Add FreeRTOS heap4 intro card

src/tasks/task01_heap_map.c

@@ -0,0 +1,29 @@
+#include "heap4_common.h"
+
+volatile size_t g_header_size;
+volatile size_t g_aligned_header_size;
+volatile size_t g_allocated_bit_set;
+volatile size_t g_user_bytes;
+volatile size_t g_total_block_bytes;
+
+int main(void)
+{
+    HeapBlock block;
+    size_t requested;
+
+    requested = 13U;
+    block.next = 0;
+    block.size = heap4_mark_allocated(heap4_align_up(requested + sizeof(HeapBlock)));
+
+    g_header_size = sizeof(HeapBlock);
+    g_aligned_header_size = heap4_align_up(sizeof(HeapBlock));
+    g_allocated_bit_set = heap4_is_allocated(block.size);
+    g_total_block_bytes = heap4_clear_allocated(block.size);
+    g_user_bytes = g_total_block_bytes - sizeof(HeapBlock);
+
+    TRACE_PRINTF("header=%u aligned=%u allocated=%u total=%u user=%u\n",
+                 (unsigned)g_header_size, (unsigned)g_aligned_header_size,
+                 (unsigned)g_allocated_bit_set, (unsigned)g_total_block_bytes,
+                 (unsigned)g_user_bytes);
+    return 0;
+}