diff --git a/GD32F1/system/libmaple/stm32f1/include/series/stm32.h b/GD32F1/system/libmaple/stm32f1/include/series/stm32.h
index d10be34..8f78925 100644
--- a/GD32F1/system/libmaple/stm32f1/include/series/stm32.h
+++ b/GD32F1/system/libmaple/stm32f1/include/series/stm32.h
@@ -227,27 +227,8 @@ extern "C" {
 #    define STM32_PCLK2                     F_CPU
 #    endif
 #    ifndef STM32_DELAY_US_MULT
-#if F_CPU == 120000000
-	#define STM32_DELAY_US_MULT             40 /* FIXME: value is incorrect. */
-#elif F_CPU == 96000000
-	#define STM32_DELAY_US_MULT             32 /* FIXME: value is incorrect. */
-#elif F_CPU == 72000000
-	#define STM32_DELAY_US_MULT             24 /* FIXME: value is incorrect. */
-#endif
+#		define STM32_DELAY_US_MULT 				(F_CPU / 3000000L)
 #    endif
-#elif STM32_F1_LINE == STM32_F1_LINE_VALUE        /* TODO */
-#    ifndef STM32_PCLK1
-#    define STM32_PCLK1                     12000000U
-#    endif
-#    ifndef STM32_PCLK2
-#    define STM32_PCLK2                     24000000U
-#    endif
-#    ifndef STM32_DELAY_US_MULT
-#    define STM32_DELAY_US_MULT             8 /* FIXME: value is incorrect. */
-#    endif
-#elif STM32_F1_LINE == STM32_F1_LINE_ACCESS       /* TODO */
-#elif STM32_F1_LINE == STM32_F1_LINE_USB_ACCESS   /* TODO */
-#elif STM32_F1_LINE == STM32_F1_LINE_CONNECTIVITY /* TODO */
 #endif
 
 /*