#include "mbed.h"


I2C i2c(p9, p10);        // sda, scl
Serial pc(USBTX, USBRX); // tx, rx

const int addr = 0x68; // define the I2C Address

int main() {
  
    char cmd[10];
    
        cmd[0] = 0x0;            // pointer to command register
        cmd[1] = 0xd1;          //read address. I dont know if these is are correct addresses
        cmd[2]=0xd0 ;            //write address
        cmd[3]=0x03f;              //some address
        
        
                 
        i2c.write(addr, cmd, 2); // Send command string
        i2c.read(addr,cmd,3);
        pc.printf("cmd[2]= %x\n",cmd[2]);
        pc.printf("Mystring= %x\n",cmd[3]);
        
}

Where can I find out how to do the bit level manipulation so I can read the data from my i2c device DS1307 real time clock. My programming experience is limited to VBA and the like. Attached is the DS1307 datasheet and I would like to know where to start with the mbed i2c library.Which reads and writes should I do and in what order ? [[/media/uploads/GregMartin/ds1307.pdf]] <<code>> #include "mbed.h" I2C i2c(p9, p10); // sda, scl Serial pc(USBTX, USBRX); // tx, rx const int addr = 0x68; // define the I2C Address int main() { char cmd[10]; cmd[0] = 0x0; // pointer to command register cmd[1] = 0xd1; //read address. I dont know if these is are correct addresses cmd[2]=0xd0 ; //write address cmd[3]=0x03f; //some address i2c.write(addr, cmd, 2); // Send command string i2c.read(addr,cmd,3); pc.printf("cmd[2]= %x\n",cmd[2]); pc.printf("Mystring= %x\n",cmd[3]); } <</code>>

const int addr = 0xD0; // define the I2C Address [mbed]
const int addr = 0x68; // define the I2C Address [arduino]

change to <<code>> const int addr = 0xD0; // define the I2C Address [mbed] const int addr = 0x68; // define the I2C Address [arduino] <</code>> I don't know which one is correct, since datasheet says 1101000 pak

Gregory, I use library http://mbed.org/users/leihen/code/RTC-DS1307/ Everything works well as far as the RTC functions go, though I am having a problem getting setSquareWaveOutput() to work ...kevin