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cc2540 usb connection

Other Parts Discussed in Thread: CC2540

Hello,

I'm developing a custom hardware with cc2540. I've made a prototype based on the schematic of usb-dongle from the mini development kit. I've tried to reprogram it with the dongle firmware. I can make LED blinking, use ADC, but have problems with usb - it doesn't work at all, device doesn't pop up on the pc.

Could you provide me with a hint where my error could be?

 

Thanks in advance,

Yury