About the use of gpiote and dppi of nrf5340

RE: About the use of gpiote and dppi of nrf5340

mingjkl — Thu, 25 Aug 2022 02:22:29 GMT

Thank you very much for your technical support and reminders.

RE: About the use of gpiote and dppi of nrf5340

Håkon Alseth — Tue, 23 Aug 2022 12:50:12 GMT

Hi,

ESB does not have PA/LNA support, but the code that you're using here, with selective_auto_ack=true, runs at my end:

Channel 0 is a debug signal, cleared after TX_FAILED event in the esb handler, while channel 1 is your dppi/gpiote routine.

Please note that your chosen PA/LNA will have timing requirements to when the PA should be turned off, and the event coming from the radio will turn off the pin immediately after the last bit has been transferred on-air. This can be problematic for some PA's, and if this is the case for your PA; I would recommend that you use a timer to postpone de-asserting the pin.

Kind regards,

Håkon

RE: About the use of gpiote and dppi of nrf5340

mingjkl — Tue, 23 Aug 2022 10:33:07 GMT

After I set selective_auto_ack = true in the esb_config structure, PUBLISH_TXREADY and PUBLISH_RXREADY are not triggered, why is this?

RE: About the use of gpiote and dppi of nrf5340

mingjkl — Tue, 23 Aug 2022 06:34:16 GMT

I changed the implementation method below, it seems that the function I want has been successfully implemented, please help me confirm.

#define PA_SWITCH_CTX_PIN NRF_GPIO_PIN_MAP(1,9)

void esb_pa_ppi_init(void)
{


	uint8_t tx_ppi_chaannel;
	uint8_t rx_ppi_chaannel;

	NRF_GPIOTE->CONFIG[0] = GPIOTE_CONFIG_MODE_Task << GPIOTE_CONFIG_MODE_Pos |
					GPIOTE_CONFIG_OUTINIT_High << GPIOTE_CONFIG_OUTINIT_Pos |
					PA_SWITCH_CTX_PIN << GPIOTE_CONFIG_PSEL_Pos;

	nrfx_dppi_channel_alloc(&tx_ppi_chaannel);
	printk("tx ppi ch %d\r\n", tx_ppi_chaannel);
	NRF_GPIOTE->SUBSCRIBE_CLR[0] = DPPIC_SUBSCRIBE_CHG_EN_EN_Msk | tx_ppi_chaannel;
	NRF_RADIO->PUBLISH_RXREADY = DPPIC_SUBSCRIBE_CHG_EN_EN_Msk | tx_ppi_chaannel;
	nrfx_dppi_channel_enable(tx_ppi_chaannel);

	nrfx_dppi_channel_alloc(&rx_ppi_chaannel);
	printk("rx ppi ch %d\r\n", rx_ppi_chaannel);
	NRF_GPIOTE->SUBSCRIBE_SET[0] = DPPIC_SUBSCRIBE_CHG_EN_EN_Msk | rx_ppi_chaannel;
	NRF_RADIO->PUBLISH_TXREADY = DPPIC_SUBSCRIBE_CHG_EN_EN_Msk | rx_ppi_chaannel;

	nrfx_dppi_channel_enable(rx_ppi_chaannel);


}