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@page pfc_using Using Pre-Flight Checker
@tableofcontents

The Pre-Flight Checker (PFC) tool ensures proper operation of all connected
sensors and checks prerequisites required for the car to be safely driven in
autonomous mode. It is a shell script that consumes JSON files that define the
sensors it should check.

During installation, PFC is initialized for the current configuration.

@section pfc_prereq Prerequisites
PFC runs on these hardware platforms:
- NVIDIA DRIVE<sup>&trade;</sup> AGX Platform:
  Bench setup with all sensors connected.
- NVIDIA DRIVE AGX Platform: In-Car

For the following information, see the _NVIDIA DRIVE AV Release Notes_:
- Specifications on the supported NVIDIA DRIVE AGX Platform
- Software versions that PFC and NVIDIA DRIVE AV use

PFC must be installed with NVIDIA DRIVE<sup>&trade;</sup> AV.

@subsection pfc_prereq_bench_validation Bench Validation
Below are the prerequisites to ensure correct PFC results during bench mode
validation. In bench mode, sensor data usually comes from recordings, but it
can also come from sensors.

@note Currently, PFC bench validation supports only data from sensors.
It does not support recorded data.

- GPS sensor must have clear sky.
  If PFC is executed in a garage or closed environment, GPS data-validity may
  indicate failure.
- All camera and Radar sensors must be exposed to a valid environment.
  Specifically, cameras must:
  - Have a valid, unobstructed view.
    Cameras must not face a static view, such as a wall.
    Cameras must not be obstructed by barriers, such as trees, cloth, or mud.
  - Be exposed to appropriate lights.

  Radar sensor must be separated from objects by at least 1-meter; otherwise,
  Radar data-validity fails.

@subsection pfc_prereq_ic_validation In-Car Validation
Below are the prerequisite to ensure correct PFC results during in-car validation.

- Prerequisites specified for @ref pfc_prereq_bench_validation.
- CAR engine must be ON, the transmission must be in Park, and the steering
  must be unlocked; otherwise, CAN sanity fails.

@section pfc_running_autonomous Running in Autonomous Driving Mode

1. On the platform, navigate to:

       /usr/local/driveworks/tools/preFlightChecker/config

2. Enter:

       $ sudo ./pfc_run.sh --rig  <rig_file_path> --car agx-rel [--no-gui]
   Where
   - `<rig_file_path>` is the path of the rig.json file that specifies each
     sensors to validate, based on the setup configuration.
   - `<car_no>` identifies the car. For the NVIDIA AGX Platform, set this
     parameter to `agx-rel`.
     \n By default: `bench`.
   - `--no-gui` (optional) disables the PFC GUI and instead displays the result only on the console.

   For example:

        $ sudo ./pfc_run.sh --rig hyperion-7-1-release.json --car agx-rel --no-gui

   For NVIDIA Hyperion 7.1, the config rig file is available at:

       /usr/local/driveworks/tools/preFlightChecker/config/hyperion7-1-release.json

3. PFC updates the log output as specified in `hyperion7-1-release.json`.
   It also displays the current sensor status in a sequence of four images:
   - Summary: The first window shows a summary of sensor status (screen shot follows).
   - Detail: Use the RIGHT-ARROW key to navigate to the detail windows, which
     includes multiple pages. Use the RIGHT- and LEFT-ARROW keys to navigate
     between pages.
     \n An example of the detailed information follows.

![](pfc_summary.png)
\n \n
![](pfc_detail_table.png)

@section pfc_running_bench Running in Bench Mode

When you use PFC in bench mode, it performs the same checks as in autonomous
mode. However, in bench mode, CAN devices are unavailable. Those devices include
brake, throttle, gear & steering. As a result, validation of those devices
always fails.

1. On the platform, navigate to:

       /usr/local/driveworks/tools/preFlightChecker/config

2. Enter:

       $ sudo ./pfc_run.sh --rig  <rig_file_path>
   Where
   - `<rig_file_path>` is the path of the rig.json file that specifies each
     sensors to validate, based on the setup configuration.

   For example:

       $ sudo ./pfc_run.sh --rig hyperion7-1-release.json

   For NVIDIA Hyperion 7.1, the config rig file is available at:

       /usr/local/driveworks/tools/preFlightChecker/config/hyperion7-1-release.json


@section pfc_log Generating a Data Log

By default, PFC generates a log.

@note If debug logs are enabled, there is a possibility of CAN Sanity and IMU/GPS
data-validity failure. This failure is from the logging latency.

The following is an example of the log output.

![](pfc_log.png)

The log provides the following information:
- SENSOR NAME: Sensor name and type, as specified in rig file. For example,
  camera, Lidar, or Radar. When available, this field also shows the
  sensor position.
- INIT: Status of sensor initialization.
- DATA-RATE (mega-pixels/second): Rate at which the sensor feeds the data to PFC.
  Applies to cameras only.
- FREQUENCY (Hertz): Number of frames available per second.
- DATA-VALIDATE: Status of the data validity check performed on sensors.
  Supported values are:
  - VALID: Sensor is providing valid data.
  - NOT_IMPL: Support for the specified sensor is not yet implemented.
  - -NA-: Indicates the attribute, such as DATA-RATE, does not apply to the sensor.

  For information on how PFC determines data validity, see @ref pfc_features.

@section pfc_trouble Interpreting the Log

This section explains how to interpret information in the log.

@subsection pfc_trouble_freq Sensor Frequency Is Zero
The `FREQUENCY` field for a sensor show a value of zero when data is not available.
This can happen even though the sensor is connected properly. These symptoms
can be due to:
- For GPS, the signal strength is weak.
- For Lidar or Radar, the sensor is blocked.

@subsection pfc_trouble_invalid Sensor Has INVALID Status

The `DATA-VALIDATE` field for a camera shows `INVALID` when there are issues with
the sensor position.

#### To fix in bench mode
- Re-align camera sensor

#### To fix in autonomous vehicle mode
- Move the car to a different location.