IO Device:81801

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(→SDK Reference Code Introduction)
(→Enable WDT Function)
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SetPortVal(INDEXPORT, WDTTDE, 1);<br />
SetPortVal(INDEXPORT, WDTTDE, 1);<br />
SetPortVal(DATAPORT, 0x01, 1);<br />
SetPortVal(DATAPORT, 0x01, 1);<br />
-
SetPortVal(INDEXPORT, WDTC, 1);<br />
+
SetPortVal(INDEXPORT, WTE, 1);//WDT timer enable register <br />
 +
SetPortVal(DATAPORT, 0x80, 1);<br />
 +
SetPortVal(INDEXPORT, WDTC, 1);<br />
SetPortVal(DATAPORT, timer, 1);//System will reboot after timer sec.<br />
SetPortVal(DATAPORT, timer, 1);//System will reboot after timer sec.<br />
SetPortVal(INDEXPORT, WDTUS, 1);<br />
SetPortVal(INDEXPORT, WDTUS, 1);<br />
Line 51: Line 53:
else MessageBox(NULL,TEXT("Error for WinIO init error!!"));
else MessageBox(NULL,TEXT("Error for WinIO init error!!"));
}
}
 +
== Disable WDT Function ==
== Disable WDT Function ==
void CMy81801UWDTDlg::WDTDisable(void)
void CMy81801UWDTDlg::WDTDisable(void)

Revision as of 13:31, 16 August 2010

Contents

The Sample code source you can download from

Source file: 81801UWDTw_src_v11.rar

Binary file: 81801UWDTw_bin_v11.rar

How to use the DEMO Application

Image:81801WDT.jpg

  • Step 1:Key-in the 1~255 value in Red number 1.
  • Step 2:Press the "WDT Enable" button in Red number 2,the system will reboot after step 1 you key-in Sec.
  • Step 3:Press the "WDT Disable" button in Red number 3,It will stop WDT function.

So you can make the loop with Enable and Disable to protection your system when crash.

SDK Reference Code Introduction

Define for 81801U register,in datasheet F81801U_V0.13P.pdf page 47 and page 60,The page 60 have mistake for Index,So that need to change to

  • Configuration Register Index 00h to F0h
  • Watchdog Timer Configuration Register 1 Index 05h to F5h
  • Watchdog Timer Configuration Register 2 Index 06h to F6h

define ENTRYKEY 0x87
define INDEXPORT 0x2e
define DATAPORT 0x2f
define LDNSET 0x07
define WDTTDE 0x30
define WTE 0xf0
define WDTC 0xf6
define WDTUS 0xf5

Enable WDT Function


void CMy81801UWDTDlg::WDTenable(int timer) { 

 DWORD dwPortVal;
 DWORD dwMemVal;
 bool bResult;
 bResult = InitializeWinIo();
 if (bResult)
 {		/*Enter configuration is write twice data 0x87 into Configuration Index Port.*/

SetPortVal(INDEXPORT, ENTRYKEY,1);
SetPortVal(INDEXPORT, ENTRYKEY,1);
SetPortVal(INDEXPORT, LDNSET, 1);
SetPortVal(DATAPORT, 0x07, 1);
SetPortVal(INDEXPORT, WDTTDE, 1);
SetPortVal(DATAPORT, 0x01, 1);

               SetPortVal(INDEXPORT, WTE,	   1);//WDT timer enable register

SetPortVal(DATAPORT, 0x80, 1);

               SetPortVal(INDEXPORT, WDTC,    1);

SetPortVal(DATAPORT, timer, 1);//System will reboot after timer sec.
SetPortVal(INDEXPORT, WDTUS, 1);
SetPortVal(DATAPORT, 0x31, 1);
ShutdownWinIo();}

 else MessageBox(NULL,TEXT("Error for WinIO init error!!"));

}

Disable WDT Function

void CMy81801UWDTDlg::WDTDisable(void) { 

 DWORD dwPortVal;
 DWORD dwMemVal;
 bool bResult;

 bResult = InitializeWinIo();
 if (bResult)
 {

SetPortVal(INDEXPORT, WDTUS, 1);
SetPortVal(DATAPORT, 0x51, 1);
ShutdownWinIo();

 }
 else MessageBox(NULL,TEXT("Error for WinIO init error!!"));

}

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