//*****************************************************************************
//  TMS470 Demo - HET Interrupt Sample Program
//
//  Program name : HET_INT_01.c associated with HET program HET_INT_01_H.het
//
//  Description; This program uses the HET to interrupt the CPU. The
//  interrupt in this example flashes the LED bank on the A256 EVM.
//
//  *An external 12Mhz XTAL on OSCIN OSCOUT with proper load caps required*
//
//              TMS-FET470A256
//             -----------------
//         /|\|            OSCIN|-
//          | |                 | 12MHz
//          --|PLLDIS     OSCOUT|-
//            |                 |
//        >---|ADIN0         HET|---> 10 LEDs
//            |                 |
//
//  John Mangino / Lane Westlund
//  Texas Instruments, Inc
//  May 2005
//  Built with IAR Embedded Workbench Version: 4.20A
//  A256 EVM
//******************************************************************************

#include <intrinsic.h>
#include "iotms470r1a256.h"
#include "tms470r1a256_bit_definitions.h"
#include "std_het.h"
#include "HET_INT_01_H.h"

__no_init volatile HETPROGRAM0_UN e_HETPROGRAM0_UN @ 0x00800000;


void MemCopy32(unsigned long *dst, unsigned long *src, int bytes);
void HET_CNT_INT();
void HET1_irq_handler();

void main(void)
{
 // Set up peripheral registers.

  PCR = CLKDIV_1;                        // ICLK = SYSCLK/4
  PCR |= PENABLE;                        // enable peripherals

  REQMASK=(1 << CIM_HET1);               // Enable HET Interrupt mask

  HETGCR = CLK_MASTER + IGNORE_SUSPEND;  //  HET Master Mode, Ignore SW BP

  // copy HET instructions to HET ram

  MemCopy32((void *) &e_HETPROGRAM0_UN, (void *) HET_INIT0_PST, sizeof(HET_INIT0_PST));

  HETPRY = 0x01;                         // enable interrupt for instruction 1
  HETPFR = 0x0000052b;                   // Set PFR register	

  HETDIR  = 0xFFFFFFFF;                  // Set all HET as GIO outputs
  HETDOUT = 0xFFFFFFFF;                  // Flash all leds off and on and off

  HETGCR |= ON;                          // Start HET

  __enable_interrupt();                  // Enable Interrupts

  while(1);
}

//------------------------------------------------------------------------------
// This module programms the HET RAM with the HET code
//------------------------------------------------------------------------------
 void MemCopy32(unsigned long *dst, unsigned long *src, int bytes)
{
  for (int i = 0; i < (bytes + 3) / 4; i++)
    *dst++ = *src++;
}


//------------------------------------------------------------------------------
// TMS470R1A256 Standard Interrupt Handler
//------------------------------------------------------------------------------
#pragma vector = IRQV
__irq __arm void irq_handler(void)
{
   switch((0xff & IRQIVEC)-1)
  {
   case CIM_HET1  : HET1_irq_handler(); break; // Check for the HET interrupt
  }
}

//------------------------------------------------------------------------------
// Flash the LED code
//------------------------------------------------------------------------------
void HET_CNT_INT()
{
  HETDOUT ^= 0xFFFFFFFF;                       // Flash LEDs
}

//------------------------------------------------------------------------------
// HET Interrupt Handler
//------------------------------------------------------------------------------
void HET1_irq_handler()
{
    switch((0xff & HETOFF1)-1)
  {
   case 0 : HET_CNT_INT(); break;               // Check which the HET interrupt
  }
}