/*=================================================================
File name	: SPISE2PD.C                   
                    
Originator	: Settu Duraisamy
			  C2000 Applications Team
		      Texas Instruments

Description	: This file contains the SPI bus Serial EEPROM driver 
			  implemented using Virtual SPI driver		  				

Date		: 6/30/2003 (DD/MM/YYYY)
====================================================================*/
																	
#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File

#include "spise2p.h"
//#include "pins.h"

/* Instance the SPI bus serial EEPROM driver 					*/  
static SPISE2P_DRV se2p=SPISE2P_DRV_DEFAULTS;                                  

/* Instance serial EEPROm data transfer structure				*/
static SE2P_DATA	writeData, readData;

// Prototype statements for functions found within this file.
interrupt void PRD_TICK(void);
interrupt void cpu_timer2_isr(void);

int ccc=0;

/********************************************************************/
/******* SPI bus Serial EEPROM driver Initialization routine ********/ 
/********************************************************************/

void Seeprom_write(	unsigned int adres, 
					unsigned int buf[],
					unsigned int size)
{
  unsigned int len;

//	diod2_on();

	CpuTimer2.InterruptCount=0;
	CpuTimer2Regs.TCR.all = 0x4020; // Use write-only instruction to set TSS bit = 0

	while(!spiSe2pFree(&se2p));

	size = (size / WORD_LEN) + (size % WORD_LEN);
	while(size)
	{
		len = PAGE_LEN - (adres % PAGE_LEN);
		if(len > size) len=size;

	    writeData.dataPtr  = buf;
	    writeData.nrData   = len;
	    writeData.se2pAddr = adres * WORD_LEN;
		
		spiSe2pWrite(&se2p, &writeData);
		while(!spiSe2pFree(&se2p));

		buf		+= len;
		adres	+= len;
		size	-= len;
	}
	CpuTimer2Regs.TCR.all = 0x4010; // Use write-only instruction to set TSS bit = 1
//	diod2_off();

}

void Seeprom_read(	unsigned int adres,
					unsigned int buf[],
					unsigned int size)
{
  unsigned int len;

//	diod2_on();
	CpuTimer2.InterruptCount=0;
	CpuTimer2Regs.TCR.all = 0x4020; // Use write-only instruction to set TSS bit = 0

	while(!spiSe2pFree(&se2p));

	size = (size / WORD_LEN) + (size % WORD_LEN);
	while(size)
	{
		len = PAGE_LEN - (adres % PAGE_LEN);
		if(len > size) len=size;

	    readData.dataPtr  = buf;
	    readData.nrData   = len;
	    readData.se2pAddr = adres * WORD_LEN;

		spiSe2pRead(&se2p, &readData);
		while(!spiSe2pFree(&se2p));

		buf		+= len;
		adres	+= len;
		size	-= len;
	}
	CpuTimer2Regs.TCR.all = 0x4010; // Use write-only instruction to set TSS bit = 1
//	diod2_off();
}

void Init_Seeprom()
{
    se2p.init(&se2p); 

   EALLOW;  // This is needed to write to EALLOW protected registers
   PieVectTable.TINT2 = &cpu_timer2_isr;
   EDIS;    // This is needed to disable write to EALLOW protected registers

   InitCpuTimers();   // For this example, only initialize the Cpu Timers
//	ConfigCpuTimer(&CpuTimer2, (SYSCLKOUT/1000000), 100);
//   ConfigCpuTimer(&CpuTimer2, (SYSCLKOUT/1000000), 10);
   ConfigCpuTimer(&CpuTimer2, (SYSCLKOUT/1000000), 100);

   IER |= M_INT14;
}

void SPISE2P_DRV_init(SPISE2P_DRV *eeprom)
{ 	           
/* Configure SPI-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SPI functional pins.
// Comment out other unwanted lines.
   	EALLOW;
    GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1; // Configure GPIO16 as SPISIMOA
    GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1; // Configure GPIO17 as SPISOMIA
    GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1; // Configure GPIO18 as SPICLKA
    GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 0; // General purpose I/O 19 (default) (I/O)
	GpioCtrlRegs.GPADIR.bit.GPIO19 = 1;	//	Configures the GPIO pin as an output
	GpioDataRegs.GPADAT.bit.GPIO19 = 0;
    EDIS;

	/* Configure the SPI: 8-bit, Rising edge with delay */
	SpiaRegs.SPICCR.all=0x0007;
	SpiaRegs.SPICTL.all=0x001F;
	SpiaRegs.SPISTS.all=0x00;

	SpiaRegs.SPIBRR = (LSPCLK / SPIBAUD_RATE) - 1;

	SpiaRegs.SPIFFTX.all=0x8000;
	SpiaRegs.SPIFFRX.all=0x0000;
	SpiaRegs.SPIFFCT.all=0x00;
	SpiaRegs.SPIPRI.all=0x0010;
	
	/* Disable Chip Select of Serial EEPROM							*/
	eeprom->csr=0;
	eeprom->msgPtr=0;

	SpiaRegs.SPICCR.bit.SPISWRESET=1;  // Enable SCI
}

void SPISE2P_DRV_csset()
{
	GpioDataRegs.GPADAT.bit.GPIO19 = 1;
}

void SPISE2P_DRV_csclr()
{
	GpioDataRegs.GPADAT.bit.GPIO19 = 0;
}

unsigned int spiSe2pFree(SPISE2P_DRV *se2p)
{
	if(se2p->csr&0x3)	return(0);
	else				return(1);
}

void spiSe2pWrite(SPISE2P_DRV *se2p,  SE2P_DATA *msgPtr)
{
	se2p->msgPtr=msgPtr;
	se2p->csr|=0x1;
}

void spiSe2pRead(SPISE2P_DRV *se2p,  SE2P_DATA *msgPtr)
{	
	se2p->msgPtr=msgPtr;
	se2p->csr|=0x2;
}

/********************************************************************/
/******* SPI bus Serial EEPROM driver Tick function *****************/ 
/********************************************************************/

interrupt void cpu_timer2_isr(void)
{  EALLOW;
   CpuTimer2.InterruptCount++;

	se2p.tick(&se2p); 

   // The CPU acknowledges the interrupt.
   EDIS;
}
																	
void SPISE2P_DRV_tick(SPISE2P_DRV *eeprom)
{
	static unsigned int step=0;
   	static unsigned int dataCount=0;
   	static volatile unsigned int dummy=0;
  	
	switch(step)
	{
	case 0:	
		/* If write request is SET, then trigger the Write operation	
		   If read request is SET, then trigger the Read operation
		   If Read request is also not SET, then continue to poll	*/
	 
 			if(eeprom->csr&SPISE2P_WRRQ)
			{ step=1;
			  eeprom->csr|=SPISE2P_WRIP;	/* Set Write in progress*/
 			  eeprom->csclr();
			}
			  
			if(eeprom->csr&SPISE2P_RDRQ)
			{ step=13;
			  eeprom->csr|=SPISE2P_RDIP;	/* Set Read in progress	*/
			  eeprom->csclr();
		  	}
			break;
	
	case 1:
		/************************************************************	 
		*********** SPI bus EEPROM Write Starts from here ***********
		*************************************************************
		Prier to any attempt to write data to SPI serial EEPROM 
		Write Enable Latch must be set by issuing the WREN command	*/
			SpiaRegs.SPICCR.all=SPISE2P_TFR8BIT;
			SpiaRegs.SPITXBUF=SPISE2P_WREN_CMD;
		   	SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;		
   		   	step=2;
		   	break;

	case 2: 
		/* Wait for VSPI State machine to send the WREN command and 
		 serial EEPROM Chip Select must be brought to HIGH to set
		 the WREN latch												*/
	
			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ 
			  dummy=SpiaRegs.SPIRXBUF; 	    /* Reset SPI INT FLAG		*/
 			  eeprom->csset();

			  step=3;
			}	
			break;

	case 3:	 
		/* Assert CS of Serial EEPROM and send WRITE command 		*/ 

	  		eeprom->csclr();		
			SpiaRegs.SPICCR.all=SPISE2P_TFR8BIT;
			SpiaRegs.SPITXBUF=SPISE2P_WRITE_CMD;
		   	SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;		
	  		step=4;
			break;
	
	case 4:	 
		/* Wait for VSPI State machine to send the WRITE command 	*/   

			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ dummy=SpiaRegs.SPIRXBUF; 	    /* Reset SPI INT FLAG		*/
			  step=5;
			}	
			break;

	case 5:	 
		/* Send Address 											*/

			#if(SPISE2P_ADDR_WIDTH==SIXTEEN_BIT)
			  SpiaRegs.SPICCR.all= SPISE2P_TFR16BIT;
			  SpiaRegs.SPITXBUF=eeprom->msgPtr->se2pAddr; 
			#endif
			#if(SPISE2P_ADDR_WIDTH==EIGHT_BIT)
			  SpiaRegs.SPICCR.all= SPISE2P_TFR8BIT;
			  SpiaRegs.SPITXBUF=eeprom->msgPtr->se2pAddr<<8;
			#endif
            
     		SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;	/* Set TXBUF FULL FLAG		*/
			step=6;
			break;
	
	case 6:	 
		/* Wait for VSPI State machine to send the Address 			*/   

			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ dummy=SpiaRegs.SPIRXBUF; 	    /* Reset SPI INT FLAG		*/
			  step=7;
			}	
			break;
	
	case 7:	 
		/* Send  Data												*/

			#if(SPISE2P_DATA_WIDTH==SIXTEEN_BIT)
			 SpiaRegs.SPICCR.all=SPISE2P_TFR16BIT;
			 SpiaRegs.SPITXBUF=*(eeprom->msgPtr->dataPtr+dataCount);
			#endif
			  
			#if(SPISE2P_DATA_WIDTH==EIGHT_BIT)
			 SpiaRegs.SPICCR.all=SPISE2P_TFR8BIT;
			 SpiaRegs.SPITXBUF=*(eeprom->msgPtr->dataPtr+dataCount)<<8; 
			#endif
			  
			dataCount++;
    		SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;	/* Set TXBUF FULL FLAG		*/
			step=8;
			break;

	case 8:   
		/* Wait for VSPI State machine to send the Data.
		   If all the data are sent, then set the CS pin to HIGH  
		   to program or write the data in EEPROM array				*/

			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ dummy=SpiaRegs.SPIRXBUF; 	    /* Reset SPI INT FLAG		*/

			  if (dataCount==eeprom->msgPtr->nrData)
			  { eeprom->csset();
			  	step=9;}
			  else
			  step=7;					/* Write next data			*/
			}
			break;


	case 9:  
		/* Read the EEPROM status register to check whether the 
		   data sent are indeed programmed to the EEPROM array.
		   Hence, send RDSR command to EEPROM to read status reg.	*/

			eeprom->csclr();
			SpiaRegs.SPICCR.all=SPISE2P_TFR8BIT;
			SpiaRegs.SPITXBUF=SPISE2P_RDSR_CMD;
   			SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;	/* Set TXBUF FULL FLAG		*/
  			step=10;
			break;

	case 10:  
		/* Wait for VSPI State machine to send RDSR command			*/
		  	
			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ dummy=SpiaRegs.SPIRXBUF; 	    /* Reset SPI INT FLAG		*/
		  	  step=11;
		    }
			break;
	
	case 11:  
		/* Send dummy Data to read Status reg.						*/
			  
			SpiaRegs.SPITXBUF=SPISE2P_DUMMY_DATA;
   			SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;	/* Set TXBUF FULL FLAG		*/
			step=12;
			break;

	case 12:   
		/* Wait for VSPI State machine to clock out status reg.
		   Check, whether the data are written to the EEPROM array,
		   If written, then reset the WRIP(write in progress) and 
		   WRRQ(Write request bit) and go back to STATE0			*/
			
			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ eeprom->csset();		

			  if (SpiaRegs.SPIRXBUF & SPISE2P_BUSY_MASK	)
			    step=9;
			  else
			  {	eeprom->csr&=(~SPISE2P_WRIP);
				eeprom->csr&=(~SPISE2P_WRRQ);
				step=0;
				dataCount=0;
			  }
			}
			break;
	
	case 13:	
		/************************************************************	 
		*********** SPI bus EEPROM Read Starts from here ***********
		*************************************************************
		Send READ Command to SPI bus serail EEPROM 					*/

			SpiaRegs.SPICCR.all=SPISE2P_TFR8BIT;
			SpiaRegs.SPITXBUF=SPISE2P_READ_CMD;
   			SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;	/* Set TXBUF FULL FLAG		*/
			step=14;
			break;
	
	case 14: 
		/* Wait for VSPI State machine to send READ command			*/   

			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ dummy=SpiaRegs.SPIRXBUF; 	    /* Reset SPI INT FLAG		*/
			  step=15;
			}	
			  break;

	case 15: 
		/* Send Address												*/

 			#if(SPISE2P_ADDR_WIDTH==SIXTEEN_BIT)
			  SpiaRegs.SPICCR.all= SPISE2P_TFR16BIT;
			  SpiaRegs.SPITXBUF=eeprom->msgPtr->se2pAddr; 
			#endif
			#if(SPISE2P_ADDR_WIDTH==EIGHT_BIT)
			  SpiaRegs.SPICCR.all= SPISE2P_TFR8BIT;
			  SpiaRegs.SPITXBUF=eeprom->msgPtr->se2pAddr<<8;
			#endif
            
   			SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;	/* Set TXBUF FULL FLAG		*/
			step=16;
			break;
	
	case 16: 
		/* Wait for VSPI State machine to send Address				*/   

			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ dummy=SpiaRegs.SPIRXBUF; 	    /* Reset SPI INT FLAG		*/
			  step=17;
			}	
			break;
	
	case 17: 
		/* Send Dummy value to clock out data from serial EEPROM	*/

			#if(SPISE2P_DATA_WIDTH==SIXTEEN_BIT)
			  SpiaRegs.SPICCR.all= SPISE2P_TFR16BIT;
			  SpiaRegs.SPITXBUF=SPISE2P_DUMMY_DATA;
			#endif
			  
			#if(SPISE2P_DATA_WIDTH==EIGHT_BIT) 
			  SpiaRegs.SPICCR.all= SPISE2P_TFR8BIT;
			  SpiaRegs.SPITXBUF=SPISE2P_DUMMY_DATA<<8;
			#endif
			  
   			SpiaRegs.SPISTS.bit.BUFFULL_FLAG=1;	/* Set TXBUF FULL FLAG		*/
		 	step=18;
			break;

	case 18:  
		/* Wait for VSPI State machine to clk out data from EEPROM	*/

			if(SpiaRegs.SPISTS.bit.INT_FLAG)		/* Check SPI INT FLAG 		*/
			{ 
		 	  #if(SPISE2P_DATA_WIDTH==SIXTEEN_BIT)
		 	    *(eeprom->msgPtr->dataPtr+dataCount)=SpiaRegs.SPIRXBUF; 
		 	  #endif
		 	     
		 	  #if(SPISE2P_DATA_WIDTH==EIGHT_BIT) 
		 	    *(eeprom->msgPtr->dataPtr+dataCount)=SpiaRegs.SPIRXBUF&0xFF;
		 	  #endif
		 	  dataCount++;
		 	  step=19;
			}	
			break;
	
	case 19:  
		/* If all the data are read, terminate the read operation by 
		 rising the CS. Then reset the RDIP (Read in progress) bit 
		 and reset the RDRQ(Read request) bit and go back to STATE0	*/
		  
			if (dataCount==eeprom->msgPtr->nrData)
			{ eeprom->csset();
			  step=0;
			  dataCount=0;
			  eeprom->csr&=(~SPISE2P_RDIP);
			  eeprom->csr&=(~SPISE2P_RDRQ);
			}
			else
			  step=17;
			break;
	}
}