radio event end point addresses nrf52832

Question

Hi, 
 Does anyone know the event end point addresses for the following on the nrf52832:
RADIO_EVENTS->ADDRESS
RADIO_EVENTS->READY
RADIO_EVENTS->END 
 The addresses for these do not appear to be listed in the documentation as they are used in the pre-programmed channels. I would like to use these events to trigger GPIOTE tasks for debugging purposes.

Vidar Berg · Accepted Answer

Hi, you can use the PPI fork registers to trigger a new GPIOTE task. For this you only need to know the PPI chanel number assigned to the events you mentioned above. That is, PPI.FORK[24].TEP, PPI.FORK[25].TEP, and PPI.FORK[27].TEP respectively.

The register addresses are listed in the RADIO peripheral chapter here.

EDIT 2/19 added code example

The PPI module supports forking of the event point into two separate task endpoints, even for the pre-programmed channels. Forking doesn't affect the existing channel configuration.

Below code snippet toggles LED_4 upon the RADIO->EVENTS_ADDRESS event.

static void gpiote_task_init(void)
{

NRF_GPIOTE->CONFIG[0] =((GPIOTE_CONFIG_MODE_Task       << GPIOTE_CONFIG_MODE_Pos)
                       |(LED_4                         << GPIOTE_CONFIG_PSEL_Pos)
                       |(GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos)
                       |(GPIOTE_CONFIG_OUTINIT_Low     << GPIOTE_CONFIG_OUTINIT_Pos));


NRF_PPI->CHENSET      = PPI_CHEN_CH26_Msk;
//Fork the GPIOTE TASK with TIMER0->TASKS_CAPTURE[1] (see table 2 - Pre-programmed channels)
NRF_PPI->FORK[26].TEP = (uint32_t)&NRF_GPIOTE->TASKS_OUT[0];
}

radio event end point addresses nrf52832

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