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EMBEDDED SYSTEMS [6/9 credits course]

THEORY

8 T/F questions: 0.5 points for right answers, -0.25 points for wrong ones, and 0 for no answer

3 open questions: up to 2 points for right and complete answers

Available time: 60 minutes

C4uC

1 C4uC exercise: up to 12 points for right and complete solutions

Available time: 120 minutes

Name:

THEORY: TRUE or FALSE? F

1) system is always designed to be as general-purpose as possible.

An embedded V

To exploit a Digital Signal Processor

2) it is needed a specific compiler. F

3) Intel 8051 model used in the homelab has only 2 input/output ports.

The V

4) on processors without a Floating Point Unit.

It is possible to use floating-point arithmetic also V

5) About WSN homelab: the notation install.ID is used to assign an ID to the target node.

F

6) kits are useful only for FPGA-based development.

Development V

7) TIVA board used in the homelab contains an ARM core. F

Granularities used for active and passive roles of the time are always the same.

8) OPEN QUESTIONS

THEORY:

1) Describe the main Processors Technologies and their differences.

2) Describe UMA (Unified Memory Access) and NUMA (Not UMA) systems and their differences.

3) Describe the concept of Time-to-Market and its relationship with embedded systems design.

EMBEDDED SYSTEMS [6/9 credits course]

THEORY

8 T/F questions: 0.5 points for right answers, -0.25 points for wrong ones, and 0 for no answer

3 open questions: up to 2 points for right and complete answers

Available time: 60 minutes

C4uC

1 C4uC exercise: up to 12 points for right and complete solutions

Available time: 120 minutes

Name:

THEORY: TRUE or FALSE? F

1) 1 General Purpose Processor.

An embedded system contains always at least V

is needed a specific compiler.

To exploit a Single Purpose Processor it

2) V

3) It is possible to use fixed-point arithmetic also on processors without a Floating Point Unit. F

About WSN homelab: the notation install.ID is used to select the USB port connected to the PC.

4) F

5) kits are useful only for Wireless Sensor Networks development.

Development F

TIVA board used in the homelab contains an Application Specific Processor.

6) F

7) Timers implementation based on “minimal HW/SW” are the best for hard real-time systems

nesC code related to an event management …

Given the following

8) event void myTimer.fired()

{ counter++;

call Leds.Led0Toggle();

if (!busy)

{ BlinkToRadioMsg* btrpkt = (BlinkToRadioMsg*)(call Packet.getPayload(&pkt, NULL));

btrpkt->nodeid = TOS_NODE_ID;

btrpkt->counter = counter;

if (call AMSend.send(AM_BROADCAST_ADDR, &pkt, sizeof(BlinkToRadioMsg)) == SUCCESS)

{ busy = TRUE;

}

}

} F

it belongs to a Configuration component .

THEORY: OPEN QUESTIONS

1) Describe the main differences between Cache and Scratch Pad memories.

2) Describe the main components of a Design Technology and their role.

3) Describe the most common Active Temporizations.

EMBEDDED SYSTEMS 2016/2017/2018: THEORY [6/9 credits course]

8 T/F questions: 0.5 points for right answers, -0.25 points for wrong ones, and 0 for no answer

3 open questions: up to 2 points for right and complete answers

Max total: 10 points

Available time: 60 minutes

Name:__________________________________________________________________________

TRUE or FALSE? F

An embedded system is always designed to be as general-purpose as possible.

1) V

2) To exploit a Single Purpose Processor it is needed a compiler for a specific ISA.

The opportunity to perform of kernel processes allows to avoid the priority inversion

3) preemption

problem.

4) The Instruction Set Architecture of an Applications Specific Instructions Processor is normally

V

customizable. F

The Intel 8051 model used in the homelab has only 2 input/output ports.

5) V

6) Phase Change Memories are non-volatile ones. V

7) arithmetic also on processors without a FPU.

It is possible to use floating-point

8) the utilization factor of a task set is greater than 1, the task set cannot be scheduled.

If

OPEN QUESTIONS

1) Describe the different “Processors Technologies” and their main differences.

2) Describe the RM and EDF scheduling algorithms and their main differences.

3) Given the following code, complete the sequence diagram (reporting comments, if needed), indicating all

the (possible) calls and events in the first 1000 ms of execution (after the first indicated event).

module BlinkC()

configuration BlinkAppC {

{ uses interface Timer<TMilli> as Timer0;

} uses interface Timer<TMilli> as Timer1;

implementation uses interface Timer<TMilli> as Timer2;

{ uses interface Leds;

components MainC, BlinkC, LedsC; uses interface Boot;

components new TimerMilliC() as Timer0;

components new TimerMilliC() as Timer1; }

components new TimerMilliC() as Timer2; implementation

{ event void Boot.booted()

BlinkC -> MainC.Boot; { call Timer0.startPeriodic( 200 );

BlinkC.Timer0 -> Timer0; call Timer1.startPeriodic( 350 );

BlinkC.Timer1 -> Timer1; call Timer2.startPeriodic( 950 );

BlinkC.Timer2 -> Timer2; }

BlinkC.Leds -> LedsC;

} event void Timer0.fired()

{ call Leds.led0Toggle();

}

event void Timer1.fired()

{ call Leds.led1Toggle();

}

event void Timer2.fired()

{ call Leds.led2Toggle();

}

}

EMBEDDED SYSTEMS 2016/2017/2018: THEORY [6/9 credits course]

8 T/F questions: 0.5 points for right answers, -0.25 points for wrong ones, and 0 for no answer

3 open questions: up to 2 points for right and complete answers

total: 10 points

Max time: 60 minutes

Available

Name:__________________________________________________________________________

TRUE or FALSE? F

An embedded system is always designed to be as general-purpose as possible.

1) V

To exploit a Single Purpose Processor it is needed a compiler for a specific ISA.

2)

3) A real-time application that is feasible on a given processor can become infeasible when running on a

V

faster processor. F

The Instruction

4) Set Architecture of a Single Purpose Processor is normally customizable