Through the data manual, PWM test on the IO port of the microcontroller, first of all, the IO port to have a clock signal, and then set the frequency in the program, that is, you can see the breathing light; you can also use oscilloscope testing to get square wave.

例程8 PWM输出实验
例程8 PWM输出实验\CORE
例程8 PWM输出实验\CORE\core_cm4.h
例程8 PWM输出实验\CORE\core_cm4_simd.h
例程8 PWM输出实验\CORE\startup_stm32f40_41xxx.s
例程8 PWM输出实验\FWLIB
例程8 PWM输出实验\FWLIB\inc
例程8 PWM输出实验\FWLIB\inc\misc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_adc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_can.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_crc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_cryp.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_dac.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_dbgmcu.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_dcmi.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_dma.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_dma2d.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_exti.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_flash.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_flash_ramfunc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_fmc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_fsmc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_gpio.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_hash.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_i2c.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_iwdg.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_ltdc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_pwr.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_rcc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_rng.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_rtc.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_sai.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_sdio.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_spi.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_syscfg.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_tim.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_usart.h
例程8 PWM输出实验\FWLIB\inc\stm32f4xx_wwdg.h
例程8 PWM输出实验\FWLIB\src
例程8 PWM输出实验\FWLIB\src\misc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_adc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_can.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_crc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_cryp.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_cryp_aes.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_cryp_des.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_cryp_tdes.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_dac.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_dbgmcu.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_dcmi.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_dma.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_dma2d.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_exti.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_flash.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_flash_ramfunc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_fmc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_fsmc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_gpio.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_hash.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_hash_md5.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_hash_sha1.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_i2c.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_iwdg.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_ltdc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_pwr.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_rcc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_rng.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_rtc.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_sai.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_sdio.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_spi.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_syscfg.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_tim.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_usart.c
例程8 PWM输出实验\FWLIB\src\stm32f4xx_wwdg.c
例程8 PWM输出实验\HARDWARE
例程8 PWM输出实验\HARDWARE\LED
例程8 PWM输出实验\HARDWARE\LED\led.c
例程8 PWM输出实验\HARDWARE\LED\led.h
例程8 PWM输出实验\HARDWARE\PWM
例程8 PWM输出实验\HARDWARE\PWM\pwm.c
例程8 PWM输出实验\HARDWARE\PWM\pwm.h
例程8 PWM输出实验\keilkilll.bat
例程8 PWM输出实验\OBJ
例程8 PWM输出实验\OBJ\delay.crf
例程8 PWM输出实验\OBJ\delay.d
例程8 PWM输出实验\OBJ\delay.o
例程8 PWM输出实验\OBJ\ExtDll.iex
例程8 PWM输出实验\OBJ\led.crf
例程8 PWM输出实验\OBJ\led.d
例程8 PWM输出实验\OBJ\led.o
例程8 PWM输出实验\OBJ\main.crf
例程8 PWM输出实验\OBJ\main.d
例程8 PWM输出实验\OBJ\main.o
例程8 PWM输出实验\OBJ\misc.crf
例程8 PWM输出实验\OBJ\misc.d
例程8 PWM输出实验\OBJ\misc.o
例程8 PWM输出实验\OBJ\PWM.axf
例程8 PWM输出实验\OBJ\PWM.build_log.htm
例程8 PWM输出实验\OBJ\pwm.crf

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