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USB Device interrupt status register - LPC2478

Hello,

Using a LPC2478, I'm trying to maintain a CDC connection with a host. But at a certain point, the RTX USB tasks are no longer signaled because both the EP_SLOW and EP_FAST bits of USBDevIntSt register remain 0 (the register having the value 0xF1). Do you know how this register is set? Can this failure be attributed to the device driver on the host?

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