Cas CravenNick Paine

Glen RhodesLev Shuhatovich

Joe Zugelter

A little black box for your motorcycle

Overview

• Concept• Hardware Design

o 9S12 Microcontrollero Fonera Wireless Routero Motorcycle

• Software Designo 9S12 Microcontrollero Fonera Wireless Routero iPhone Interfaceo Web Display

Concept

• Hardware and Software to track motorcycle state over time o State

GPS Location RPM Velocity Acceleration Gear

Battery

Ignition Coil

Speed Sensor

Gear Position Sensor

Function SwitchMotologger

AccelerometerGPS

Battery

Ignition Coil

Speed Sensor

Gear Position Sensor

Function SwitchMotologgerAccelerometer

GPS

System Diagram

Wifi SoCAtheros AR2315

SPI

Wifi

Serial

Data Acquisition Board

Data Flow

Hardware Design

• Hardware Requiredo Motorcycleo GPS Recievero Accelerometero SD Cardo Freescale 9S12X @ 40MHzo Fonera Wireless Router o iPhone

Fonera RouterAtheros MIPS-based SOC@180MHzRedbootOpenWRTSD MMC DriverUser Application

Kernel Panics are freeTrashing JFFS2 Made Easy!

Accelerometer

Microcontroller

MC9S12XD512

Status LEDs

Power LED

Ignition Coil

Speed Sensor

Function Switch

Gear Position

Ignition Switch

Battery Power Analog

Conditioning

Analog ConditioningAnalog Conditioning

Analog Conditioning

External Inputs

Wifi SoC

Tach Output

External Outputs

Internal Outputs

GPIO

Input Capture

Input Capture

A/D Converter

SPI

GPIO

GPIO

PWM

Serial

Power Distributio

n

GPIO

Processor Interface

Motorcycle Interface

Switching Power Supply

Fonera Internals

ConstrainedDesign

Placement Routing

PCB on top of Fonera

Fonera on Motorcycle

Software Design

• Microcontroller - For things Linux won't do wello Real-time data capture peripheral for Linux

Input capture timersTimer interruptsPulse width modulationHigh precision, high accuracy timingGPIO  Serial host communication

o Motorcycle management Output data to tachometer dial Spedometer output Indicator lights

(Cas)

Real Time Data Acquisition

• Freescale HS12XA256 as Real-Time subsystem• Real-time event scheduler

o Interrupt-driven Samplingo Arbitrary periodic eventso Timestamping to GPS UTC +- 1ms

• Foreground processo Binary serial communication with Fonerao Update outputs to motorcycle (tach, speedo, indicator

light)

(Cas)

Periodic Scheduling

• A parametric periodic scheduler was used for many of the repetitive tasks on the 6812.

(Nick)

Peripheral Acquisition Devices

• GPSo determines absolute position at 1hz

• Accelerometer (not implemented)o measures acceleration at higher frequencies

(Nick)

Communication and Control

• Sockets are file descriptors -> file descriptors for everything!

Network Connections (sockets) log files (.txt) serial port( /dev/ttyS0)

• Standard structs for data serialization:typedef struct _velData{char tag;char dummy;unsigned short time_stamp;unsigned short velocity;}velDataType;

case vel_tag:tag=((velDataType*)buf)->tag;        time_stamp = ((velDataType*)buf)->time_stamp; data1= ((velDataType*)buf)->velocity;sprintf(output,"%c,%d,%d,\n",tag,time_stamp,data1);break;

(Glen)

User Interface

• iPhone• Used Sockets for

network communication

(Glen)

Data Output

• Post Processing with Python• Presentation with Excel

  • Presentation with Google Maps

(Joe)

Testing 

Testing 

 

Testing 

 

Big Hurdles

• Bandwidth limitationso Atheros SoC(Fonera) couldn't process large

amounts of data.o 9S12 lost serial data when sending large number

of samples.

Future Work

• Log more types of datao We are only logging a subset of what we planned

• Increase sampling rateso Optimize communication protocol

o Decrease Bootup Timeo Add more bugs (features)o Integrate Data Post-Processing to iPhone

Work BreakdownLev – Hardware/Motorcycle interfacing,

DriversGlen – iPhone SW, CommsNick – Microcontroller SW (Task Scheduler,

GPS)Cas – Microcontroller SW (Comms, Drivers)Joe – Data Processing

Questions?

uP debugger