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The hello sample example in keil C can use printf to output message in serial port window#1. But, I had tried to modify my project to do the same job, it's failed. I had check option of target to be the same as hello. Compile ok. What's wrong?
I didn't modify my project from hello directly. Actually I modify one of my old project, and try to printf some message in serial window. I change the option of target in my old project as the settings in hello example. But, my own project still can not do "printf message". Hello example can do "printf" well.