J.P. Armstrong / Mbed 2 deprecated mbedgc_1

The original snake game for the mbedgc

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Fork of SimpleLib_03272011 by J.P. Armstrong

mbedGC/WiiClassicControllerReader.cpp@2:da81fd97aa86, 2013-08-22 (annotated)

Committer:
jp
Date:
Thu Aug 22 00:28:15 2013 +0000
Revision:
2:da81fd97aa86
Parent:
0:011be8250218 
getting it working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jp 0:011be8250218 1 /*
jp 0:011be8250218 2 * WiiClassicControllerReader. A program allowing the output of one or two
jp 0:011be8250218 3 * Wii Classic Controllers to be read via I2C and decoded for use, using the mbed
jp 0:011be8250218 4 * microcontroller and its associated libraries.
jp 0:011be8250218 5 *
jp 0:011be8250218 6 * Written by Alfredo Guerrero <alfredog83@gmail.com> for the mbedGC open-source
jp 0:011be8250218 7 * game console <http://www.mbedgc.com>. Based on the original code for
jp 0:011be8250218 8 * the WiiNunchuckReader written by Petras Saduikis <petras@petras.co.uk>.
jp 0:011be8250218 9 *
jp 0:011be8250218 10 * This file is part of WiiClassicControllerReader.
jp 0:011be8250218 11 *
jp 0:011be8250218 12 * WiiClassicControllerReader is free software: you can redistribute it and/or modify
jp 0:011be8250218 13 * it under the terms of the GNU General Public License as published by
jp 0:011be8250218 14 * the Free Software Foundation, either version 3 of the License, or
jp 0:011be8250218 15 * (at your option) any later version.
jp 0:011be8250218 16 *
jp 0:011be8250218 17 * WiiClassicControllerReader is distributed in the hope that it will be useful,
jp 0:011be8250218 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
jp 0:011be8250218 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
jp 0:011be8250218 20 * GNU General Public License for more details.
jp 0:011be8250218 21 *
jp 0:011be8250218 22 * You can find a copy of the GNU General Public License at <http://www.gnu.org/licenses/>.
jp 0:011be8250218 23 */
jp 0:011be8250218 24
jp 0:011be8250218 25 #include "WiiClassicControllerReader.h"
jp 0:011be8250218 26
jp 0:011be8250218 27 // constructor
jp 0:011be8250218 28 WiiClassicControllerReader::WiiClassicControllerReader(PinName sda, PinName scl) :
jp 0:011be8250218 29 controllerPort(sda, scl),
jp 0:011be8250218 30 ljoyX(0), ljoyY(0), rjoyX(0), rjoyY(0), buttonX(0), buttonY(0), buttonA(0),
jp 0:011be8250218 31 buttonB(0), buttonZL(0), buttonZR(0), buttonLT(0), buttonRT(0), buttonLC(0),
jp 0:011be8250218 32 buttonRC(0), buttonHOME(0), buttonSELECT(0), buttonSTART(0), buttonDU(0),
jp 0:011be8250218 33 buttonDD(0), buttonDL(0), buttonDR(0), controllerInit(false)
jp 0:011be8250218 34 {
jp 0:011be8250218 35 }
jp 0:011be8250218 36
jp 0:011be8250218 37 void WiiClassicControllerReader::RequestRead()
jp 0:011be8250218 38 {
jp 0:011be8250218 39 // don't expect client to remember to send an init to the nunchuck
jp 0:011be8250218 40 // so do it for them here
jp 0:011be8250218 41 if (!controllerInit)
jp 0:011be8250218 42 {
jp 0:011be8250218 43 controllerInit = ControllerInit();
jp 0:011be8250218 44 }
jp 0:011be8250218 45
jp 0:011be8250218 46 if (controllerInit) // don't start reading if init failed
jp 0:011be8250218 47 {
jp 0:011be8250218 48 if (ControllerRead())
jp 0:011be8250218 49 {
jp 0:011be8250218 50 // only decode successful reads
jp 0:011be8250218 51 ControllerDecode();
jp 0:011be8250218 52 }
jp 0:011be8250218 53 }
jp 0:011be8250218 54 }
jp 0:011be8250218 55
jp 0:011be8250218 56 bool WiiClassicControllerReader::ControllerInit()
jp 0:011be8250218 57 {
jp 0:011be8250218 58 bool success = false;
jp 0:011be8250218 59
jp 0:011be8250218 60 const BYTE cmd[] = {CONTROLLER_REGADDR, 0x00};
jp 0:011be8250218 61 if (I2C_OK == controllerPort.write(CONTROLLER_ADDR, (const char*)cmd, sizeof(cmd))) success = true;
jp 0:011be8250218 62
jp 0:011be8250218 63 return success;
jp 0:011be8250218 64 }
jp 0:011be8250218 65
jp 0:011be8250218 66 bool WiiClassicControllerReader::ControllerRead()
jp 0:011be8250218 67 {
jp 0:011be8250218 68 bool success = false;
jp 0:011be8250218 69
jp 0:011be8250218 70 // write the address we want to read from
jp 0:011be8250218 71 const BYTE cmd[] = {0x00};
jp 0:011be8250218 72 if (I2C_OK == controllerPort.write(CONTROLLER_ADDR, (const char*)cmd, sizeof(cmd)))
jp 0:011be8250218 73 {
jp 0:011be8250218 74 // the Wii Classic Controller is non-standard I2C
jp 0:011be8250218 75 // and can't manage setting the read address and immediately supplying the data
jp 0:011be8250218 76 // so wait a bit
jp 0:011be8250218 77 wait(I2C_READ_DELAY);
jp 0:011be8250218 78
jp 0:011be8250218 79 if (I2C_OK == controllerPort.read(CONTROLLER_ADDR, readBuf, sizeof(readBuf))) success = true;
jp 0:011be8250218 80 }
jp 0:011be8250218 81
jp 0:011be8250218 82 return success;
jp 0:011be8250218 83 }
jp 0:011be8250218 84
jp 0:011be8250218 85 void WiiClassicControllerReader::ControllerDecode()
jp 0:011be8250218 86 {
jp 0:011be8250218 87 ljoyX = (int)readBuf[0] & MASK_LX;
jp 0:011be8250218 88 ljoyY = (int)readBuf[1] & MASK_LY;
jp 0:011be8250218 89 rjoyY = (int)readBuf[2] & MASK_RY;
jp 0:011be8250218 90 buttonRT = (int)readBuf[3] & MASK_RT;
jp 0:011be8250218 91 buttonRC = (int)readBuf[4] & MASK_RC_DL;
jp 0:011be8250218 92 buttonSTART = (int)readBuf[4] & MASK_BSTART_ZR;
jp 0:011be8250218 93 buttonHOME = (int)readBuf[4] & MASK_BHOME_X;
jp 0:011be8250218 94 buttonSELECT = (int)readBuf[4] & MASK_BSELECT_A;
jp 0:011be8250218 95 buttonLC = (int)readBuf[4] & MASK_LC_Y;
jp 0:011be8250218 96 buttonDD = (int)readBuf[4] & MASK_BDD_B;
jp 0:011be8250218 97 buttonDR = (int)readBuf[4] & MASK_BDR_ZL;
jp 0:011be8250218 98 buttonDU = (int)readBuf[5] & MASK_BDU;
jp 0:011be8250218 99 buttonDL = (int)readBuf[5] & MASK_RC_DL;
jp 0:011be8250218 100 buttonZR = (int)readBuf[5] & MASK_BSTART_ZR;
jp 0:011be8250218 101 buttonX = (int)readBuf[5] & MASK_BHOME_X;
jp 0:011be8250218 102 buttonA = (int)readBuf[5] & MASK_BSELECT_A;
jp 0:011be8250218 103 buttonY = (int)readBuf[5] & MASK_LC_Y;
jp 0:011be8250218 104 buttonB = (int)readBuf[5] & MASK_BDD_B;
jp 0:011be8250218 105 buttonZL = (int)readBuf[5] & MASK_BDR_ZL;
jp 0:011be8250218 106
jp 0:011be8250218 107 // the RjoyX axis and LT values are really 5 bit values
jp 0:011be8250218 108 // so shift the 2 bit values read from the controller
jp 0:011be8250218 109 // 3 bits to the right
jp 0:011be8250218 110 rjoyX = ( (int)readBuf[0] & MASK_RX34 ) << 3;
jp 0:011be8250218 111 buttonLT = ( (int)readBuf[2] & MASK_LT34 ) << 3;
jp 0:011be8250218 112
jp 0:011be8250218 113 // and for each value add bit 2, bit 1, and bit 0
jp 0:011be8250218 114 // as required
jp 0:011be8250218 115 if (readBuf[2] & MASK_BDR_ZL) rjoyX += 1;
jp 0:011be8250218 116 if (readBuf[1] & MASK_BDD_B) rjoyX += 2;
jp 0:011be8250218 117 if (readBuf[1] & MASK_BDR_ZL) rjoyX += 4;
jp 0:011be8250218 118 if (readBuf[3] & MASK_LC_Y) buttonLT += 1;
jp 0:011be8250218 119 if (readBuf[3] & MASK_BDD_B) buttonLT += 2;
jp 0:011be8250218 120 if (readBuf[3] & MASK_BDR_ZL) buttonLT += 4;
jp 0:011be8250218 121
jp 0:011be8250218 122 }