add umm allocator (#148)

build.zig

@@ -538,6 +538,9 @@ pub fn addFirmware(
         },
     });
 
+    const umm = mz.dependency("umm-zig", .{}).module("umm");
+    fw.modules.microzig.dependencies.put("umm", umm) catch @panic("out of memory");
+
     fw.artifact.addModule("app", fw.modules.app);
     fw.artifact.addModule("microzig", fw.modules.microzig);
 

build.zig.zon

@@ -10,5 +10,9 @@
             .url = "https://github.com/ZigEmbeddedGroup/regz/archive/b0ded63fc284da0ed9f4776eb7d1c4ad7175622d.tar.gz",
             .hash = "1220e9299f949d3566a1dc4dd62caf82a06bb6c8ad5a693e62117b0941da9dc55ea2",
         },
+        .@"umm-zig" = .{
+            .url = "https://github.com/ZigEmbeddedGroup/umm-zig/archive/99d815adfbc5cc4ad385dd765a6192f85e54179f.tar.gz",
+            .hash = "12207ef7375ea45e97f4fba9c5dfa74d022902893c4dbf1a0076726b7ec39a02ea3f",
+        },
     },
 }

src/core.zig

@@ -1,7 +1,9 @@
 pub const experimental = @import("core/experimental.zig");
+pub const heap = @import("core/heap.zig");
 /// USB data types and helper functions
 pub const usb = @import("core/usb.zig");
 
 test "core tests" {
     _ = usb;
+    _ = heap;
 }

src/core/heap.zig

@@ -0,0 +1,5 @@
+pub const UmmAllocator = @import("umm").UmmAllocator;
+
+test "heap tests" {
+    _ = UmmAllocator;
+}