mayhem-firmware

Table of Contents

Data fields are:

Tire Pressure Monitoring System (TPMS) operate in the ISM Licence free bands. In USA and most of the world they use 315MHz, in Europe the frequency is 433.92MHz. The TPMS App work well with many common standards used in the automotive industry particularly from Schrader TPMS sensors., and this seems a common standard used in the automotive industry.

The TPMS App display is configured to display the decoded data received from the tire pressure sensors. The interval of the data being sent by each tire varies from every few seconds to minutes depending on the car and sensors, often triggered by wheel movement or rapid pressure changes. Most Schrader sensors can also be triggered to transmit data using a TPMS test tool (which transmits a signal on 125 kHz).

The Key Items on the App that can be selected with the cursor and changed with the encoder knob are: Title bar: The usual Items may be changed and displayed.

Frequency: Either 315MHz or 433.92MHz
kPa/PSI : By highlighting this item the units of pressure displayed can be changed between kPA and PSI.
C/F : By highlighting this item the units of temperature displayed can be changed between Celsius and Fahrenheit.
Gain: Setting are shown in order of Amp 0=0db or 1=14dB, LNA(IF) (0-40) and VGA (Baseband Gain) (0-62).

Data fields are:

Tp: This is the type of the tire sensor decoded the following are coded in the App. Some types of TPMS sensors are not supported.
- 0 = None
- 1= FLM_64
- 2= FLM_72
- 3= FLM_80
- 4= Schrader
- 5= GMC_96
ID: The ID of the tire sensor being 8 hexadecimal characters. Note that sometimes the label printed on the actual temperature sensor is in decimal format.
Pres: This is the pressure in either kilo Pascals (kPa) or Pounds Per Square Inch (PSI).
Temp: The temperature of the tire in either degrees Celsius (C) or Fahrenheit (F). Note Spurious data has been seen and may be due to receive errors, unsupported protocols, or failed sensors. Pressure and temperature ranges may vary depending on sensor model, so best to compare to dash readings, if available.
Cnt: This is the count of messages received from each sensor.
Flags: Information on the type of sensor is only for Schrader and have decode for: fsk_19k, ook_8k192, ook_8k4.

If a FAT-formatted micro SD card is present when this mode is entered, the receiver will log received packets to a file named "TPMS.TXT". The log file contains one line per packet received. Each line consists of a timestamp in sortable "YYYYMMDDHHMMSS" format, receiver frequency, modulation, deviation, symbol rate, and data. The data field consists of Manchester-decoded data bits, a "/", and a per-bit Manchester coding error indicator ("1" if the data bit is in error).

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Start here

How to collaborate
How to ask questions correctly

User manual

First steps
- About firmwares
- Redirections on this manual/project
Usage cautions
Intended use and Legality
Features
PortaPack Versions (which one to buy)
HackRF Versions
- Original GSG HackRF One
- Clifford's-version
Firmware update procedure
- Updating the Xilinx CPLD on hackrf board
Description of the hardware
- Enclosure/cases
  - 3d printed enclosure
- Internal speaker
- SMD buttons and caps
- Encoder knob
- SMA Connector replacement or removal
User interface
Powering the PortaPack
Troubleshooting
Applications
- Receivers
  - ADS-B
  - AFSK
  - AIS Boats
  - Analog TV
  - APRS
  - Audio
  - BLE RX
  - ERT Meter
  - Level
  - NRF
  - POCSAG
  - Radiosonde
  - Recon
  - Search
  - TPMS Cars
  - Weather/SubGhzD
  - Fox-Hunt
  - ProtoView
- Transmitters
  - ADS-B(S)
  - APRS
  - BHT Xy/EP
  - BLE TX
  - Burger Pager
  - GPS Sim
  - Jammer
  - LGE Tool
  - Morse
  - OOK
  - OOK Editor
  - POCSAG
  - RDS
  - Soundboard
  - Spectrum Painter
  - SSTV
  - TEDI/LCR
  - TouchTunes
  - BLESpam
- Capture
  - C16 Format
- Replay
- Remote
- Scanner
- Microphone Transceiver
- Looking Glass
- Utilities
- Settings
  - App Settings
  - Audio
  - Blacklist
  - Calibration
  - Touchscreen Threshold
  - Config Mode
  - Converter
  - Date/time
  - Encoder Dial
  - Freq. Correct
  - P.Mem Mgmt
  - QR code
  - Radio
  - User Interface
  - Brightness
  - Menu Color
- Debug
- HackRF Mode
- USB Serial Console

Developer Manual

Compilation of the firmware
Create a custom map
Code formatting
PR process
Description of the Structure
Software Dev Guides
- Code contribution rules
- Create a Simple App
- Building External Apps
- Widgets
- SD Card
- Access Radio Hardware
- Interpret Guru meditation crashes
- Create a Complex App
- Theme-system
- Debug via SWD & JTAG
- Debug with serial
- I2C drivers
Tools
Research
- Dissecting the Temperature Logger
- Differences between H1 and H2
UI Screenshots
Maintaining
- Creating a prod/stable release (Maintainers only)
- Maintaining rules
Development States Notes

Hardware Hacks

Repairs
- Replace AMP
Mods
- Add GPIO TO H2
- USB‐C charging modification for older HackRF boards

Note

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