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Is your blackfin set up for the right data interface?
Okay so look at the facts; Your USB RX is able to receive characters, your camera is receiving and transmitting data, but your USB RX doesn't like the data it's receiving from the camera. This sounds like it's either a level problem, or a baud rate issue. Or, your USB RX hardware is looking for an 'INVERTED' RS-232 signal.
You must be sure your camera is configured to use the right communication protocol. If your USB board is looking for RS-232 data but your camera is sending I2C data, then the USB board will never understand the data it's receiving.
Do you have a link to the data sheet for your blackfin camera? If I could see the data sheet I can be much more help.
There are wiring diagrams for both 5V and 3.3V operation. Are you set up for 3.3v correctly?
Here is the picture I captured from the oscilloscope when I sent “V”:I think it is a data signal …
Can I get an I2C signal from a UART port?
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