/*FUNCTION**********************************************************************
*
* Function Name : PIT_DRV_StartTimer
* Description : Start timer counting.
* After calling this function, timers load period value, count down to 0 and
* then load the respective start value again. Each time a timer reaches 0,
* it will generate a trigger pulse and set the timeout interrupt flag.
*
*END**************************************************************************/
void PIT_DRV_StartTimer(uint32_t instance, uint32_t channel)
{
assert(instance < PIT_INSTANCE_COUNT);
PIT_Type * base = g_pitBase[instance];
PIT_HAL_StartTimer(base, channel);
}
/*FUNCTION**********************************************************************
*
* Function Name : PIT_DRV_InitUs
* Description : Initializes two PIT channels to serve as a microseconds unit.
* This function is in parallel with PIT_DRV_InitChannel, they will overwrite
* each other. PIT_DRV_Init must be called before calling this function.
* The microseconds unit will use two chained channels to simulate a lifetime
* timer, the channel number passed in and the "channel -1" channel will be used.
* Note:
* 1. These two channels will be occupied and could not be used with other purposes.
* 2. The channel number passed in must be greater than 0.
*END**************************************************************************/
void PIT_DRV_InitUs(uint32_t instance, uint32_t channel)
{
assert(instance < PIT_INSTANCE_COUNT);
assert(channel > 0U);
PIT_Type * base = g_pitBase[instance];
g_pitUsInstance = instance;
g_pitUsChannel = channel;
PIT_HAL_SetTimerChainCmd(base, channel, true);
PIT_HAL_SetTimerPeriodByCount(base, channel, 0xFFFFFFFFU);
PIT_HAL_SetTimerPeriodByCount(base, channel - 1U, 0xFFFFFFFFU);
PIT_HAL_StartTimer(base, channel);
PIT_HAL_StartTimer(base, channel - 1U);
}
/*!
* @cond DOXYGEN_PRIVATE
*
* @brief Start pit timer module
*
* This function enables the timer and leaves it running, timer is
* periodically generating interrupts.
*
* @param hwtimer[in] Pointer to hwtimer structure.
*
* @return kHwtimerSuccess Success.
*
* @see HWTIMER_SYS_PitInit
* @see HWTIMER_SYS_PitDeinit
* @see HWTIMER_SYS_PitSetDiv
* @see HWTIMER_SYS_PitStop
* @see HWTIMER_SYS_PitGet_time
* @see HWTIMER_SYS_PitIsr
* @see HWTIMER_SYS_PitIsrShared
*/
static _hwtimer_error_code_t HWTIMER_SYS_PitStart(hwtimer_t * hwtimer)
{
uint32_t pitChannel;
uint32_t baseAddr = g_pitBaseAddr[0];
assert(NULL != hwtimer);
pitChannel = hwtimer->llContext[0U];
assert(pitChannel < FSL_FEATURE_PIT_TIMER_COUNT);
PIT_HAL_StopTimer(baseAddr, pitChannel);
PIT_HAL_ClearIntFlag(baseAddr, pitChannel);
PIT_HAL_SetIntCmd(baseAddr, pitChannel, true);
PIT_HAL_StartTimer(baseAddr, pitChannel);
return kHwtimerSuccess;
}
/*!
* @brief Function ltc_timer_start start pit timer.
*/
static void ltc_timer_start(void)
{
PIT_HAL_StartTimer(pitBase[0], LTC_TIMER_PIT_CHANNEL);
}
