Based on STM32 32-bit MCU system-tick experiment, it can be used to do a precise time delay function, accurate to us-level！

5-SysTick\SysTick（us+ms）（LED）\CMSIS\core_cm3.c
.........\.......................\.....\core_cm3.h
.........\.......................\.....\startup\startup_stm32f10x_hd.s
.........\.......................\.....\.......\startup_stm32f10x_ld.s
.........\.......................\.....\.......\startup_stm32f10x_md.s
.........\.......................\.....\stm32f10x.h
.........\.......................\.....\system_stm32f10x.c
.........\.......................\.....\system_stm32f10x.h
.........\.......................\FWlib\inc\misc.h
.........\.......................\.....\...\stm32f10x_adc.h
.........\.......................\.....\...\stm32f10x_bkp.h
.........\.......................\.....\...\stm32f10x_can.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_iwdg.h
.........\.......................\.....\...\stm32f10x_pwr.h
.........\.......................\.....\...\stm32f10x_rcc.h
.........\.......................\.....\...\stm32f10x_rtc.h
.........\.......................\.....\...\stm32f10x_sdio.h
.........\.......................\.....\...\stm32f10x_spi.h
.........\.......................\.....\...\stm32f10x_tim.h
.........\.......................\.....\...\stm32f10x_usart.h
.........\.......................\.....\...\stm32f10x_wwdg.h
.........\.......................\.....\src\misc.c
.........\.......................\.....\...\stm32f10x_adc.c
.........\.......................\.....\...\stm32f10x_bkp.c
.........\.......................\.....\...\stm32f10x_can.c
.........\.......................\.....\...\stm32f10x_crc.c
.........\.......................\.....\...\stm32f10x_dac.c
.........\.......................\.....\...\stm32f10x_dbgmcu.c
.........\.......................\.....\...\stm32f10x_dma.c
.........\.......................\.....\...\stm32f10x_exti.c
.........\.......................\.....\...\stm32f10x_flash.c
.........\.......................\.....\...\stm32f10x_fsmc.c
.........\.......................\.....\...\stm32f10x_gpio.c
.........\.......................\.....\...\stm32f10x_i2c.c
.........\.......................\.....\...\stm32f10x_iwdg.c
.........\.......................\.....\...\stm32f10x_pwr.c
.........\.......................\.....\...\stm32f10x_rcc.c
.........\.......................\.....\...\stm32f10x_rtc.c
.........\.......................\.....\...\stm32f10x_sdio.c
.........\.......................\.....\...\stm32f10x_spi.c
.........\.......................\.....\...\stm32f10x_tim.c
.........\.......................\.....\...\stm32f10x_usart.c
.........\.......................\.....\...\stm32f10x_wwdg.c
.........\.......................\Listing\STM32-DEMO.map
.........\.......................\Output\core_cm3.crf
.........\.......................\......\core_cm3.d
.........\.......................\......\core_cm3.o
.........\.......................\......\led.crf
.........\.......................\......\led.d
.........\.......................\......\led.o
.........\.......................\......\led.__i
.........\.......................\......\main.crf
.........\.......................\......\main.d
.........\.......................\......\main.o
.........\.......................\......\main.__i
.........\.......................\......\startup_stm32f10x_hd.d
.........\.......................\......\startup_stm32f10x_hd.o
.........\.......................\......\STM32-DEMO.axf
.........\.......................\......\STM32-DEMO.hex
.........\.......................\......\STM32-DEMO.htm
.........\.......................\......\STM32-DEMO.lnp
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