nrf5x: Add nice!nano board

port/nordic/nrf5x/build.zig

@@ -20,6 +20,9 @@ boards: struct {
         microbit_v1: *const microzig.Target,
         microbit_v2: *const microzig.Target,
     },
+    nicekeyboards: struct {
+        nice_nano: *const microzig.Target,
+    },
 },
 
 pub fn init(dep: *std.Build.Dependency) Self {
@@ -191,6 +194,30 @@ pub fn init(dep: *std.Build.Dependency) Self {
                     },
                 }),
             },
+            .nicekeyboards = .{
+                .nice_nano = chip_nrf52840.derive(.{
+                    .preferred_binary_format = .{ .uf2 = .{ .family_id = .NRF52840 } },
+                    .chip = .{
+                        .name = "nrf52840",
+                        .url = "https://www.nordicsemi.com/products/nrf52840",
+                        .register_definition = .{
+                            .svd = nrfx.path("mdk/nrf52840.svd"),
+                        },
+                        .memory_regions = &.{
+                            .{ .tag = .flash, .offset = 0x00026000, .length = 0x100000 - 0x26000, .access = .rx },
+                            .{ .tag = .ram, .offset = 0x20000008, .length = 0x40000 - 8, .access = .rwx },
+                        },
+                        .patch_files = &.{
+                            b.path("patches/nrf528xx.zon"),
+                        },
+                    },
+                    .board = .{
+                        .name = "nice!nano",
+                        .url = "https://nicekeyboards.com/docs/nice-nano",
+                        .root_source_file = b.path("src/boards/nice_nano.zig"),
+                    },
+                }),
+            },
         },
     };
 }

port/nordic/nrf5x/src/boards/nice_nano.zig

@@ -0,0 +1,12 @@
+const microzig = @import("microzig");
+const nrf = microzig.hal;
+const gpio = nrf.gpio;
+
+pub const led = gpio.num(0, 15);
+pub const uart_tx = gpio.num(0, 9);
+pub const uart_rx = gpio.num(0, 10);
+
+pub fn init() void {
+    led.set_direction(.out);
+    led.put(0);
+}