The program is based on the STM32 external trigger counter frequency measurement program code, can be measured in the range of 0-100MHZ error of less than 1 .

STM32计数法测频率
.................\hardware
.................\........\12232
.................\........\.....\12232.c
.................\........\.....\12232.h
.................\........\.....\readme.txt
.................\........\TIMx_EXTERN_CLK
.................\........\...............\TIMx_EXTERN_CLK.c
.................\........\...............\timx_extern_clk.h
.................\STM32F10x
.................\.........\cortexm3_macro.h
.................\.........\stm32f10x.h
.................\.........\stm32f10x_adc.h
.................\.........\stm32f10x_bkp.h
.................\.........\stm32f10x_can.h
.................\.........\stm32f10x_cl.h
.................\.........\stm32f10x_conf.h
.................\.........\stm32f10x_crc.h
.................\.........\stm32f10x_dac.h
.................\.........\stm32f10x_dbgmcu.h
.................\.........\stm32f10x_dma.h
.................\.........\stm32f10x_exti.h
.................\.........\stm32f10x_flash.h
.................\.........\stm32f10x_fsmc.h
.................\.........\stm32f10x_gpio.h
.................\.........\stm32f10x_i2c.h
.................\.........\stm32f10x_it.h
.................\.........\stm32f10x_iwdg.h
.................\.........\stm32f10x_lib.h
.................\.........\stm32f10x_map.h
.................\.........\stm32f10x_nvic.h
.................\.........\stm32f10x_pwr.h
.................\.........\stm32f10x_rcc.h
.................\.........\stm32f10x_rtc.h
.................\.........\stm32f10x_sdio.h
.................\.........\stm32f10x_spi.h
.................\.........\stm32f10x_systick.h
.................\.........\stm32f10x_tim.h
.................\.........\stm32f10x_type.h
.................\.........\stm32f10x_usart.h
.................\.........\stm32f10x_wwdg.h
.................\.........\system_stm32f10x.h
.................\.........\system_stm32f10x_cl.h
.................\.........\USB
.................\.........\...\usb_core.h
.................\.........\...\usb_def.h
.................\.........\...\usb_init.h
.................\.........\...\usb_int.h
.................\.........\...\usb_lib.h
.................\.........\...\usb_mem.h
.................\.........\...\usb_regs.h
.................\.........\...\usb_type.h
.................\system
.................\......\delay
.................\......\.....\delay.c
.................\......\.....\delay.h
.................\......\sys
.................\......\...\sys.c
.................\......\...\sys.h
.................\......\usart
.................\......\.....\usart.c
.................\......\.....\usart.h
.................\user
.................\....\12232.crf
.................\....\12232.d
.................\....\12232.o
.................\....\delay.crf
.................\....\delay.d
.................\....\delay.o
.................\....\ExtDll.iex
.................\....\exti.crf
.................\....\exti.d
.................\....\exti.o
.................\....\JLink Regs CM3.txt
.................\....\JLinkLog.txt
.................\....\JLinkSettings.ini
.................\....\key.crf
.................\....\key.d
.................\....\key.o
.................\....\key_exti.axf
.................\....\key_exti.htm
.................\....\key_exti.lnp
.................\....\key_exti.map
.................\....\key_exti.sct
.................\....\key_exti.tra
.................\....\key_exti.uvgui.Administrator
.................\....\key_exti.uvgui.hp
.................\....\key_exti.uvgui_Administrator.bak
.................\....\key_exti.uvgui_hp.bak
.................\....\key_exti.uvopt
.................\....\key_exti.uvproj
.................\....\key_exti_Target 1.dep
.................\....\key_exti_uvopt.bak
.................\....\key_exti_uvproj.bak
.................\....\led.crf
.................\....\led.d
.................\....\led.o
.................\....\main.c
.................\....\main.crf
.................\....\main.d

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