Diff: main.cpp

Revision:

0:51d7f8d33957

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Aug 20 17:44:43 2018 +0000
@@ -0,0 +1,80 @@
+#include "mbed.h"
+ 
+
+int address = 0xA0;
+ 
+
+DigitalOut VCC(PB_5);
+DigitalOut GND(PB_13);
+I2C i2c(PB_4, PA_8);
+ 
+DigitalOut myled(LED1);
+ 
+Serial pc(SERIAL_TX, SERIAL_RX);
+
+
+void writeEEPROM(int address, unsigned int eeaddress, char *data, int size);
+void readEEPROM(int address, unsigned int eeaddress, char *data, int size);
+ 
+ 
+// this function has 63 bytes write limit
+void writeEEPROM(int address, unsigned int eeaddress, char *data, int size)
+{
+    char i2cBuffer[size + 2];
+    i2cBuffer[0] = (unsigned char)(eeaddress >> 8); // MSB
+    i2cBuffer[1] = (unsigned char)(eeaddress & 0xFF); // LSB
+ 
+    for (int i = 0; i < size; i++) {
+        i2cBuffer[i + 2] = data[i];
+    }
+ 
+    int result = i2c.write(address, i2cBuffer, size + 2, false);
+    wait_ms(6);
+}
+ 
+// this function has no read limit
+void readEEPROM(int address, unsigned int eeaddress, char *data, int size)
+{
+    char i2cBuffer[2];
+    i2cBuffer[0] = (unsigned char)(eeaddress >> 8); // MSB
+    i2cBuffer[1] = (unsigned char)(eeaddress & 0xFF); // LSB
+ 
+    // Reset eeprom pointer address
+    int result = i2c.write(address, i2cBuffer, 2, false);
+    wait_ms(6);
+ 
+    // Read eeprom
+    i2c.read(address, data, size);
+    wait_ms(6);
+}
+    
+ 
+int main()
+{
+ 
+    VCC=1;
+    GND=0;
+    
+    pc.printf("I2C EEPROM started...\n");
+ 
+    int pointerAdddress = 0;
+    
+    wait_ms(3000);
+ 
+    // write some data on eeprom
+    char writeData[] = {"1234567890"}; // 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);
+}
+