That appears to be correct since it appears you don't have to identify a register you want to write to. I would double check your hardware setup to make sure you address is correct. Do you have a logic analyzer (even a cheap usb one would be fine). The idea would be to see if you are transmitting da...

So I get that you are new, but you need to read the datasheet. To write, the master (microcontroller) first addresses the slave device. By setting the last bit of the byte containing the slave address to logic 0 the write mode is entered. The PCA9670 acknowledges and the master sends the data byte f...

Take a look at the datasheet for the part. Specifically section 8.2 page 12.

http://www.nxp.com/documents/data_sheet/PCA9670.pdf

Make sure you have pull resistors enabled for SCL and SDA. Without digging too deep, I also don't know the PIC32 all that well, is there a restart or not. If there isn't then it looks good otherwise the second start should be a restart. unsigned short L3GD20_ReadReg(unsigned short address, unsigned ...

How do you set the Config Bits? Through Project Settings Is there a way to view/edit the startup code the is obviously being done by MicroC? Not sure... I often like to view the source code of the library functions, and modify them to fit my application. Is the source code of library functions visi...

Rather than having me explain every nuance, here is a nice online tutorial that explains the basic functionality of I2C. Device addresses are 7-bit and the 8-bit is the Read/Write bit (0 right, 1 read).

http://embedded-lab.com/blog/lab-14-int ... unication/

The example code shows how to manage the I2C peripheral. You will need to update the device address, ack/nack sequence and register addresses based on how you are controlling the device. Don't forget you will need pull up resistors on these lines.

I have helped others with this in the past. If you have access to the source code, it should be straight forward to figure out what the arduino code is trying to do. Often you have to rewrite it since Arduino SPI libraries (along with everything else) are different, but with Mikroe's libraries it sh...

First I think you should give it a proper try by referencing the help file and using the examples. You only need to initialize once so why are you putting that in the loop? Also, the init needs a speed. Like I said, start with the help file.

Not sure I am going to help much, but have you tried to see what you get from the debugger on the buffer? Could it be that you don't have all numerics in the field and that it is seeing a LF and CR in the variable?

Can you share your schematic? I would make sure you have a pull up resistor (~4.7k) on the SDA and SCL line. Additionally if you have access to an o-scope can you see a pulse when you write? The MCU will freeze if it doesn't see an ACK from the ADC and wait for ever until it sees it. You can built a...

Can you send the proteus file? I would like to try a few things before I can recommend the definitive fix. You may need to consider pull down resistors on the M1 and M2 line. Also, make sure your Port E is configured right in the compiler's project setting.

Let me take a crack at this. First you are initializing I2C to run at 100Hz, which is a bit on the slow end. If you want 100KHz, you need to make this I2C1_Init(100000) To Write Data to I2C those sequence below is correct. I2C1_Start() I2C1_Write(WriteADCAdd) ' Send 7-bit address and 1-bit Write com...

The soft I2C library is built into the Mikroe Editor.