diff --git a/stm32f4/CMakeLists.txt b/stm32f4/CMakeLists.txt
index 19cccc2..7f7734a 100755
--- a/stm32f4/CMakeLists.txt
+++ b/stm32f4/CMakeLists.txt
@@ -24,7 +24,9 @@ add_definitions(-DUSE_STDPERIPH_DRIVER)
 
 enable_language(ASM)
 add_executable(${PROJ_NAME}.elf main.c)
-target_sources(${PROJ_NAME}.elf PUBLIC start.S)
+target_sources(${PROJ_NAME}.elf PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/start.S)
+target_sources(${PROJ_NAME}.elf PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../lark1s/lark1s.c)
+target_include_directories(${PROJ_NAME}.elf PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../lark1s)
 
 add_subdirectory(./driver driver)
 target_link_libraries(${PROJ_NAME}.elf driver)
diff --git a/stm32f4/src/CMakeLists.txt b/stm32f4/src/CMakeLists.txt
index d04ad20..a39e1dd 100755
--- a/stm32f4/src/CMakeLists.txt
+++ b/stm32f4/src/CMakeLists.txt
@@ -6,8 +6,9 @@ dwin.c
 )
 
 add_library(src STATIC ${FILELIST})
-target_include_directories(src PUBLIC ../driver/cmsis)
-target_include_directories(src PUBLIC ../driver/inc)
-target_include_directories(src PUBLIC .)
+target_include_directories(src PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../driver/cmsis)
+target_include_directories(src PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../driver/inc)
+target_include_directories(src PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(src PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../../lark1s)
 
 target_link_libraries(src driver)
diff --git a/stm32f4/src/dwin.c b/stm32f4/src/dwin.c
index ba51256..c8d69e0 100644
--- a/stm32f4/src/dwin.c
+++ b/stm32f4/src/dwin.c
@@ -2,6 +2,7 @@
 #include "stm32f4xx_gpio.h"
 #include "stm32f4xx_usart.h"
 #include "stm32f4xx_dma.h"
+#include "lark1s.h"
 #include "dwin.h"
 
 #define DWIN_TX_STREAM   DMA1_Stream6
@@ -90,14 +91,138 @@ void dwin_send(uint16_t len)
     DMA_Cmd(DWIN_TX_STREAM, ENABLE);
 }
 
+static void dwin_endian_reverse_4byte(uint8_t *buffer, uint32_t val)
+{
+    buffer[0] = (uint8_t)((val >> 24) & 0xFF);
+    buffer[1] = (uint8_t)((val >> 16) & 0xFF);
+    buffer[2] = (uint8_t)((val >> 8) & 0xFF);
+    buffer[3] = (uint8_t)(val & 0xFF);
+}
+
+static void dwin_endian_reverse_2byte(uint8_t *buffer, uint16_t val)
+{
+    buffer[0] = (uint8_t)((val >> 8) & 0xFF);
+    buffer[1] = (uint8_t)(val & 0xFF);
+}
+
 void dwin_loop(void)
 {
     static uint32_t ms = 0;
+    static int flag = 0;
+    uint16_t len;
+    uint16_t i;
 
-    if (system_tick_cnt < (ms + 500)) {
+    if (system_tick_cnt < (ms + 200)) {
         return;
     }
     ms = system_tick_cnt;
+    len = 0;
+    if (flag == 0) {
+        /* read control data */
+        dwin_buff_tx[len++] = 0x5A;
+        dwin_buff_tx[len++] = 0xA5; /* frame head */
+        dwin_buff_tx[len++] = 0x04; /* length */
+        dwin_buff_tx[len++] = 0x83; /* read operation */
+        dwin_buff_tx[len++] = (DWIN_DATA_CTRL_ADDR >> 8) & 0xFF; /* address high byte */
+        dwin_buff_tx[len++] = DWIN_DATA_CTRL_ADDR & 0xFF; /* address low byte */
+        dwin_buff_tx[len++] = DWIN_DATA_CTRL_LENG; /* data length to be read */
+    } else {
+        /* write display data */
+        dwin_buff_tx[len++] = 0x5A;
+        dwin_buff_tx[len++] = 0xA5; /* frame head */
+        dwin_buff_tx[len++] = DWIN_DATA_DISP_LENG * 2 + 3; /* length */
+        dwin_buff_tx[len++] = 0x82; /* write operation */
+        dwin_buff_tx[len++] = (DWIN_DATA_DISP_ADDR >> 8) & 0xFF; /* address high byte */
+        dwin_buff_tx[len++] = DWIN_DATA_DISP_ADDR & 0xFF; /* address low byte */
+        /* gas name */
+        for (i = 0; i < 12; i++) { /* lark-1s gas name max 12 byte */
+            if (lark1s_gas_info.gas_name[i] > ' ') {
+                break;
+            }
+        }
+        for (uint16_t j = 0; j < 12 - i; j++) { /* lark-1s gas name max 12 byte */
+            dwin_buff_tx[len++] = lark1s_gas_info.gas_name[i + j];
+        }
+        for (uint16_t j = 0; j < 16 - (12 - i); j++) { /* dwin support max 16 byte */
+            dwin_buff_tx[len++] = ' ';
+        }
+        /* sn */
+        for (uint16_t j = 0; j < 16; j++) {
+            dwin_buff_tx[len++] = sn[j];
+        }
+        /* concentration */
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_data.gas3_reading);
+        len += 4;
+        /* unit name */
+        for (i = 0; i < 8; i++) { /* lark-1s unit name max 8 byte */
+            if (lark1s_gas_info.unit_name[i] > ' ') {
+                break;
+            }
+        }
+        for (uint16_t j = 0; j < 8 - i; j++) { /* lark-1s unit name max 8 byte */
+            dwin_buff_tx[len++] = lark1s_gas_info.unit_name[i + j];
+        }
+        for (uint16_t j = 0; j < 16 - (8 - i); j++) { /* dwin support max 16 byte */
+            dwin_buff_tx[len++] = ' ';
+        }
+        /* detector temperature */
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_data.det_temp);
+        len += 4;
+        /* sig CTS */
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_data.cts_gas3);
+        len += 4;
+        /* ref CTS */
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_data.cts_ref);
+        len += 4;
+        /* air pressure */
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_data.air_pressure);
+        len += 4;
+        /* range */
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_info.range);
+        len += 4;
+        /* min calibration */
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_info.min_cali);
+        len += 4;
+        /* status */
+        dwin_endian_reverse_2byte(dwin_buff_tx + len, lark1s_status.zero_record[2]);
+        len += 2;
+        dwin_endian_reverse_2byte(dwin_buff_tx + len, lark1s_status.span_record[2]);
+        len += 2;
+        dwin_endian_reverse_2byte(dwin_buff_tx + len, lark1s_status.active);
+        len += 2;
+        dwin_endian_reverse_2byte(dwin_buff_tx + len, lark1s_status.restore);
+        len += 2;
+        /* zero calibration */
+        if (lark1s_gas_cali_data.available & 1) {
+            dwin_buff_tx[len++] = 'N';
+        } else {
+            dwin_buff_tx[len++] = 'Y';
+        }
+        dwin_buff_tx[len++] = ' ';
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_cali_data.zero_det_temp);
+        len += 4;
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_cali_data.zero_sig_cts);
+        len += 4;
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_cali_data.zero_ref_cts);
+        len += 4;
+        /* span calibration */
+        if (lark1s_gas_cali_data.available & 2) {
+            dwin_buff_tx[len++] = 'N';
+        } else {
+            dwin_buff_tx[len++] = 'Y';
+        }
+        dwin_buff_tx[len++] = ' ';
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_cali_data.span_concentration);
+        len += 4;
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_cali_data.span_det_temp);
+        len += 4;
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_cali_data.span_sig_cts);
+        len += 4;
+        dwin_endian_reverse_4byte(dwin_buff_tx + len, lark1s_gas_cali_data.span_ref_cts);
+        len += 4;
+    }
+    dwin_send(len);
+    flag++;
 }
 
 void USART2_IRQHandler(void)
diff --git a/stm32f4/src/dwin.h b/stm32f4/src/dwin.h
index 86c5353..2c7f74f 100644
--- a/stm32f4/src/dwin.h
+++ b/stm32f4/src/dwin.h
@@ -1,5 +1,5 @@
-#ifndef __RS485_H__
-#define __RS485_H__
+#ifndef __DWIN_H__
+#define __DWIN_H__
 
 #ifdef __cplusplus
  extern "C" {
@@ -12,41 +12,19 @@
 #define DWIN_PIN_RX    (GPIO_Pin_3)
 #define DWIN_BAUDRATE  (115200)
 
-struct dwin_ctrl_s {
-    uint32_t baudrate;
-    uint32_t cali_conc;
-    uint8_t cali_active;
-    uint8_t cali_restore;
-    uint8_t mb_addr;
-};
 
-struct dwin_info_s {
-    uint8_t gas_name[16];
-    uint8_t sn[16];
-    uint32_t concentration;
-    uint8_t conc_unit[16];
-    uint32_t det_temp;
-    uint32_t sig_cts;
-    uint32_t ref_cts;
-    uint32_t air_pressure;
-    uint32_t range;
-    uint32_t mini_cali;
-    uint16_t sts_zero;
-    uint16_t sts_span;
-    uint16_t sts_active;
-    uint16_t sts_restore;
-    uint16_t cali_zero_enable;
-    uint16_t cali_zero_temp;
-    uint32_t cali_zero_sig;
-    uint32_t cali_zero_ref;
-    uint16_t cali_span_enable;
-    uint16_t cali_span_temp;
-    uint32_t cali_span_conc;
-    uint32_t cali_span_sig;
-    uint32_t cali_span_ref;
-};
+#define DWIN_DATA_DISP_ADDR (0x5000)
+#define DWIN_DATA_DISP_LENG (0x38)
+#define DWIN_DATA_CTRL_ADDR (0x5100)
+#define DWIN_DATA_CTRL_LENG (0x07)
 
-void dwin485_init(void);
+extern char sn[16];
+extern struct lark1s_gas_info_s lark1s_gas_info;
+extern struct lark1s_gas_cali_data_s lark1s_gas_cali_data;
+extern struct lark1s_data_s lark1s_data;
+extern struct lark1s_status_s lark1s_status;
+
+void dwin_init(void);
 void dwin_send(uint16_t len);
 void dwin_loop(void);
 
@@ -54,4 +32,4 @@ void dwin_loop(void);
 }
 #endif
 
-#endif /* __RS485_H__ */
+#endif /* __DWIN_H__ */
diff --git a/stm32f4/src/rs485.c b/stm32f4/src/rs485.c
index 84e9148..ebdef3b 100644
--- a/stm32f4/src/rs485.c
+++ b/stm32f4/src/rs485.c
@@ -3,6 +3,8 @@
 #include "stm32f4xx_usart.h"
 #include "stm32f4xx_dma.h"
 #include "rs485.h"
+#include "lark1s.h"
+#include "dwin.h"
 
 #define RS485_TX_STREAM   DMA1_Stream3
 #define RS485_RX_STREAM   DMA1_Stream1
@@ -10,6 +12,13 @@
 #define RS485_BUFF_RX_LEN (4096)
 uint8_t rs485_buff_tx[RS485_BUFF_TX_LEN] __attribute__((aligned(16)));
 uint8_t rs485_buff_rx[RS485_BUFF_RX_LEN] __attribute__((aligned(16)));
+static int __attribute__((section(".bss_ccm"))) sm = 0;
+
+char sn[16] __attribute__((section(".bss_ccm")));
+struct lark1s_gas_info_s lark1s_gas_info __attribute__((section(".bss_ccm")));
+struct lark1s_gas_cali_data_s lark1s_gas_cali_data __attribute__((section(".bss_ccm")));
+struct lark1s_data_s lark1s_data __attribute__((section(".bss_ccm")));
+struct lark1s_status_s lark1s_status __attribute__((section(".bss_ccm")));
 
 extern uint32_t system_tick_cnt;
 
@@ -109,25 +118,51 @@ void rs485_send(uint16_t len)
     DMA_Cmd(RS485_TX_STREAM, ENABLE);
 }
 
-void modbus_get_sn(void)
+void rs485_state_machine_tx(void)
 {
+    int len;
 
+    switch (sm) {
+        case 0: len = lark1s_req_sn(rs485_buff_tx); break;
+        case 1: len = lark1s_req_gas3_info(rs485_buff_tx); break;
+        case 2: len = lark1s_req_gas3_cali_data(rs485_buff_tx); break;
+        case 3: len = lark1s_req_data(rs485_buff_tx); break;
+        case 4: len = lark1s_req_status(rs485_buff_tx); break;
+        default: len = 0; break;
+    }
+    rs485_send((uint16_t)len);
 }
 
-void modbus_get_info(void)
+void rs485_state_machine_rx(int len)
 {
+    int ret = LARK1S_PARSE_OK;
 
+    switch (sm) {
+        case 0: ret = lark1s_parse_sn(rs485_buff_rx, len, sn); break;
+        case 1: ret = lark1s_parse_gas3_info(rs485_buff_rx, len, &lark1s_gas_info); break;
+        case 2: ret = lark1s_parse_gas3_cali_data(rs485_buff_rx, len, &lark1s_gas_cali_data); break;
+        case 3: ret = lark1s_parse_data(rs485_buff_rx, len, &lark1s_data); break;
+        case 4: ret = lark1s_parse_status(rs485_buff_rx, len, &lark1s_status); break;
+        default: break;
+    }
+    if (ret) {
+        return;
+    }
+    sm++;
+    if (sm > 4) {
+        sm = 0;
+    }
 }
 
 void rs485_loop(void)
 {
     static uint32_t ms = 0;
 
-    if (system_tick_cnt < (ms + 500)) {
+    if (system_tick_cnt < (ms + 200)) {
         return;
     }
     ms = system_tick_cnt;
-    // rs485_send(15);
+    rs485_state_machine_tx();
 }
 
 void USART3_IRQHandler(void)
@@ -155,9 +190,6 @@ void USART3_IRQHandler(void)
         DMA_ClearFlag(RS485_RX_STREAM, DMA_FLAG_TCIF1 | DMA_FLAG_HTIF1 | DMA_FLAG_TEIF1 | DMA_FLAG_DMEIF1 | DMA_FLAG_FEIF1);
         len = DMA_GetCurrDataCounter(RS485_RX_STREAM);
         len = RS485_BUFF_RX_LEN - len;
-        for (uint16_t i = 0; i < len; i++) {
-            rs485_buff_tx[i] = rs485_buff_rx[i] + 2;
-        }
-        rs485_send(len);
+        rs485_state_machine_rx((uint16_t)len);
     }
 }
diff --git a/stm32f4/src/rs485.h b/stm32f4/src/rs485.h
index 41c2a1c..f1a91f9 100644
--- a/stm32f4/src/rs485.h
+++ b/stm32f4/src/rs485.h
@@ -17,6 +17,8 @@
 
 void rs485_init(void);
 void rs485_send(uint16_t len);
+void rs485_state_machine_tx(void);
+void rs485_state_machine_rx(int len);
 void rs485_loop(void);
 
 #ifdef __cplusplus