DS2482EightChannel.cpp

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00032 
00033 
00034 #include "Masters/DS248x/DS2482EightChannel/DS2482EightChannel.h"
00035 
00036 using OneWire::OneWireMaster;
00037 using OneWire::DS2482EightChannel;
00038 
00039 
00040 //*********************************************************************
00041 DS2482EightChannel::DS2482EightChannel(mbed::I2C & i2c_bus, uint8_t adrs) : DS248x(i2c_bus, adrs)
00042 {
00043 }
00044 
00045 
00046 //*********************************************************************
00047 OneWireMaster::CmdResult DS2482EightChannel::selectChannel(uint8_t channel)
00048 {
00049     OneWireMaster::CmdResult result;
00050     uint8_t ch, ch_read;
00051 
00052     // Channel Select (Case A)
00053     //   S AD,0 [A] CHSL [A] CC [A] Sr AD,1 [A] [RR] A\ P
00054     //  [] indicates from slave
00055     //  CC channel value
00056     //  RR channel read back
00057 
00058     switch (channel)
00059     {
00060     default:
00061     case 0:
00062         ch = 0xF0;
00063         ch_read = 0xB8;
00064         break;
00065     case 1:
00066         ch = 0xE1;
00067         ch_read = 0xB1;
00068         break;
00069     case 2:
00070         ch = 0xD2;
00071         ch_read = 0xAA;
00072         break;
00073     case 3:
00074         ch = 0xC3;
00075         ch_read = 0xA3;
00076         break;
00077     case 4:
00078         ch = 0xB4;
00079         ch_read = 0x9C;
00080         break;
00081     case 5:
00082         ch = 0xA5;
00083         ch_read = 0x95;
00084         break;
00085     case 6:
00086         ch = 0x96;
00087         ch_read = 0x8E;
00088         break;
00089     case 7:
00090         ch = 0x87;
00091         ch_read = 0x87;
00092         break;
00093     };
00094 
00095     result = sendCommand (ChannelSelectCmd, ch);
00096     if (result == OneWireMaster::Success)
00097     {
00098         result = readRegister(ChannelSelectReg, ch, true);
00099         if (result == OneWireMaster::Success)
00100         {
00101             // check for failure due to incorrect read back of channel
00102             if (ch != ch_read)
00103             {
00104                 result = OneWireMaster::OperationFailure;
00105             }
00106         }
00107     }
00108 
00109     return result;
00110 }