Diff: i2c_eeprom.cpp

Revision:

0:cbf45dde2b49

Child:

5:a0fe74dce80d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/i2c_eeprom.cpp	Mon Feb 21 07:35:16 2011 +0000
@@ -0,0 +1,96 @@
+/*H****************************************************************************
+* FILENAME :        i2c_eeprom.cpp                                            *
+*                                                                             *
+* DESCRIPTION :                                                               *
+*       Simple library for external I2C EEEPROM.                              *
+*                                                                             *
+* AUTHOR :    Olli Vanhoja        START DATE :    2011-02-17                  *
+*******************************************************************************
+*
+* CHANGES :
+*
+* VERSION DATE       WHO             DETAIL
+* 0.1     2011-02-21 Olli Vanhoja    Initial release version
+*
+*H*/
+
+#include "mbed.h"
+#include "i2c_eeprom.h"
+
+I2C i2c(p28, p27);
+DigitalOut BusyLed(LED1);
+
+i2c_eeprom::i2c_eeprom()
+{
+}
+
+i2c_eeprom::i2c_eeprom(int hwAddr)
+{
+    i_i2c_address = hwAddr;
+}
+
+void i2c_eeprom::write(char *data, uint16 iAddr, unsigned int n)
+{
+    char *pi2c_data[3]; // Pointers for CW items
+    char i2c_data[3];   // Final CW
+    
+    BusyLed = 1;
+
+    /* Convert address to hi and low byte array
+     * This is really pointless even though they are
+     * called pointers it would be lot easier to do this
+     * conversion without any pointers */
+    uint16 *piAddr = &iAddr;
+    pi2c_data[0] = (char *)piAddr+1;
+    pi2c_data[1] = (char *)piAddr;
+    
+    for (uint16 i=0; i < n; i++)
+    {
+        pi2c_data[2] = &data[i];
+        
+        // Apply actual values from pointer
+        //for (int n=0; n < 3; n++)
+        //    i2c_data[n] = *pi2c_data[n];
+        i2c_data[0] = *pi2c_data[0];
+        i2c_data[1] = *pi2c_data[1];
+        i2c_data[2] = *pi2c_data[2];
+        
+        // Send write command
+        if(i2c.write(i_i2c_address, i2c_data, 3))
+            error("Write failed!\n\r");
+        
+        iAddr++; // increment address counter
+
+        // Wait for ACK        
+        while(i2c.write(i_i2c_address, NULL, 0)){}
+    }
+    
+    BusyLed = 0;
+}
+
+void i2c_eeprom::read(uint16 iAddr, uint16 n, char *out)
+{
+    char *pi2c_data[2]; // Pointers for CW items
+    char i2c_data[2];   // Final CW
+    
+    uint16 *piAddr = &iAddr;
+    pi2c_data[0] = (char *)piAddr+1;
+    pi2c_data[1] = (char *)piAddr;
+    
+    BusyLed = 1;
+    
+    // Apply actual values from pointer
+    //for (int i=0; i < 2; i++)
+    //    i2c_data[i] = *pi2c_data[i];
+    i2c_data[0] = *pi2c_data[0];
+    i2c_data[1] = *pi2c_data[1];
+    
+    // Send read command
+    if(i2c.write(i_i2c_address, i2c_data, 2))
+        error("Read failed! ref:1\n\r");
+    
+    if(i2c.read(i_i2c_address, out, n))
+        error("Read failed! ref:2\n\r");
+    
+    BusyLed = 0;
+}