivers/sensor/sensor_shell.c

@@ -81,6 +81,7 @@ static const char *const sensor_channel_name[SENSOR_CHAN_COMMON_COUNT] = {
 	[SENSOR_CHAN_O2] = "o2",
 	[SENSOR_CHAN_VOC] = "voc",
 	[SENSOR_CHAN_GAS_RES] = "gas_resistance",
+	[SENSOR_CHAN_FLOW_RATE] = "flow_rate",
 	[SENSOR_CHAN_VOLTAGE] = "voltage",
 	[SENSOR_CHAN_VSHUNT] = "vshunt",
 	[SENSOR_CHAN_CURRENT] = "current",

include/zephyr/drivers/sensor.h

@@ -130,6 +130,8 @@ enum sensor_channel {
 	SENSOR_CHAN_VOC,
 	/** Gas sensor resistance in ohms. */
 	SENSOR_CHAN_GAS_RES,
+	/** Flow rate in litres per minute */
+	SENSOR_CHAN_FLOW_RATE,
 
 	/** Voltage, in volts **/
 	SENSOR_CHAN_VOLTAGE,

samples/sensor/sensor_shell/pytest/test_sensor_shell.py

@@ -41,7 +41,7 @@ def test_sensor_shell_attr_get(shell: Shell):
     assert any(['sensor@0(channel=co2, attr=sampling_frequency)' in line for line in lines]), 'expected response not found'
 
     shell.wait_for_prompt()
-    lines = shell.exec_command('sensor attr_get sensor@1 54 3')
+    lines = shell.exec_command('sensor attr_get sensor@1 55 3')
     assert any(['sensor@1(channel=gauge_state_of_health, attr=slope_th)' in line for line in lines]), 'expected response not found'
 
     logger.info('response is valid')
@@ -56,7 +56,7 @@ def test_sensor_shell_attr_set(shell: Shell):
     assert any([expected_line in line for line in lines]), 'expected response not found'
 
     shell.wait_for_prompt()
-    lines = shell.exec_command('sensor attr_set sensor@1 54 3 1')
+    lines = shell.exec_command('sensor attr_set sensor@1 55 3 1')
     expected_line = 'sensor@1 channel=gauge_state_of_health, attr=slope_th set to value=1'
     assert any([expected_line in line for line in lines]), 'expected response not found'