stm32f407 floating-point arithmetic, you can look

STM32F407 FPU浮点运算例程\SY-STM32F407 V2例程：FPU浮点运算例程\Dsp_Lib\arm_common_tables.h
.........................\....................................\.......\arm_cortexM4lf_math.lib
.........................\....................................\.......\arm_math.h
.........................\....................................\.......\core_cm0.h
.........................\....................................\.......\core_cm3.h
.........................\....................................\.......\core_cm4.h
.........................\....................................\.......\core_cm4_simd.h
.........................\....................................\.......\core_cmFunc.h
.........................\....................................\.......\core_cmInstr.h
.........................\....................................\Hardware\adc\adc.c
.........................\....................................\........\...\adc.h
.........................\....................................\........\delay\delay.c
.........................\....................................\........\.....\delay.h
.........................\....................................\........\lcd\fonts.h
.........................\....................................\........\...\lcd.c
.........................\....................................\........\...\lcd.h
.........................\....................................\........\.ed\led.c
.........................\....................................\........\...\led.h
.........................\....................................\........\rtc\rtc.c
.........................\....................................\........\...\rtc.h
.........................\....................................\........\sdcard\sdcard.c
.........................\....................................\........\......\sdcard.h
.........................\....................................\........\.piflash\spiflash.c
.........................\....................................\........\........\spiflash.h
.........................\....................................\........\touch\touch.c
.........................\....................................\........\.....\touch.h
.........................\....................................\........\usart\usart.c
.........................\....................................\........\.....\usart.h
.........................\....................................\Libraries\CMSIS\inc\arm_common_tables.h
.........................\....................................\.........\.....\...\arm_math.h
.........................\....................................\.........\.....\...\core_cm4.h
.........................\....................................\.........\.....\...\core_cm4_simd.h
.........................\....................................\.........\.....\...\core_cmFunc.h
.........................\....................................\.........\.....\...\core_cmInstr.h
.........................\....................................\.........\.....\...\stm32f4xx.h
.........................\....................................\.........\.....\...\system_stm32f4xx.h
.........................\....................................\.........\.....\src\system_stm32f4xx.c
.........................\....................................\.........\FWlib\inc\misc.h
.........................\....................................\.........\.....\...\stm32f4xx_adc.h
.........................\....................................\.........\.....\...\stm32f4xx_can.h
.........................\....................................\.........\.....\...\stm32f4xx_crc.h
.........................\....................................\.........\.....\...\stm32f4xx_cryp.h
.........................\....................................\.........\.....\...\stm32f4xx_dac.h
.........................\....................................\.........\.....\...\stm32f4xx_dbgmcu.h
.........................\....................................\.........\.....\...\stm32f4xx_dcmi.h
.........................\......

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