To the kind attention of Nordic support team,
I have got a freertos project and usb is enabled (usb enumeration is done and usb interrupts are correctly working before even starting the scheduler).
In FreeRTOSConfig.h other than having:
#define FREERTOS_USE_RTC 0 and #define FREERTOS_USE_SYSTICK 1
I'd like to add a third custom option:
#define FREERTOS_USE_USB_SOF 2
and change vPortSetupTimerInterrupt initialization (in case FREERTOS_USE_USB_SOF is set), so that usb sof event is triggering rtc1 overflow interrupt
(RTC1_IRQHandler == xPortSysTickHandler).
I was trying to modify like this, but something is missing it seems doesn't work. Could you please give me a hand if is not too much trouble, at least in how should theoretically be? (I'll update
if I have any news):
void vPortSetupTimerInterrupt( void )
{
nrf_drv_clock_lfclk_request(NULL); // assume that usb sof is triggering 0x00FFFFF0, then lfck is needed to do the actual overflow?
nrf_rtc_prescaler_set(portNRF_RTC_REG, portNRF_RTC_PRESCALER);
nrf_rtc_int_enable (portNRF_RTC_REG, RTC_INTENSET_OVRFLW_Msk); // enable overflow interrupt
nrf_rtc_task_trigger (portNRF_RTC_REG, NRF_RTC_TASK_CLEAR); //
// ppi re routing events_sof ---> tasks_trigovrflw
NRF_PPI->CH[0].EEP = (uint32_t)&NRF_USBD->EVENTS_SOF;
NRF_PPI->CH[0].TEP = (uint32_t)&NRF_RTC1->TASKS_TRIGOVRFLW;
NRF_PPI->CHENSET = (1 << 0);
NRF_RTC1->EVTEN = 2;
NRF_RTC1->TASKS_START = 1; // to enable counting
NVIC_SetPriority(portNRF_RTC_IRQn, configKERNEL_INTERRUPT_PRIORITY);
NVIC_EnableIRQ(portNRF_RTC_IRQn);
/*
working code
nrf_drv_clock_lfclk_request(NULL);
nrf_rtc_prescaler_set(portNRF_RTC_REG, portNRF_RTC_PRESCALER);
nrf_rtc_int_enable (portNRF_RTC_REG, RTC_INTENSET_TICK_Msk);
nrf_rtc_task_trigger (portNRF_RTC_REG, NRF_RTC_TASK_CLEAR);
nrf_rtc_task_trigger (portNRF_RTC_REG, NRF_RTC_TASK_START);
nrf_rtc_event_enable(portNRF_RTC_REG, RTC_EVTEN_OVRFLW_Msk);
NVIC_SetPriority(portNRF_RTC_IRQn, configKERNEL_INTERRUPT_PRIORITY);
NVIC_EnableIRQ(portNRF_RTC_IRQn);*/
}
