I'm using a USB-to-gpio Adapter to interface with the I2C signals on the 24 pin port on the side of a Pico 2 DLP projector.
From
http://focus.ti.com/docs/toolsw/folders/print/usb-to-gpio.html
I downloaded
Reference GUIs and Libraries for Eval and Usage of the USB Inteface Adapter (zip 272 KB)
I extracted the files and opened the file USB SAA GUI.exe which opens as the USB Adapter EVM.
I followed the instructions for connecting the Adapter. The green LED lights up when the adapter is connected
to the USB port. Then I turn on power to the Pico 2.
In the text boxes in the I2C section 36 is entered as the device address,
12 entered as the command number and 00 entered as the data.
Clicking on Send results in "ERROR". No matter what numbers are entered in the boxes,
the always result is always "ERROR".
This command should turn the green LED off. The pico 2 display output does not change.
A line at the bottom of the Adapter EVM screen says "adapter not attached"
1) Is it possible the USB Adapter is not communicating with the Pico 2?
2) Is there any way to set the I2C baud rate or is this automatically set internally by interaction between the two devices?
3) Is there an I2C device that could be used to test the I2C capability of the USB adapter?
4) Is there any other possibility that might be the problem?