usbstack/usb_serial.c: In function ‘sendout’:
usbstack/usb_serial.c:73: error: ‘usb_mem’ undeclared (first use in this function)
usbstack/usb_serial.c:73: error: (Each undeclared identifier is reported only once
usbstack/usb_serial.c:73: error: for each function it appears in.)
usbstack/usb_serial.c: In function ‘usb_serial_init_connection’:
usbstack/usb_serial.c:111: error: ‘_receive_buffer’ undeclared (first use in this function)
usbstack/usb_serial.c: In function ‘usb_serial_send’:
usbstack/usb_serial.c:151: error: ‘usb_mem’ undeclared (first use in this function)
usbstack/usb_serial.c: In function ‘usb_serial_transfer_complete’:
usbstack/usb_serial.c:188: error: ‘_receive_buffer’ undeclared (first use in this function)