From 1467a09407c6719ca2f378d8f8627f6963834ddf Mon Sep 17 00:00:00 2001
From: Shuanglei Tao <tsl0922@gmail.com>
Date: Tue, 9 Sep 2025 19:35:17 +0800
Subject: [PATCH] fix ssid length

---
 EPD/EPD_service.c | 7 +++----
 GUI/GUI.h         | 2 +-
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/EPD/EPD_service.c b/EPD/EPD_service.c
index f363848..9645c4c 100644
--- a/EPD/EPD_service.c
+++ b/EPD/EPD_service.c
@@ -49,11 +49,10 @@ static void epd_gui_update(void * p_event_data, uint16_t event_size)
         .voltage         = EPD_ReadVoltage(),
     };
 
-    char dev_name[20];
-    uint16_t dev_name_len = sizeof(dev_name);
-    uint32_t err_code = sd_ble_gap_device_name_get((uint8_t *)dev_name, &dev_name_len);
+    uint16_t dev_name_len = sizeof(data.ssid);
+    uint32_t err_code = sd_ble_gap_device_name_get((uint8_t *)data.ssid, &dev_name_len);
     if (err_code == NRF_SUCCESS && dev_name_len > 0)
-        memcpy(data.ssid, dev_name, sizeof(data.ssid) - 1);
+        data.ssid[dev_name_len] = '\0';
 
     DrawGUI(&data, epd->drv->write_image, (display_mode_t)p_epd->config.display_mode);
     epd->drv->refresh();
diff --git a/GUI/GUI.h b/GUI/GUI.h
index 12e0f5f..833c6c4 100644
--- a/GUI/GUI.h
+++ b/GUI/GUI.h
@@ -21,7 +21,7 @@ typedef struct {
     uint8_t week_start; // 0: Sunday, 1: Monday
     int8_t temperature;
     float voltage;
-    char ssid[13];
+    char ssid[20];
 } gui_data_t;
 
 void DrawGUI(gui_data_t *data, buffer_callback draw, display_mode_t mode);