Recent posts to Hardware Watchdoghttps://forge.codesys.com/forge/talk/Engineering/thread/6288e0e398/2020-02-27T14:15:14.646000ZRecent posts to Hardware WatchdogHardware Watchdog2020-02-27T14:15:14.646000Z2020-02-27T14:15:14.646000ZDrongo96https://forge.codesys.com/u/drongo96/https://forge.codesys.com66aa0e6bcd1b8f8874e7722972ec653d331f93ff<div class="markdown_content"><p>Hello! I'm trying to work with hardware watchdog using ioctl, but nothing works.</p>
<p>As an example, I used the real time clock driver</p>
<p>var constant<br/>
RTC_RD_TIME: udint := 16#09;<br/>
RTC_SET_TIME: udint := 16#0a;<br/>
group: dword := 16#70;<br/>
IOC_OUT: dword := 16#80000000;<br/>
IOC_IN: dword := 16#40000000; <br/>
IOCPARM_MASK: dword := 16#1fff;<br/>
end_var</p>
<p>method private ReadRequest : dword<br/>
var_input<br/>
num: udint;<br/>
len: udint;<br/>
end_var</p>
<p>ReadRequest := IOC_OUT or ( shl( len and IOCPARM_MASK, 16 ) or ( shl( group, 8 ) or num ) );</p>
<p>method private WriteRequest : dword<br/>
var_input<br/>
num: udint;<br/>
len: udint;<br/>
end_var</p>
<p>WriteRequest := IOC_IN or ( shl( len and IOCPARM_MASK, 16 ) or ( shl( group, 8 ) or num ) );</p>
<p>// ...</p>
<p>hRtc := CDOpen( '/dev/rtc', CmpCharDevice.ACCESS_MODE.O_RDONLY, adr( Result ) );</p>
<p>if hRtc <> RTS_INVALID_HANDLE then</p>
<p>Request := dword_to_dint( ReadRequest( RTC_RD_TIME, sizeof( TRtcTime ) ) );</p>
<p>CDIoctl( hRtc, Request, dword_to_dint( adr( Read ) ), adr( Result ) );</p>
<p>CDClose( hRtc, adr( Result ) );</p>
<p>end_if</p>
<p>// ...</p>
<p>hRtc := CDOpen( '/dev/rtc', CmpCharDevice.ACCESS_MODE.O_WRONLY, adr( Result ) );</p>
<p>if hRtc <> RTS_INVALID_HANDLE then</p>
<p>Request := dword_to_dint( WriteRequest( RTC_SET_TIME, sizeof( TRtcTime ) ) );</p>
<p>CDIoctl( hRtc, Request, dword_to_dint( adr( rtctime ) ), adr( Result ) );</p>
<p>CDClose( hRtc, adr( Result ) );</p>
<p>end_if</p>
<p>can i use these macros to work with hardware watchdog?</p></div>