diff --git a/portable/MSVC-MingW/port.c b/portable/MSVC-MingW/port.c index c6ee941c8f5..9ce0c1b1582 100644 --- a/portable/MSVC-MingW/port.c +++ b/portable/MSVC-MingW/port.c @@ -141,6 +141,9 @@ static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter ) { TickType_t xMinimumWindowsBlockTime; TIMECAPS xTimeCaps; + TickType_t xWaitTimeBetweenTicks = portTICK_PERIOD_MS; + HANDLE hTimer = NULL; + LARGE_INTEGER liDueTime; /* Set the timer resolution to the maximum possible. */ if( timeGetDevCaps( &xTimeCaps, sizeof( xTimeCaps ) ) == MMSYSERR_NOERROR ) @@ -160,22 +163,33 @@ static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter ) /* Just to prevent compiler warnings. */ ( void ) lpParameter; + /* Tick time for the timer is adjusted with the maximum available + resolution. */ + if( portTICK_PERIOD_MS < xMinimumWindowsBlockTime ) + { + xWaitTimeBetweenTicks = xMinimumWindowsBlockTime; + } + + /* Convert the tick time in milliseconds to nanoseconds resolution + for the Waitable Timer. */ + liDueTime.u.LowPart = xWaitTimeBetweenTicks * 1000 * 1000; + liDueTime.u.HighPart = 0; + + /* Create a synchronization Waitable Timer.*/ + hTimer = CreateWaitableTimer( NULL, FALSE, NULL ); + + configASSERT( hTimer != NULL ); + + /* Set the Waitable Timer. The timer is set to run periodically at every + xWaitTimeBetweenTicks milliseconds. */ + configASSERT( SetWaitableTimer( hTimer, &liDueTime, xWaitTimeBetweenTicks, NULL, NULL, 0 ) ); + while( xPortRunning == pdTRUE ) { /* Wait until the timer expires and we can access the simulated interrupt - * variables. *NOTE* this is not a 'real time' way of generating tick - * events as the next wake time should be relative to the previous wake - * time, not the time that Sleep() is called. It is done this way to - * prevent overruns in this very non real time simulated/emulated - * environment. */ - if( portTICK_PERIOD_MS < xMinimumWindowsBlockTime ) - { - Sleep( xMinimumWindowsBlockTime ); - } - else - { - Sleep( portTICK_PERIOD_MS ); - } + * variables. */ + + WaitForSingleObject( hTimer, INFINITE ); vPortGenerateSimulatedInterruptFromWindowsThread( portINTERRUPT_TICK ); }