nRF54LM20 EGU00 Peripheral not present in Zephyr

Question

Board: nRF54LM20A DK 
 NCS: v3.3.1 
 
 I was trying to work with the EGU00 peripheral on the nRF54LM20A, and I realized that it is not present in the device tree definition files from the nRF54LM20_A_B. 
 Does the EGU00 peripheral actually exist? It is present in the micro's datasheet and documentation: 
 
 https://docs.nordicsemi.com/r/bundle/ps_nrf54lm20a/page/egu.html-topic

khelmutlord · Answer

It is possible to use the EGU directly through nrfx.

  #include <zephyr/kernel.h>
  #include <zephyr/irq.h>
  #include <nrfx_egu.h>

  static nrfx_egu_t egu00 = NRFX_EGU_INSTANCE(NRF_EGU00);

  static void egu00_event_handler(uint8_t event_idx, void *context)
  {
  	ARG_UNUSED(context);

  	/* event_idx is 0..5 on EGU00 */
  }

  void egu00_init(void)
  {
  	int err;

  	IRQ_CONNECT(EGU00_IRQn,
  		   NRF_DEFAULT_IRQ_PRIORITY,
  		   nrfx_egu_irq_handler,
  		   &egu00,
  		   0);

  	err = nrfx_egu_init(&egu00,
  			   NRF_DEFAULT_IRQ_PRIORITY,
  			   egu00_event_handler,
  			   NULL);
  	__ASSERT_NO_MSG(err == 0);

  	nrfx_egu_int_enable(&egu00, NRF_EGU_INT_TRIGGERED0);
  }

  void egu00_trigger(void)
  {
  	nrfx_egu_trigger(&egu00, 0);
  }

Something like this should work. Set CONFIG_NRFX_EGU10=y in your prj.conf. While this seems to select EGU10, it will still permit you to use EGU00.

Thanks,

Helmut Lord