Hi Now I do this like below: in appBLE.cfg var SysCallback = xdc.useModule('xdc.runtime.SysCallback'); var SysStd = xdc.useModule('xdc.runtime.SysStd'); var System = xdc.useModule('xdc.runtime.System'); /* Use the minimal user-supplied callback provider */ System.SupportProxy = SysStd; in app #include void func (void){ ..... System_printf("Printf Fun Ok"); } But IAR build project show the error message no definition for "__dwrite"[referenced from xxwritebuffered.o(dl7M_tln.a)] Error while running Linker So the problem is about setting IAR compile or xxx.cfg Thanks
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