FreeRTOS SPI example start.
This example use one SPI instance as master and another as slave on one board.
Master and slave are both use interrupt way.
Please make sure you make the correct line connection. Basically, the connection is: 
 SPI_master -- SPI_slave   
   SCK      --    SCK  
   PCS0     --    PCS0 
   SOUT     --    SIN  
   SIN      --    SOUT 
s0 --> 1st try
Master transmitted:
0x 0  0x 1  0x 2  0x 3  0x 4  0x 5  0x 6  0x 7  
0x 8  0x 9  0x a  0x b  0x c  0x d  0x e  0x f  
0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17  
0x18  0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f  

Slave received:
0x 0  0x 1  0x 2  0x 3  0x 4  0x 5  0x 6  0x 7  
0x 8  0x 9  0x a  0x b  0x c  0x d  0x e  0x f  
0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17  
0x18  0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f  

Slave transmitted:
0xff  0xfe  0xfd  0xfc  0xfb  0xfa  0xf9  0xf8  
0xf7  0xf6  0xf5  0xf4  0xf3  0xf2  0xf1  0xf0  
0xef  0xee  0xed  0xec  0xeb  0xea  0xe9  0xe8  
0xe7  0xe6  0xe5  0xe4  0xe3  0xe2  0xe1  0xe0  

Master received:
0xff  0xfe  0xfd  0xfc  0xfb  0xfa  0xf9  0xf8  
0xf7  0xf6  0xf5  0xf4  0xf3  0xf2  0xf1  0xf0  
0xef  0xee  0xed  0xec  0xeb  0xea  0xe9  0xe8  
0xe7  0xe6  0xe5  0xe4  0xe3  0xe2  0xe1  0xe0  

SPI master transfer completed successfully.
Slave-to-master data verified ok.
SPI slave transfer completed successfully. 
Master-to-slave data verified ok.

s0 --> 2nd try
Master transmitted:
0x 1  0x 2  0x 3  0x 4  0x 5  0x 6  0x 7  0x 8  
0x 9  0x a  0x b  0x c  0x d  0x e  0x f  0x10  
0x11  0x12  0x13  0x14  0x15  0x16  0x17  0x18  
0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f  0x20  

Slave received:
0x 1  0x 2  0x 3  0x 4  0x 5  0x 6  0x 7  0x 8  
0x 9  0x a  0x b  0x c  0x d  0x e  0x f  0x10  
0x11  0x12  0x13  0x14  0x15  0x16  0x17  0x18  
0x19  0x1a  0x1b  0x1c  0x1d  0x1e  0x1f  0x20  

Slave transmitted:
0xfe  0xfd  0xfc  0xfb  0xfa  0xf9  0xf8  0xf7  
0xf6  0xf5  0xf4  0xf3  0xf2  0xf1  0xf0  0xef  
0xee  0xed  0xec  0xeb  0xea  0xe9  0xe8  0xe7  
0xe6  0xe5  0xe4  0xe3  0xe2  0xe1  0xe0  0xdf  

Master received:
0xfe  0xfd  0xfc  0xfb  0xfa  0xf9  0xf8  0xf7  
0xf6  0xf5  0xf4  0xf3  0xf2  0xf1  0xf0  0xef  
0xee  0xed  0xec  0xeb  0xea  0xe9  0xe8  0xe7  
0xe6  0xe5  0xe4  0xe3  0xe2  0xe1  0xe0  0xdf  

SPI master transfer completed successfully.
Slave-to-master data verified ok.
SPI slave transfer completed successfully. 
Master-to-slave data verified ok.