W600 printf hello world using a task.
Step 0: Compile and Download
wch@wch-pc /cygdrive/d/Project/sdk/example
$ ./build.sh helloworld flash COM3
start...
Step 1 : UART0 Printf
w600 hello world example, compile @Apr 23 2019 16:02:30
hello world!
hello world!
hello world!
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