blob: 8c63f2169382e305d4bfde362b4681e57b24cb5f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
/*
* A magic 8 ball.
*
* Press the reset button to see into the future.
*
* View the answer to your question in the Serial Monitor, at 19200 baud.
*
* Press the Arduino reset button to ask another question.
*
*/
#include <TrueRandom.h>
char array[10];
int arrayLength = 10;
char macAddress[6]; // MAC addresses are always 6 bytes long
char uuidNumber[16]; // UUIDs are always 16 bytes long
void printHex(char number) {
// Print high hex digit
Serial.print( "0123456789ABCDEF"[number / 16] );
// Low hex digit
Serial.print( "0123456789ABCDEF"[number & 15] );
}
void printMac(char* macAddress) {
// Print a MAC address in the form
// 12:23:34:45:56:67
int i;
for (i=0; i<6; i++) {
printHex(macAddress[i]);
if (i<5) Serial.print(":");
}
}
void printUuid(char* uuidNumber) {
// Print a UUID in the form
// 12345678-1234-1234-1234-123456789ABC
int i;
for (i=0; i<16; i++) {
if (i==4) Serial.print("-");
if (i==6) Serial.print("-");
if (i==8) Serial.print("-");
if (i==10) Serial.print("-");
printHex(uuid[i]);
}
}
void setup() {
Serial.begin(9600);
// TrueRandom.rand() returns a positive integer
// in the range 0..32767
Serial.print("A random int: ");
Serial.println(TrueRandom.rand());
// TrueRandom.random() returns a positive long integer
// in the range 0..2,147,483,647
Serial.print("A random long int: ");
Serial.println(TrueRandom.random());
// TrueRandom.random(n) returns a positive long integer
// in the range 0 .. (n-1)
Serial.print("A random number between 0 and 999: ");
Serial.println(TrueRandom.random(1000));
// TrueRandom.random(a,b) returns a positive long integer
// in the range a .. (b-1).
// b must be larger than a.
Serial.print("A random number between 1000 and 9999: ");
Serial.println(TrueRandom.random(1000,10000));
// TrueRandom.randomBit() returns a single random bit
// It returns either 1 or 0.
Serial.print("A random bit: ");
Serial.println(TrueRandom.randomBit());
// TrueRandom.randomByte() returns a single random byte
// It returns an 8 bit char (byte) in the range -128 to 127.
Serial.print("A random byte: ");
Serial.println(TrueRandom.randomByte(),DEC);
// Zero an array
for(i=0; i<arrayLength; i++) array[i]=0;
Serial.print("An empty array of bytes: ")
for(i=0; i<arrayLength; i++) {
Serial.print(array[i],DEC);
}
Serial.println();
// Now randomise the array
// TrueRandom.memfill(startAddress,length) fills memory with
// random bytes.
TrueRandom.memfill(array,arrayLength);
Serial.print("A randomised array of bytes: ")
for(i=0; i<arrayLength; i++) {
Serial.print(array[i],DEC);
}
Serial.println();
// TrueRandom.mac(location) fills a 6 byte buffer with a
// random MAC address.
TrueRandom.mac(macAddress);
Serial.print("Here is a random MAC address: ");
printMac(macAddress);
Serial.println();
// TrueRandom.uuid(location) fills a 16 byte buffer with a
// random UUID.
TrueRandom.uuid(uuidNumber);
Serial.print("Here is a random UUID: ");
printUuid(uuidNumber);
Serial.println();
}
void loop() {
}
|
