begin adding rx from radio handling

src/MemoryPool.h

@@ -0,0 +1,47 @@
+#pragma once 
+
+#include <Arduino.h>
+#include <assert.h>
+
+
+/**
+ * A pool based allocator
+ * 
+ * Eventually this routine will even be safe for ISR use...
+ */
+template <class T> class MemoryPool {
+    TypedQueue<T *> dead;
+
+    T *buf; // our large raw block of memory
+
+public:
+    MemoryPool(int maxElements): queued(maxElements), dead(maxElements) {
+        buf = new T[maxElements];
+        
+        // prefill dead
+        for(int i = 0; i < maxElements; i++)
+            release(&buf[i]);
+    }
+
+    ~MemoryPool() {
+        delete[] buf;
+    }
+
+    /// Return a queable object which has been prefilled with zeros
+    T *allocZeroed(TickType_t maxWait = portMAX_DELAY) {
+        T *p;
+
+        if(dead.dequeue(&p, maxWait) != pdTRUE)
+            return NULL;
+
+        memset(p, 0, sizeof(T));
+        return p;
+    }
+
+    /// Return a buffer for use by others
+    void free(T *p) {
+        int res = dead.enqueue(p, 0);
+        assert(res == pdTRUE);
+    }
+};
+