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

Reinstate "Fix inaccurate ticks in windows port"

Browse source 
Reinstates PR https://github.com/FreeRTOS/FreeRTOS-Kernel/pull/142 that was reverted in https://github.com/FreeRTOS/FreeRTOS-Kernel/pull/143
This commit is contained in:
Ben Nicholls 2024-11-28 08:53:22 +11:00 committed by Ben Nicholls
parent ad4e723829
commit 3171dea155
1 changed files with 27 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

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

@ -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 );
}