tms470r1b1m_het_int_01.c

TMS-FET470B1M C Examples

//*****************************************************************************
//  TMS470 Demo - HET Interrupt Sample Program
//
//  Program name : tms470r1b1m_HET_INT_01.c, associated with
//                 HET program tms470r1b1m_HET_INT_01_H.het
//
//  Description; This program uses the HET to interrupt the CPU. The
//  interrupt in this example flashes the LEDs on HET0..7 on the EVM.
//
//  SYSCLK = MCLK = ACLK = 8 x 7.3728MHz = 58.9824MHz
//  ICLK = SYSCLK / 2 = 29.4912MHz
//
//  //*An external 7.3728MHz XTAL with proper load caps is required*//	
//
//              TMS-FET470B1M
//             -----------------
//            |            OSCIN|-
//            |                 | 7.3728MHz
//         +--|PLLDIS     OSCOUT|-
//         |  |                 |
//        -+- |          HET0..7|---> 8 HET LEDs
//            |                 |
//
//  J.Mangino / A.Dannenberg
//  Texas Instruments, Inc
//  July 29th 2005
//  Built with IAR Embedded Workbench Version: 4.30A
//******************************************************************************

#include <intrinsic.h>
#include "iotms470r1b1m.h"
#include "tms470r1b1m_bit_definitions.h"
#include "std_het.h"
#include "tms470r1b1m_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)
{
  PCR = CLKDIV_2;                               // ICLK = SYSCLK / 2
  GCR = ZPLL_CLK_DIV_PRE_1;                     // SYSCLK = 8 x fOSC
  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;                                // Int on instruction 1 is
                                                // high-priority
  HETPFR = 0x0000052b;                          // Set PFR register	

  HETDCLR = 0xffffffff;                         // Clear HET output latches
  HETDIR = 0xffffffff;                          // Set HET as GIO outputs

  HETGCR |= ON;                                 // Start HET

  __enable_interrupt();                         // Enable Interrupts

  while (1);                                    // Loop forever...
}
//------------------------------------------------------------------------------
// 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++;
}
//------------------------------------------------------------------------------
// TMS470R1B1M Standard Interrupt Handler
//------------------------------------------------------------------------------

__irq __arm void irq_handler(void)
{
  switch ((0xff & IRQIVEC)-1)
  {
   case CIM_HET1 :
     HET1_irq_handler();
     break;
  }
}
//------------------------------------------------------------------------------
// HET Instruction 0 Interrupt Handler
//------------------------------------------------------------------------------
void HET_CNT_INT()
{
  HETDOUT ^= 0xff;                              // Toggle HET0..7 LEDs
}
//------------------------------------------------------------------------------
// HET Interrupt Handler
//------------------------------------------------------------------------------
void HET1_irq_handler()
{
  switch ((0xff & HETOFF1)-1)
  {
    case 0 :                                    // Instruction 0
      HET_CNT_INT();
      break;
  }
}