Can you please post your complete project so that we all can have a look at all of your settings. To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file. Are you using a CY8CKIT-059 or something different?
Confirm that the I2C address of BNO is 0x4b and not 0x4a.
Most of the APIs (except those for reading a byte) return a status byte which, when non-zero indicate an error condition. Start checking that at Beginning with the SendStart() API
The address is set to 0x4B! I've found 2 other issues that have taken me a few steps closer:
1. My logic converter was misbehaving: since I'm using the Kitprog to program and view my UART output [5V logic] and the BNO is 3.3V logic I was using a logic converter that wasn't behaving properly-- Question is there a way of separating the kitprog from the actual PSOC and continue to be able to program it? I tried plugging in directly from the microUSB on the kit and that didn't work
2. I2C_MasterWriteByte() and I2C_MasterReadByte() don't wait until transfers are complete! So I added a few 100 ms delays sprinkled around my functions.
Now I am able to reach the end of the start sequence. However, I'm still not getting the data on my monitor.
Inching closer though!
Thanks for your response Bob
Please change the drive modes of the I2C pins in your project to 'Open Drain Drives Low' and also ensure that you have connected an external pull up resistor (2k - 10k) for both SDA and SCL lines. This might fix your issue.
To answer your question regarding separating KitProg and PSoC, yes, you can use a MiniProg to program your device instead of the KitProg.
Update: Drive mode of I2C pin should be 'Open Drain Drives Low'
Thanks and Regards,
Rakshith M B