Microusb-UART on NRF51822 Custom Board

[Li]

Hi All,

I am working a custom board for 51822. We have wired the UART RX/TX pins to a microusb connector (No RXD/TXD pins wired). The problem is once we connect it to PC, it doesn't seem to be recognized as a valid USB device. My guess is i need a special driver for it. I've tried several different drivers (CP210X, profilic) but none of them works. In other posts, I saw people were talking about using special adapter chips. Since the board has been made (difficult to fit a new chip on). Is their any other solution that I probably can try?

Many thanks for your advices.

Cheers

L.

[Knut Eldhuset]

Hi,

Really, you should follow the advice from cocoa. That said, you might be able to get something working with software. The LemcUSB project provides some USB capabilities on a Cortex M0+ in pure software. It requires a 24MHz clock frequency as provided, but it could be possible to optimize it to run on the nRF51822 at 16MHz. No guarantees, though.

BR

[cocoa]

Very interesting link to LemcUSB. Thank you.