diff --git a/main/ble_spp_client_demo.c b/main/ble_spp_client_demo.c
index 40f14ff..cb70f35 100644
--- a/main/ble_spp_client_demo.c
+++ b/main/ble_spp_client_demo.c
@@ -693,7 +693,7 @@ void ble_init()
     spp_uart_init();
 }
 
-void ble_gattc_write_char_cb(char *string, uint8_t string_length)
+void ble_gattc_write_char(char *string, uint8_t string_length)
 {
     if ((is_connect == true) && (db != NULL) && ((db + SPP_IDX_SPP_DATA_RECV_VAL)->properties & (ESP_GATT_CHAR_PROP_BIT_WRITE_NR | ESP_GATT_CHAR_PROP_BIT_WRITE)))
     {
diff --git a/main/ble_spp_client_demo.h b/main/ble_spp_client_demo.h
index 6a018c9..a451466 100644
--- a/main/ble_spp_client_demo.h
+++ b/main/ble_spp_client_demo.h
@@ -33,4 +33,4 @@ enum
 };
 
 void ble_init();
-void ble_gattc_write_char_cb(char *string, uint8_t string_length);
\ No newline at end of file
+void ble_gattc_write_char(char *string, uint8_t string_length);
\ No newline at end of file
diff --git a/main/key.c b/main/key.c
index 8afca72..3e4ce75 100644
--- a/main/key.c
+++ b/main/key.c
@@ -2,7 +2,7 @@
 #include "esp_log.h"
 #include "driver/gpio.h"
 
-static key_ble_cb_t s_ble_gattc_write_char_cb;
+static key_ble_cb_t s_ble_gattc_write_char;
 
 void key_init()
 {
@@ -27,7 +27,7 @@ void key_schedule()
         while (gpio_get_level(KEY_REC) == 0)
         {
         }
-        s_ble_gattc_write_char_cb(send_string, strlen(send_string));
+        s_ble_gattc_write_char(send_string, strlen(send_string));
         ESP_LOGI("Finny", "stop");
     }
     if (gpio_get_level(KEY_MODE) == 0)
@@ -38,9 +38,9 @@ void key_schedule()
         while (gpio_get_level(KEY_MODE) == 0)
         {
         }
-        s_ble_gattc_write_char_cb(send_string, strlen(send_string));
+        s_ble_gattc_write_char(send_string, strlen(send_string));
         ESP_LOGI("Finny", "stop");
     }
 }
 
-void key_ble_send_cmd_reg(key_ble_cb_t cb) { s_ble_gattc_write_char_cb = cb; };
\ No newline at end of file
+void key_ble_send_cmd_reg(key_ble_cb_t cb) { s_ble_gattc_write_char = cb; };
\ No newline at end of file
diff --git a/main/main.c b/main/main.c
index dfd3cd4..a790a64 100644
--- a/main/main.c
+++ b/main/main.c
@@ -45,7 +45,7 @@ void pc_uart_receive(uart_port_t uart_num)
     if (length != 0)
     {
         length = uart_read_bytes(uart_num, rx_data_buffer, length, 100);
-        ble_gattc_write_char_cb((char *)rx_data_buffer, length);
+        ble_gattc_write_char((char *)rx_data_buffer, length);
     }
 }
 
@@ -54,7 +54,7 @@ void app_main(void)
     ble_init();
 
     key_init();
-    key_ble_send_cmd_reg(ble_gattc_write_char_cb);
+    key_ble_send_cmd_reg(ble_gattc_write_char);
 
     pc_uart_init(UART_NUM_2, 18, 23);