///  SPI Communication


#include "msp430F5438A.h"                                     // microprozessor 
#include "stdint.h"

//Variables
uint8_t addr;
uint8_t dataX0;
uint8_t dataX1;
uint8_t dataY0;
uint8_t dataY1;
uint8_t dataZ0;
uint8_t dataZ1;
uint8_t Test;
uint8_t receive_byte;
uint8_t receive_data;

//Settings of the ADXL345

uint8_t testreadwrite(); 

void spi_senden_CONFG();

void main (void)                                                // Starting main program
   
{

   WDTCTL=WDTPW+WDTHOLD;                                        // turn of the Watchdogs
  
  P10SEL|= BIT0 + BIT1 + BIT2 + BIT3;                               //P10SEL|=0x0F;    // SCLK, BIT3, P10.3 ; MOSI ist 1 auf P10.1 ; SOMI ist 0 auf P10.2, CS(low active) auf 1 am P10.0, 0b00001101  // PSEL, SPI Konfiguration ausw‰hlen, 0b00001111
  P10DIR|=0x40;                                                 //P10DIR|=0x0D;  //GPIO-Pin 10.6, defining the direction, output
  
  UCB3CTL1|=UCSWRST;                                            // **Put state machine in reset** !!!
  UCB3CTL0|=UCSYNC | UCMST | UCMSB | UCCKPL | UCCKPH | UCMODE1;       // synchronous Mode,3 pin SPI,  (4 pin SPI, old), Master Mode, MSB first   
  UCB3CTL1|=UCSSEL_2;                                           // SMCLK 
  UCB3BR0|=0x02;                                                // Rate, UCA3BR0 and UCA3BR1, (UCAxBR0 + UCAxBR1 ? 256)
  UCB3BR1=0;                                               
 
  UCB3CTL1&=~UCSWRST;                                           // Initialising of the State machine

 
  
  while (1)
  
 {                       
 
    
  
  testreadwrite();

  }



uint8_t testreadwrite()                                        // Testfunction   
{                                                
        P10OUT&=~BIT6;					       // CS putting to low to start transmission
        __delay_cycles(1);                                     // inserting a delay
   
    while (!(UCB3STAT&UCBUSY)==0);                             //    while (UCBUSY!==0));
           UCB3TXBUF=0x80;                                     // sending  
           
                                     
    
    while (!(UCB3STAT&UCBUSY)==0); 
           //    while( (UCB3IFG&UCRXIFG) == 0);
           //  receive_data=UCB3RXBUF;  //eingebaut
            UCB3TXBUF=0xFF;                                   // sending dummy byte
           //while (!(UCB3IFG&UCRXIFG));  
    while (!(UCRXIFG)); 
            
            receive_data=UCB3RXBUF;  //ergänzt
            __delay_cycles(1);   
            P10OUT|=BIT6;                              
 return(receive_data);
                                                             // putting CS to 1 in the while loop outside of the function
};