Using NRF52 Radio IRQhandler for sending and receiving data

[Winz]

Hello there,

I'd like to send and receive data through NRF Radio's handler. I've been able to configure the handler to receive data. Otherwise, I'm having difficulty on sending data.

Here's my current IRQHandler function:

void RADIO_IRQHandler(void) {
	nrf_gpio_pin_set(RECPIN);
	NRF_RADIO->EVENTS_END = 0U;
	NRF_RADIO->TASKS_START = 1U;
	if (NRF_RADIO->EVENTS_READY && (NRF_RADIO->INTENSET & RADIO_INTENSET_READY_Msk)) {
		NRF_RADIO->EVENTS_READY = 0;
	}

	if (NRF_RADIO->EVENTS_END && (NRF_RADIO->INTENSET & RADIO_INTENSET_END_Msk)) {
		NRF_RADIO->EVENTS_END = 0U;
	}

	if (NRF_RADIO->EVENTS_ADDRESS && (NRF_RADIO->INTENSET & RADIO_INTENSET_ADDRESS_Msk)) {
		NRF_RADIO->EVENTS_ADDRESS = 0;
	}
	NRF_RADIO->EVENTS_DISABLED = 0U;

	if (NRF_RADIO->CRCSTATUS == 1U) {
		receive_packet();
		if (targetID == MyID || targetID == ALL_NODES) {
			if (My_Role == MASTER) {
				communicator();
			} else {
				normal();
			}
		}
	}
	nrf_gpio_pin_clear(RECPIN);
}

And here's my send_packet function:

void send_packet()
{
    // send the packet:
    NRF_RADIO->EVENTS_READY = 0U;
    NRF_RADIO->TASKS_TXEN   = 1;

    while (NRF_RADIO->EVENTS_READY == 0U)
    {
        // wait
    }
    NRF_RADIO->EVENTS_END  = 0U;
    NRF_RADIO->TASKS_START = 1U;

    while (NRF_RADIO->EVENTS_END == 0U)
    {
        // wait
    }

    NRF_RADIO->EVENTS_DISABLED = 0U;
    // Disable radio
    NRF_RADIO->TASKS_DISABLE = 1U;

    while (NRF_RADIO->EVENTS_DISABLED == 0U)
    {
        // wait
    }
}

This function may lead my board to freeze somewhere

And:

void send_packet() {
	// send the radioTxBuffer:
	//	if (radioTxBuffer[1] == COLLECT_REPLY) {
	//		//printf("%d: Transmitting: %x %x %x %x\r\n", __LINE__, radioTxBuffer[0], radioTxBuffer[1], radioTxBuffer[2], radioTxBuffer[3]);
	//		copyThis(radioTxBuffer);
	//	}
	NRF_RADIO->EVENTS_DISABLED = 0;
	NRF_RADIO->TASKS_DISABLE = 1;
	while (!NRF_RADIO->EVENTS_DISABLED);		//wait for radio to be disabled

	NRF_RADIO->EVENTS_READY = 0U;
	NRF_RADIO->TASKS_TXEN	 = 1;

	while (NRF_RADIO->EVENTS_READY == 0U) {	//wait for radio to be in tx mode
		// wait
	}

	NRF_RADIO->PACKETPTR = (uint32_t)&radioTxBuffer;

	NRF_RADIO->EVENTS_END	= 0U;			// clear flag
	NRF_RADIO->TASKS_START = 1U;			// Start sending

	while (NRF_RADIO->EVENTS_END == 0U) {	// wait for radio to finish sending
		// wait
	}

	// Clear event
	NRF_RADIO->EVENTS_DISABLED = 0U;
	NRF_RADIO->EVENTS_END = 0;
	NRF_RADIO->EVENTS_READY = 0;
	// Disable radio
	//NRF_RADIO->TASKS_DISABLE = 1U;


	//	while (NRF_RADIO->EVENTS_DISABLED == 0U)
	//	{
	//		// wait
	//	}
}

This function will return normal as nothing happened, while not sending anything.

I would like some enlightenment on how to implement Radio Send and receive properly. (Proprietary radio, not BLE)

Thank you in advance

[craig.goldman]

Try setting PACKETPTR before you set TASKS_TXEN to 1.  Don't forget that once you kick off the hardware, it "runs" faster than the software.

If you would like to see someone else's proprietary protocol implementation on nRF51 and nRF52, my work is open-source and published on GitHub.  Check out "Coriandolo Radio".  Protocol is working and shipping in at least two produces.  In full disclosure, I have not done updates or even been to the site in over a year.

-Craig Goldman

[Winz]

Thank you, Craig. Otherwise, I would opt to go with NRF's way although I will need to re-implement everything. I am worried that something may occur. :)