Hello everybody!
I bought a USB host shield last week and i am trying to connect a barcode scanner.
Luckily for me there are a lot of tutorials in the internet.
The barcode scanner is currently working properly with a some different barcode scanners.
The arduino outputs the code that i scan on the serial monitor.
But i would like to make a stand alone device. Because i can also use the barcode scanner directly connected to my computer.
I tried adding LCD support to the code. But i can't get the data to show op correctly on my LCD.
The data does show up correct on the serial monitor.
The code works without the LCD.
And the LCD works without the rest of the code.
#include <usbhid.h>
#include <usbhub.h>
#include <hiduniversal.h>
#include <hidboot.h>
#include <SPI.h>
#include <LiquidCrystal.h>
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
class MyParser : public HIDReportParser {
public:
MyParser();
void Parse(USBHID *hid, bool is_rpt_id, uint8_t len, uint8_t *buf);
protected:
uint8_t KeyToAscii(bool upper, uint8_t mod, uint8_t key);
virtual void OnKeyScanned(bool upper, uint8_t mod, uint8_t key);
virtual void OnScanFinished();
};
MyParser::MyParser() {}
void MyParser::Parse(USBHID *hid, bool is_rpt_id, uint8_t len, uint8_t *buf) {
// If error or empty, return
if (buf[2] == 1 || buf[2] == 0) return;
for (uint8_t i = 7; i >= 2; i--) {
// If empty, skip
if (buf[i] == 0) continue;
// If enter signal emitted, scan finished
if (buf[i] == UHS_HID_BOOT_KEY_ENTER) {
OnScanFinished();
}
// If not, continue normally
else {
// If bit position not in 2, it's uppercase words
OnKeyScanned(i > 2, buf, buf[i]);
}
return;
}
}
uint8_t MyParser::KeyToAscii(bool upper, uint8_t mod, uint8_t key) {
// Letters
if (VALUE_WITHIN(key, 0x04, 0x1d)) {
if (upper) return (key - 4 + 'A');
else return (key - 4 + 'a');
}
// Numbers
else if (VALUE_WITHIN(key, 0x1e, 0x27)) {
return ((key == UHS_HID_BOOT_KEY_ZERO) ? '0' : key - 0x1e + '1');
}
return 0;
}
void MyParser::OnKeyScanned(bool upper, uint8_t mod, uint8_t key) {
delay(250);
uint8_t ascii = KeyToAscii(upper, mod, key);
Serial.print((char)ascii);
lcd.print((char)ascii);
}
void MyParser::OnScanFinished() {
Serial.println(" - Finished");
}
USB Usb;
USBHub Hub(&Usb);
HIDUniversal Hid(&Usb);
MyParser Parser;
void setup() {
lcd.begin(16, 2);
Serial.begin( 115200 );
Serial.println("Start");
//lcd.print("Start");
if (Usb.Init() == -1) {
Serial.println("OSC did not start.");
}
delay( 200 );
Hid.SetReportParser(0, &Parser);
}
void loop() {
Usb.Task();
}