diff --git a/.drone.yml b/.drone.yml
index 94e5a4b..55f050c 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -14,4 +14,4 @@ steps:
     commands:
       - mkdir build && cd build
       - cmake -DCMAKE_TOOLCHAIN_FILE=arm-none-eabi.cmake ..
-      - make
+      - make at32f437_mpyate_host_FLASH.elf
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ffd58ba..68425e7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.10)
 
-project(at32f437_start_template)
+project(at32f437_mpyate_host)
 
 enable_language(CXX)
 enable_language(ASM)
@@ -40,8 +40,10 @@ set(TARGET_SOURCES
     "SDK/libraries/drivers/src/at32f435_437_wdt.c"
     "SDK/libraries/drivers/src/at32f435_437_wwdt.c"
     "SDK/libraries/drivers/src/at32f435_437_xmc.c"
+    "SDK/middlewares/i2c_application_library/i2c_application.c"
     "board/at32f435_437_board.c"
     "board/at32f435_437_clock.c"
+    "src/app_ate_impl.c"
     "src/main.c"
 )
 
@@ -54,12 +56,14 @@ set(TARGET_C_INCLUDES
     "SDK/libraries/cmsis/cm4/core_support"
     "SDK/libraries/cmsis/cm4/device_support"
     "SDK/libraries/drivers/inc"
+    "SDK/middlewares/i2c_application_library"
     "board"
     "include"
 )
 
 # Shared libraries linked with application
 set(TARGET_LIBS
+    "mpyate_host"
     "c"
     "m"
     "nosys"
@@ -87,6 +91,8 @@ set(CMAKE_CXX_FLAGS        "${CMAKE_CXX_FLAGS} -Wall -fno-common -fno-builtin -f
 set(CMAKE_ASM_FLAGS        "${CMAKE_C_FLAGS} -x assembler-with-cpp")
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gc-sections")
 
+add_subdirectory(lib/mpyate)
+
 # Shared sources, includes and definitions
 add_compile_definitions(${TARGET_C_DEFINES})
 include_directories(${TARGET_C_INCLUDES})
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9e7734f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# MPyATE Host
+
+[![Build Status](https://ci.minori.work/api/badges/imi415/Artery_AT32F437_Start_MPyATE_Host/status.svg)](https://ci.minori.work/imi415/Artery_AT32F437_Start_MPyATE_Host)
\ No newline at end of file
diff --git a/include/app_ate_impl.h b/include/app_ate_impl.h
new file mode 100644
index 0000000..162b893
--- /dev/null
+++ b/include/app_ate_impl.h
@@ -0,0 +1,10 @@
+#ifndef APP_ATE_IMPL_H
+#define APP_ATE_IMPL_H
+
+#include "mpyate_host.h"
+
+void      ate_impl_i2c_init(void);
+ate_ret_t ate_impl_i2c_read(void *handle, uint8_t *data, uint8_t len);
+ate_ret_t ate_impl_i2c_write(void *handle, uint8_t *data, uint8_t len);
+
+#endif  // APP_ATE_IMPL_H
diff --git a/lib/mpyate/CMakeLists.txt b/lib/mpyate/CMakeLists.txt
new file mode 100644
index 0000000..b71aa3a
--- /dev/null
+++ b/lib/mpyate/CMakeLists.txt
@@ -0,0 +1,14 @@
+cmake_minimum_required(VERSION 3.10)
+
+project(mpyate_host)
+
+set(ATE_HOST_SRCS
+    "src/mpyate_host.c"
+)
+
+set(ATE_HOST_INCLUDES
+    "include"
+)
+
+add_library(${PROJECT_NAME} ${ATE_HOST_SRCS})
+target_include_directories(${PROJECT_NAME} PUBLIC ${ATE_HOST_INCLUDES})
diff --git a/lib/mpyate/include/mpyate_host.h b/lib/mpyate/include/mpyate_host.h
new file mode 100644
index 0000000..e52893f
--- /dev/null
+++ b/lib/mpyate/include/mpyate_host.h
@@ -0,0 +1,27 @@
+#ifndef MPYATE_HOST_H
+#define MPYATE_HOST_H
+
+#include <stdint.h>
+
+typedef enum {
+    ATE_RET_SUCCESS,
+    ATE_RET_FAIL,
+} ate_ret_t;
+
+typedef ate_ret_t (*ate_i2c_read_t)(void *handle, uint8_t *data, uint8_t len);
+typedef ate_ret_t (*ate_i2c_write_t)(void *handle, uint8_t *data, uint8_t len);
+
+typedef struct {
+    ate_i2c_read_t  read;
+    ate_i2c_write_t write;
+} ate_ops_t;
+
+typedef struct {
+    ate_ops_t ops;
+
+    void *user_data;
+} ate_t;
+
+ate_ret_t ate_init(ate_t *ate);
+
+#endif  // MPYATE_HOST_H
diff --git a/lib/mpyate/include/private/mpyate_regs.h b/lib/mpyate/include/private/mpyate_regs.h
new file mode 100644
index 0000000..d02f635
--- /dev/null
+++ b/lib/mpyate/include/private/mpyate_regs.h
@@ -0,0 +1,11 @@
+#ifndef MPYATE_COMMANDS_H
+#define MPYATE_COMMANDS_H
+
+#define ATE_REG_CTRL 0x00U
+#define ATE_REG_VER  0xFEU
+#define ATE_REG_ID   0xFFU
+
+#define ATE_REG_CTRL_RST_Pos 15
+#define ATe_REG_CTRL_RST_Msk (1U << ATE_REG_CTRL_RST_Pos)
+
+#endif  // MPYATE_COMMANDS_H
diff --git a/lib/mpyate/src/mpyate_host.c b/lib/mpyate/src/mpyate_host.c
new file mode 100644
index 0000000..1d1af5d
--- /dev/null
+++ b/lib/mpyate/src/mpyate_host.c
@@ -0,0 +1,68 @@
+#include "mpyate_host.h"
+
+#include "private/mpyate_regs.h"
+
+#define ATE_COMPONENT_ID 0xEACE
+
+static ate_ret_t ate_read_id(ate_t *ate, uint16_t *id);
+
+static ate_ret_t ate_read_register(ate_t *ate, uint8_t reg, uint16_t *data);
+static ate_ret_t ate_write_register(ate_t *ate, uint8_t reg, uint16_t data);
+
+ate_ret_t ate_init(ate_t *ate) {
+    ate_ret_t ret = ATE_RET_SUCCESS;
+
+    uint16_t id;
+
+    ret = ate_read_id(ate, &id);
+    if (ret != ATE_RET_SUCCESS) {
+        return ret;
+    }
+
+    if (id != ATE_COMPONENT_ID) {
+        ret = ATE_RET_FAIL;
+    }
+
+    return ret;
+}
+
+static ate_ret_t ate_read_id(ate_t *ate, uint16_t *id) {
+    return ate_read_register(ate, ATE_REG_ID, id);
+}
+
+static ate_ret_t ate_read_register(ate_t *ate, uint8_t reg, uint16_t *data) {
+    ate_ret_t ret = ATE_RET_SUCCESS;
+
+    uint8_t tx_data[2] = {reg, 0x00};
+    uint8_t rx_data[2] = {0x00, 0x00};
+
+    ret = ate->ops.write(ate->user_data, tx_data, 0x01);
+    if (ret != ATE_RET_SUCCESS) {
+        return ret;
+    }
+
+    ret = ate->ops.read(ate->user_data, rx_data, 2);
+    if (ret != ATE_RET_SUCCESS) {
+        return ret;
+    }
+
+    *data = rx_data[1] << 8U | rx_data[0];
+
+    return ret;
+}
+
+static ate_ret_t ate_write_register(ate_t *ate, uint8_t reg, uint16_t data) {
+    ate_ret_t ret = ATE_RET_SUCCESS;
+
+    uint8_t tx_data[3] = {reg, 0x00, 0x00};
+
+    tx_data[1] = data & 0xFFU;
+    tx_data[2] = (data >> 8U) & 0xFFU;
+
+    ret = ate->ops.write(ate->user_data, tx_data, 0x03);
+    if (ret != ATE_RET_SUCCESS) {
+        return ret;
+    }
+
+    return ret;
+}
\ No newline at end of file
diff --git a/src/app_ate_impl.c b/src/app_ate_impl.c
new file mode 100644
index 0000000..b67b623
--- /dev/null
+++ b/src/app_ate_impl.c
@@ -0,0 +1,62 @@
+/* SDK drivers */
+#include "at32f435_437_board.h"
+#include "at32f435_437_clock.h"
+#include "at32f435_437_i2c.h"
+
+/* Middleware */
+#include "i2c_application.h"
+
+/* ATE */
+#include "app_ate_impl.h"
+
+#define APP_ATE_I2C_ADDR   (0x28U)
+#define APP_ATE_I2C_ADDR_W (APP_ATE_I2C_ADDR << 1U)
+#define APP_ATE_I2C_ADDR_R ((APP_ATE_I2C_ADDR << 1U) | 0x01U)
+
+static i2c_handle_type s_i2c_handle = {
+    .i2cx = I2C1,
+};
+
+void ate_impl_i2c_init(void) {
+    i2c_config(&s_i2c_handle);
+}
+
+ate_ret_t ate_impl_i2c_read(void *handle, uint8_t *data, uint8_t len) {
+    if (i2c_master_receive(&s_i2c_handle, APP_ATE_I2C_ADDR_R, data, len, 0xFFFFFFFF) != I2C_OK) {
+        return ATE_RET_FAIL;
+    }
+    return ATE_RET_SUCCESS;
+}
+
+ate_ret_t ate_impl_i2c_write(void *handle, uint8_t *data, uint8_t len) {
+    if (i2c_master_transmit(&s_i2c_handle, APP_ATE_I2C_ADDR_W, data, len, 0xFFFFFFFF) != I2C_OK) {
+        return ATE_RET_FAIL;
+    }
+    return ATE_RET_SUCCESS;
+}
+
+void i2c_lowlevel_init(i2c_handle_type *handle) {
+    if (handle->i2cx == I2C1) {
+        crm_periph_clock_enable(CRM_I2C1_PERIPH_CLOCK, TRUE);
+        crm_periph_clock_enable(CRM_GPIOB_PERIPH_CLOCK, TRUE);
+
+        /* I2C1: PB8/PB9 */
+        gpio_pin_mux_config(GPIOB, GPIO_PINS_SOURCE8, GPIO_MUX_4);
+        gpio_pin_mux_config(GPIOB, GPIO_PINS_SOURCE9, GPIO_MUX_4);
+
+        gpio_init_type pin_cfg = {
+            .gpio_pins           = GPIO_PINS_8 | GPIO_PINS_9,
+            .gpio_mode           = GPIO_MODE_MUX,
+            .gpio_out_type       = GPIO_OUTPUT_OPEN_DRAIN,
+            .gpio_pull           = GPIO_PULL_NONE,
+            .gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER,
+        };
+
+        gpio_init(GPIOB, &pin_cfg);
+
+        /* Magic number: timing register value */
+        i2c_init(I2C1, 0x0F, 0x80504C4E);
+
+        i2c_own_address1_set(I2C1, I2C_ADDRESS_MODE_7BIT, 0xA0);
+    }
+}
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 06041ff..00523ad 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,9 +1,37 @@
+#include <stdio.h>
+
+/* SDK drivers */
 #include "at32f435_437_board.h"
 #include "at32f435_437_clock.h"
+#include "at32f435_437_i2c.h"
+
+/* ATE */
+#include "app_ate_impl.h"
+
+static ate_t s_ate = {
+    .ops =
+        {
+            .read  = ate_impl_i2c_read,
+            .write = ate_impl_i2c_write,
+        },
+};
 
 int main(void) {
     system_clock_config();
     at32_board_init();
+    uart_print_init(115200);
+
+    ate_impl_i2c_init();
+
+    if (ate_init(&s_ate) != ATE_RET_SUCCESS) {
+        printf("Failed to initialize ATE.\r\n");
+
+        goto dead_loop;
+    }
+
+    printf("ATE initialized.\r\n");
+
+dead_loop:
 
     for (;;) {
         /* -- */