tms470r1b1m_het_pcnt_01.c

TMS-FET470B1M C Examples

//******************************************************************************
//  TMS470 Demo - HET used to determine a pulse width
//
//  Program name : tms470r1b1m_HET_PCNT_01.c, associated with
//                 HET program tms470r1b1m_HET_PCNT_01_H.het
//
//  Description; Using the PCNT instruction the HET will determine the width
//  of a Pulse. The pulse is generated by the HET on HET0 and read into the HET
//  on HET1. When the pusle width is valid the HET will trigger an interrupt.
//  At this point the data may be viewed. Pins HET0 (CC0) and HET1 (CC1) must be
//  connected. You may use the jumpers to connect these two pins together.
//  Set a breakpoint on the HETGCR |= ON; instruction in the HET1_Pin0_handler()
//  function and open a watch window and put tmp in the expression location.
//  You may set the format to HEX so you can see 0x2000 in the value window.
//
//  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|---+
//            |                 |   |
//            |             HET1|---+
//            |                 |
//
//  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_PCNT_01_H.h"

volatile unsigned int tmp;
__no_init volatile HETPROGRAM0_UN e_HETPROGRAM0_UN @ 0x00800000;

void MemCopy32(unsigned long *dst, unsigned long *src, int bytes)
{
  for (int i = 0; i < (bytes + 3) / 4; i++)
    *dst++ = *src++;
}

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

  // Copy HET instructions to HET RAM
  MemCopy32((void *)&e_HETPROGRAM0_UN, (void *)HET_INIT0_PST,
            sizeof(HET_INIT0_PST));

  HETGCR = CLK_MASTER + IGNORE_SUSPEND;   // HET Master Mode, Ignore SW BP
  HETPRY = 0x08;                          // Int on instr. 3 is high-priority
  HETPFR = 0x0000052b;                    // Set PFR register	

  HETDCLR = 0xffffffff;                   // Clear HET output latches
  HETDIR = 0xfffffffe;                    // Set HET pin directions

  __enable_interrupt();                   // Enable Interrupts
  HETGCR |= ON;                           // Start HET

  while (1);                              // Loop forever...
}
//------------------------------------------------------------------------------
void HET1_Pin0_handler()
{
  HETGCR &= ~ON;
  tmp = HET_L03_0.memory.control_word & 0x000FFFFF;
  HETGCR |= ON;                          // Set breakpoint >>HERE<<
}                                        // and read out 'tmp'
//------------------------------------------------------------------------------
void HET1_irq_handler()
{
  switch ((0xff & HETOFF1)-1)
  {
    case 3 :
      HET1_Pin0_handler();
      break;
  }
}
//------------------------------------------------------------------------------
// TMS470R1B1M Standard Interrupt Handler
//------------------------------------------------------------------------------
__irq __arm void irq_handler(void)
{
  switch ((0xff & IRQIVEC)-1)
  {
    case CIM_HET1 :
      HET1_irq_handler();
      break;
  }
}