MUC Coursework

1
MUC Coursework

• Deadline 16 April
• Add all files to a folder, and send a compressed
  version of the folder (.zip or .tar) to
  niki_at_dcs.bbk.ac.uk by 26 March
• The compressed version should be named as
  follows Name_Surname.zip or Name_Surname.tar
• Add any comments about your coursework (brief
  description of files, problems encountered, etc.)
  into a file called intro.txt

2
Coursework (1/2)

• Problem
• 2n1 nodes, one gateway (with an ID of 0), n
  nodes with odd IDs, n nodes with even IDs
• Nodes with odd IDs collect light readings, those
  with even IDs collect temperature readings
• At every period
• the gateway asks the readings of the 2n nodes
• the nodes collect the readings and send them back
  to the gateway
• the gateway computes the average light and
  temperature

3
Coursework (2/2)

• The gateway
• Computes the average light and temperature at the
  beginning of each period (of five seconds)
• Sends the average light and temperature in a
  single packet to the UART
• The other nodes
• Send their readings after a random interval, so
  that the messages from different nodes are not
  sent at the same time

4
Design

• The gateway
• has a PeriodTimer
• sends BroadcastMsg
• receives LightMsg and TempMsg
• sends UartMsg
• The other nodes
• have a Light or Temp sensor
• receive BroadcastMsg
• have a DelayTimer
• send LightMsg or TempMsg

5
Architecture
CourseworkC
CourseworkM
Makefile
StdControl
Timer
Leds
SendMsg
ADC
ReceiveMsg
Random
LedsC
TimerC
RandomLFSR
DemoSensorC
Temp
GenericComm
Main
6
Hints (1/2)

• if (TOS_LOCAL_ADDRESS20) / even node /
  else / odd node /
• You cannot pass parameters to tasks, you need to
  use global variables
• Write a specific task for each message to send
• You can send to the serial port using
  TOS_UART_ADDRESS (and you can see those messages
  using export DBGuart)

7
Hints (2/2)

• The gateway needs four variables to compute the
  averages
• sumLight
• numberLight
• sumTemp
• numberTemp
• The nodes need only one variable
• lightValue or tempValue