Traditional query I/O level of the state to determine the state of the buttons, so as to achieve the appropriate service routine

key traditional query mode\KEY+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\startup_stm32f10x_hd.lst
..........................\.......\.......\STM32-DEMO.map
..........................\.......\Output\core_cm3.crf
..........................\.......\......\core_cm3.d
..........................\.......\......\core_cm3.o
..........................\.......\......\exit.crf
..........................\.......\......\exit.d
..........................\.......\......\exit.o
..........................\.......\......\exit.__i
..........................\.......\......\ExtDll.iex
..........................\.......\......\exti.crf
..........................\.......\......\exti.d
..........................\.......\......\exti.o
..........................\.......\......\exti.__i
..........................\.......\......\key.crf
..........................\.......\......\key.d
..........................\.......\......\key.o
.....................

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