//###########################################################################
//
// FILE:    Example_2802xLedBlink.c
//
// TITLE:   f2802x LED Blink Getting Started Program.
//
// ASSUMPTIONS:
//
//    This program requires the f2802x header files.
//    As supplied, this project is configured for "boot to SARAM"
//    operation.  The 2802x 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	         0x0002
//      Get_Mode	 0x55AA	         0x0003
//      SPI		     0x55AA	         0x0004
//      I2C		     0x55AA	         0x0005
//      OTP		     0x55AA	         0x0006
//      Wait		 0x55AA	         0x0007
//      Wait		 0x55AA	         0x0008
//      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 example configures CPU Timer0 for a 500 msec period, and toggles the
//    GPIO34 LED  once per interrupt. For testing purposes, this example
//    also increments a counter each time the timer asserts an interrupt.
//
//       Watch Variables:
//          CpuTimer0.InterruptCount
//
//       Monitor the GPIO34 LED blink on (for 500 msec) and off (for 500 msec)
//       on the 2802x control card.
//
//###########################################################################
// $TI Release:  $
// $Release Date:  $
// $Copyright:
// Copyright (C) 2009-2026 Texas Instruments Incorporated - http://www.ti.com/
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions 
// are met:
// 
//   Redistributions of source code must retain the above copyright 
//   notice, this list of conditions and the following disclaimer.
// 
//   Redistributions in binary form must reproduce the above copyright
//   notice, this list of conditions and the following disclaimer in the 
//   documentation and/or other materials provided with the   
//   distribution.
// 
//   Neither the name of Texas Instruments Incorporated nor the names of
//   its contributors may be used to endorse or promote products derived
//   from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// $
//###########################################################################

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

//
// Function Prototypes
//
__interrupt void cpu_timer0_isr(void);

//
// Main
//
void main(void)
{
    //
    // WARNING: Always ensure you call memcpy before running any functions from
    // RAM InitSysCtrl includes a call to a RAM based function and without a 
    // call to memcpy first, the processor will go "into the weeds"
    //
#ifdef _FLASH
    memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif

    //
    // Step 1. Initialize System Control:
    // PLL, WatchDog, enable Peripheral Clocks
    // This example function is found in the f2802x_SysCtrl.c file.
    //
    InitSysCtrl();

    //
    // Step 2. Initialize GPIO:
    // This example function is found in the f2802x_Gpio.c file and
    // illustrates how to set the GPIO to it's default state.
    //
    //InitGpio();  // Skipped for this example

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

    //
    // Initialize the 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 f2802x_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 f2802x_DefaultIsr.c.
    // This function is found in f2802x_PieVect.c.
    //
    InitPieVectTable();

    //
    // Interrupts that are used in this example are re-mapped to
    // ISR functions found within this file.
    //
    EALLOW;    // This is needed to write to EALLOW protected registers
    PieVectTable.TINT0 = &cpu_timer0_isr;
    EDIS;      // This is needed to disable write to EALLOW protected registers

    //
    // Step 4. Initialize the Device Peripheral. This function can be
    // found in f2802x_CpuTimers.c
    //
    
    //
    // For this example, only initialize the Cpu Timers
    //
    InitCpuTimers();
    
    //
    // Configure CPU-Timer 0 to interrupt every 500 milliseconds:
    // 60MHz CPU Freq, 50 millisecond Period (in uSeconds)
    //
    ConfigCpuTimer(&CpuTimer0, 60, 500000);

    //
    // To ensure precise timing, use write-only instructions to write to the
    // entire register. Therefore, if any of the configuration bits are changed
    // in ConfigCpuTimer and InitCpuTimers (in f2802x_CpuTimers.h), the
    // below settings must also be updated.
    //
    
    //
    // Use write-only instruction to set TSS bit = 0
    //
    CpuTimer0Regs.TCR.all = 0x4001;

    //
    // Step 5. User specific code, enable interrupts
    //

    //
    // Configure GPIO12 (blue LED) and GPIO33 (red LED) as GPIO output pins
    //
    EALLOW;
    GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 0;
    GpioCtrlRegs.GPADIR.bit.GPIO12 = 1;
    GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 0;
    GpioCtrlRegs.GPBDIR.bit.GPIO33 = 1;
    GpioDataRegs.GPACLEAR.bit.GPIO12 = 1;
    GpioDataRegs.GPBCLEAR.bit.GPIO33 = 1;
    EDIS;

    //
    // Enable CPU INT1 which is connected to CPU-Timer 0
    //
    IER |= M_INT1;

    //
    // Enable TINT0 in the PIE: Group 1 interrupt 7
    //
    PieCtrlRegs.PIEIER1.bit.INTx7 = 1;

    //
    // Enable global Interrupts and higher priority real-time debug events
    //
    EINT;           // Enable Global interrupt INTM
    ERTM;           // Enable Global realtime interrupt DBGM

    //
    // Step 6. IDLE loop. Just sit and loop forever (optional)
    //
    for(;;);
}

//
// cpu_timer0_isr -
//
__interrupt void
cpu_timer0_isr(void)
{
    static Uint16 ledState = 0;

    CpuTimer0.InterruptCount++;

    //
    // Alternate between the blue LED (GPIO12) and the red LED (GPIO33) every 500 milliseconds
    //
    if (ledState == 0)
    {
        GpioDataRegs.GPASET.bit.GPIO12 = 1;
        GpioDataRegs.GPBCLEAR.bit.GPIO33 = 1;
    }
    else
    {
        GpioDataRegs.GPACLEAR.bit.GPIO12 = 1;
        GpioDataRegs.GPBSET.bit.GPIO33 = 1;
    }
    ledState = (ledState + 1) % 2;

    //
    // Acknowledge this interrupt to receive more interrupts from group 1
    //
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

//
// End of File
//