rng: Add support for DPPI to RNG

Add use of DPPI to RNG if DPPI is defined.

Signed-off-by: Sletnes Bjørlo, Aurora <[email protected]>

Author: auroraslb

src/HW_models/NRF_RNG.c

@@ -8,7 +8,11 @@
 #include <stdbool.h>
 #include "time_machine_if.h"
 #include "NRF_HW_model_top.h"
+#if defined(PPI_PRESENT)
 #include "NRF_PPI.h"
+#elif defined(DPPI_PRESENT)
+#include "NRF_DPPI.h"
+#endif
 #include "irq_ctrl.h"
 #include "irq_sources.h"
 #include "bs_rand_main.h"
@@ -145,7 +149,17 @@ void nrf_rng_timer_triggered(){
   nrf_hw_find_next_timer_to_trigger();
 
   NRF_RNG_regs.EVENTS_VALRDY = 1;
+
+#if !defined(DPPI_PRESENT)
   nrf_ppi_event(RNG_EVENTS_VALRDY);
+#else
+  if (NRF_RNG_regs.PUBLISH_VALRDY & RNG_PUBLISH_VALRDY_EN_Msk)
+  {
+    uint8_t channel  = NRF_RNG_regs.PUBLISH_VALRDY & RNG_PUBLISH_VALRDY_CHIDX_Msk;
+    nrf_dppi_publish(channel);
+  }
+#endif
+
   if ( RNG_INTEN ){
     hw_irq_ctrl_set_irq(NRF5_IRQ_RNG_IRQn);
     //Note: there is no real need to delay the interrupt a delta

src/nrfx/hal/nrf_rng.c

@@ -8,6 +8,9 @@
 #include "hal/nrf_rng.h"
 #include "bs_tracing.h"
 #include "NRF_RNG.h"
+#if defined(DPPI_PRESENT)
+#include "NRF_DPPI.h"
+#endif
 
 void nrf_rng_task_trigger(NRF_RNG_Type * p_reg, nrf_rng_task_t rng_task)
 {
@@ -35,3 +38,52 @@ void nrf_rng_int_disable(NRF_RNG_Type * p_reg, uint32_t mask)
   NRF_RNG_regs.INTENCLR = mask;
   nrf_rng_regw_sideeffects_INTENCLEAR();
 }
+
+#if defined(DPPI_PRESENT)
+void nrf_rng_subscriber_add(nrf_rng_task_t task, uint8_t channel)
+{
+  switch(task)
+  {
+    case NRF_RNG_TASK_START:
+      nrf_dppi_subscriber_add(channel, nrf_rng_task_start);
+      break;
+    case NRF_RNG_TASK_STOP:
+      nrf_dppi_subscriber_add(channel, nrf_rng_task_stop);
+      break;
+    default:
+      break;
+  }
+}
+
+void nrf_rng_subscriber_remove(nrf_rng_task_t task)
+{
+  switch(task)
+  {
+    case NRF_RNG_TASK_START:
+      nrf_dppi_subscriber_remove(nrf_rng_task_start);
+      break;
+    case NRF_RNG_TASK_STOP:
+      nrf_dppi_subscriber_remove(nrf_rng_task_stop);
+      break;
+    default:
+      break;
+  }
+}
+
+void nrf_rng_subscribe_set(NRF_RNG_Type * p_reg,
+                           nrf_rng_task_t task,
+                           uint8_t        channel)
+{
+  *((volatile uint32_t *) ((uint8_t *) p_reg + (uint32_t) task + 0x80uL)) =
+            ((uint32_t)channel | RNG_SUBSCRIBE_START_EN_Msk);
+  nrf_rng_subscriber_add(task, channel);
+}
+
+
+void nrf_rng_subscribe_clear(NRF_RNG_Type * p_reg,
+                             nrf_rng_task_t task)
+{
+  *((volatile uint32_t *) ((uint8_t *) p_reg + (uint32_t) task + 0x80uL)) = 0;
+  nrf_rng_subscriber_remove(task);
+}
+#endif // defined(DPPI_PRESENT)