USB Barcode Reader

Using Arduino Programming Questions
#1

Hi All,

I’m trying to get the below code working on a Uno with a Keyes USB shield. I’m getting the following errors with the line ‘HIDBoot<HID_PROTOCOL_KEYBOARD> Keyboard(&Usb);’

BarcodeScanner:19: error: expected constructor, destructor, or type conversion before ‘<’ token
BarcodeScanner:22: error: expected class-name before ‘{’ token
BarcodeScanner.ino: In member function ‘virtual void KbdRptParser::OnKeyDown(uint8_t, uint8_t)’:
BarcodeScanner:31: error: ‘OemToAscii’ was not declared in this scope
BarcodeScanner.ino: In function ‘void setup()’:
BarcodeScanner:73: error: ‘Keyboard’ was not declared in this scope
BarcodeScanner:73: error: ‘HIDReportParser’ was not declared in this scope
BarcodeScanner:73: error: expected primary-expression before ‘)’ token

I’d appreciate some assistance!

Thanks.

/*
Portable barcode scanner. Uses USB HID barcode scanner, Arduino Board, USB Host Shield and I2C LCD display
Original code from http://www.circuitsathome.com/mcu/connecting-barcode-scanner-arduino-usb-host-shield
Written by Oleg Mazurov
Mods by Shane Frost 20 Aug 2014
*/
 
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <avr/pgmspace.h>
#include <Usb.h>
 
#define DISPLAY_WIDTH 16
 
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);  // Set the LCD I2C address
 
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();
}
#2