Homework 4
UCR EE/CS120B: Intro. to Embedded Systems
Fall Quarter 2002, Prof. F. Vahid
Due Tuesday Nov 26 at beginning of lecture

1. A particular pulse-width modulator that comes with a microcontroller
   generates a pulse with a high of 3 V and a low of 0 V. The maximum 
   period is 1 millisecond, and minimum period is 1 microsecond. Assume 
   the period and duty cycle can be set in C by writing to global 
   variables "period" and "dutycycle." Write a subroutine called
   PWM_GenerateAvgVoltage(float V) that takes a parameter V indicating
   the desired average output voltage, and sets the period and duty cycle 
   variables of the PWM appropriately.
   
2. ESD 4.2 (watchdog timers), but within 3 minutes rather than 5 minutes.

3. ESD 4.10 (stepper motor control), but forward 20 and backward 10.

4. ESD 4.12, (analog-digital encoding), but for a voltage range of 0 to 5 V,
   and for a 12-bit digital encoding. 

5. ESD 4.15 (analog-digital encoding), but for a 12-bit digital encoding.

6. ESD 5.6 (composing memory)

7. ESD 5.10 (cache access rate)

8. ESD 6.2 (port/bus-based I/O)

9. ESD 6.3 (extended parallel I/O)