slave.cpp

00001 #include "mbed.h"
00002 #include "rtos.h"
00003 #include "slave.h"
00004 
00005 void write_to_master(char);                    //function to write data to master
00006 
00007 I2CSlave slave(D14,D15);                       //configuring pins p27, p28 as I2Cslave
00008 
00009 Serial pcslave(USBTX, USBRX);
00010 DigitalOut data_ready(D10);
00011 int i2c_status=0;                                 //read/write mode for i2c 0 : write2slave, 1 : write2master
00012 int reset=0;
00013 int temp;
00014 
00015 typedef struct
00016 {
00017     char data;          // To avoid dynamic memory allocation
00018     int length;
00019 }i2c_data;
00020 
00021 
00022 
00023 Mail<i2c_data,16> i2c_data_receive;
00024 Mail<i2c_data,16> i2c_data_send;
00025  
00026 
00027 void FUNC_I2C_WRITE2CDMS(char *data, int length=1)
00028 {
00029        int slave_status = 1;
00030    
00031     while(slave_status)
00032     {                 
00033             slave.address(0x20);
00034             if(slave.receive()==1)
00035             {
00036                 slave_status=slave.write(data,length);
00037                
00038                 
00039             }
00040             else if(slave.receive()==3 || slave.receive()==2)
00041             {
00042                 slave_status=slave.read(data,length);
00043             }
00044             
00045     }
00046             printf("\ndone\n\r");
00047 
00048 }
00049 char data_send,data_receive;
00050 void T_I2C_BAE()
00051 {
00052     //char data_send,data_receive;
00053     //while(1)
00054     //{
00055        // Thread::signal_wait(0x1);
00056         //i2c_status = temp;
00057         //wait(0.5);
00058         printf("\n entered thread\n\r");
00059         if(i2c_status == 0 && reset !=1)
00060         {
00061             
00062             FUNC_I2C_WRITE2CDMS(&data_receive);
00063             i2c_data * i2c_data_r = i2c_data_receive.alloc();
00064             i2c_data_r->data = data_receive;
00065             i2c_data_r->length = 1;
00066             i2c_data_receive.put(i2c_data_r);
00067             printf("\n Data received from CDMS is %c\n\r",data_receive);
00068             i2c_data_receive.free(i2c_data_r);                              // This has to be done from a differen thread
00069             
00070         }
00071         else if(i2c_status ==1 && reset !=1)
00072         {
00073             osEvent evt = i2c_data_send.get();
00074             if (evt.status == osEventMail) 
00075             {
00076                 i2c_data *i2c_data_s = (i2c_data*)evt.value.p;
00077                 data_send = i2c_data_s -> data;
00078                 FUNC_I2C_WRITE2CDMS(&data_send);
00079                 printf("\nData sent to CDMS is %c\n\r",data_send);
00080                 i2c_data_send.free(i2c_data_s);
00081                 i2c_status = 0;
00082                 //temp = i2c_status;
00083             }
00084         }  
00085            
00086     //}
00087 }
00088 
00089         
00090 
00091 void FUNC_INT()
00092 {
00093    reset = 0;
00094    
00095      
00096 }
00097 
00098 void FUNC_RESET()
00099 {
00100     reset = 1;
00101 }
00102 
00103 void ir2master()
00104 {
00105         
00106         char data='a';
00107         data_ready=0;
00108         data = pcslave.getc();
00109         reset =0;
00110         i2c_status=1;
00111         i2c_data * i2c_data_s = i2c_data_send.alloc();
00112         i2c_data_s->data = data;
00113         i2c_data_s->length = 1;
00114         i2c_data_send.put(i2c_data_s); 
00115         data_ready=1;
00116         //temp = i2c_status;
00117 }
00118       
00119    
00120    
00121 
00122 
00123