diff --git a/README.md b/README.md
index 56fc9ec..5cc4c55 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,6 @@
 
 Hardware 2FA Manager
 
-https://www.adafruit.com/product/4282
-https://github.com/waveshareteam/e-Paper/tree/master
-https://www.waveshare.com/wiki/2.13inch_e-Paper_HAT_Manual#C
+ - https://www.adafruit.com/product/4282
+ - https://github.com/waveshareteam/e-Paper/tree/master
+ - https://www.waveshare.com/wiki/2.13inch_e-Paper_HAT_Manual#C
diff --git a/c/libs/go_p2fa.h b/c/libs/go_p2fa.h
new file mode 100644
index 0000000..cdac00b
--- /dev/null
+++ b/c/libs/go_p2fa.h
@@ -0,0 +1,85 @@
+/* Code generated by cmd/cgo; DO NOT EDIT. */
+
+/* package P2FA */
+
+
+#line 1 "cgo-builtin-export-prolog"
+
+#include <stddef.h>
+
+#ifndef GO_CGO_EXPORT_PROLOGUE_H
+#define GO_CGO_EXPORT_PROLOGUE_H
+
+#ifndef GO_CGO_GOSTRING_TYPEDEF
+typedef struct { const char *p; ptrdiff_t n; } _GoString_;
+#endif
+
+#endif
+
+/* Start of preamble from import "C" comments.  */
+
+
+
+
+/* End of preamble from import "C" comments.  */
+
+
+/* Start of boilerplate cgo prologue.  */
+#line 1 "cgo-gcc-export-header-prolog"
+
+#ifndef GO_CGO_PROLOGUE_H
+#define GO_CGO_PROLOGUE_H
+
+typedef signed char GoInt8;
+typedef unsigned char GoUint8;
+typedef short GoInt16;
+typedef unsigned short GoUint16;
+typedef int GoInt32;
+typedef unsigned int GoUint32;
+typedef long long GoInt64;
+typedef unsigned long long GoUint64;
+typedef GoInt64 GoInt;
+typedef GoUint64 GoUint;
+typedef size_t GoUintptr;
+typedef float GoFloat32;
+typedef double GoFloat64;
+#ifdef _MSC_VER
+#include <complex.h>
+typedef _Fcomplex GoComplex64;
+typedef _Dcomplex GoComplex128;
+#else
+typedef float _Complex GoComplex64;
+typedef double _Complex GoComplex128;
+#endif
+
+/*
+  static assertion to make sure the file is being used on architecture
+  at least with matching size of GoInt.
+*/
+typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];
+
+#ifndef GO_CGO_GOSTRING_TYPEDEF
+typedef _GoString_ GoString;
+#endif
+typedef void *GoMap;
+typedef void *GoChan;
+typedef struct { void *t; void *v; } GoInterface;
+typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
+
+#endif
+
+/* End of boilerplate cgo prologue.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern __declspec(dllexport) void loadConfigs();
+extern __declspec(dllexport) GoSlice getConfigNames();
+extern __declspec(dllexport) GoString getCode(GoString configName);
+extern __declspec(dllexport) GoUint64 getTimeRemaining(GoInt n);
+extern __declspec(dllexport) GoUint64 getTimeRemainingMS(GoInt n);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/c/pic/100x100.bmp b/c/pic/100x100.bmp
new file mode 100644
index 0000000..70f4584
Binary files /dev/null and b/c/pic/100x100.bmp differ
diff --git a/c/pic/2in13_1.bmp b/c/pic/2in13_1.bmp
new file mode 100644
index 0000000..84e6497
Binary files /dev/null and b/c/pic/2in13_1.bmp differ
diff --git a/c/src/p2fa.c b/c/src/p2fa.c
index 4d7825d..b79cd29 100644
--- a/c/src/p2fa.c
+++ b/c/src/p2fa.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <signal.h>
 
+#include "../libs/go_p2fa.h"
 #include "images.h"
 #include "../libs/e-Paper/EPD_2in13_V4.h"
 #include "../libs/GUI/GUI_Paint.h"
@@ -19,6 +20,31 @@ void Handler(int sigNum) {
 }
 
 int draw() {
+    if (DEV_Module_Init() != 0) {
+        return -1;
+    }
+    EPD_2in13_V4_Init();
+
+    Paint_Clear(WHITE);
+    const char *confName = "default";
+    Paint_DrawString(5, 5, getCode(GoString{confName, strlen(confName)}).p, &Font24, WHITE, BLACK);
+
+    DEV_Delay_ms(5000);
+
+    Debug("Clear...\r\n");
+    EPD_2in13_V4_Init();
+    EPD_2in13_V4_Clear();
+
+    Debug("Goto Sleep...\r\n");
+    EPD_2in13_V4_Sleep();
+    DEV_Delay_ms(2000);//important, at least 2s
+    // close 5V
+    Debug("close 5V, Module enters 0 power consumption ...\r\n");
+    DEV_Module_Exit();
+    return 0;
+}
+
+int drawOld() {
     Debug("EPD_2in13_V4_test Demo\r\n");
     if(DEV_Module_Init()!=0){
         return -1;
diff --git a/go/go.mod b/go/go.mod
index 6cee1ea..040ad0c 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -3,3 +3,5 @@ module P2FA
 go 1.23.2
 
 require github.com/creachadair/otp v0.5.0
+
+require github.com/creachadair/wirepb v0.0.0-20240525191938-8530265c0822 // indirect
diff --git a/go/go.sum b/go/go.sum
index 4957390..492bad3 100644
--- a/go/go.sum
+++ b/go/go.sum
@@ -2,3 +2,7 @@ github.com/creachadair/mds v0.21.3 h1:RRgEAPIb52cU0q7UxGyN+13QlCVTZIL4slRr0cYYQf
 github.com/creachadair/mds v0.21.3/go.mod h1:1ltMWZd9yXhaHEoZwBialMaviWVUpRPvMwVP7saFAzM=
 github.com/creachadair/otp v0.5.0 h1:q3Th7CXm2zlmCdBjw5tEPFOj4oWJMnVL5HXlq0sNKS0=
 github.com/creachadair/otp v0.5.0/go.mod h1:0kceI87EnYFNYSTL121goJVAnk3eJhaed9H0nMuJUkA=
+github.com/creachadair/wirepb v0.0.0-20240525191938-8530265c0822 h1:qMXKIQdq1vG9AQjejDZ6GEab9DNWb72O/dvxEpJF/yA=
+github.com/creachadair/wirepb v0.0.0-20240525191938-8530265c0822/go.mod h1:N3X4c2/WeOpnFyf5lL46Pc3VXFrfqdwCR+JIHNCHaGU=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
diff --git a/go/main.go b/go/main.go
index 14285f0..2edd6cf 100644
--- a/go/main.go
+++ b/go/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"C"
 	"crypto/hmac"
 	"crypto/sha1"
 	"crypto/sha256"
@@ -21,6 +22,7 @@ var configs map[string]otp.Config
 
 func getSha1() func() hash.Hash { return sha1.New }
 
+//export loadConfigs
 func loadConfigs() {
 	var homeDir string
 
@@ -121,31 +123,28 @@ func loadConfigs() {
 	}
 }
 
-func refreshTokenVar() {
-	token, _ = otp.DefaultTOTP("alksjdfhalksjdbf")
+//export getConfigNames
+func getConfigNames() []string {
+	names := make([]string, 0, len(configs))
+	for name := range configs {
+		names = append(names, name)
+	}
+	return names
 }
 
+//export getCode
+func getCode(configName string) string {
+	return configs[configName].TOTP()
+}
+
+//export getTimeRemaining
 func getTimeRemaining(n int) uint64 {
 	return uint64(n) - (uint64(time.Now().Unix()) % uint64(n))
 }
 
-func main() {
-	//loadConfigs()
-
-	startUI()
-
-	//refreshTokenVar()
-	//
-	//getTimeRemaining(30)
-	//
-	//for i := 0; i < 5; i++ {
-	//	refreshTokenVar()
-	//	fmt.Printf("TOTP: %s\n", token)
-	//	for getTimeRemaining(30) > 1 {
-	//		time.Sleep(1 * time.Second)
-	//		fmt.Printf("\rTime Remaining: %ds", getTimeRemaining(30))
-	//	}
-	//	time.Sleep(1 * time.Second)
-	//	fmt.Print("\n")
-	//}
+//export getTimeRemainingMS
+func getTimeRemainingMS(n int) uint64 {
+	return (uint64(n) * 1000) - (uint64(time.Now().UnixNano()/1e6) % (uint64(n) * 1000))
 }
+
+func main() {}
diff --git a/go/ui.go b/go/ui.go.old
similarity index 81%
rename from go/ui.go
rename to go/ui.go.old
index 60d8039..7bd1eac 100644
--- a/go/ui.go
+++ b/go/ui.go.old
@@ -2,10 +2,9 @@ package main
 
 /*
 #cgo CFLAGS: -I.
-#cgo LDFLAGS: -L. -llibp2fa -lSDL2 -lSDL2main
+#cgo LDFLAGS: -L. -llibp2fa
 
-#include "../c/libs/include/SDL2/SDL.h"
-#include "../c/p2fa.h"
+#include "../c/src/p2fa.h"
 */
 import "C"