diff --git a/Cargo.toml b/Cargo.toml
index fffbd50b5..f693b4a15 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,11 @@ resolver = "2"
 members = [
   "./sils-runtime",
   "./Library/bind-utils",
+
+  "./hal/i2c-noop",
+  "./hal/spi-noop",
+  "./hal/uart-noop",
+  "./hal/wdt-noop",
 ]
 
 [workspace.dependencies]
diff --git a/hal/i2c-noop/Cargo.toml b/hal/i2c-noop/Cargo.toml
new file mode 100644
index 000000000..b4e1e4d85
--- /dev/null
+++ b/hal/i2c-noop/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "c2a-i2c-noop"
+description = "No-op c2a-hal I2C implementation for mock"
+version.workspace = true
+edition = "2021"
+
+[dependencies]
+c2a-core.workspace = true
diff --git a/hal/i2c-noop/src/lib.rs b/hal/i2c-noop/src/lib.rs
new file mode 100644
index 000000000..e3141a584
--- /dev/null
+++ b/hal/i2c-noop/src/lib.rs
@@ -0,0 +1,39 @@
+#![no_std]
+
+use core::ffi::{c_int, c_void};
+
+use c2a_core::hal::i2c::*;
+
+#[no_mangle]
+pub extern "C" fn I2C_init(_i2c_config: *mut I2C_Config) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn I2C_rx(
+    _i2c_config: *mut I2C_Config,
+    _data: *mut c_void,
+    _buffer_size: c_int,
+) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn I2C_tx(
+    _i2c_config: *mut I2C_Config,
+    _data: *mut c_void,
+    _data_size: c_int,
+) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn I2C_reopen(_i2c_config: *mut I2C_Config, _reason: c_int) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn I2C_set_stop_flag(_i2c_config: *mut I2C_Config, _stop_flag: u8) {}
+
+#[no_mangle]
+pub extern "C" fn I2C_set_rx_length(_i2c_config: *mut I2C_Config, _rx_length: u32) {}
diff --git a/hal/spi-noop/Cargo.toml b/hal/spi-noop/Cargo.toml
new file mode 100644
index 000000000..664be7a42
--- /dev/null
+++ b/hal/spi-noop/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "c2a-spi-noop"
+description = "No-op c2a-hal SPI implementation for mock"
+version.workspace = true
+edition = "2021"
+
+[dependencies]
+c2a-core.workspace = true
diff --git a/hal/spi-noop/src/lib.rs b/hal/spi-noop/src/lib.rs
new file mode 100644
index 000000000..8686847fb
--- /dev/null
+++ b/hal/spi-noop/src/lib.rs
@@ -0,0 +1,43 @@
+#![no_std]
+
+use core::ffi::{c_int, c_void};
+
+use c2a_core::hal::spi::*;
+
+#[no_mangle]
+pub extern "C" fn SPI_init(_spi_config: *mut SPI_Config) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn SPI_rx(
+    _spi_config: *mut SPI_Config,
+    _data: *mut c_void,
+    _buffer_size: c_int,
+) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn SPI_tx(
+    _spi_config: *mut SPI_Config,
+    _data: *mut c_void,
+    _data_size: c_int,
+) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn SPI_reopen(_spi_config: *mut SPI_Config, _reason: c_int) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn SPI_set_rx_length(_spi_config: *mut SPI_Config, _rx_length: u16) {}
+
+#[no_mangle]
+pub extern "C" fn SPI_set_cs_state_after_tx(
+    _spi_config: *mut SPI_Config,
+    _cs_state_after_tx: SPI_CS_STATE_AFTER_TX,
+) {
+}
diff --git a/hal/uart-noop/Cargo.toml b/hal/uart-noop/Cargo.toml
new file mode 100644
index 000000000..3bbe07a4d
--- /dev/null
+++ b/hal/uart-noop/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "c2a-uart-noop"
+description = "No-op c2a-hal UART implementation for mock"
+version.workspace = true
+edition = "2021"
+
+[dependencies]
+c2a-core.workspace = true
diff --git a/hal/uart-noop/src/lib.rs b/hal/uart-noop/src/lib.rs
new file mode 100644
index 000000000..a5933bcd2
--- /dev/null
+++ b/hal/uart-noop/src/lib.rs
@@ -0,0 +1,33 @@
+#![no_std]
+
+use core::ffi::{c_int, c_void};
+
+use c2a_core::hal::uart::*;
+
+#[no_mangle]
+pub extern "C" fn UART_init(_uart_config: *mut UART_Config) -> c_int {
+    UART_ERR_CODE_UART_OK.0
+}
+
+#[no_mangle]
+pub extern "C" fn UART_rx(
+    _uart_config: *mut UART_Config,
+    _data: *mut c_void,
+    _buffer_size: c_int,
+) -> c_int {
+    UART_ERR_CODE_UART_OK.0
+}
+
+#[no_mangle]
+pub extern "C" fn UART_tx(
+    _uart_config: *mut UART_Config,
+    _data: *mut c_void,
+    _data_size: c_int,
+) -> c_int {
+    UART_ERR_CODE_UART_OK.0
+}
+
+#[no_mangle]
+pub extern "C" fn UART_reopen(_uart_config: *mut UART_Config, _reason: c_int) -> c_int {
+    UART_ERR_CODE_UART_OK.0
+}
diff --git a/hal/wdt-noop/Cargo.toml b/hal/wdt-noop/Cargo.toml
new file mode 100644
index 000000000..0cb074196
--- /dev/null
+++ b/hal/wdt-noop/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "c2a-wdt-noop"
+description = "No-op c2a-hal WDT implementation for mock"
+version.workspace = true
+edition = "2021"
+
+[dependencies]
+c2a-core.workspace = true
diff --git a/hal/wdt-noop/src/lib.rs b/hal/wdt-noop/src/lib.rs
new file mode 100644
index 000000000..e35bf42b1
--- /dev/null
+++ b/hal/wdt-noop/src/lib.rs
@@ -0,0 +1,42 @@
+#![no_std]
+#![allow(clippy::missing_safety_doc)]
+
+use core::ffi::c_int;
+
+use c2a_core::hal::wdt::*;
+
+#[no_mangle]
+pub unsafe extern "C" fn WDT_initialize(config: *mut WDT_Config) -> c_int {
+    let cfg = unsafe { &mut (*config) };
+
+    WDT_set_timer(config, 7);
+
+    cfg.is_clear_enable = 1;
+    cfg.is_wdt_enable = 1;
+
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn WDT_clear(_wdt_config: *mut WDT_Config) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn WDT_enable(_wdt_config: *mut WDT_Config) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub extern "C" fn WDT_disable(_wdt_config: *mut WDT_Config) -> c_int {
+    0
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn WDT_set_timer(config: *mut WDT_Config, time: c_int) -> c_int {
+    let cfg = unsafe { &mut (*config) };
+
+    cfg.timer_setting = time;
+
+    0
+}