Arduino USB Keyboard = Arduino UNO + USB Host shield + USB keyboard

這次把做好許久的Arduino USB keyboard的做法及程式公開, 讓想學如何用USB host連接 keyboard的網友做參考(有不少網友寫mail來希望可以post出來).

DIY的材料:

1. Arduino UNO or compatible

2. USB host shield

3. USB keyboard

參考連接圖:

程式如下:  完整程式 (sketch)

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#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>

class KbdRptParser : public KeyboardReportParser

{

        void PrintKey(uint8_t mod, uint8_t key);

        

protected:

virtual void OnKeyDown (uint8_t mod, uint8_t key);

virtual void OnKeyUp (uint8_t mod, uint8_t key);

virtual void OnKeyPressed(uint8_t key);

};

USB     Usb;

HIDBoot<HID_PROTOCOL_KEYBOARD>    Keyboard(&Usb);

uint32_t next_time;

KbdRptParser Prs;

void KbdRptParser::PrintKey(uint8_t m, uint8_t key)

{

    MODIFIERKEYS mod;

    *((uint8_t*)&mod) = m;

    Serial.print((mod.bmLeftCtrl   == 1) ? "C" : " ");

    Serial.print((mod.bmLeftShift  == 1) ? "S" : " ");

    Serial.print((mod.bmLeftAlt    == 1) ? "A" : " ");

    Serial.print((mod.bmLeftGUI    == 1) ? "G" : " ");

    

    Serial.print(" >");

    PrintHex<uint8_t>(key);

    Serial.print("< ");

    Serial.print((mod.bmRightCtrl   == 1) ? "C" : " ");

    Serial.print((mod.bmRightShift  == 1) ? "S" : " ");

    Serial.print((mod.bmRightAlt    == 1) ? "A" : " ");

    Serial.println((mod.bmRightGUI    == 1) ? "G" : " ");

};

void KbdRptParser::OnKeyDown(uint8_t mod, uint8_t key)

{

    Serial.print("DN ");

    PrintKey(mod, key);

    uint8_t c = OemToAscii(mod, key);

    

    if (c)

        OnKeyPressed(c);

}

void KbdRptParser::OnKeyUp(uint8_t mod, uint8_t key)

{

    Serial.print("UP ");

    PrintKey(mod, key);

}

void KbdRptParser::OnKeyPressed(uint8_t key)

{

  int moveSteps;

    Serial.print("ASCII: ");

    Serial.println((char)key);

}

void setup()

{

    Serial.begin(115200);

    Serial.println("Start.......");

    if (Usb.Init() == -1)

        Serial.println("Usb initial falied");

      

    delay( 200 );

  

    next_time = millis() + 5000;

  

    Keyboard.SetReportParser(0, (HIDReportParser*)&Prs);

}

void loop()

{

    Usb.Task();

}

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Video(control stepper motors) : http://www.youtube.com/watch?v=z4d_EpXNxgo

更多影片請看: http://www.youtube.com/user/sinocgtchen

部落格 : http://sinocgtchen.blogspot.com

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