tms470r1a256_gioa_01.c

tmp470开发板的源程序

//*******************************************************************************
//  TMS470 Demo - Software Poll GPIOA2/3 Toggling HET0/2
//
//  Description; Poll inputs GPIOA2/3 inverting in software on HET0/2 outputs.
//  ACLK = SYSCLK = MCLK = ICLK = 12MHz
//  //*An external 12Mhz XTAL on OSCIN OSCOUT with proper load caps required*//	
//
//              TMS-FET470A256
//             -----------------
//         /|\|            OSCIN|-
//          | |                 | 12MHz
//          --|PLLDIS     OSCOUT|-
//            |                 |
//        --->|GPIOA2       HET0|---> LED
//        --->|GPIOA3       HET2|---> LED
//            |                 |
//
//  M.Buccini/J.Mangino
//  Texas Instruments, Inc
//  January 2005
//  Built with IAR Embedded Workbench Version: 4.20A
//******************************************************************************

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

void main(void)
{
  PCR = CLKDIV_1;                         // ICLK = SYSCLK
  PCR |= PENABLE;                         // enable peripherals

  HETDIR  = 0xFFFFFFFF;                   // HETx Output direction
  HETDOUT = 0xFFFFFFFF;

  for (;;)
  {
    if (!(GIODINA & 0x4)) HETDOUT &= ~0x1;
    else HETDOUT |= 0x01;

    if (!(GIODINA & 0x8)) HETDOUT &= ~0x4;
    else HETDOUT |= 0x04;
  }
}