Diff: mbedGC/WiiClassicControllerReader.cpp

Revision:

0:011be8250218

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbedGC/WiiClassicControllerReader.cpp	Sat Apr 02 23:23:07 2011 +0000
@@ -0,0 +1,122 @@
+/*
+* 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;
+
+}
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