ZFaisal
September 1, 2016, 10:45am
1
Hi, i am using a 'barcode scanner project'. for that; using code from this site .
following is my code:
#include <LiquidCrystal.h>
#include <avr/pgmspace.h>
#include <Usb.h>
#include <usbhub.h>
#include <avr/pgmspace.h>
#include <hidboot.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();
}
this code is working fine; but on display the varriable Key which is a type uint8_t; returning ASCII value.
for example, while reading barcode of
i tried using following code... but didn't work.
uint8_t key[700] = {0};
String str = (char*)key;
lcd.print( str );
appreciate if anyone can help.
Thanks in advance.
Cheers,
Faisal
system
September 1, 2016, 10:49am
2
48 48 50 48 52 56 48 52 56 48 53 49 48 52 57 48 53 48 19 48 48 51
'0' '0' '2' '0' '4' '8' '0' '4' '8' '0' '7' '1' '0' '4' '9' and so on
Regarding your 'millis()'-based timing. Your That website example's method will lead to errors when 'millis()' rolls over.
if(millis() - prevMillis >= period)
{
//Do something here
prevMillis += period;
}
J-M-L
September 1, 2016, 11:38am
4
try
lcd.print((char) key );
the compiler sees you are passing a number, not a character to the print function, so decides to call the function that prints the value of that number rather than an ASCII value. if the signature detects it's a character that is being passed, then it will print the ASCII character corresponding to the value.
a simple example to prove this
void setup() {
uint8_t c = 50; // this is the value of character '2' in ASCII
Serial.begin(115200);
Serial.println(c);
Serial.println((char)c);
}
void loop() {}
output in the console
[color=red]50[/color]
[color=blue]2[/color]
50 is the value which represents the ASCII char '2'
TGG3
September 1, 2016, 12:32pm
5
void setup() {
uint8_t c = 50; // this is the value of character '2' in ASCII
Serial.begin(115200);
Serial.println(c-48);//prints the value of c - 48 = 2
}
system
September 1, 2016, 12:33pm
6
Serial.println(c - '0');
...is much more intuitive.
J-M-L
September 1, 2016, 12:37pm
7
TGG3:
void setup() {
uint8_t c = 50; // this is the value of character '2' in ASCII
i would not recommend that... what will happen when he tries to scan
ZFaisal
September 1, 2016, 12:44pm
8
Hi J-M-L,
(Char)Key has successfully converted ASCII to Text.
thanks a lot.
now need to solve receiving correct data. still getting junk from barcode reader.
ie. from barcode value 00312;i suppose to get 048 048 051 049 050. instead i am receiving 48 48 50 48 52 56 48 52 56 48 53 49 48 52 57 48 53 48 19 48 48 51.
maybe need to open another thread for this issue.
thanks again.
Z.Faisal
ZFaisal
September 1, 2016, 12:59pm
10
Ok then. i am continuing discussion on this thread.
So, can anyone help me find what i am doing wrong here and how to resolve?
please note that my Scanner is connected with a USB shield.
and with a keyboard connected to it gives a perfect result (no junk).
regards
Faisal
system
September 1, 2016, 1:09pm
11
Why not post an image of the barcode?
J-M-L
September 1, 2016, 1:35pm
12
ZFaisal:
need info on your specific scanner model and possibly datasheet
And if you connect that same scanner to a PC and scan the same barcode (into notepad) what is the output?
ZFaisal
September 1, 2016, 7:16pm
15
J-M-L:
My scanner info is as follows:
Brand : Honeywell
datasheet :
Device descriptor:
Descriptor Length: 12
Descriptor type: 01
USB version: 0110
Device class: 00
Device Subclass: 00
Device Protocol: 00
Max.packet size: 08
Vendor ID: 0C2E
Product ID: 0200
Revision ID: 5881
Mfg.string index: 01
Prod.string index: 02
Serial number index: 00
Number of conf.: 01
Configuration descriptor:
Total length: 0022
Num.intf: 01
Conf.value: 01
Conf.string: 03
Attr.: 80
Max.pwr: 96
Interface descriptor:
Intf.number: 00
Alt.: 00
Endpoints: 01
Intf. Class: 03
Intf. Subclass: 01
Intf. Protocol: 01
Intf.string: 00
Unknown descriptor:
Length: 09
Type: 21
Contents: 11010001223F000705
Endpoint descriptor:
Endpoint address: 81
Attr.: 03
Max.pkt size: 0008
Polling interval: 0A
Addr:1(0.0.1)
i have used USB_Desc example from USB Host library.
note that at Line 29; its
Intf. Class: 03
that means it can boot as keyboard. Doesn't require any driver.
---------- ***
septillion:
connecting on my notebook and scanning same barcode gives output on a notepad is :
00312
Regards
Z.Faisal
J-M-L
September 1, 2016, 8:33pm
16
can you share the code you use on arduino again? did you implement the suggested modifications?
J-M-L
September 2, 2016, 7:42am
18
How is the barcode scanner configured? The Eclipse MS5145 Have TONS of options to do different things.
ZFaisal
September 4, 2016, 6:28am
19
J-M-L:
For a true HID Barcode scanner; does it need special configuration?
regards
Z.Faisal
my complete code is here:
/*
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 <Usb.h>
#include <usbhub.h>
#include <avr/pgmspace.h>
#include <hidboot.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( (char)key );
// uint8_t key[700] = {0};
// String str = ((char)key);
Serial.println((char)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();
}
J-M-L
September 4, 2016, 6:45am
20
For a true HID Barcode scanner; does it need special configuration?
it should not but wondering if you did set it up with a special mode.
Your code prints multiple things per character
Serial.println( key );
...
Serial.println((char)key);
you just need one Serial.print((char) key );Serial.print(' ');
Also your watchdog thingy - why do you clear the LCD if you did not receive a char in the last 200ms ? Is that what you want?
