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USB-TO-GPIO: GPIO control through a .dll

Christiaan Behr
Prodigy 20 points

Part Number: USB-TO-GPIO

Hi all

We have been using the https://www.ti.com/tool/USB-TO-GPIO on a number of projects with respect to the GPIO outputs and the I2C.

We have a new project that we want to use the input function of the device.

We are struggling with reading the input as it seems the device is set to output even when a reading command is sent.

I have used the USB Adapter Driver.dll and the TIDP.SAA2.dll files to test this.

Starting with the pin (lest say GPIO7) set to 0 I measure 0V on the output. I then force the pin high and I see a 3V3 on the scope but o through software. However if I measure on the processor side of the 33ohm resistor on the PCB I only measure 1V5 using indicating to me that the processor is trying to pull the pin low. But the documentation state that there is a pull-up not a pull-down on those pins.

I have used the SMBus/I2C/SAA Tool with the exact same results. I have tried firmware version 1.0.11and 1.0.14

Any advice?

Regards