Add rp2040.cpuid() call to get running core (earlephilhower#1190)

earlephilhower · web-flow · commit 974301eaaf3c · 2023-02-14T16:22:04.000-08:00
Per question received via email.
diff --git a/cores/rp2040/RP2040Support.h b/cores/rp2040/RP2040Support.h
@@ -246,6 +246,11 @@ class RP2040 {
         return clock_get_hz(clk_sys);
     }
 
+    // Get current CPU core number
+    static int cpuid() {
+        return sio_hw->cpuid;
+    }
+
     // Get CPU cycle count.  Needs to do magic to extens 24b HW to something longer
     volatile uint64_t _epoch = 0;
     inline uint32_t getCycleCount() {
diff --git a/docs/rp2040.rst b/docs/rp2040.rst
@@ -13,6 +13,10 @@ Returns the current frequency of the core clock.  This is read at runtime,
 versus the constant ``F_CPU`` macro that is also available.  This is useful
 in cases where your code changes the core clock (i.e. low power modes, etc.)
 
+int rp2040.cpuid()
+~~~~~~~~~~~~~~~~~~
+Returns the current core ID (0 or 1) of the executing task.
+
 uint32_t rp2040.getCycleCount()
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Returns a 32-bit cycle count from then the core started running.  Because it
