tms470r1a256_01.c

来自「TI TMS470 series mcu demo code」· C语言 代码 · 共 43 行

//*******************************************************************************
//  TMS470 Demo - Software Toggle HET0/31 Outputs
//
//  Description; Toggle Pins HET0/31 180o out of phase inside of a software loop.
//  ACLK = SYSCLK = MCLK = ICLK = 12MHz
//  //*An external 12Mhz XTAL on OSCIN OSCOUT with proper load caps required*//	
//
//              TMS-FET470A256
//             -----------------
//         /|\|            OSCIN|-
//          | |                 | 12MHz
//          --|PLLDIS     OSCOUT|-
//            |                 |
//            |             HET0|---> LED
//            |            HET31|---> 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 = 0x7FFFFFFF;                   // HET31 reset, else set

  for (;;)
  {
    volatile unsigned long i;
    HETDOUT ^= 0x80000001;                // HET31/0 Toggle
    for ( i = 0; i < 100000; i++ );
  }
}