px4flow module

PX4FLOW optical flow sensor

No detailed description...

Example for airframe file

Add to your firmware section: This example contains all possible configuration options, not all of them are mandatory!

<module name="px4flow">
  b'<configure name="PX4FLOW_NOISE_STDDEV" value="1.0" />\n    '
  b'<configure name="USE_PX4FLOW_AGL" value="1" />\n    '
  b'<configure name="PX4FLOW_COMPENSATE_ROTATION" value="1" />\n  '
</module>

Module configuration options

Configure Options

• name: PX4FLOW_NOISE_STDDEV value: 1.0
  Description: standard deviation of the flow measurement (if known)
• name: USE_PX4FLOW_AGL value: 1
  Description: update AGL measurements from onboard sonar
• name: PX4FLOW_COMPENSATE_ROTATION value: 1
  Description: compensate AGL measurements for body rotation

Module functions

Init Functions

These initialization functions are called once on startup.

• px4flow_init()

Periodic Functions

These functions are called periodically at the specified frequency from the module periodic loop.

• px4flow_downlink()
  • Frequency in Hz: 4
  • Autorun: FALSE
    Periodic function is started by user command.

Files

Header Files

The following headers are automatically included in modules.h

• px4flow.h

Source Files

• modules/optical_flow/px4flow.c

Raw px4flow.xml file:

<!DOCTYPE module SYSTEM "module.dtd">
 
<module name="px4flow" dir="optical_flow">
  <doc>
    <description>PX4FLOW optical flow sensor</description>
    <configure name="PX4FLOW_NOISE_STDDEV" value="1.0" description="standard deviation of the flow measurement (if known)"/>
    <configure name="USE_PX4FLOW_AGL" value="1" description="update AGL measurements from onboard sonar"/>
    <configure name="PX4FLOW_COMPENSATE_ROTATION" value="1" description="compensate AGL measurements for body rotation"/>
  </doc>
 
  <settings>
    <dl_settings NAME="optical flow">
      <dl_settings NAME="px4flow">
        <dl_setting MAX="1" MIN="0" STEP="1" VAR="px4flow_compensate_rotation" shortname="derotate_agl"/>
        <dl_setting MAX="1" MIN="0" STEP="1" VAR="px4flow_update_agl" shortname="update_agl"/>
        <dl_setting MAX="10" MIN="0" STEP="0.1" VAR="px4flow_stddev" shortname="stddev"/>
      </dl_settings>
    </dl_settings>
  </settings>
 
  <dep>
    <depends>mavlink_decoder</depends>
  </dep>
  <header>
    <file name="px4flow.h"/>
  </header>
  <init fun="px4flow_init()"/>
  <periodic fun="px4flow_downlink()" freq="4" autorun="FALSE"/> <!-- for debug -->
  <makefile>
    <configure name="PX4FLOW_NOISE_STDDEV" default="1.0"/>
    <configure name="USE_PX4FLOW_AGL" default="1"/>
    <configure name="PX4FLOW_COMPENSATE_ROTATION" default="1"/>
    <define name="PX4FLOW_NOISE_STDDEV" value="$(PX4FLOW_NOISE_STDDEV)"/>
    <define name="USE_PX4FLOW_AGL" value="$(USE_PX4FLOW_AGL)"/>
    <define name="PX4FLOW_COMPENSATE_ROTATION" value="$(PX4FLOW_COMPENSATE_ROTATION)"/>
    <file name="px4flow.c"/>
  </makefile>
</module>