Laboratory Exercise: Power and Energy Efficiency in Embedded Systems - Engineering Assignment Help

Assignment Task:

Introduction

The aim of this lab is to use a hardware platform to develop and design low-power modes that are available in most modern embedded systems. The hardware platform used is an mbed NXP LPC1768 Microcontroller by Arm [1] as shown in Figure 1 and the software used is the mbed online complier. The online complier lets you write applications that run on embedded devices, by providing the layer that interprets your application's code in a way the hardware can understand. Your application code is written in C and C++.

4.2. Learning Outcomes (AS seen in the Module Guide and DMD)

1.    Understand appropriate techniques in smart and embedded systems engineering.

2.   Explain the sustainability factors in electronic design.

3.   Apply relevant technologies to smart embedded systems.

4.   Implement smart embedded systems and evaluate their performance.

Task 1. Changing the CPU Clock Divider settings
Compile and download Program Example 1 above to an mbed, first with the line CCLKCFG=0x00000005;commented out. The clock frequency will not be changed. 
Carefully record how many times the led flashes in 30 s. Now enable the divider code line, and run the program several times, with different values entered for CCLKCFG, initially in the range 2 to 9. For each record how many times the led flashes in 30 s.
1. Deduce what is the approximate duration of the delay function.
2. Which setting of CCLKCFG most closely matches your original reading? 

Task 2. Switching off the main PLL

Compile and download Program Example 2 to an mbed. Carefully measure how many times the LED flashes in one minute. It will be very slow. Can you explain the beats per minute that you measure for this, comparing with the first value recorded in Task 1?

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