wd.c

最新版IAR FOR ARM（EWARM）5.11中的代码例子

/*************************************************************************
 *
 *    Used with ICCARM and AARM.
 *
 *    (c) Copyright IAR Systems 2007
 *
 *    File name   : wd.c
 *    Description : Main file
 *
 *    History :
 *    1. Date        : August 2, 2007
 *       Author      : Stanimir Bonev
 *       Description : Create
 *
 *  This example project shows how to use the IAR Embedded Workbench for ARM
 * to develop code for the Samsung-S3F4A0K evaluation board. It shows
 * basic use of WDT.
 *  The example flashing LED DS4 (P1.9) when WDT pended and cleared
 *
 *    $Revision: 18083 $
 **************************************************************************/

#include <samsung\ios3f4a0k.h>
#include "arm_comm.h"
#include "board.h"

/*************************************************************************
 * Function Name: main
 * Parameters: none
 * Return: none
 *
 * Description: Main
 *
 *************************************************************************/
void main (void)
{
  // WDT init
  // LFCLK = 250kHz (OSC/(MDIV*VFDIV))
  // WD Period - 1s = WDPDIV * (PCV[15:0]+1)/LFCLK
  // WDPDIV = /8; PCV = 31249
  WD_MR = (0x37UL << 24) | ((31250-1) << 8) | 2;
  // Set Pending Windows period 0.5 s
  // PWL = 15625-1, Restart allowed only within pending window
  WD_PWR = (0x91UL << 24) | ((15625-1)<<8) | 1;
  // Clear flags
  WD_CSR = 3;
  // WD restart
  WD_CR = 0xC071;
  // WD enable
  WD_OMR = (0x234UL << 4) | 1;
  // Enable PIO block
  // PIO Software Reset
  PIO1_CR = 1;
  // P1.9 is PIO
  PIO1_PER  = 1 << 9;
  // Enable Push-pull
  PIO1_MDDR = 1 << 9;
  // Set P1.9 to output
  PIO1_OER  = 1 << 9;
  // Clear output (LED off)
  PIO1_CODR = 1 << 9;

  while(1)
  {
    if(WD_SR_bit.WDPEND)
    {
      // Clear flags
      WD_CSR = 3;
      // WD restart
      WD_CR = 0xC071;
      // toggle P1.9
      PIO1_WODR = PIO1_ODSR ^ (1<<9);
    }
  }
}