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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Uhv
Ok, you are right. There is transistor, that connects the USP_DP via 1k5 resistor to +3,3V, if PC13 is LOW. When the board is restart, there is HIGH on PC13 and system doesn't see on USB the Espruino. I have reset PC13 and then computer find the board.
But this didn't give the result: the program with "compiled" function hangs...
@TrapperBob had same situation (post #38 in this theme), I think so :-)
PS. I have connected those base resistor of Q1 from PC13 to ground, and now the USB is seen always. And additional I have the free port PC13 :-)