stm32 key IO port operation, UART communication with a slave

communication\CM3\core_cm3.c
.............\...\core_cm3.h
.............\...\startup\arm\startup_stm32f10x_cl.s
.............\...\.......\...\startup_stm32f10x_hd.s
.............\...\.......\...\startup_stm32f10x_ld.s
.............\...\.......\...\startup_stm32f10x_md.s
.............\...\.......\gcc\startup_stm32f10x_cl.s
.............\...\.......\...\startup_stm32f10x_hd.s
.............\...\.......\...\startup_stm32f10x_ld.s
.............\...\.......\...\startup_stm32f10x_md.s
.............\...\.......\iar\startup_stm32f10x_cl.s
.............\...\.......\...\startup_stm32f10x_hd.s
.............\...\.......\...\startup_stm32f10x_ld.s
.............\...\.......\...\startup_stm32f10x_md.s
.............\...\stm32f10x.h
.............\...\system_stm32f10x.c
.............\...\system_stm32f10x.h
.............\communication.dep
.............\communication.ewd
.............\communication.ewp
.............\communication.eww
.............\Debug\Exe\communication.out
.............\.....\Obj\Button.o
.............\.....\...\communication.pbd
.............\.....\...\core_cm3.o
.............\.....\...\main.o
.............\.....\...\misc.o
.............\.....\...\Sound.o
.............\.....\...\startup_stm32f10x_md.o
.............\.....\...\stm32f10x_adc.o
.............\.....\...\stm32f10x_bkp.o
.............\.....\...\stm32f10x_can.o
.............\.....\...\stm32f10x_crc.o
.............\.....\...\stm32f10x_dac.o
.............\.....\...\stm32f10x_dbgmcu.o
.............\.....\...\stm32f10x_dma.o
.............\.....\...\stm32f10x_exti.o
.............\.....\...\stm32f10x_flash.o
.............\.....\...\stm32f10x_fsmc.o
.............\.....\...\stm32f10x_gpio.o
.............\.....\...\stm32f10x_i2c.o
.............\.....\...\stm32f10x_it.o
.............\.....\...\stm32f10x_iwdg.o
.............\.....\...\stm32f10x_pwr.o
.............\.....\...\stm32f10x_rcc.o
.............\.....\...\stm32f10x_rtc.o
.............\.....\...\stm32f10x_sdio.o
.............\.....\...\stm32f10x_spi.o
.............\.....\...\stm32f10x_tim.o
.............\.....\...\stm32f10x_usart.o
.............\.....\...\stm32f10x_wwdg.o
.............\.....\...\system_stm32f10x.o
.............\.....\...\Usart.o
.............\EW19A.tmp
.............\EW1D0.tmp
.............\library\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
......

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