pt100.cpp

00001 #include "mbed.h"
00002 #include "uart.h"
00003 #include "interpret.h"
00004 #include "pt100.h"
00005 #include "MCP23017.h"
00006 
00007 
00008 
00009 //---------------------------------------
00010 // Hardware recources
00011 //---------------------------------------
00012 MCP23017 *PT100_I2C;
00013 
00014 
00015 
00016 //---------------------------------------
00017 // Prototypes
00018 //---------------------------------------
00019 unsigned char PT100_mirrowBits( unsigned char input);
00020 
00021 
00022 
00023 //---------------------------------------
00024 // Internal variables
00025 //---------------------------------------
00026 
00027 
00028 
00029 
00030 //---------------------------------------
00031 // External variables
00032 //---------------------------------------
00033 
00034 
00035 
00036 //---------------------------------------
00037 // Global Functions
00038 //---------------------------------------
00039 void PT100_init( void )
00040 {
00041     PT100_I2C = new MCP23017( p9, p10, PT100_I2C_ADD);
00042     PT100_I2C->config(0,0,0);           // set to outputs, no pull-ups, not-inverted
00043     PT100_I2C->write_mask(0, 0xFFFF);   // set outputs low
00044 }
00045 
00046 
00047 
00048 // process commands
00049 void PT100_deviceID_process( void )
00050 {
00051     unsigned short temp16U;
00052     
00053     switch( uartBuffer[ INT_BUF_COMMAND ] )
00054     {
00055         //-----------------
00056         case PT100_COM_SET:
00057         //-----------------
00058         {
00059             // Get byte
00060             temp16U = (unsigned short)PT100_mirrowBits( uartBuffer[ INT_BUF_1DATA ]);
00061             // Write to PT100 HW
00062             PT100_I2C->write_mask(temp16U, 0x00FF);
00063             // Generate acknowledge
00064             INT_generateACKFrame(INT_ID_PT100, INT_COM_ACK);
00065 
00066             break;
00067         }
00068         
00069         //-----------------
00070         case PT100_COM_GET:
00071         //-----------------
00072         {
00073             temp16U = (unsigned short)PT100_mirrowBits( (unsigned char)(PT100_I2C->read_mask(0x00FF)));
00074             
00075             // Generate acknowledge
00076             uartBuffer[INT_BUF_DEVICEID] = INT_ID_PT100;
00077             uartBuffer[INT_BUF_COMMAND] = INT_COM_ACK;
00078             uartBuffer[INT_BUF_NUM] = 1;
00079             uartBuffer[INT_BUF_1DATA] = (char)(0x00FF & temp16U);
00080             UART_handler.bytesToWrite = 4;
00081         
00082             break;
00083         }   
00084         
00085         //-----------------
00086         default:
00087         //-----------------
00088         {
00089             // Command not supported
00090             INT_generateACKFrame(INT_ID_PT100, INT_COM_COM_NOTSUPP);
00091         }     
00092     }//switch
00093     
00094 }
00095 
00096 //---------------------------------------
00097 // Internal Functions
00098 //---------------------------------------
00099 
00100 unsigned char PT100_mirrowBits( unsigned char input)
00101 {
00102     char i;
00103     unsigned char tempChar = 0;
00104     
00105     for( i = 0; i < 8; i++)
00106     {
00107         if( input & (1 << i) )
00108         {
00109             tempChar |= (1 << 7 - i);
00110         }
00111     
00112     }
00113     
00114     return tempChar;
00115 }