实现STM32上面输出不同频率的方波。频率值在0-500HZ之间均匀变化，可通过串口1调节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……