File content as of revision 0:58ec354d3b79:

// Payload uC (Tiva) -- > SPI master
// CDMS uC (Freescale) --> SPI slave
// packet length = 32*16 bits (32 bins --> each 2 bytes)
 
#include "mbed.h"

void FUNC_MASTER_WRITE(void);
const int addr = 0x20<<1;
Timer Siv ;
I2C master (D14,D15);
InterruptIn PYLD_I2C_Int(PTA13);
SPISlave device(PTD6, PTD7, PTD5,PTD4 ); // mosi, miso, sclk, ssel --> using SPI1
InterruptIn PYLD_SPI_Interrupt(PTD2);
int payloadBins = 32;
float Stability_delay = 0.005228 ;// 0.005228

Serial pc(USBTX, USBRX); // tx, rx  --> serial feedback for debug

void payloadProcess() {
  
   
    //wait(Stability_delay); // wait after interrupt for stability
    unsigned short scienceRawPacket[payloadBins];
    
    for(int i=0; i<payloadBins;i++){
       
        
        
        while(!device.receive()); // blocking statement --> waiting for data from Payload
        scienceRawPacket[i] = device.read();   // Read byte from master

    }
    // serial feedback
    pc.printf("Packet recieved\r\n");
    for(int i=0;i<payloadBins;i++){
        pc.printf("%d\t",scienceRawPacket[i]);
        scienceRawPacket[i] = 0;
    }
    pc.printf("\r\n");
 
} 
int dt3;
bool f = 1;
char rdata[10],rdata2;
void readds()
{   

               //wait(Stability_delay);

               f = master.read(addr,rdata,2);
              // dt3 = master.read(1);
               
               
}   
 
int loop=1;
char *writedata = new char;
char data[8]= "payload"; 
 
void FUNC_MASTER_WRITE(void)
{    int data = pc.getc();      
      loop=1;
 
 
 master.frequency(100000); 
  *writedata = data; 
     while(loop)
     {
         bool check = (bool)master.write(addr,writedata,1);

         loop = 0;
     }
}  
int main() {
    int dt1 = 0,dt2 = 0;
    device.format(16,0);  // SPI format --> 16 bits, mode = 0
    device.frequency(1000000);
       
    pc.printf("Example code demonstarting Payload - CDMS SPI & I2C communication!\r\n");
    PYLD_SPI_Interrupt.rise(&payloadProcess);
    PYLD_I2C_Int.rise(&readds);
    
    while(1)
    {
    FUNC_MASTER_WRITE();
    wait(1);
    dt1 = rdata[0] ;
    dt2 = rdata[1] ;
    //pc.printf("Temperature %d \n\r",rdata);
    pc.printf("Temperature %d \n\r",dt1);
    pc.printf("Temperature2 %d \n\r",dt2);
    //pc.printf("Temperature3 %d \n\r",dt3);
    

    }
}