ECE8813 - Problem Set 4 - Solved

Watch the following videos:

(a)     https://youtu.be/C-BXzVBoJ3U : Algorithmic State Machine

(b)    https://youtu.be/5EcYI0NfvXg : Watching from time 0 to 21 minutes is required. The rest of the video is optional.

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PROBLEM 4.1:

Given: Farmer John has given some additional design clarifications. There are 10 zones that he wants to control. Each zone has different requirements for water, so he wants to be able to configure the times for each zone. The water pump is only large enough to water one zone at a time and so it is very important to only water 1 zone at a time regardless of the timing that is programmed. If more than one zone is set to be watered at time you must set the output to only water one zone and set the error out value to 1.

GPS control will be used for this design and a state machine to change zones. The state machine must be designed with an Algorithmic State Machine (ASM) diagram. Please turn in you ASM diagram and your block diagram at the start of class. The code will due turned in to T-Square. The module declaration should be as follows:

    module hw4  sprinkler ( clk ,           rain sensor in , gps data in , gps valid in ,             programvalid in ,          program zone in , program time in ,       zoneactive out ,                error out )

//Inputs

input
clk ;
input
rain sensor in ;
 input [7 :0 ] gps data in ; input gps valid in ; input program valid in ; input [4 :0 ] program zone in ; input [31:0] program time in ;

//outputs output [9 :0 ]                zone  active  out ; output error  out ;

Where program zone  in is set according to Table 1. The value of program zone in is passed as an unsigned value from 1 to 20. The value of program time in is set in the format hhmm in ASCII format. The program valid  in must be held high for 1 clock cycle to indicate the data on the program zone in and program time in are valid.

Table 1: Programming Zone Description

Value
Description
Value
Description
1
Zone 1 Start Time
2
Zone 1 End Time
3
Zone 2 Start Time
4
Zone 2 End Time
5
Zone 3 Start Time
6
Zone 3 End Time
7
Zone 4 Start Time
8
Zone 4 End Time
9
Zone 5 Start Time
10
Zone 5 End Time
11
Zone 6 Start Time
12
Zone 6 End Time
13
Zone 7 Start Time
14
Zone 7 End Time
15
Zone 8 Start Time
16
Zone 8 End Time
17
Zone 9 Start Time
18
Zone 9 End Time
19
Zone 10 Start Time
20
Zone 10 End Time
A file (zone program.txt)has also been attached to this assignment. Farmer John provided this file as an example watering schedule. The first column of the file is the program zone in and the second column is the program time in that should be passed to the module in ASCII format.