Revision 1:0aa405151a74, committed 2016-12-20

Comitter:

andcor02

Date:

Tue Dec 20 14:25:12 2016 +0000

Parent:

0:34c4fa6b49ac

Child:

2:9bbd68ef87c5

Commit message:

Library to R/W for 24LC256 EEPROM;

Changed in this revision

--- a/main.cpp	Wed Jul 20 10:43:06 2016 +0000
+++ b/main.cpp	Tue Dec 20 14:25:12 2016 +0000
@@ -1,73 +1,15 @@
-// NOTES:
-// 1. mbed.h MUST BE the revision from 30 Mar 2016, otherwise it will behave strange and unexpected! Older or newer versions won't work.
-//    For example, with the latest version of mbed.h from 25 May 2016, the "wait" function does not work at all, it's the same as if it's not there.
-// 2. writeEEPROM has 64 bytes limitation. If you want to write more at once, read http://www.hobbytronics.co.uk/eeprom-page-write how this guy made it work.
-//    Im not interested in storing data above 64 bytes (1 page). The 24LC256 chip has 4096 pages.
-// 3. reading the entire eeprom does its job until the 512 byte, then it will cycle from zero. I don't know why...
 #include "mbed.h"
 
+I2C i2c(PTE25, PTE24);
+Serial pc(USBTX, USBRX);
+int address = 0xA2;
+int pointerAdddress = 0;
+char s[64];
+
 // function declaration
 void writeEEPROM(int address, unsigned int eeaddress, char *data, int size);
 void readEEPROM(int address, unsigned int eeaddress, char *data, int size);
 
-// classes and functions instantiation
-I2C i2c(I2C_SDA, I2C_SCL);
-Serial pc(SERIAL_TX, SERIAL_RX);
-
-// settings
-int address = 0xA8; // in my case A2 = high, A1 = low, A0 = low, so the address is 1010 1000 = A8 (format 1 0 1 0 A3 A2 A1 R/W)
-
-int main()
-{
-    pc.printf("24LC256 I2C EEPROM started...\n");
-
-    int pointerAdddress = 0;
-
-    // write some data on eeprom
-    char writeData[] = {"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec f"}; // the text length must be below 64 bytes
-    char writeDataLen = 0;
-    do {writeDataLen++;} while (writeData[writeDataLen]); // calculate the text length
-    /*
-    writeEEPROM(address, pointerAdddress, writeData, writeDataLen);
-
-    pc.printf("Data written: %s\n", writeData);
-    */
-
-    // read the data back
-    char data_read[writeDataLen];
-    readEEPROM(address, pointerAdddress, data_read, writeDataLen);
-
-    pc.printf("Data read: %s\n", data_read);
-
-    // read the entire eeprom
-    /*
-    pc.printf("Printing the entire EEPROM array (64 columns, 4096 rows):\n");
-    int i;
-    char data_chunk[64];
-    int pointer;
-    for (i = 0; i < 4096; i++)
-    {
-        pointer = 64 * i;
-        readEEPROM(address, pointer, data_chunk, 64);
-        pc.printf("row: %4d, data: %s\n", i, data_chunk);
-    }
-    */
-
-    // delete the entire eeprom
-    /*
-    pc.printf("Deleting the entire EEPROM array (64 columns, 4096 rows):\n");
-    int i;
-    int pointer;
-    char deleteData[] = {"0000000000000000000000000000000000000000000000000000000000000000"}; // 64 bytes data length of zeros
-    for (i = 0; i < 4096; i++)
-    {
-        pointer = 64 * i;
-        writeEEPROM(address, pointer, deleteData, 64);
-    }
-    pc.printf("Erasing complete\n");
-    */
-}
-
 // this function has 63 bytes write limit
 void writeEEPROM(int address, unsigned int eeaddress, char *data, int size)
 {
@@ -97,4 +39,34 @@
     // Read eeprom
     i2c.read(address, data, size);
     wait_ms(6);
-}
\ No newline at end of file
+}
+
+int main()
+{
+    char data_read[64];
+    readEEPROM(address, pointerAdddress, data_read, 64);
+    pc.printf("Previous data stored: %s\n", data_read);
+    while(1){
+        
+    pc.gets(s,64);
+    char writeDataLen = 0;
+    do {writeDataLen++;} while (s[writeDataLen]); // calculate the text length
+    
+    writeEEPROM(address, pointerAdddress, s, writeDataLen);
+    pc.printf("Data written: %s\n", s);
+    
+    // read the data back
+    char data_read[writeDataLen];
+    readEEPROM(address, pointerAdddress, data_read, writeDataLen);
+    pc.printf("Data read: %s\n", data_read);
+    }
+
+}
+
+
+
+
+
+
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Tue Dec 20 14:25:12 2016 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#c3b9436e12610acaab723f730ab15b48a539a5ac

--- a/mbed.bld	Wed Jul 20 10:43:06 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/99a22ba036c9
\ No newline at end of file