diff --git a/Cargo.toml b/Cargo.toml
index 33da0ba72ad3e940ed3ee03df21f763774ef6d28..99eb414ab43ce06b304340265e7202012b278555 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,10 +15,9 @@ volatile-register = "0.2.1"
 embedded-hal = "1.0.0-alpha.10"
 
 [dev-dependencies]
-panic-halt = "0.2.0"
+memoffset = "0.9.0"
 
-[dev-dependencies.bl-rom-rt]
-git = "https://gitee.com/rustsbi/bl-rom-rt"
-branch = "main"
-default-features = false
-features = ["bl808-d0"]
+[workspace]
+members = [
+    "examples/*"
+]
diff --git a/examples/jtag-demo/Cargo.toml b/examples/jtag-demo/Cargo.toml
new file mode 100644
index 0000000000000000000000000000000000000000..d9a840d84ab7fa476d31598a631e723392d10a92
--- /dev/null
+++ b/examples/jtag-demo/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "bl-soc-example-jtag-demo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bl-soc = { path = "../.." }
+base-address = "0.0.0"
+panic-halt = "0.2.0"
+embedded-hal = "1.0.0-alpha.10"
+
+[dependencies.bl-rom-rt]
+git = "https://gitee.com/rustsbi/bl-rom-rt"
+branch = "main"
+default-features = false
+features = ["bl808-d0"]
diff --git a/build.rs b/examples/jtag-demo/build.rs
similarity index 100%
rename from build.rs
rename to examples/jtag-demo/build.rs
diff --git a/examples/jtag-bl808-d0.rs b/examples/jtag-demo/src/main.rs
similarity index 89%
rename from examples/jtag-bl808-d0.rs
rename to examples/jtag-demo/src/main.rs
index c70da9d3b6e5e72a6224bd8428c16a20d27b053a..95c2e293b035f30d840376de8275b5965edd9207 100644
--- a/examples/jtag-bl808-d0.rs
+++ b/examples/jtag-demo/src/main.rs
@@ -1,6 +1,6 @@
 // Build this example with:
 // rustup target install riscv64imac-unknown-none-elf
-// cargo build --example jtag-bl808-d0 --target riscv64imac-unknown-none-elf --release
+// cargo build --target riscv64imac-unknown-none-elf --release -p bl-soc-example-jtag-demo
 
 #![no_std]
 #![no_main]
diff --git a/src/glb.rs b/src/glb.rs
index 53708f922eba7ab043015bd863380e28a70eec04..702643614cbf5ea75aba13e3f18b0dbe0cc30a1f 100644
--- a/src/glb.rs
+++ b/src/glb.rs
@@ -335,3 +335,18 @@ pub enum Pull {
     Up = 1,
     Down = 2,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::RegisterBlock;
+    use memoffset::offset_of;
+
+    #[test]
+    fn struct_register_block_offset() {
+        assert_eq!(offset_of!(RegisterBlock, gpio_config), 0x8c4);
+        assert_eq!(offset_of!(RegisterBlock, gpio_input), 0xac4);
+        assert_eq!(offset_of!(RegisterBlock, gpio_output), 0xae4);
+        assert_eq!(offset_of!(RegisterBlock, gpio_set), 0xaec);
+        assert_eq!(offset_of!(RegisterBlock, gpio_clear), 0xaf4);
+    }
+}