diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..8f9ce70
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,16 @@
+{
+    "files.associations": {
+        "spi_port.h": "c",
+        "cmd_def.h": "c",
+        "config.h": "c",
+        "crc16.h": "c",
+        "comdef.h": "c",
+        "stddef.h": "c",
+        "core.h": "c",
+        "stdint.h": "c",
+        "cor.h": "c",
+        "eprc_core.h": "c",
+        "erpc_core.h": "c",
+        "type_traits": "c"
+    }
+}
\ No newline at end of file
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..b9c966d
--- /dev/null
+++ b/config.h
@@ -0,0 +1,11 @@
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+#define ERPC_VERSION "0.0.1"
+
+
+#define u8 unsigned char
+#define u16 unsigned short
+#define u32 unsigned int
+
+#endif /* _CONFIG_H_ */
\ No newline at end of file
diff --git a/crc16.c b/crc16.c
new file mode 100644
index 0000000..7cfea11
--- /dev/null
+++ b/crc16.c
@@ -0,0 +1,68 @@
+#include "crc16.h"
+
+static const uint16_t crc16tab[256] = {
+    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 0x8108,
+    0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 0x1231, 0x0210,
+    0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 0x9339, 0x8318, 0xb37b,
+    0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 0x2462, 0x3443, 0x0420, 0x1401,
+    0x64e6, 0x74c7, 0x44a4, 0x5485, 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee,
+    0xf5cf, 0xc5ac, 0xd58d, 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6,
+    0x5695, 0x46b4, 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d,
+    0xc7bc, 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
+    0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, 0x5af5,
+    0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, 0xdbfd, 0xcbdc,
+    0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, 0x6ca6, 0x7c87, 0x4ce4,
+    0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, 0xedae, 0xfd8f, 0xcdec, 0xddcd,
+    0xad2a, 0xbd0b, 0x8d68, 0x9d49, 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13,
+    0x2e32, 0x1e51, 0x0e70, 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a,
+    0x9f59, 0x8f78, 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e,
+    0xe16f, 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
+    0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, 0x02b1,
+    0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, 0xb5ea, 0xa5cb,
+    0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, 0x34e2, 0x24c3, 0x14a0,
+    0x0481, 0x7466, 0x6447, 0x5424, 0x4405, 0xa7db, 0xb7fa, 0x8799, 0x97b8,
+    0xe75f, 0xf77e, 0xc71d, 0xd73c, 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657,
+    0x7676, 0x4615, 0x5634, 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9,
+    0xb98a, 0xa9ab, 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882,
+    0x28a3, 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
+    0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, 0xfd2e,
+    0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, 0x7c26, 0x6c07,
+    0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 0xef1f, 0xff3e, 0xcf5d,
+    0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 0x6e17, 0x7e36, 0x4e55, 0x5e74,
+    0x2e93, 0x3eb2, 0x0ed1, 0x1ef0};
+
+uint16_t crc16(const unsigned char *buf, size_t len) {
+  int counter;
+  uint16_t crc = 0;
+  for (counter = 0; counter < len; counter++)
+    crc = (crc << 8) ^ crc16tab[((crc >> 8) ^ *buf++) & 0x00FF];
+  return crc;
+}
+
+u16 cmd_cal_crc16(erpc_cmd_def_t *cmd) {
+  u16 crc = 0;
+  u32 counter = 0;
+  crc = (crc << 8) ^ crc16tab[((crc >> 8) ^ cmd->src_id) & 0x00FF];
+  crc = (crc << 8) ^ crc16tab[((crc >> 8) ^ cmd->dest_id) & 0x00FF];
+  crc = (crc << 8) ^ crc16tab[((crc >> 8) ^ cmd->msg_len) & 0x00FF];
+  crc = (crc << 8) ^ crc16tab[((crc >> 8) ^ cmd->type) & 0x00FF];
+  crc = (crc << 8) ^ crc16tab[((crc >> 8) ^ cmd->port) & 0x00FF];
+  for (counter = 0; counter < cmd->msg_len; counter++)
+    crc = (crc << 8) ^ crc16tab[((crc >> 8) ^ cmd->data[counter]) & 0x00FF];
+  cmd->crc_16[0] = (u8)(crc >> 8);
+  cmd->crc_16[1] = (u8)(crc & 0x00FF);
+  return crc;
+}
+/**
+ * 检查crc16校验
+ * return 0:校验成功
+ * return 1:校验失败
+ */
+u8 cmd_check_crc16(erpc_cmd_def_t *cmd) {
+  u16 crc = cmd_cal_crc16(cmd);
+  if (cmd->crc_16[0] != (u8)(crc >> 8) ||
+      cmd->crc_16[1] != (u8)(crc & 0x00FF)) {
+    return 1;
+  }
+  return 0;
+}
\ No newline at end of file
diff --git a/crc16.h b/crc16.h
new file mode 100644
index 0000000..adb86fb
--- /dev/null
+++ b/crc16.h
@@ -0,0 +1,18 @@
+#ifndef _CRC_CRC16_H
+#define _CRC_CRC16_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus  */
+
+#include <stddef.h>
+#include <stdint.h>
+#include "config.h"
+#include "erpc_core.h"
+uint16_t crc16(const unsigned char *buf, size_t len);
+u8 cmd_check_crc16(erpc_cmd_def_t *cmd);
+u16 cmd_cal_crc16(erpc_cmd_def_t *cmd);
+#ifdef __cplusplus
+}
+#endif /* __cplusplus  */
+#endif
diff --git a/erpc_core.c b/erpc_core.c
new file mode 100644
index 0000000..4526e07
--- /dev/null
+++ b/erpc_core.c
@@ -0,0 +1,71 @@
+#include "erpc_core.h"
+
+#include "crc16.h"
+
+u32 erpc_report_node_self(node_cfg_t *node_cfg) {
+  erpc_cmd_def_t cmd;
+  cmd.src_id = node_cfg->local_id;
+  cmd.dest_id = 0xFF;
+  cmd.msg_len = 0;
+  cmd.type = PACKAGE_TYPE_DEV_POWER_ON;
+  cmd_cal_crc16(&cmd);
+  return node_cfg->write((u8 *)&cmd, sizeof(erpc_cmd_def_t));
+}
+
+u32 erpc_search_all_node(node_cfg_t *node_cfg) {
+  erpc_cmd_def_t cmd;
+  cmd.src_id = node_cfg->local_id;
+  cmd.dest_id = 0xFF;
+  cmd.msg_len = 0;
+  cmd.type = PACKAGE_TYPE_CMD_SERCH_DEV_ONLINE;
+  cmd_cal_crc16(&cmd);
+  return node_cfg->write((u8 *)&cmd, sizeof(erpc_cmd_def_t));
+}
+
+u32 erpc_send_cmd(node_cfg_t *node_cfg, u8 dest_id, u8 *data, u32 len) {
+  erpc_cmd_def_t cmd;
+  cmd.src_id = node_cfg->local_id;
+  cmd.dest_id = dest_id;
+  cmd.msg_len = len;
+  cmd.type = PACKAGE_TYPE_CMD_REQ;
+  cmd.data = data;
+  cmd_cal_crc16(&cmd);
+  return node_cfg->write((u8 *)&cmd, sizeof(erpc_cmd_def_t) + len);
+}
+
+u32 erpc_send_cmd_ack(node_cfg_t *node_cfg, erpc_cmd_def_t *cmd_rec,
+                      u8 is_ack) {
+  erpc_cmd_def_t cmd_send;
+  cmd_send.src_id = node_cfg->local_id;
+  cmd_send.dest_id = cmd_rec->src_id;
+  if (is_ack)
+    cmd_send.type = PACKAGE_TYPE_CMD_REQ_ACK;
+  else
+    cmd_send.type = PACKAGE_TYPE_CMD_RESP_NACK;
+  cmd_send.msg_len = 0;
+  cmd_cal_crc16(&cmd_send);
+  return node_cfg->write((u8 *)&cmd_send, sizeof(erpc_cmd_def_t));
+}
+
+u32 erpc_send_repeat(node_cfg_t *node_cfg,u8 dest_id)
+{
+  erpc_cmd_def_t cmd;
+  cmd.src_id = node_cfg->local_id;
+  cmd.dest_id = dest_id;
+  cmd.type = PACKAGE_TYPE_CMD_REPEAT;
+  cmd.msg_len = 0;
+  cmd_cal_crc16(&cmd);
+  return node_cfg->write((u8 *)&cmd, sizeof(erpc_cmd_def_t));
+}
+u32 erpc_send_msg(node_cfg_t *node_cfg, u8 dest_id, u8 *data, u32 len) {
+  int retry = CMD_MAX_RETRY;
+  node_cfg->bus_lock();
+  u32 ret = 0;
+  while (retry-- > 0) {
+    u32 ret = erpc_send_cmd(node_cfg, dest_id, data, len);
+  
+  }
+  return ret;
+}
+u32 erpc_rec_msg_core(node_cfg_t *node_cfg, u8 *data, u32 len) {
+}
\ No newline at end of file
diff --git a/erpc_core.h b/erpc_core.h
new file mode 100644
index 0000000..9ebbfc9
--- /dev/null
+++ b/erpc_core.h
@@ -0,0 +1,57 @@
+#ifndef ERPC_CORE_H_
+#define ERPC_CORE_H_
+
+#include "config.h"
+
+#define MAX_CMD_LEN (256 - 5)  // crc16最大支持256字节
+#define CMD_MAX_RETRY 5        // 最大重发次数
+#define CMD_TIMEOUT 30         // 超时时间 tick
+#define MAX_COM 20  // 最大支持端口打开数量，可认为是同时通讯的号
+
+typedef enum erpc_error {
+  DEST_SYS_BUSY = 0,  // 目标系统繁忙,接收到nack
+  DEST_SYS_TIMEOUT,   // 目标系统处理超时
+  BUS_CRC_ERROR,      // 总线CRC错误,可能是总线通讯质量不佳
+};
+typedef enum package_type {
+  PACKAGE_TYPE_DEV_POWER_ON = 0,
+  PACKAGE_TYPE_CMD_REQ,
+  PACKAGE_TYPE_CMD_REQ_ACK,
+  PACKAGE_TYPE_CMD_RESP,
+  PACKAGE_TYPE_CMD_RESP_ACK,
+  PACKAGE_TYPE_CMD_RESP_NACK,
+  PACKAGE_TYPE_CMD_REPEAT,  // crc校验失败，请求重发
+  PACKAGE_TYPE_DEV_POWER_OFF,
+  PACKAGE_TYPE_CMD_SERCH_DEV_ONLINE,
+} package_type;
+
+typedef struct node_cfg_t {
+  u8 local_id;
+  struct port_t {
+    u16 com_id;
+    volatile u32 time_out;
+    void (*pre_deal)(u8 *data, u32 len);  // 数据预处理接口
+    u8 send_ack : 2;    // 0：没有ack返回，1：ack返回 2：nack返回
+    u8 rec_crc : 1;     // 0：crc没有故障， 1： crc有故障
+    u8 req_resend : 1;  // 1:客户端请求重发
+  } port[MAX_COM];
+  u32 (*write)(u8 *data, u32 len);
+  void (*bus_lock)(void);
+  void (*bus_unlock)(void);
+  void (*sleep)(void);
+} node_cfg_t;
+
+// 广播ID
+#define ERPC_BOARDCAST_ID 0xff
+
+typedef struct erpc_cmd_def_t {
+  u8 src_id;
+  u8 dest_id;
+  package_type type;
+  u16 port;  // 指令号，指令号=端口号
+  u8 msg_len;
+  u8 crc_16[2];
+  u8 *data;
+} erpc_cmd_def_t;
+
+#endif /* ERPC_CORE_H_ */
\ No newline at end of file
diff --git a/erpc设计文档.md b/erpc设计文档.md
index e69de29..74a6089 100644
--- a/erpc设计文档.md
+++ b/erpc设计文档.md
@@ -0,0 +1,58 @@
+
+
+
+CRC16 校验长度为 16-256字节较为合适。
+
+ACK丢了不重发
+
+
+
+
+# 发送指令流程
+1.发送数据后，始终要等待ack
+2.接收数据后，始终要回复ack
+3.获得ack不代表指令成功
+4.crc校验不成功，发送repeat包
+5.指令号=端口号
+
+## 正常传输
+| host             | slave            |
+| ---------------- | ---------------- |
+| 发送指令         | 等待指令         |
+| 等待ACK回复      | 发送ACK          |
+| 等待指令处理完成 | 处理指令         |
+| 等待指令处理完成 | 发送resp         |
+| 发送resp_ack     | 等待resp_ack回复 |
+| 处理完成         | 处理完成         |
+## 指令丢失
+| host             | slave                 |
+| ---------------- | --------------------- |
+| 发送指令         | 等待指令              |
+| 发送指令丢失     | 等待指令              |
+| 超时重发指令     | 等待指令              |
+| 等待ACK回复      | 指令接收成功，发送ACK |
+| 等待指令处理完成 | 处理指令              |
+| 等待指令处理完成 | 发送resp              |
+| 发送resp_ack     | 等待resp_ack回复      |
+| 处理完成         | 处理完成              |
+## cmd ack 丢失
+| host             | slave                      |
+| ---------------- | -------------------------- |
+| 发送指令         | 等待指令                   |
+| 等待ACK回复      | 指令接收成功，发送ACK      |
+| 超时重发         | 指令已经开始行，发现重发包，发送ACK|
+| 等待ACK回复      | 处理指令                            |
+| 等待指令处理完成 | 处理指令                   |
+| 等待指令处理完成 | 发送resp                   |
+| 发送resp_ack     | 等待resp_ack回复           |
+| 处理完成         | 处理完成                   |
+## resp ack 丢失
+| host             | slave            |
+| ---------------- | ---------------- |
+| 发送指令         | 等待指令         |
+| 等待ACK回复      | 发送ACK          |
+| 等待指令处理完成 | 处理指令         |
+| 等待指令处理完成 | 发送resp         |
+| 发送resp_ack     | 等待resp_ack回复 |
+| 处理完成          |发送resp         |
+| 发送resp_ack     | 处理完成         |
\ No newline at end of file
diff --git a/spi_port.c b/spi_port.c
new file mode 100644
index 0000000..e2c613d
--- /dev/null
+++ b/spi_port.c
@@ -0,0 +1,3 @@
+#include "spi_port.h"
+
+
diff --git a/spi_port.h b/spi_port.h
new file mode 100644
index 0000000..d6fb834
--- /dev/null
+++ b/spi_port.h
@@ -0,0 +1 @@
+#include "config.h"
\ No newline at end of file