#ifndef DSP28_SPI_H
#define DSP28_SPI_H

//---------------------------------------------------------------------------
// SPI Individual Register Bit Definitions:
//
// SPI FIFO Transmit register bit    definitions:
struct  SPIFFTX_BITS {     // bit    description
   Uint16 TXFFIL:5;          // 4:0    Interrupt level
   Uint16 TXFFIENA:1;        // 5      Interrupt enable
   Uint16 TXFFINTINTCLR:1;   // 6      Clear INT flag
   Uint16 TXFFINT:1;         // 7      INT flag
   Uint16 TXFFST:5;          // 12:8   FIFO status
   Uint16 TXFIFORESET:1;     // 14     Enhancement enable
   Uint16 rsvd:1;            // 15     reserved
}; 

union SPIFFTX_REG {
   Uint16                 all;
   struct SPIFFTX_BITS  bit;
};

//--------------------------------------------
// SPI FIFO recieve register bit definitions:
// 
//
struct  SPIFFRX_BITS {     // bits   description
   Uint16 RXFFIL:5;          // 4:0    Interrupt level
   Uint16 RXFFIENA:1;        // 5      Interrupt enable
   Uint16 RXFFINTCLR:1;      // 6      Clear INT flag
   Uint16 RXFFINT:1;         // 7      INT flag
   Uint16 RXFFST:5;          // 12:8   FIFO status
   Uint16 RXFIFORESET:1;     // 13     FIFO reset
   Uint16 RXFFOVFCLR:1;      // 14     Clear overflow
   Uint16 RXFFOVF:1;         // 15     FIFO overflow

}; 

union SPIFFRX_REG {
   Uint16                 all;
   struct SPIFFRX_BITS  bit;
};

//--------------------------------------------
// SPI FIFO control register bit definitions:
// 
//
struct  SPIFFCT_BITS {     // bits   description
   Uint16 TXDLY:8;           // 7:0    FIFO transmit delay
   Uint16 rsvd:8;            // 15:8   reserved
};

union SPIFFCT_REG {
   Uint16                 all;
   struct SPIFFCT_BITS  bit;
};
   
//---------------------------------------------
// SPI configuration register bit definitions:
// 
//
struct  SPICCR_BITS {      // bits   description
   Uint16 SPICHAR:4;         // 3:0    Character length control
   Uint16 SPILBK:1;          // 4      Loop-back enable/disable
   Uint16 rsvd1:1;           // 5      reserved
   Uint16 CLKPOLARITY:1;     // 6      Clock polarity
   Uint16 RESET:1;           // 7      SPI SW Reset
   Uint16 rsvd2:8;           // 15:8   reserved   
};

union SPICCR_REG {
   Uint16                all;
   struct SPICCR_BITS  bit;
};

//-------------------------------------------------
// SPI operation control register bit definitions:
// 
//
struct  SPICTL_BITS {      // bits   description
   Uint16 SPIINTENA:1;       // 0      Interrupt enable
   Uint16 TALK:1;            // 1      Master/Slave transmit enable
   Uint16 MASTER_SLAVE:1;    // 2      Network control mode
   Uint16 CLK_PHASE:1;       // 3      Clock phase select
   Uint16 OVERRUN:1;         // 4      Overrun interrupt enable
   Uint16 rsvd:11;           // 15:5   reserved      
};

union SPICTL_REG {
   Uint16                all;
   struct SPICTL_BITS  bit;
};

//--------------------------------------
// SPI status register bit definitions:
// 
//
struct  SPISTS_BITS {      // bits   description
   Uint16 rsvd1:5;           // 4:0    reserved
   Uint16 BUFFULL_FLAG:1;    // 5      SPI transmit buffer full flag
   Uint16 INT_FLAG:1;        // 6      SPI interrupt flag
   Uint16 OVERRUN_FLAG:1;    // 7      SPI reciever overrun flag
   Uint16 rsvd2:8;           // 15:8   reserved   
};

union SPISTS_REG {
   Uint16                all;
   struct SPISTS_BITS  bit;
}; 

//------------------------------------------------
// SPI priority control register bit definitions:
// 
//
struct  SPIPRI_BITS {      // bits   description
   Uint16 rsvd1:4;           // 3:0    reserved
   Uint16 FREE:1;            // 4      Free emulation mode control
   Uint16 SOFT:1;            // 5      Soft emulation mode control
   Uint16 PRIORITY:1;        // 6      Interrupt priority select
   Uint16 rsvd2:9;           // 15:7   reserved
};

union SPIPRI_REG {
   Uint16                all;
   struct SPIPRI_BITS  bit;
};       

//---------------------------------------------------------------------------
// SPI Register File:
//
struct  SPI_REGS { 
   union SPICCR_REG     SPICCR;      // Configuration register 
   union SPICTL_REG     SPICTL;      // Operation control register
   union SPISTS_REG     SPISTS;      // Status register
   Uint16  rsvd1;                      // reserved
   Uint16                 SPIBRR;      // Baud Rate
   Uint16  rsvd2;                      // reserved
   Uint16                 SPIRXEMU;    // Emulation buffer
   Uint16                 SPIRXBUF;    // Serial input buffer
   Uint16                 SPITXBUF;    // Serial output buffer
   Uint16                 SPIDAT;      // Serial data 
   union SPIFFTX_REG    SPIFFTX;     // FIFO transmit register
   union SPIFFRX_REG    SPIFFRX;     // FIFO recieve register
   union SPIFFCT_REG    SPIFFCT;     // FIFO control register
   Uint16  rsvd3[2];                   // reserved
   union SPIPRI_REG     SPIPRI;      // FIFO Priority control
};

//---------------------------------------------------------------------------
// SPI External References & Function Declarations:
//
extern volatile struct SPI_REGS SpiaRegs;
extern volatile struct SPI_REGS SpibRegs;

#endif  // end of DSP28_SPI_H definition