Observe shared TWI0 IRQ in nRF radio timing captures

src/helpers/radiolib/NrfRadioIrqObserver.cpp

@@ -6,7 +6,7 @@ extern "C" {
 volatile Counter mesh_hil_irq_counters[SourceCount] = {};
 volatile uint32_t mesh_hil_irq_selected[TaskKindCount + 2] = {};
 volatile Capture mesh_hil_radio_irqs = {
-    0x4d434952, 1, sizeof(Capture), 0, SourceCount, 0, 0, 0, 0, 0, {}};
+    0x4d434952, 2, sizeof(Capture), 0, SourceCount, 0, 0, 0, 0, 0, {}};
 }
 std::atomic<uint32_t> revision{0};
 Work work;
@@ -29,6 +29,7 @@ MESH_OBSERVE_IRQ(UARTE0_UART0_IRQHandler, Uart0)
 MESH_OBSERVE_IRQ(UARTE1_IRQHandler, Uart1)
 MESH_OBSERVE_IRQ(POWER_CLOCK_IRQHandler, PowerClock)
 MESH_OBSERVE_IRQ(USBD_IRQHandler, Usb)
+MESH_OBSERVE_IRQ(SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0_IRQHandler, Twim0Spim0)
 #undef MESH_OBSERVE_IRQ
 
 extern "C" void __real_vTaskSwitchContext(void);

src/helpers/radiolib/NrfRadioIrqObserver.h

@@ -15,7 +15,8 @@
 #include <stdint.h>
 
 namespace mesh { namespace irqobserver {
-enum Source : uint32_t { Rtc1, Gpiote, Uart0, Uart1, PowerClock, Usb, Scheduler, SourceCount };
+// Append sources to retain the original per-source indices in captures.
+enum Source : uint32_t { Rtc1, Gpiote, Uart0, Uart1, PowerClock, Usb, Scheduler, Twim0Spim0, SourceCount };
 enum TaskKind : uint32_t { LoopTask, TimerTask, UsbTask, OtherTask, TaskKindCount };
 struct Counter { uint32_t sequence, calls, cycles; };
 struct Sample {
@@ -186,7 +187,7 @@ inline void finish(uint32_t direction_index, uint32_t result, bool worst) {
   barrier();
   ++capture.sequence;
 }
-static_assert(sizeof(Capture) == 392 && sizeof(Counter) == 12,
+static_assert(sizeof(Capture) == 424 && sizeof(Counter) == 12 && SourceCount == 8,
               "Unexpected IRQ observer ABI");
 } } // namespace mesh::irqobserver
 #endif