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Explain the need for using the assembler gettime operation instead of an XC timer more fully.

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Michael Banther
2019-12-05 16:45:49 +00:00
parent 255e9f75b5
commit 83284620cc
1 changed files with 4 additions and 1 deletions
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5
lib_xua/src/hid/hid.xc
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@@ -57,7 +57,10 @@ unsigned HidIsSetIdleSilenced( void )
if( s_hidIdleActive ) { if( s_hidIdleActive ) {
unsigned currentTime; unsigned currentTime;
asm volatile( "gettime %0" : "=r" ( currentTime )); // Use inline assembly to access the time without creating a side-effect // Use inline assembly to access the time without creating a side-effect.
// The mapper complains if the time comes from an XC timer because this function is called in the guard of a select case.
// Appearently the use of a timer creates a side-effect that prohibits the operation of the select functionality.
asm volatile( "gettime %0" : "=r" ( currentTime ));
isSilenced = ( s_hidIndefiniteDuration || ( timeafter( s_hidNextReportTime, currentTime ))); isSilenced = ( s_hidIndefiniteDuration || ( timeafter( s_hidNextReportTime, currentTime )));
} }