diff --git a/bsp/stm32/libraries/STM32L5xx_HAL/SConscript b/bsp/stm32/libraries/STM32L5xx_HAL/SConscript
index 43277ae638cf355158c92cde1ef7468c737e28f5..a6cc8486ade924de1622f4e639d6fcd193ce1473 100644
--- a/bsp/stm32/libraries/STM32L5xx_HAL/SConscript
+++ b/bsp/stm32/libraries/STM32L5xx_HAL/SConscript
@@ -27,88 +27,88 @@ STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_gpio.c
 ''')
   
 if GetDepend(['RT_USING_SERIAL']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_uart.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_uart_ex.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_usart.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_usart_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_uart.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_uart_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_usart.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_usart_ex.c']
     
 if GetDepend(['RT_USING_I2C']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_i2c.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_i2c_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_i2c.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_i2c_ex.c']
 
 if GetDepend(['RT_USING_SPI']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_spi.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_spi_ex.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_qspi.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_spi.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_spi_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_qspi.c']
 
 if GetDepend(['RT_USING_USB']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_hcd.c'] 
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_pcd.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_pcd_ex.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_ll_usb.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_hcd.c'] 
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_pcd.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_pcd_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_ll_usb.c']
 
 if GetDepend(['RT_USING_CAN']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_can.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_can.c']
 
 if GetDepend(['RT_USING_HWTIMER']) or GetDepend(['RT_USING_PWM']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_lptim.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_tim.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_tim_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_lptim.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_tim.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_tim_ex.c']
 
 if GetDepend(['RT_USING_ADC']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_adc.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_adc_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_adc.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_adc_ex.c']
 
 if GetDepend(['RT_USING_DAC']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_dac.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_dac_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_dac.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_dac_ex.c']
 
 if GetDepend(['RT_USING_RTC']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_rtc.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_rtc_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_rtc.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_rtc_ex.c']
 
 if GetDepend(['RT_USING_WDT']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_iwdg.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_wwdg.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_iwdg.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_wwdg.c']
 
 if GetDepend(['RT_USING_SDIO']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_sd.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_sd_ex.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_ll_sdmmc.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_sd.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_sd_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_ll_sdmmc.c']
 
 if GetDepend(['RT_USING_AUDIO']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_sai.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_sai_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_sai.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_sai_ex.c']
 
 if GetDepend(['RT_USING_MTD_NOR']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_nor.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_nor.c']
 
 if GetDepend(['RT_USING_MTD_NAND']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_nand.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_nand.c']
 
 if GetDepend(['RT_USING_PM']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_lptim.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_lptim.c']
 
 if GetDepend(['BSP_USING_ON_CHIP_FLASH']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_flash.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_flash_ex.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_flash_ramfunc.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_flash.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_flash_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_flash_ramfunc.c']
 
 if GetDepend(['BSP_USING_FMC']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_ll_fmc.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_ll_fmc.c']
 	
 if GetDepend(['BSP_USING_GFXMMU']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_gfxmmu.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_gfxmmu.c']
 
 if GetDepend(['BSP_USING_DSI']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_dsi.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_dma2d.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_ll_dma2d.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_ltdc.c']
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_ltdc_ex.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_dsi.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_dma2d.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_ll_dma2d.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_ltdc.c']
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_ltdc_ex.c']
 	
 if GetDepend(['BSP_USING_SRAM']):
-    src += ['STM32L5xx_HAL_Driver/Src/STM32l5xx_hal_sram.c']	
+    src += ['STM32L5xx_HAL_Driver/Src/stm32l5xx_hal_sram.c']	
 	
 	
 
diff --git a/bsp/stm32/stm32l552-st-nucleo/rtconfig.py b/bsp/stm32/stm32l552-st-nucleo/rtconfig.py
index ac39dc61e6c8ae1cf9f1e99d958454e70ee90f1d..4b4a59c98f24eb9e4ada40883eef885dab0cb2c2 100644
--- a/bsp/stm32/stm32l552-st-nucleo/rtconfig.py
+++ b/bsp/stm32/stm32l552-st-nucleo/rtconfig.py
@@ -43,7 +43,7 @@ if PLATFORM == 'gcc':
     OBJDUMP = PREFIX + 'objdump'
     OBJCPY = PREFIX + 'objcopy'
 
-    DEVICE = ' -mcpu=cortex-m33 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard -ffunction-sections -fdata-sections'
+    DEVICE = ' -mcpu=cortex-m33 -mthumb -mfpu=fpv5-sp-d16 -mfloat-abi=hard -ffunction-sections -fdata-sections'
     CFLAGS = DEVICE + ' -Dgcc'
     AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -Wa,-mimplicit-it=thumb '
     LFLAGS = DEVICE + ' -Wl,--gc-sections,-Map=rt-thread.map,-cref,-u,Reset_Handler -T board/linker_scripts/link.lds'
@@ -104,7 +104,7 @@ elif PLATFORM == 'armclang':
 
     DEVICE = ' --cpu Cortex-M33.fp '
     CFLAGS = ' --target=arm-arm-none-eabi -mcpu=cortex-m4 '
-    CFLAGS += ' -mcpu=cortex-m33 -mfpu=fpv4-sp-d16 '
+    CFLAGS += ' -mcpu=cortex-m33 -mfpu=fpv5-sp-d16 '
     CFLAGS += ' -mfloat-abi=hard -c -fno-rtti -funsigned-char -fshort-enums -fshort-wchar '
     CFLAGS += ' -gdwarf-3 -ffunction-sections '
     AFLAGS = DEVICE + ' --apcs=interwork '
@@ -159,7 +159,7 @@ elif PLATFORM == 'iar':
     AFLAGS += ' -w+'
     AFLAGS += ' -r'
     AFLAGS += ' --cpu Cortex-M33'
-    AFLAGS += ' --fpu VFPv4_sp'
+    AFLAGS += ' --fpu VFPv5_sp'
     AFLAGS += ' -S'
 
     if BUILD == 'debug':