diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..3003f59
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,11 @@
+BasedOnStyle: Google
+IndentWidth: 4
+AlignConsecutiveMacros: AcrossEmptyLines
+AlignConsecutiveDeclarations: true
+AlignConsecutiveAssignments: AcrossEmptyLinesAndComments
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterEnum: false
+  AfterStruct: false
+  SplitEmptyFunction: false
+ColumnLimit: 120
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..cc7960a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+/Makefile
+/cmake-build-*
+/lib/mruby/build_config.rb.lock
+/lib/mruby/build
+/.mxproject
+/.vscode
\ No newline at end of file
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..9c3415b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lib/epd-spi"]
+	path = lib/epd-spi
+	url = https://github.com/imi415/epd-spi.git
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 74f6a18..bb84aa9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -113,7 +113,7 @@ set(TARGET_C_INCLUDES
 
 # Shared libraries linked with application
 set(TARGET_LIBS
-    "ewl1501aa"
+    "epd-spi"
 )
 
 # Shared library and linker script search paths
@@ -142,7 +142,7 @@ set(CMAKE_ASM_FLAGS        "${CMAKE_ASM_FLAGS} ${TARGET_CMAKE_C_FLAGS} -x assemb
 set(CMAKE_EXE_LINKER_FLAGS "-specs=nano.specs -Wl,--gc-sections -lc -lm -lnosys ${TARGET_LDFLAGS_EXTRA}")
 
 # Include sub directories here
-add_subdirectory(lib/ewl1501aa)
+add_subdirectory(lib/epd-spi)
 
 # Shared sources, includes and definitions
 add_compile_definitions(${TARGET_C_DEFINES})
diff --git a/Core/Inc/main.h b/Core/Inc/main.h
index ac686b6..0f9848f 100644
--- a/Core/Inc/main.h
+++ b/Core/Inc/main.h
@@ -59,6 +59,8 @@ void Error_Handler(void);
 /* Private defines -----------------------------------------------------------*/
 #define SDMMC1_DET_Pin GPIO_PIN_13
 #define SDMMC1_DET_GPIO_Port GPIOC
+#define LED_Pin GPIO_PIN_1
+#define LED_GPIO_Port GPIOA
 #define OLED_DC_Pin GPIO_PIN_6
 #define OLED_DC_GPIO_Port GPIOA
 #define OLED_RST_Pin GPIO_PIN_4
diff --git a/Core/Src/main.c b/Core/Src/main.c
index 573cf83..f9627be 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -26,7 +26,7 @@
 
 #include <stdio.h>
 #include <string.h>
-#include "ewl1501aa.h"
+#include "oled_panel_elw1501aa.h"
 
 /* USER CODE END Includes */
 
@@ -375,6 +375,9 @@ static void MX_GPIO_Init(void)
   __HAL_RCC_GPIOA_CLK_ENABLE();
   __HAL_RCC_GPIOD_CLK_ENABLE();
 
+  /*Configure GPIO pin Output Level */
+  HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
+
   /*Configure GPIO pin Output Level */
   HAL_GPIO_WritePin(OLED_DC_GPIO_Port, OLED_DC_Pin, GPIO_PIN_SET);
 
@@ -387,12 +390,12 @@ static void MX_GPIO_Init(void)
   GPIO_InitStruct.Pull = GPIO_NOPULL;
   HAL_GPIO_Init(SDMMC1_DET_GPIO_Port, &GPIO_InitStruct);
 
-  /*Configure GPIO pin : OLED_DC_Pin */
-  GPIO_InitStruct.Pin = OLED_DC_Pin;
+  /*Configure GPIO pins : LED_Pin OLED_DC_Pin */
+  GPIO_InitStruct.Pin = LED_Pin|OLED_DC_Pin;
   GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
   GPIO_InitStruct.Pull = GPIO_NOPULL;
   GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
-  HAL_GPIO_Init(OLED_DC_GPIO_Port, &GPIO_InitStruct);
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
   /*Configure GPIO pin : OLED_RST_Pin */
   GPIO_InitStruct.Pin = OLED_RST_Pin;
@@ -405,14 +408,14 @@ static void MX_GPIO_Init(void)
 
 /* USER CODE BEGIN 4 */
 int ewl_impl_init(void);
-ewl1501aa_ret_t ewl_impl_reset_cb(void *handle);
-ewl1501aa_ret_t ewl_impl_write_cmd_cb(void *handle, uint8_t *cmd, uint8_t len);
-ewl1501aa_ret_t ewl_impl_write_data_cb(void *handle, uint8_t *data, uint16_t len);
+epd_ret_t ewl_impl_reset_cb(void *handle);
+epd_ret_t ewl_impl_write_cmd_cb(void *handle, uint8_t *cmd, uint32_t len);
+epd_ret_t ewl_impl_write_data_cb(void *handle, uint8_t *data, uint32_t len);
 
-static ewl1501aa_t s_oled = {
+static oled_ewl1501aa_t s_oled = {
   .cb = {
     .reset_cb = ewl_impl_reset_cb,
-    .write_cmd_cb = ewl_impl_write_cmd_cb,
+    .write_command_cb = ewl_impl_write_cmd_cb,
     .write_data_cb = ewl_impl_write_data_cb,
   },
   .user_data = NULL,
@@ -433,8 +436,20 @@ void StartDefaultTask(void *argument)
 {
   /* USER CODE BEGIN 5 */
   ewl_impl_init();
-  ewl1501aa_init(&s_oled);
-  ewl1501aa_power(&s_oled, 1);
+  oled_ewl1501aa_init(&s_oled);
+  oled_ewl1501aa_power(&s_oled, 1);
+
+  memset(s_frame, 0xAA, 8192);
+  epd_coord_t coord = {
+    .x_start = 0,
+    .x_end = 63,
+    .y_start = 0,
+    .y_end = 127,
+  };
+
+  oled_ewl1501aa_upload(&s_oled, &coord, s_frame);
+
+  osDelay(1000);
 
   if(f_mount(&SDFatFS, SDPath, 1) != FR_OK) {
     printf("FS mount failed.\r\n");
@@ -453,7 +468,8 @@ void StartDefaultTask(void *argument)
     if(f_read(&apple_fd, s_frame, 8192, &br) != FR_OK) {
       printf("Read failed.\r\n");
     }
-    ewl1501aa_upload(&s_oled, s_frame);
+    oled_ewl1501aa_upload(&s_oled, NULL, s_frame);
+    HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
     uint32_t frame_end = osKernelGetTickCount();
     if(frame_end - frame_start < 33) {
       osDelay(33 - (frame_end - frame_start));
@@ -462,7 +478,7 @@ void StartDefaultTask(void *argument)
 
 dead_loop:
   osDelay(5000);
-  ewl1501aa_power(&s_oled, 0);
+  oled_ewl1501aa_power(&s_oled, 0);
 
   /* Infinite loop */
   for(;;)
diff --git a/Core/Src/oled_impl.c b/Core/Src/oled_impl.c
index 7b87b2e..f10234e 100644
--- a/Core/Src/oled_impl.c
+++ b/Core/Src/oled_impl.c
@@ -1,5 +1,5 @@
 #include "cmsis_os.h"
-#include "ewl1501aa.h"
+#include "oled_panel_elw1501aa.h"
 #include "main.h"
 #include "stm32h7xx_hal.h"
 
@@ -13,7 +13,7 @@ int ewl_impl_init(void) {
     return 0;
 }
 
-ewl1501aa_ret_t ewl_impl_reset_cb(void *handle) {
+epd_ret_t ewl_impl_reset_cb(void *handle) {
     HAL_GPIO_WritePin(OLED_RST_GPIO_Port, OLED_RST_Pin, GPIO_PIN_SET);
     osDelay(10);
     HAL_GPIO_WritePin(OLED_RST_GPIO_Port, OLED_RST_Pin, GPIO_PIN_RESET);
@@ -21,31 +21,31 @@ ewl1501aa_ret_t ewl_impl_reset_cb(void *handle) {
     HAL_GPIO_WritePin(OLED_RST_GPIO_Port, OLED_RST_Pin, GPIO_PIN_SET);
     osDelay(10);
 
-    return EWL1501AA_OK;
+    return EPD_OK;
 }
 
-ewl1501aa_ret_t ewl_impl_write_cmd_cb(void *handle, uint8_t *cmd, uint8_t len) {
+epd_ret_t ewl_impl_write_cmd_cb(void *handle, uint8_t *cmd, uint32_t len) {
     HAL_GPIO_WritePin(OLED_DC_GPIO_Port, OLED_DC_Pin, GPIO_PIN_RESET);
     HAL_StatusTypeDef ret = HAL_SPI_Transmit_DMA(&hspi1, cmd, len);
     if(ret != HAL_OK) {
-        return EWL1501AA_FAIL;
+        return EPD_FAIL;
     }
 
     osSemaphoreAcquire(s_spi_semphr, osWaitForever);
 
-    return EWL1501AA_OK;
+    return EPD_OK;
 }
 
-ewl1501aa_ret_t ewl_impl_write_data_cb(void *handle, uint8_t *data, uint16_t len) {
+epd_ret_t ewl_impl_write_data_cb(void *handle, uint8_t *data, uint32_t len) {
     HAL_GPIO_WritePin(OLED_DC_GPIO_Port, OLED_DC_Pin, GPIO_PIN_SET);
     HAL_StatusTypeDef ret = HAL_SPI_Transmit_DMA(&hspi1, data, len);
     if(ret != HAL_OK) {
-        return EWL1501AA_FAIL;
+        return EPD_FAIL;
     }
 
     osSemaphoreAcquire(s_spi_semphr, osWaitForever);
 
-    return EWL1501AA_OK;
+    return EPD_OK;
 }
 
 void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef *hspi) {
diff --git a/STM32H750VB_APPLE.ioc b/STM32H750VB_APPLE.ioc
index 63f1c44..d553058 100644
--- a/STM32H750VB_APPLE.ioc
+++ b/STM32H750VB_APPLE.ioc
@@ -152,26 +152,27 @@ Mcu.Name=STM32H750VBTx
 Mcu.Package=LQFP100
 Mcu.Pin0=PC13
 Mcu.Pin1=PC14-OSC32_IN (OSC32_IN)
-Mcu.Pin10=PC8
-Mcu.Pin11=PC9
-Mcu.Pin12=PA9
-Mcu.Pin13=PA10
-Mcu.Pin14=PC10
-Mcu.Pin15=PC11
-Mcu.Pin16=PC12
-Mcu.Pin17=PD2
-Mcu.Pin18=VP_FATFS_VS_SDIO
-Mcu.Pin19=VP_FREERTOS_VS_CMSIS_V2
+Mcu.Pin10=PC4
+Mcu.Pin11=PC8
+Mcu.Pin12=PC9
+Mcu.Pin13=PA9
+Mcu.Pin14=PA10
+Mcu.Pin15=PC10
+Mcu.Pin16=PC11
+Mcu.Pin17=PC12
+Mcu.Pin18=PD2
+Mcu.Pin19=VP_FATFS_VS_SDIO
 Mcu.Pin2=PC15-OSC32_OUT (OSC32_OUT)
-Mcu.Pin20=VP_SYS_VS_tim7
+Mcu.Pin20=VP_FREERTOS_VS_CMSIS_V2
+Mcu.Pin21=VP_SYS_VS_tim7
 Mcu.Pin3=PH0-OSC_IN (PH0)
 Mcu.Pin4=PH1-OSC_OUT (PH1)
-Mcu.Pin5=PA4
-Mcu.Pin6=PA5
-Mcu.Pin7=PA6
-Mcu.Pin8=PA7
-Mcu.Pin9=PC4
-Mcu.PinsNb=21
+Mcu.Pin5=PA1
+Mcu.Pin6=PA4
+Mcu.Pin7=PA5
+Mcu.Pin8=PA6
+Mcu.Pin9=PA7
+Mcu.PinsNb=22
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32H750VBTx
@@ -203,6 +204,10 @@ NVIC.TimeBase=TIM7_IRQn
 NVIC.TimeBaseIP=TIM7
 NVIC.USART1_IRQn=true\:5\:0\:false\:false\:true\:true\:true\:true
 NVIC.UsageFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
+PA1.GPIOParameters=GPIO_Label
+PA1.GPIO_Label=LED
+PA1.Locked=true
+PA1.Signal=GPIO_Output
 PA10.Locked=true
 PA10.Mode=Asynchronous
 PA10.Signal=USART1_RX
diff --git a/lib/epd-spi b/lib/epd-spi
new file mode 160000
index 0000000..3f1f782
--- /dev/null
+++ b/lib/epd-spi
@@ -0,0 +1 @@
+Subproject commit 3f1f782faa7453fab6bfb81b777266de21cf5973
diff --git a/lib/ewl1501aa/CMakeLists.txt b/lib/ewl1501aa/CMakeLists.txt
deleted file mode 100644
index f48f16e..0000000
--- a/lib/ewl1501aa/CMakeLists.txt
+++ /dev/null
@@ -1,14 +0,0 @@
-cmake_minimum_required(VERSION 3.10)
-
-project(ewl1501aa)
-
-set(EWL_SRCS
-    "src/ewl1501aa.c"
-)
-
-set(EWL_INCS
-    "include"
-)
-
-add_library(${PROJECT_NAME} ${EWL_SRCS})
-target_include_directories(${PROJECT_NAME} PUBLIC ${EWL_INCS})
\ No newline at end of file
diff --git a/lib/ewl1501aa/include/ewl1501aa.h b/lib/ewl1501aa/include/ewl1501aa.h
deleted file mode 100644
index 71db492..0000000
--- a/lib/ewl1501aa/include/ewl1501aa.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#ifndef EWL1501AA_H
-#define EWL1501AA_H
-
-#include <stdint.h>
-
-typedef enum {
-    EWL1501AA_OK,
-    EWL1501AA_FAIL,
-} ewl1501aa_ret_t;
-
-typedef struct {
-    ewl1501aa_ret_t (*reset_cb)(void *handle);
-    ewl1501aa_ret_t (*write_cmd_cb)(void *handle, uint8_t *cmd, uint8_t len);
-    ewl1501aa_ret_t (*write_data_cb)(void *handle, uint8_t *data, uint16_t len);
-} ewl1501aa_cb_t;
-
-typedef struct {
-    ewl1501aa_cb_t cb;
-    void *user_data;
-} ewl1501aa_t;
-
-ewl1501aa_ret_t ewl1501aa_init(ewl1501aa_t *ewl);
-ewl1501aa_ret_t ewl1501aa_upload(ewl1501aa_t *ewl, uint8_t *data);
-ewl1501aa_ret_t ewl1501aa_power(ewl1501aa_t *ewl, uint8_t on);
-
-#endif
\ No newline at end of file
diff --git a/lib/ewl1501aa/src/ewl1501aa.c b/lib/ewl1501aa/src/ewl1501aa.c
deleted file mode 100644
index 193e099..0000000
--- a/lib/ewl1501aa/src/ewl1501aa.c
+++ /dev/null
@@ -1,62 +0,0 @@
-#include "ewl1501aa.h"
-
-#include <stddef.h>
-
-#define EWL1501_ERR_CHECK(x) \
-    if (x != EWL1501AA_OK) return EWL1501AA_FAIL
-
-static uint8_t ewl1501aa_init_param[] = {
-    0x01, 0x81, 0x9C,        // Set contrast control
-    0x01, 0xA0, 0x53,        // Set segment re-map
-    0x01, 0xA1, 0x00,        // Set display start line
-    0x01, 0xA2, 0x00,        // Set display offset
-    0x00, 0xA4,              // Set normal display mode
-    0x01, 0xA8, 0x7F,        // Set MUX ratio
-    0x01, 0xAB, 0x01,        // Set enable internal VDD regulator mode
-    0x01, 0xB1, 0x31,        // Set phase length of phase 1, phase 2
-    0x01, 0xB3, 0xF1,        // Set ratio of dividing frequency & oscillation frequency
-    0x00, 0xB9,              // Set gray scale table
-    0x01, 0xBC, 0x07,        // Set pre-charge voltage
-    0x01, 0xBE, 0x07,        // Set voltage VCOMH
-    0x02, 0x15, 0x00, 0x3F,  // Set column address
-    0x02, 0x75, 0x00, 0x7F,  // Set row address
-};
-
-static ewl1501aa_ret_t ewl1501aa_reset(ewl1501aa_t *ewl) {
-    if (ewl->cb.reset_cb != NULL) {
-        return ewl->cb.reset_cb(ewl->user_data);
-    }
-
-    return EWL1501AA_OK;
-}
-
-static ewl1501aa_ret_t ewl1501aa_init_seq(ewl1501aa_t *ewl) {
-    uint16_t seq_ptr = 0;
-    while (seq_ptr < sizeof(ewl1501aa_init_param)) {
-        EWL1501_ERR_CHECK(ewl->cb.write_cmd_cb(ewl->user_data, &ewl1501aa_init_param[seq_ptr + 1],
-                                               ewl1501aa_init_param[seq_ptr] + 1));
-        seq_ptr += ewl1501aa_init_param[seq_ptr] + 2;
-    }
-
-    return EWL1501AA_OK;
-}
-
-ewl1501aa_ret_t ewl1501aa_init(ewl1501aa_t *ewl) {
-    EWL1501_ERR_CHECK(ewl1501aa_reset(ewl));
-    EWL1501_ERR_CHECK(ewl1501aa_init_seq(ewl));
-
-    return EWL1501AA_OK;
-}
-
-ewl1501aa_ret_t ewl1501aa_upload(ewl1501aa_t *ewl, uint8_t *data) {
-    EWL1501_ERR_CHECK(ewl->cb.write_data_cb(ewl->user_data, data, 8192));
-    return EWL1501AA_OK;
-}
-
-ewl1501aa_ret_t ewl1501aa_power(ewl1501aa_t *ewl, uint8_t on) {
-    uint8_t cmd[2] = { 0xAE, 0x00 };
-    if(on) cmd[0] = 0xAF;
-    EWL1501_ERR_CHECK(ewl->cb.write_cmd_cb(ewl->user_data, cmd, 1));
-
-    return EWL1501AA_OK;
-}
\ No newline at end of file