#include "DSP28x_Project.h"     // Device Headerfile and Examples Include File

// Prototype statements for functions found within this file.
void scia_loopback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void error();
interrupt void scia_rx_isr(void);
interrupt void scia_tx_isr(void);

// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount;

void main(void)
{
    Uint16 SendChar;
    Uint16 ReceivedChar;

// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
// This function is found in the DSP2833x_SysCtrl.c file.
	InitSysCtrl();

// Step 2. Select GPIO for the device or for the specific application:
// This function is found in the DSP2833x_Gpio.c file.
// InitGpio(); skip this as this is example selects the I/O
// for SCI-A in this file itself
   InitSciGpio();

// Step 3. Initialize PIE vector table:
// The PIE vector table is initialized with pointers to shell Interrupt
// Service Routines (ISR).  The shell routines are found in DSP2833x_DefaultIsr.c.
// Insert user specific ISR code in the appropriate shell ISR routine in
// the DSP28_DefaultIsr.c file.

// Disable and clear all CPU interrupts:
	DINT;
	IER = 0x0000;
	IFR = 0x0000;

      // Initialize Pie Control Registers To Default State:
      // This function is found in the DSP2833x_PieCtrl.c file.
	  // InitPieCtrl();  PIE is not used for this example

      // Initialize the PIE Vector Table To a Known State:
      // This function is found in DSP2833x_PieVect.c.
      // This function populates the PIE vector table with pointers
      // to the shell ISR functions found in DSP2833x_DefaultIsr.c.
	  InitPieVectTable();

      // Enable CPU and PIE interrupts
      // This example function is found in the DSP2833x_PieCtrl.c file.
      EnableInterrupts();

// Step 4. Initialize all the Device Peripherals to a known state:
// This function is found in DSP2833x_InitPeripherals.c
// InitPeripherals(); skip this for SCI tests

// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:

    LoopCount = 0;
    ErrorCount = 0;

    scia_fifo_init();	   // Initialize the SCI FIFO
	
    scia_loopback_init();  // Initalize SCI for digital loop back
    
    // Note: Autobaud lock is not required for this example

    // Send a character starting with 0
    SendChar = 10;

// Step 6. Send Characters forever starting with 0x00 and going through
// 0xFF.  After sending each, check the recieve buffer for the correct value

	for(;;)
    {
       scia_xmit(SendChar);
      
      
       while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for RRDY/RXFFST =1 for 1 data available in FIFO

       // Check received character
     ReceivedChar = ScibRegs.SCIRXBUF.all;
      if(ReceivedChar != SendChar) error();

       // Move to the next character and repeat the test
       SendChar++;
       // Limit the character to 8-bits
       SendChar &= 0x00FF;
       LoopCount++;
    }

}


// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:

void error() 
{

      ErrorCount++;
//    asm("     ESTOP0");  // Uncomment to stop the test here
//    for (;;);

}

// Test 1,SCIA  DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scia_loopback_init()
{
    // Note: Clocks were turned on to the SCIA peripheral
    // in the InitSysCtrl() function

 	SciaRegs.SCICCR.all =0x0007;   // 1 stop bit,  No loopback
                                   // No parity,8 char bits,
                                   // async mode, idle-line protocol
	SciaRegs.SCICTL1.all =0x0003;  // enable TX, RX, internal SCICLK,
                                   // Disable RX ERR, SLEEP, TXWAKE
	SciaRegs.SCICTL2.all =0x0003;
	SciaRegs.SCICTL2.bit.TXINTENA =1;
	SciaRegs.SCICTL2.bit.RXBKINTENA =1;
    SciaRegs.SCIHBAUD    =0x0000;
    SciaRegs.SCILBAUD    =0x000F;
//	SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
	SciaRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset
}



// Transmit a character from the SCI'
void scia_xmit(int a)
{
    SciaRegs.SCITXBUF=a;
}

// Initalize the SCI FIFO
void scia_fifo_init()
{
    SciaRegs.SCIFFTX.all=0xE040;
    SciaRegs.SCIFFRX.all=0x204f;
    SciaRegs.SCIFFCT.all=0x0;

}