'HID_PROTOCOL_KEYBOARD' was not declared in this scope

Projects Programming
1

I have working on my project to connect barcode scanner to USB HOST SHIELD.
I use this https://www.circuitsathome.com/mcu/connecting-barcode-scanner-arduino-usb-host-shield/ as a tutorial.

But I got error message when compiled.

'HID_PROTOCOL_KEYBOARD' was not declared in this scope

and I use this library

Here's my code

/*
 
Portable barcode scanner. Uses USB HID barcode scanner, Arduino Board, USB Host Shield and HD44780-compatible LCD display
 
  The circuit:
 * LCD RS pin to digital pin 7
 * LCD Enable pin to digital pin 6
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)
 
*/
 
#include <LiquidCrystal.h>
#include <avr/pgmspace.h>
 
//#include <avrpins.h>
//#include <max3421e.h>
//#include <usbhost.h>
//#include <usb_ch9.h>
#include <Usb.h>
#include <usbhub.h>
#include <avr/pgmspace.h>
//#include <address.h>
#include <hidboot.h>
 
//#include <printhex.h>
//#include <message.h>
//#include <hexdump.h>
//#include <parsetools.h>
 
#define DISPLAY_WIDTH 16
 
// initialize the LCD library with the numbers of the interface pins
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
 
USB     Usb;
USBHub     Hub(&Usb);
HIDBoot<HID_PROTOCOL_KEYBOARD>    Keyboard(&Usb);
 
class KbdRptParser : public KeyboardReportParser
{
 
protected:
  virtual void OnKeyDown  (uint8_t mod, uint8_t key);
  virtual void OnKeyPressed(uint8_t key);
};
 
void KbdRptParser::OnKeyDown(uint8_t mod, uint8_t key)  
{
    uint8_t c = OemToAscii(mod, key);
 
    if (c)
        OnKeyPressed(c);
}
 
/* what to do when symbol arrives */
void KbdRptParser::OnKeyPressed(uint8_t key)  
{
static uint32_t next_time = 0;      //watchdog
static uint8_t current_cursor = 0;  //tracks current cursor position  
 
    if( millis() > next_time ) {
      lcd.clear();
      current_cursor = 0;
      delay( 5 );  //LCD-specific 
      lcd.setCursor( 0,0 );
    }//if( millis() > next_time ...
 
    next_time = millis() + 200;  //reset watchdog
 
    if( current_cursor++ == ( DISPLAY_WIDTH + 1 )) {  //switch to second line if cursor outside the screen
      lcd.setCursor( 0,1 );
    }
 
    Serial.println( key );
    lcd.print( key );
};
 
KbdRptParser Prs;
 
void setup()
{
    Serial.begin( 115200 );
    Serial.println("Start");
 
    if (Usb.Init() == -1) {
        Serial.println("OSC did not start.");
    }
 
    delay( 200 );
 
    Keyboard.SetReportParser(0, (HIDReportParser*)&Prs);
    // set up the LCD's number of columns and rows: 
    lcd.begin(DISPLAY_WIDTH, 2);
    lcd.clear();
    lcd.noAutoscroll();
    lcd.print("Ready");
    delay( 200 );
}
 
void loop()
{
  Usb.Task();
}

I really need help how to solve this problem.

Thank you very much

2

Why did you comment out the include of usbhost.h and usb_ch9.h? Those were not commented out in the code you pointed to. I suspect that is your problem.

3

johnwasser:
Why did you comment out the include of usbhost.h and usb_ch9.h? Those were not commented out in the code you pointed to. I suspect that is your problem.

hi johnwasser,
If I don't comment those 2, it will be error message like this

In file included from D:\Works\GUT\Arduino\barcode_scanner\barcode_scanner.ino:24:0:

D:\Works\GUT\Arduino\libraries\USB_Host_Shield_20/usbhost.h:21:2: error: #error "Never include usbhost.h directly; include Usb.h instead"

 #error "Never include usbhost.h directly; include Usb.h instead"

  ^

In file included from D:\Works\GUT\Arduino\barcode_scanner\barcode_scanner.ino:25:0:

D:\Works\GUT\Arduino\libraries\USB_Host_Shield_20/usb_ch9.h:19:2: error: #error "Never include usb_ch9.h directly; include Usb.h instead"

 #error "Never include usb_ch9.h directly; include Usb.h instead"
4

OK. That makes sense. It also means that the library has been changed significantly since the example you copied was written. Now you have to look for a more recent example to see how the library usage has changed. Maybe there is a new include file you are supposed to use or the name of HID_PROTOCOL_KEYBOARD was changed slightly to fit a new naming convention. Since the failing line is "HIDBoot<HID_PROTOCOL_KEYBOARD> Keyboard(&Usb);" I would look in hidboot.h to see if such things were defined in there.

5

johnwasser:
OK. That makes sense. It also means that the library has been changed significantly since the example you copied was written. Now you have to look for a more recent example to see how the library usage has changed. Maybe there is a new include file you are supposed to use or the name of HID_PROTOCOL_KEYBOARD was changed slightly to fit a new naming convention. Since the failing line is "HIDBoot<HID_PROTOCOL_KEYBOARD> Keyboard(&Usb);"I would look in hidboot.h to see if such things were defined in there.

Thank you very much johnwasser.
Problem Solved, You saved my day.

6

Hello, I'm with the same problem as you. How did you solve it?