diff --git a/Core/Src/main.c b/Core/Src/main.c
index 7c9d785..450c9bf 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -114,7 +114,12 @@ void SystemClock_Config(void)
   */
   __HAL_RCC_PWR_CLK_ENABLE();
   __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
-
+  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
+  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
+  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5) != HAL_OK)
+  {
+    Error_Handler();
+  }
   /** Initializes the RCC Oscillators according to the specified parameters
   * in the RCC_OscInitTypeDef structure.
   */
diff --git a/stm32f4discovery.cfg b/stm32f4discovery.cfg
new file mode 100644
index 0000000..1174370
--- /dev/null
+++ b/stm32f4discovery.cfg
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# This is an STM32F4 discovery board with a single STM32F407VGT6 chip.
+# http://www.st.com/internet/evalboard/product/252419.jsp
+
+
+# 去OpenOCD的路径下去找这个文件
+source [find interface/stlink.cfg]
+#如果用DAP调试器就取消 下面的注释，并注释掉上方代码
+#source [find interface/cmsis-dap.cfg]
+
+transport select hla_swd
+
+source [find target/stm32f4x.cfg]