// TI File $Revision: /main/2 $
// Checkin $Date: January 4, 2011   10:03:22 $
//###########################################################################
//
// FILE:    Example_2806xSci_Echoback.c
//
// TITLE:   F2806x Device SCI Echoback.
//
// ASSUMPTIONS:
//
//    This program requires the F2806x header files.
//    As supplied, this project is configured for "boot to SARAM" operation.
//
//    Connect the SCI-A port to a PC via a transciever and cable.
//    The PC application 'hypterterminal' can be used to view the data
//    from the SCI and to send information to the SCI.  Characters recieved
//    by the SCI port are sent back to the host.
//
//    As supplied, this project is configured for "boot to SARAM"
//    operation.  The F2806x Boot Mode table is shown below.
//    $Boot_Table:
//
//    While an emulator is connected to your device, the TRSTn pin = 1,
//    which sets the device into EMU_BOOT boot mode. In this mode, the
//    peripheral boot modes are as follows:
//
//      Boot Mode:       EMU_KEY        EMU_BMODE
//                       (0xD00)         (0xD01)
//      ---------------------------------------
//      Wait             !=0x55AA        X
//      I/O              0x55AA          0x0000
//      SCI              0x55AA          0x0001
//      Wait             0x55AA          0x0002z
//      Get_Mode         0x55AA          0x0003
//      SPI              0x55AA          0x0004
//      I2C              0x55AA          0x0005
//      OTP              0x55AA          0x0006
//      ECANA            0x55AA          0x0007
//      SARAM            0x55AA          0x000A   <-- "Boot to SARAM"
//      Flash            0x55AA          0x000B
//      Wait             0x55AA          Other
//
//   Write EMU_KEY to 0xD00 and EMU_BMODE to 0xD01 via the debugger
//   according to the Boot Mode Table above. Build/Load project,
//   Reset the device, and Run example
//
//   $End_Boot_Table
//
//
// Description:
//
//
//    This test recieves and echo-backs data through the SCI-A port.
//
//    1) Configure hyperterminal:
//       Use the included hyperterminal configuration file SCI_96.ht.
//       To load this configuration in hyperterminal: file->open
//       and then select the SCI_96.ht file.
//    2) Check the COM port.
//       The configuration file is currently setup for COM1.
//       If this is not correct, disconnect Call->Disconnect
//       Open the File-Properties dialog and select the correct COM port.
//    3) Connect hyperterminal Call->Call
//       and then start the F2806x SCI echoback program execution.
//    4) The program will print out a greeting and then ask you to
//       enter a character which it will echo back to hyperterminal.
//
//
//    Watch Variables:
//       LoopCount for the number of characters sent
//       ErrorCount
//
//
//###########################################################################
// $TI Release: 2806x C/C++ Header Files and Peripheral Examples V1.00 $
// $Release Date: January 11, 2011 $
//###########################################################################

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


// Prototype statements for functions found within this file.
void scia_echoback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void error();

interrupt void adc_isr(void);
interrupt void scia_tx_isr(void);
void Adc_Config(void);
void send_result(int res);

// Global counts used in this example
Uint16 LoopCount;
Uint16 Voltage1;
//Uint16 Voltage2;
Uint16 LoopCount1;
Uint16 ErrorCount;
float b;
float V1,Va;
int i,b3=0,b2=0,b1=0,b0;
int B3 = 0x40,B2=0x30,B1=0x20,B0=0x10; // defining flag bits for accurate transfer

void main(void)
         {
    Uint16 SendChar;
//  int ReceivedChar;
  //  char *msg;

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the F2806x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO:
// This example function is found in the F2806x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
   // InitGpio(); Skipped for this example

// For this example, only init the pins for the SCI-A port.
// This function is found in the F2806x_Sci.c file.
   InitSciaGpio();

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
   DINT;

// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the F2806x_PieCtrl.c file.
   InitPieCtrl();

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

// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in F2806x_DefaultIsr.c.
// This function is found in F2806x_PieVect.c.
   InitPieVectTable();
   EALLOW;
   PieVectTable.ADCINT1 = &adc_isr;
   EDIS;
   
  
// Step 4. Initialize all the Device Peripherals:
// This function is found in F2806x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   scia_fifo_init();       // Initialize the SCI FIFO
     scia_echoback_init();  // Initalize SCI for echoback
   InitAdc();

EnableInterrupts();
// Step 5. User specific code:
   //Enable ADCINT1 in PIE
   PieCtrlRegs.PIEIER1.bit.INTx1 = 1;
   IER |= M_INT1;
   EINT;
   ERTM;
b=0;
    LoopCount = 0;
    LoopCount1 = 0;
    ErrorCount = 0;

 //Configure ADC
            EALLOW;
        AdcRegs.ADCCTL2.bit.ADCNONOVERLAP = 1;  // Enable non-overlap mode
        AdcRegs.ADCCTL1.bit.INTPULSEPOS = 1;    //ADCINT1 trips after AdcResults latch
        AdcRegs.INTSEL1N2.bit.INT1E     = 1;    //Enabled ADCINT1
        AdcRegs.INTSEL1N2.bit.INT1CONT  = 0;    //Disable ADCINT1 Continuous mode
        AdcRegs.INTSEL1N2.bit.INT1SEL   = 1;    // setup EOC1 to trigger ADCINT1 to fire
        AdcRegs.ADCSOC0CTL.bit.CHSEL    = 4;    // set SOC0 channel select to ADCINA4
        AdcRegs.ADCSOC1CTL.bit.CHSEL    = 2;    // set SOC1 channel select to ADCINA2
        AdcRegs.ADCSOC0CTL.bit.TRIGSEL  = 5;    // set SOC0 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
        AdcRegs.ADCSOC1CTL.bit.TRIGSEL  = 5;    // set SOC1 start trigger on EPWM1A, due to round-robin SOC0 converts first then SOC1
        AdcRegs.ADCSOC0CTL.bit.ACQPS    = 6;    //set SOC0 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
        AdcRegs.ADCSOC1CTL.bit.ACQPS    = 6;    //set SOC1 S/H Window to 7 ADC Clock Cycles, (6 ACQPS plus 1)
        EDIS;

    // Assumes ePWM1 clock is already enabled in InitSysCtrl();
       EPwm1Regs.ETSEL.bit.SOCAEN   = 1;        // Enable SOC on A group
       EPwm1Regs.ETSEL.bit.SOCASEL  = 4;        // Select SOC from CMPA on upcount
       EPwm1Regs.ETPS.bit.SOCAPRD   = 1;        // Generate pulse on 1st event
       EPwm1Regs.CMPA.half.CMPA     = 0x0080;   // Set compare A value
       EPwm1Regs.TBPRD              = 0xFFFF;   // Set period for ePWM1
       EPwm1Regs.TBCTL.bit.CTRMODE  = 0;        // count up and start

    // Wait for ADC interrupt

       SendChar = 0;
       for(i=0;i<50;i++)
      {
       LoopCount++;
        
       send_result(Voltage1); //send to extract bits
    
        //break;
      }

 
}

interrupt void  adc_isr(void)
{

  Voltage1 = AdcResult.ADCRESULT0; //decimal value
  //send_result(Voltage1);
  V1 = Voltage1;
  Va = (V1 * 3.3)/(4095); //extracting analog value
  //Voltage2 = AdcResult.ADCRESULT1;
b=5;
    AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;       //Clear ADCINT1 flag reinitialize for next SOC
  PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE
 return;
}
// Test 1,SCIA  DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scia_echoback_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 =0x0002;  // enable TX, RX, internal SCICLK,0003
                                   // Disable RX ERR, SLEEP, TXWAKE
    SciaRegs.SCICTL2.all =0x0001;//0003
    SciaRegs.SCICTL2.bit.TXINTENA =1;
    //SciaRegs.SCICTL2.bit.RXBKINTENA =1;

    SciaRegs.SCIHBAUD    =0x01;  // 9600 baud @LSPCLK = 20MHz (80 MHz SYSCLK).
    SciaRegs.SCILBAUD    =0x03;

    SciaRegs.SCICTL1.all =0x0022;  // Relinquish SCI from Reset0023
}

// Transmit a character from the SCI
void scia_xmit(int a)
{
    while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {}
    //SciaRegs.SCICTL1.all =0x0022;
    SciaRegs.SCITXBUF=a;
    b=6;

}



// Initalize the SCI FIFO
void scia_fifo_init()
{
    SciaRegs.SCIFFTX.all=0xE040;
  //  SciaRegs.SCIFFRX.all=0x2044;
    SciaRegs.SCIFFCT.all=0x0;

}

void send_result(int res)
{

 b3 = (res/1000);
 b2 = ((res%1000)/100);
 b1 = ((res%100)/10);
 b0 = (res%10);
b3 = b3 + B3;
b2 = b2 + B2;
b1 = b1 + B1;
b0 = b0 + B0;
 DELAY_US(1000000);
 scia_xmit(b3);
 DELAY_US(1000000);
scia_xmit(b2);
DELAY_US(1000000);
scia_xmit(b1);
DELAY_US(1000000);
scia_xmit(b0);
DELAY_US(1000000);

 return;
}

//===========================================================================
// No more.
//===========================================================================