STM32 at different frequencies to achieve a square wave output. In the 0-500HZ frequency value evenly between changes can be adjusted via the serial port 1

sn_UartFreq
...........\CoreSupport
...........\...........\core_cm3.c
...........\...........\core_cm3.h
...........\...........\startup_stm32f10x_hd.s
...........\...........\stm32f10x.h
...........\...........\stm32f10x_conf.h
...........\...........\system_stm32f10x.c
...........\...........\system_stm32f10x.h
...........\JLinkLog.txt
...........\JLinkSettings.ini
...........\OutPut
...........\......\bsp.d
...........\......\bsp.o
...........\......\ExtDll.iex
...........\......\main.crf
...........\......\main.d
...........\......\main.o
...........\......\main.__i
...........\......\misc.crf
...........\......\misc.d
...........\......\misc.o
...........\......\mystdio.crf
...........\......\mystdio.d
...........\......\mystdio.o
...........\......\os_core.d
...........\......\os_core.o
...........\......\os_cpu_a.d
...........\......\os_cpu_a.lst
...........\......\os_cpu_a.o
...........\......\os_cpu_c.d
...........\......\os_cpu_c.o
...........\......\os_dbg.d
...........\......\os_dbg.o
...........\......\os_flag.d
...........\......\os_flag.o
...........\......\os_mbox.d
...........\......\os_mbox.o
...........\......\os_mem.d
...........\......\os_mem.o
...........\......\os_mutex.d
...........\......\os_mutex.o
...........\......\os_q.d
...........\......\os_q.o
...........\......\os_sem.d
...........\......\os_sem.o
...........\......\os_task.d
...........\......\os_task.o
...........\......\os_time.d
...........\......\os_time.o
...........\......\os_tmr.d
...........\......\os_tmr.o
...........\......\Project.axf
...........\......\Project.hex
...........\......\Project.htm
...........\......\Project.lnp
...........\......\Project.map
...........\......\Project.plg
...........\......\Project.sct
...........\......\Project.tra
...........\......\spi_flash.crf
...........\......\spi_flash.d
...........\......\spi_flash.o
...........\......\startup_stm32f10x_hd.d
...........\......\startup_stm32f10x_hd.lst
...........\......\startup_stm32f10x_hd.o
...........\......\stm32f10x_adc.crf
...........\......\stm32f10x_adc.d
...........\......\stm32f10x_adc.o
...........\......\stm32f10x_bkp.crf
...........\......\stm32f10x_bkp.d
...........\......\stm32f10x_bkp.o
...........\......\stm32f10x_can.crf
...........\......\stm32f10x_can.d
...........\......\stm32f10x_can.o
...........\......\stm32f10x_cec.crf
...........\......\stm32f10x_cec.d
...........\......\stm32f10x_cec.o
...........\......\stm32f10x_crc.crf
...........\......\stm32f10x_crc.d
...........\......\stm32f10x_crc.o
...........\......\stm32f10x_dac.crf
...........\......\stm32f10x_dac.d
...........\......\stm32f10x_dac.o
...........\......\stm32f10x_dbgmcu.crf
...........\......\stm32f10x_dbgmcu.d
...........\......\stm32f10x_dbgmcu.o
...........\......\stm32f10x_dma.crf
...........\......\stm32f10x_dma.d
...........\......\stm32f10x_dma.o
...........\......\stm32f10x_exti.crf
...........\......\stm32f10x_exti.d
...........\......\stm32f10x_exti.o
...........\......\stm32f10x_flash.crf
...........\......\stm32f10x_flash.d
...........\......\stm32f10x_flash.o
...........\......\stm32f10x_fsmc.crf
...........\......\stm32f10x_fsmc.d
...........\......\stm32f10x_fsmc.o
...........\......\stm32f10x_gpio.crf

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