#include <cdc-acm.h>#include <cdc.h>#include <usb-proto.h>#include <stdio.h>static unsigned inthandle_cdc_acm_requests(){  printf("CDC request %02x %02x\n", usb_setup_buffer.bmRequestType, usb_setup_buffer.bRequest);  switch(usb_setup_buffer.bmRequestType) {  case 0x21: /* CDC interface OUT requests */    /* Check if it's the right interface */    if (usb_setup_buffer.wIndex != 0) return 0;    switch(usb_setup_buffer.bRequest) {    case SET_CONTROL_LINE_STATE:      if (usb_setup_buffer.wValue & 0x02) {	puts("Carrier on");      } else {	puts("Carrier off");      }      if (usb_setup_buffer.wValue & 0x01) {	puts("DTE on");      } else {	puts("DTE off");      }      usb_send_ctrl_status();      return 1;    case SEND_ENCAPSULATED_COMMAND:      printf("Got CDC command: length %d\n", usb_ctrl_data_len);      usb_send_ctrl_status();      return 1;             case SET_LINE_CODING:      if (usb_ctrl_data_len == 7) {	static const char parity_char[] = {'N', 'O', 'E', 'M', 'S'};	static const char *stop_bits_str[] = {"1","1.5","2"};	const struct usb_cdc_line_coding *coding =	  (const struct usb_cdc_line_coding *)usb_ctrl_data_buffer;	char parity = ((coding->bParityType > 4)		       ? '?' : parity_char[coding->bParityType]);	const char *stop_bits = ((coding->bCharFormat > 2)				 ? "?" : stop_bits_str[coding->bCharFormat]);	printf("Got CDC line coding: %ld/%d/%c/%s\n",	       coding->dwDTERate, coding->bDataBits, parity, stop_bits);	usb_send_ctrl_status();      } else {	return 0;      }      return 1;    }    break;  case 0xa1: /* CDC interface IN requests */    if (usb_setup_buffer.wIndex != 0) return 0;    switch(usb_setup_buffer.bRequest) {    case GET_ENCAPSULATED_RESPONSE:      printf("CDC response");      usb_send_ctrl_status();      return 1;    }  }  return 0;}static const struct USBRequestHandler cdc_acm_request_handler =  {    0x21, 0x7f,    0x00, 0x00,    handle_cdc_acm_requests  };static struct USBRequestHandlerHook cdc_acm_request_hook =  {    NULL,    &cdc_acm_request_handler  };voidusb_cdc_acm_setup(){  usb_register_request_handler(&cdc_acm_request_hook);}