/*********************************************************************
* @fn osalTimeUpdate
*
* @brief Uses the free running rollover count of the MAC backoff timer;
* this timer runs freely with a constant 320 usec interval. The
* count of 320-usec ticks is converted to msecs and used to update
* the OSAL clock and Timers by invoking osalClockUpdate() and
* osalTimerUpdate(). This function is intended to be invoked
* from the background, not interrupt level.
*
* @param None.
*
* @return None.
*/
void osalTimeUpdate( void )
{
uint16 tmp;
uint16 ticks320us;
uint16 elapsedMSec = 0;
// Get the free-running count of 320us timer ticks
tmp = macMcuPrecisionCount();
if ( tmp != previousMacTimerTick )
{
// Calculate the elapsed ticks of the free-running timer.
ticks320us = tmp - previousMacTimerTick;
// Store the MAC Timer tick count for the next time through this function.
previousMacTimerTick = tmp;
/* It is necessary to loop to convert the usecs to msecs in increments so as
* not to overflow the 16-bit variables.
*/
while ( ticks320us > MAXCALCTICKS )
{
ticks320us -= MAXCALCTICKS;
elapsedMSec += MAXCALCTICKS * 8 / 25;
remUsTicks += MAXCALCTICKS * 8 % 25;
}
// update converted number with remaining ticks from loop and the
// accumulated remainder from loop
tmp = (ticks320us * 8) + remUsTicks;
// Convert the 320 us ticks into milliseconds and a remainder
elapsedMSec += tmp / 25;
remUsTicks = tmp % 25;
// Update OSAL Clock and Timers
if ( elapsedMSec )
{
osalClockUpdate( elapsedMSec );
osalTimerUpdate( elapsedMSec );
}
}
}
/*********************************************************************
* @fn osalTimeUpdate
*
* @brief Uses the free running rollover count of the MAC backoff timer;
* this timer runs freely with a constant 320 usec interval. The
* count of 320-usec ticks is converted to msecs and used to update
* the OSAL clock and Timers by invoking osalClockUpdate() and
* osalTimerUpdate(). This function is intended to be invoked
* from the background, not interrupt level.
*
* @param None.
*
* @return None.
*/
void osalTimeUpdate( void ){
halIntState_t intState;
uint32 tmp;
uint32 ticks320us;
uint32 elapsedMSec = 0;
HAL_ENTER_CRITICAL_SECTION(intState);
// Get the free-running count of 320us timer ticks
tmp = macMcuPrecisionCount();
HAL_EXIT_CRITICAL_SECTION(intState);
if ( tmp != previousMacTimerTick ) {
// Calculate the elapsed ticks of the free-running timer.
ticks320us = (tmp - previousMacTimerTick) & 0xffffffffu;
if (ticks320us >= TIMER_CLOCK_UPDATE ) {
// Store the MAC Timer tick count for the next time through this function.
previousMacTimerTick = tmp;
/*
* remUsTicks can have a maximum value of 24 (Since remusTicks got by mod
* of 25). The value of COUNTER_TICK320US is a multiple of 25 and the
* quotient of CONVERT_320US_TO_MS_ELAPSED_REMAINDER() does not exceed
* 0xFFFF or 16 bit.
*/
while(ticks320us >= COUNTER_TICK320US) {
ticks320us -= COUNTER_TICK320US;
elapsedMSec += COUNTER_ELAPSEDMS;
}
// update converted number with remaining ticks from loop and the accumulated remainder from loop
tmp = (ticks320us * 8) + remUsTicks;
// Convert the 320 us ticks into milliseconds and a remainder
CONVERT_320US_TO_MS_ELAPSED_REMAINDER( tmp, elapsedMSec, remUsTicks );
// Update OSAL Clock and Timers
osalClockUpdate( elapsedMSec );
osalTimerUpdate( elapsedMSec );
}
}
}
