static const char *usb_strings[] = {  //  List of all strings. First entry has string descriptor index 1.
    "Devanarchy",              //  Name of USB Manufacturer
    "DAPBoot DFU Bootloader",  //  Name of USB Product
    serial_number,             //  Serial number
    "DAPBoot DFU",             //  Name of DFU interface
    "Blue Pill MSC",           //  Name of MSC interface
    "Blue Pill Serial Port",   //  Name of Serial Port
    "Blue Pill COMM",          //  Name of CDC ACM interface
    "Blue Pill DATA",          //  Name of CDC Data interface
};