void us_ticker_init(void)
{
if (us_ticker_inited) {
return;
}
us_ticker_inited = 1;
//Common for ticker/timer
uint32_t busClock;
// Structure to initialize PIT
pit_config_t pitConfig;
PIT_GetDefaultConfig(&pitConfig);
PIT_Init(PIT, &pitConfig);
busClock = CLOCK_GetFreq(kCLOCK_BusClk);
//Timer
PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
PIT_StartTimer(PIT, kPIT_Chnl_0);
PIT_StartTimer(PIT, kPIT_Chnl_1);
//Ticker
PIT_SetTimerPeriod(PIT, kPIT_Chnl_2, busClock / 1000000 - 1);
PIT_SetTimerChainMode(PIT, kPIT_Chnl_3, true);
NVIC_SetVector(PIT0_IRQn, (uint32_t)pit_isr);
NVIC_EnableIRQ(PIT0_IRQn);
}
/** Initialize the high frequency ticker
*
*/
void us_ticker_init(void)
{
/* Common for ticker/timer. */
uint32_t busClock;
/* Structure to initialize PIT. */
pit_config_t pitConfig;
PIT_GetDefaultConfig(&pitConfig);
PIT_Init(PIT, &pitConfig);
busClock = CLOCK_GetFreq(kCLOCK_BusClk);
/* Let the timer to count if re-init. */
if (!us_ticker_inited) {
PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
PIT_StartTimer(PIT, kPIT_Chnl_0);
PIT_StartTimer(PIT, kPIT_Chnl_1);
}
/* Configure interrupt generation counters and disable ticker interrupts. */
PIT_StopTimer(PIT, kPIT_Chnl_3);
PIT_StopTimer(PIT, kPIT_Chnl_2);
PIT_SetTimerPeriod(PIT, kPIT_Chnl_2, busClock / 1000000 - 1);
PIT_SetTimerChainMode(PIT, kPIT_Chnl_3, true);
NVIC_SetVector(PIT3_IRQn, (uint32_t) pit_isr);
NVIC_EnableIRQ(PIT3_IRQn);
PIT_DisableInterrupts(PIT, kPIT_Chnl_3, kPIT_TimerInterruptEnable);
us_ticker_inited = true;
}
void us_ticker_init(void)
{
/* Common for ticker/timer. */
uint32_t busClock;
/* Structure to initialize PIT. */
pit_config_t pitConfig;
if (us_ticker_inited) {
/* calling init again should cancel current interrupt */
TPM_DisableInterrupts(TPM2, kTPM_TimeOverflowInterruptEnable);
return;
}
PIT_GetDefaultConfig(&pitConfig);
PIT_Init(PIT, &pitConfig);
busClock = CLOCK_GetFreq(kCLOCK_BusClk);
PIT_SetTimerPeriod(PIT, kPIT_Chnl_0, busClock / 1000000 - 1);
PIT_SetTimerPeriod(PIT, kPIT_Chnl_1, 0xFFFFFFFF);
PIT_SetTimerChainMode(PIT, kPIT_Chnl_1, true);
PIT_StartTimer(PIT, kPIT_Chnl_0);
PIT_StartTimer(PIT, kPIT_Chnl_1);
/* Configure interrupt generation counters and disable ticker interrupts. */
tpm_config_t tpmConfig;
TPM_GetDefaultConfig(&tpmConfig);
/* Set to Div 32 to get 1MHz clock source for TPM */
tpmConfig.prescale = kTPM_Prescale_Divide_32;
TPM_Init(TPM2, &tpmConfig);
NVIC_SetVector(TPM2_IRQn, (uint32_t)tpm_isr);
NVIC_EnableIRQ(TPM2_IRQn);
us_ticker_inited = true;
}
