len0rd/FreeRTOS-Kernel
1
0
Fork 0
mirror of https://github.com/FreeRTOS/FreeRTOS-Kernel.git synced 2025-04-19 21:11:57 -04:00
Code Issues Packages Projects Releases Wiki Activity

Revert "Fix inaccurate ticks in windows port (#142)" (#143)

Browse source 
This reverts commit d85fd461d9.
This commit is contained in:
Cobus van Eeden 2020-08-27 12:06:03 -07:00 committed by GitHub
parent d85fd461d9
commit d7fd5a1195
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 14 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
portable/MSVC-MingW/port.c
View file

@ -22,6 +22,7 @@
* https://www.FreeRTOS.org * https://www.FreeRTOS.org
* https://github.com/FreeRTOS * https://github.com/FreeRTOS
* *
* 1 tab == 4 spaces!
*/ */
/* Standard includes. */ /* Standard includes. */
@ -139,9 +140,6 @@ static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter )
{ {
TickType_t xMinimumWindowsBlockTime; TickType_t xMinimumWindowsBlockTime;
TIMECAPS xTimeCaps; TIMECAPS xTimeCaps;
TickType_t xWaitTimeBetweenTicks = portTICK_PERIOD_MS;
HANDLE hTimer = NULL;
LARGE_INTEGER liDueTime;
/* Set the timer resolution to the maximum possible. */ /* Set the timer resolution to the maximum possible. */
if( timeGetDevCaps( &xTimeCaps, sizeof( xTimeCaps ) ) == MMSYSERR_NOERROR ) if( timeGetDevCaps( &xTimeCaps, sizeof( xTimeCaps ) ) == MMSYSERR_NOERROR )
@ -161,32 +159,22 @@ LARGE_INTEGER liDueTime;
/* Just to prevent compiler warnings. */ /* Just to prevent compiler warnings. */
( void ) lpParameter; ( 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 ) );
for( ;; ) for( ;; )
{ {
/* Wait until the timer expires and we can access the simulated interrupt /* Wait until the timer expires and we can access the simulated interrupt
variables. */ variables. *NOTE* this is not a 'real time' way of generating tick
WaitForSingleObject( hTimer, INFINITE ); 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 );
}
configASSERT( xPortRunning ); configASSERT( xPortRunning );