/* Delay x useconds */
void __udelay(unsigned long usec)
{
ulong ini, end;
ini = READ_TIMER();
end = ini + USEC_TO_COUNT(usec);
while ((signed)(end - READ_TIMER()) > 0)
;
}
/* delay x useconds */
void __udelay(unsigned long usec)
{
long tmo = USEC_TO_COUNT(usec);
ulong now, last = read_timer();
while (tmo > 0) {
now = read_timer();
if (now > last) /* normal (non rollover) */
tmo -= now - last;
else /* rollover */
tmo -= TIMER_LOAD_VAL - last + now;
last = now;
}
}
/** Set interrupt for specified timestamp
*
* @param timestamp The time in microseconds to be set
*/
void lp_ticker_set_interrupt(timestamp_t timestamp)
{
uint32_t now_us, delta_us, delta_ticks;
if (!lp_ticker_inited) {
lp_ticker_init();
}
lptmr_schedule = 0;
now_us = lp_ticker_read();
delta_us = timestamp > now_us ? timestamp - now_us : (uint32_t)((uint64_t)timestamp + 0xFFFFFFFF - now_us);
/* Checking if LPTRM can handle this sleep */
delta_ticks = USEC_TO_COUNT(delta_us, CLOCK_GetFreq(kCLOCK_Er32kClk));
if (delta_ticks > MAX_LPTMR_SLEEP) {
/* Using RTC if wait time is over 16b (2s @32kHz) */
uint32_t delta_sec;
delta_us += COUNT_TO_USEC(RTC->TPR, CLOCK_GetFreq(kCLOCK_Er32kClk)); /* Accounting for started second */
delta_sec = delta_us / SEC_IN_USEC;
delta_us -= delta_sec * SEC_IN_USEC;
RTC->TAR = RTC->TSR + delta_sec - 1;
RTC_EnableInterrupts(RTC, kRTC_AlarmInterruptEnable);
/* Set aditional, subsecond, sleep time */
if (delta_us) {
lptmr_schedule = USEC_TO_COUNT(delta_us, CLOCK_GetFreq(kCLOCK_Er32kClk));
}
} else {
/* Below RTC resolution using LPTMR */
LPTMR_SetTimerPeriod(LPTMR0, delta_ticks);
LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
LPTMR_StartTimer(LPTMR0);
}
}
/*!
* @brief Main function
*/
int main(void)
{
uint32_t currentCounter = 0U;
lptmr_config_t lptmrConfig;
LED_INIT();
/* Board pin, clock, debug console init */
BOARD_InitPins();
BOARD_BootClockRUN();
BOARD_InitDebugConsole();
/* Configure LPTMR */
/*
* lptmrConfig.timerMode = kLPTMR_TimerModeTimeCounter;
* lptmrConfig.pinSelect = kLPTMR_PinSelectInput_0;
* lptmrConfig.pinPolarity = kLPTMR_PinPolarityActiveHigh;
* lptmrConfig.enableFreeRunning = false;
* lptmrConfig.bypassPrescaler = true;
* lptmrConfig.prescalerClockSource = kLPTMR_PrescalerClock_1;
* lptmrConfig.value = kLPTMR_Prescale_Glitch_0;
*/
LPTMR_GetDefaultConfig(&lptmrConfig);
/* Initialize the LPTMR */
LPTMR_Init(LPTMR0, &lptmrConfig);
/* Set timer period */
LPTMR_SetTimerPeriod(LPTMR0, USEC_TO_COUNT(1000000U, LPTMR_SOURCE_CLOCK));
/* Enable timer interrupt */
LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
/* Enable at the NVIC */
EnableIRQ(LPTMR0_IRQn);
PRINTF("Low Power Timer Example\r\n");
/* Start counting */
LPTMR_StartTimer(LPTMR0);
while (1)
{
if (currentCounter != lptmrCounter)
{
currentCounter = lptmrCounter;
PRINTF("LPTMR interrupt No.%d \r\n", currentCounter);
}
}
}
/*!
* @brief Main function
*/
int main(void)
{
/* Structure of initialize PIT */
pit_config_t pitConfig;
/* Initialize and enable LED */
LED_INIT();
/* Board pin, clock, debug console init */
BOARD_InitPins();
BOARD_BootClockRUN();
BOARD_InitDebugConsole();
/*
* pitConfig.enableRunInDebug = false;
*/
PIT_GetDefaultConfig(&pitConfig);
/* Init pit module */
PIT_Init(PIT, &pitConfig);
/* Set timer period for channel 0 */
PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, USEC_TO_COUNT(1000000U, PIT_SOURCE_CLOCK));
/* Enable timer interrupts for channel 0 */
PIT_EnableInterrupts(PIT, kPIT_Chnl_0, kPIT_TimerInterruptEnable);
/* Enable at the NVIC */
EnableIRQ(PIT_IRQ_ID);
/* Start channel 0 */
PRINTF("\r\nStarting channel No.0 ...");
PIT_StartTimer(PIT, kPIT_Chnl_0);
while (true)
{
/* Check whether occur interupt and toggle LED */
if (true == pitIsrFlag)
{
PRINTF("\r\n Channel No.0 interrupt is occured !");
LED_TOGGLE();
pitIsrFlag = false;
}
}
}
ulong usec2ticks(unsigned long usec)
{
return USEC_TO_COUNT(usec);
}
