1+ /*
2+ Reading and writing test of the EEPROM functions on the Artemis
3+ By: Nathan Seidle
4+ SparkFun Electronics
5+ Date: June 24th, 2019
6+ This example code is in the public domain.
7+
8+ SparkFun labored with love to create this code. Feel like supporting open source hardware?
9+ Buy a board from SparkFun! https://www.sparkfun.com/products/15376
10+
11+ Page erase takes 15ms
12+ Write byte takes 30ms - This is much longer than Arduino that takes 3.3ms
13+ Float write across two words takes 30ms
14+ Update (no write) takes 1ms
15+ */
16+
17+ #include < EEPROM.h>
18+
19+ // Give a default if the variant does not define one.
20+ #ifndef A0
21+ #define A0 0
22+ #endif
23+
24+ void setup ()
25+ {
26+ Serial.begin (115200 );
27+ Serial.println (" EEPROM Examples"
28+
29+ randomSeed (analogRead (A0));
30+
31+ EEPROM.init ();
32+
33+ // You may choose to enable more or less EEPROM -
34+ // Default length is 1024 bytes (if setLength is not called)
35+ EEPROM.setLength (1024 * 1 ); // this would make the length 1080 bytes. Max is 4096.
36+ // Note: larger sizes will increase RAM usage and execution time
37+
38+ long startTime;
39+ long endTime;
40+ int randomLocation;
41+
42+ // Test erase time
43+ startTime = millis ();
44+ EEPROM.erase ();
45+ endTime = millis ();
46+ Serial.printf (" Time to erase all EEPROM: %dms\n "
47+
48+ // Byte sequential test
49+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
50+ Serial.println ();
51+ Serial.println (" 8 bit tests"
52+ uint8_t myValue1 = 200 ;
53+ byte myValue2 = 23 ;
54+ randomLocation = random (0 , EEPROM.length () - sizeof (myValue1));
55+
56+ startTime = millis ();
57+ EEPROM.write (randomLocation, myValue1); // (location, data)
58+ endTime = millis ();
59+ EEPROM.put (randomLocation + sizeof (myValue1), myValue2);
60+
61+ Serial.printf (" Write byte time: %dms\n "
62+
63+ startTime = millis ();
64+ EEPROM.write (randomLocation, myValue1); // (location, data)
65+ endTime = millis ();
66+
67+ Serial.printf (" Write identical byte to same location: %dms\n "
68+
69+ byte response1 = EEPROM.read (randomLocation);
70+ byte response2 = EEPROM.read (randomLocation + sizeof (myValue1));
71+ Serial.printf (" Location %d should be %d: %d\n\r "
72+ Serial.printf (" Location %d should be %d: %d\n\r " sizeof (myValue1), myValue2, response2);
73+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
74+
75+ Serial.println ();
76+ Serial.println (" 16 bit tests"
77+
78+ // int16_t and uint16_t sequential test
79+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
80+ uint16_t myValue3 = 3411 ;
81+ int16_t myValue4 = -366 ;
82+ randomLocation = random (0 , EEPROM.length () - sizeof (myValue3));
83+
84+ EEPROM.put (randomLocation, myValue3);
85+ EEPROM.put (randomLocation + sizeof (myValue3), myValue4);
86+
87+ uint16_t response3;
88+ int16_t response4;
89+ EEPROM.get (randomLocation, response3);
90+ EEPROM.get (randomLocation + sizeof (myValue3), response4);
91+ Serial.printf (" Location %d should be %d: %d\n\r "
92+ Serial.printf (" Location %d should be %d: %d\n\r " sizeof (myValue3), myValue4, response4);
93+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
94+
95+ Serial.println ();
96+ Serial.println (" 32 bit tests"
97+
98+ // int and unsigned int (32) sequential test
99+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
100+ Serial.printf (" Size of int: %d\n " sizeof (int ));
101+ int myValue5 = -245000 ;
102+ unsigned int myValue6 = 400123 ;
103+ randomLocation = random (0 , EEPROM.length () - sizeof (myValue5));
104+
105+ EEPROM.put (randomLocation, myValue5);
106+ EEPROM.put (randomLocation + sizeof (myValue5), myValue6);
107+
108+ int response5;
109+ unsigned int response6;
110+ EEPROM.get (randomLocation, response5);
111+ EEPROM.get (randomLocation + sizeof (myValue5), response6);
112+ Serial.printf (" Location %d should be %d: %d\n\r "
113+ Serial.printf (" Location %d should be %d: %d\n\r " sizeof (myValue5), myValue6, response6);
114+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
115+
116+ // int32_t and uint32_t sequential test
117+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
118+ int32_t myValue7 = -341002 ;
119+ uint32_t myValue8 = 241544 ;
120+ randomLocation = random (0 , EEPROM.length () - sizeof (myValue7));
121+
122+ EEPROM.put (randomLocation, myValue7);
123+ EEPROM.put (randomLocation + sizeof (myValue7), myValue8);
124+
125+ int32_t response7;
126+ uint32_t response8;
127+ EEPROM.get (randomLocation, response7);
128+ EEPROM.get (randomLocation + sizeof (myValue7), response8);
129+ Serial.printf (" Location %d should be %d: %d\n\r "
130+ Serial.printf (" Location %d should be %d: %d\n\r " sizeof (myValue7), myValue8, response8);
131+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
132+
133+ // float (32) sequential test
134+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
135+ Serial.printf (" Size of float: %d\n " sizeof (float ));
136+ float myValue9 = -7.35 ;
137+ float myValue10 = 5.22 ;
138+ randomLocation = random (0 , EEPROM.length () - sizeof (myValue9));
139+
140+ EEPROM.put (randomLocation, myValue9);
141+ EEPROM.put (randomLocation + sizeof (myValue9), myValue10);
142+
143+ float response9;
144+ float response10;
145+ EEPROM.get (randomLocation, response9);
146+ EEPROM.get (randomLocation + sizeof (myValue9), response10);
147+ Serial.printf (" Location %d should be "
148+ Serial.print (myValue9);
149+ Serial.print (" : "
150+ Serial.print (response9);
151+ Serial.println ();
152+ Serial.printf (" Location %d should be " sizeof (myValue9));
153+ Serial.print (myValue10);
154+ Serial.print (" : "
155+ Serial.print (response10);
156+ Serial.println ();
157+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
158+
159+ Serial.println ();
160+ Serial.println (" 64 bit tests"
161+
162+ // double (64) sequential test
163+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
164+ Serial.printf (" Size of double: %d\n " sizeof (double ));
165+ double myValue11 = -290.3485723409857 ;
166+ double myValue12 = 384.95734987 ;
167+ double myValue13 = 917.14159 ;
168+ double myValue14 = 254.8877 ;
169+ randomLocation = random (0 , EEPROM.length () - sizeof (myValue11));
170+
171+ startTime = millis ();
172+ EEPROM.put (randomLocation, myValue11);
173+ endTime = millis ();
174+ Serial.printf (" Time to record 64-bits: %dms\n "
175+
176+ EEPROM.put (randomLocation + sizeof (myValue11), myValue12);
177+ EEPROM.put (EEPROM.length () - sizeof (myValue13), myValue13); // Test end of EEPROM space
178+
179+ double response11;
180+ double response12;
181+ double response13;
182+ EEPROM.get (randomLocation, response11);
183+ EEPROM.get (randomLocation + sizeof (myValue11), response12);
184+ EEPROM.get (EEPROM.length () - sizeof (myValue13), response13);
185+
186+ Serial.printf (" Location %d should be "
187+ Serial.print (myValue11, 13 );
188+ Serial.print (" : "
189+ Serial.print (response11, 13 );
190+ Serial.println ();
191+ Serial.printf (" Location %d should be " sizeof (myValue11));
192+ Serial.print (myValue12, 8 );
193+ Serial.print (" : "
194+ Serial.print (response12, 8 );
195+ Serial.println ();
196+ Serial.printf (" Edge of EEPROM %d should be " length () - sizeof (myValue13));
197+ Serial.print (myValue13, 5 );
198+ Serial.print (" : "
199+ Serial.print (response13, 5 );
200+ Serial.println ();
201+
202+ double response14;
203+ EEPROM.put (EEPROM.length () - sizeof (myValue14), myValue14); // Test the re-write of a spot
204+ EEPROM.get (EEPROM.length () - sizeof (myValue14), response14);
205+ Serial.printf (" Rewrite of %d should be " length () - sizeof (myValue14));
206+ Serial.print (myValue14, 4 );
207+ Serial.print (" : "
208+ Serial.print (response14, 4 );
209+ Serial.println ();
210+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
211+
212+ Serial.println ();
213+ Serial.println (" String test"
214+
215+ // String write test
216+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
217+ char myString[19 ] = " How are you today?"
218+ randomLocation = random (0 , EEPROM.length () - sizeof (myString));
219+ EEPROM.put (randomLocation, myString);
220+
221+ char readMy[19 ];
222+ EEPROM.get (randomLocation, readMy);
223+ Serial.printf (" Location %d string should read 'How are you today?': "
224+ Serial.println (readMy);
225+ // -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
226+
227+ }
228+
229+ void loop ()
230+ {
231+ }
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