based multi-task with the system clock experiments, the use of signal volume between mutually exclusive mandate to solve the problem, the system shows the time in a text box

多任务与系统时钟实验
....................\Debug
....................\Exp19.apj
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....................\...\Maro.h
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....................\...\.....\....\lwip
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....................\...\.....\....\API_MSG.H
....................\...\.....\....\arch.h
....................\...\.....\....\debug.h
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....................\...\.....\....\sys.h
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....................\...\ucos_lib.alf
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....................\...\Main.c
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....................\.......\44B.H
....................\.......\44BINIT.S
....................\.......\MEMCFG.S
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....................\.......\uhal
....................\.......\....\ISR.H
....................\.......\....\Uart.h
....................\.......\....\uhal.h

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