File content as of revision 2:da81fd97aa86:

/*
* WiiClassicControllerReader. A program allowing the output of one or two
* Wii Classic Controllers to be read via I2C and decoded for use, using the mbed 
* microcontroller and its associated libraries.
*
* Written by Alfredo Guerrero <alfredog83@gmail.com> for the mbedGC open-source 
* game console <http://www.mbedgc.com>. Based on the original code for
* the WiiNunchuckReader written by Petras Saduikis <petras@petras.co.uk>.
*
* This file is part of WiiClassicControllerReader.
*
* WiiClassicControllerReader is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 
* WiiClassicControllerReader is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You can find a copy of the GNU General Public License at <http://www.gnu.org/licenses/>.
*/

#include "WiiClassicControllerReader.h"

// constructor
WiiClassicControllerReader::WiiClassicControllerReader(PinName sda, PinName scl) : 
    controllerPort(sda, scl),
    ljoyX(0), ljoyY(0), rjoyX(0), rjoyY(0), buttonX(0), buttonY(0), buttonA(0),
    buttonB(0), buttonZL(0), buttonZR(0), buttonLT(0), buttonRT(0), buttonLC(0), 
    buttonRC(0), buttonHOME(0), buttonSELECT(0), buttonSTART(0), buttonDU(0), 
    buttonDD(0), buttonDL(0), buttonDR(0), controllerInit(false)
{
}

void WiiClassicControllerReader::RequestRead()
{
    // don't expect client to remember to send an init to the nunchuck
    // so do it for them here
    if (!controllerInit)
    {
        controllerInit = ControllerInit();
    }
    
    if (controllerInit)    // don't start reading if init failed
    {
        if (ControllerRead())
        {
            // only decode successful reads
            ControllerDecode();
        }
    }
}

bool WiiClassicControllerReader::ControllerInit()
{
    bool success = false;
    
    const BYTE cmd[] = {CONTROLLER_REGADDR, 0x00};    
    if (I2C_OK == controllerPort.write(CONTROLLER_ADDR, (const char*)cmd, sizeof(cmd))) success = true;
    
    return success;
}

bool WiiClassicControllerReader::ControllerRead()
{
    bool success = false;
    
    // write the address we want to read from
    const BYTE cmd[] = {0x00};
    if (I2C_OK ==  controllerPort.write(CONTROLLER_ADDR, (const char*)cmd, sizeof(cmd)))
    {
        // the Wii Classic Controller is non-standard I2C
        // and can't manage setting the read address and immediately supplying the data
        // so wait a bit
        wait(I2C_READ_DELAY);
        
        if (I2C_OK == controllerPort.read(CONTROLLER_ADDR, readBuf, sizeof(readBuf))) success = true;
    }
    
    return success;
}

void WiiClassicControllerReader::ControllerDecode()
{
    ljoyX = (int)readBuf[0] & MASK_LX;
    ljoyY = (int)readBuf[1] & MASK_LY;
    rjoyY = (int)readBuf[2] & MASK_RY;
    buttonRT = (int)readBuf[3] & MASK_RT;
    buttonRC = (int)readBuf[4] & MASK_RC_DL;
    buttonSTART = (int)readBuf[4] & MASK_BSTART_ZR;
    buttonHOME = (int)readBuf[4] & MASK_BHOME_X;
    buttonSELECT = (int)readBuf[4] & MASK_BSELECT_A;
    buttonLC = (int)readBuf[4] & MASK_LC_Y;
    buttonDD = (int)readBuf[4] & MASK_BDD_B;
    buttonDR = (int)readBuf[4] & MASK_BDR_ZL;
    buttonDU = (int)readBuf[5] & MASK_BDU;
    buttonDL = (int)readBuf[5] & MASK_RC_DL;
    buttonZR = (int)readBuf[5] & MASK_BSTART_ZR;
    buttonX = (int)readBuf[5] & MASK_BHOME_X;
    buttonA = (int)readBuf[5] & MASK_BSELECT_A;
    buttonY = (int)readBuf[5] & MASK_LC_Y;
    buttonB = (int)readBuf[5] & MASK_BDD_B;
    buttonZL = (int)readBuf[5] & MASK_BDR_ZL;
    
    // the RjoyX axis and LT values are really 5 bit values
    // so shift the 2 bit values read from the controller
    // 3 bits to the right
    rjoyX = ( (int)readBuf[0] & MASK_RX34 ) << 3;
    buttonLT = ( (int)readBuf[2] & MASK_LT34 ) << 3;
    
    // and for each value add bit 2, bit 1, and bit 0
    // as required    
    if (readBuf[2] & MASK_BDR_ZL) rjoyX += 1;
    if (readBuf[1] & MASK_BDD_B) rjoyX += 2;
    if (readBuf[1] & MASK_BDR_ZL) rjoyX += 4;
    if (readBuf[3] & MASK_LC_Y) buttonLT += 1;
    if (readBuf[3] & MASK_BDD_B) buttonLT += 2;
    if (readBuf[3] & MASK_BDR_ZL) buttonLT += 4;

}