utilize timer capture funtion to measure pulse width, which can apply to ultrasonic ranging.

HC-SR04_2in1_1610181019
HC-SR04_2in1_1610181019\Doc
HC-SR04_2in1_1610181019\Doc\readme.txt
HC-SR04_2in1_1610181019\keilkill.bat
HC-SR04_2in1_1610181019\Libraries
HC-SR04_2in1_1610181019\Libraries\CMSIS
HC-SR04_2in1_1610181019\Libraries\CMSIS\core_cm3.c
HC-SR04_2in1_1610181019\Libraries\CMSIS\core_cm3.h
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_cl.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_hd.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_hd_vl.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_ld.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_ld_vl.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_md.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_md_vl.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\startup\startup_stm32f10x_xl.s
HC-SR04_2in1_1610181019\Libraries\CMSIS\stm32f10x.h
HC-SR04_2in1_1610181019\Libraries\CMSIS\system_stm32f10x.c
HC-SR04_2in1_1610181019\Libraries\CMSIS\system_stm32f10x.h
HC-SR04_2in1_1610181019\Libraries\FWlib
HC-SR04_2in1_1610181019\Libraries\FWlib\inc
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\misc.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_adc.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_bkp.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_can.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_cec.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_crc.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_dac.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_dbgmcu.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_dma.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_exti.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_flash.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_fsmc.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_gpio.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_i2c.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_iwdg.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_pwr.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_rcc.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_rtc.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_sdio.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_spi.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_tim.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_usart.h
HC-SR04_2in1_1610181019\Libraries\FWlib\inc\stm32f10x_wwdg.h
HC-SR04_2in1_1610181019\Libraries\FWlib\src
HC-SR04_2in1_1610181019\Libraries\FWlib\src\misc.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_adc.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_bkp.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_can.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_cec.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_crc.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_dac.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_dbgmcu.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_dma.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_exti.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_flash.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_fsmc.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_gpio.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_i2c.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_iwdg.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_pwr.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_rcc.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_rtc.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_sdio.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_spi.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_tim.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_usart.c
HC-SR04_2in1_1610181019\Libraries\FWlib\src\stm32f10x_wwdg.c
HC-SR04_2in1_1610181019\Listing
HC-SR04_2in1_1610181019\Listing\startup_stm32f10x_hd.lst
HC-SR04_2in1_1610181019\Listing\流水灯.map
HC-SR04_2in1_1610181019\Output
HC-SR04_2in1_1610181019\Output\bsp_input_capture.crf
HC-SR04_2in1_1610181019\Output\bsp_input_capture.d
HC-SR04_2in1_1610181019\Output\bsp_input_capture.o
HC-SR04_2in1_1610181019\Output\bsp_led.crf
HC-SR04_2in1_1610181019\Output\bsp_led.d
HC-SR04_2in1_1610181019\Output\bsp_led.o
HC-SR04_2in1_1610181019\Output\bsp_systick.crf
HC-SR04_2in1_1610181019\Output\bsp_systick.d
HC-SR04_2in1_1610181019\Output\bsp_systick.o
HC-SR04_2in1_1610181019\Output\bsp_usart1.crf
HC-SR04_2in1_1610181019\Output\bsp_usart1.d
HC-SR04_2in1_1610181019\Output\bsp_usart1.o
HC-SR04_2in1_1610181019\Output\core_cm3.crf
HC-SR04_2in1_1610181019\Output\core_cm3.d
HC-SR04_2in1_1610181019\Output\core_cm3.o
HC-SR04_2in1_1610181019\Output\ExtDll.iex
HC-SR04_2in1_1610181019\Output\iSO-STM32_输入捕获.dep
HC-SR04_2in1_1610181019\Output\main.crf
HC-SR04_2in1_1610181019\Output\main.d
HC-SR04_2in1_1610181019\Output\main.o
HC-SR04_2in1_1610181019\Output\misc.crf
HC-SR04_2in1_1610181019\Output\misc.d
HC-SR04_2in1_1610181019\Output\misc.o
HC-SR04_2in1_1610181019\Output\startup_stm32f10x_hd.d
HC-SR04_2in1_1610181019\Output\startup_stm32f10x_hd.o
HC-SR04_2in1_1610181019\Output\stm32f10x_adc.crf
HC-SR04_2in1_1610181019\Output\stm32f10x_adc.d

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