i have test the program that is correct and simple to use the uart4 and uart5 program

实验3 串口实验（串口4）\README.TXT
实验3 串口实验（串口4）\OBJ\TEST.plg
实验3 串口实验（串口4）\USER\test.c
实验3 串口实验（串口4）\USER\startup_stm32f10x_hd.s
实验3 串口实验（串口4）\USER\TEST.plg
实验3 串口实验（串口4）\USER\TEST_Target 1.dep
实验3 串口实验（串口4）\USER\TEST_Uv2.Bak
实验3 串口实验（串口4）\USER\JLinkLog.txt
实验3 串口实验（串口4）\USER\TEST.Uv2
实验3 串口实验（串口4）\USER\TEST_Opt.Bak
实验3 串口实验（串口4）\USER\TEST.Opt
实验3 串口实验（串口4）\SYSTEM\usart\usart.c
实验3 串口实验（串口4）\SYSTEM\usart\usart.h
实验3 串口实验（串口4）\SYSTEM\sys\sys.c
实验3 串口实验（串口4）\SYSTEM\sys\sys.h
实验3 串口实验（串口4）\SYSTEM\delay\delay.c
实验3 串口实验（串口4）\SYSTEM\delay\delay.h
实验3 串口实验（串口4）\HARDWARE\LED\led.c
实验3 串口实验（串口4）\HARDWARE\LED\led.h
实验3 串口实验（串口4）\HARDWARE\KEY\key.c
实验3 串口实验（串口4）\HARDWARE\KEY\key.h
实验3 串口实验（串口4）\SYSTEM\usart
实验3 串口实验（串口4）\SYSTEM\sys
实验3 串口实验（串口4）\SYSTEM\delay
实验3 串口实验（串口4）\HARDWARE\LED
实验3 串口实验（串口4）\HARDWARE\KEY
实验3 串口实验（串口4）\OBJ
实验3 串口实验（串口4）\USER
实验3 串口实验（串口4）\SYSTEM
实验3 串口实验（串口4）\HARDWARE
实验3 串口实验（串口4）

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