FT260 External Interrupt: Not working

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asmeerasif22

Joined May 14, 2025
1
I am currently working with the FT260 chip on the UMFT260EV1A module. It is I2C to USB bridge that uses HID protocol to communicate with the host. I have established connection with the chip and am also able to communicate with an I2C device through the FT260.

What I am struggling with is the External interrupt feature. As I understand, when the GPIO3 pin is configured as an external interrupt source and it detects a trigger, it is supposed to generate an interrupt report (with report ID 0xB1) and send it to the host device via at the interrupt IN pipe. When I read from the device, there is no such report. What might be causing this and how can I fix it? Any help in this regard would be appreciated.
 
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