CC2640:Use System_printf in project.

1.I use IAR as IDE to develop CC2640 BLE project and XDS100V3 as debugger.First make sure           enable the Semihosted and Via semihosting in General Options.
 

2.Add below code in app_ble.cfg file.

	utils.importFile("../../../../../src/common/cc26xx/kernel/cc2640/config/cc2640.cfg");
	/*
	* Extend the cc2640 configuration
	*/
	var SysStd = xdc.useModule("xdc.runtime.SysStd");
	var System = xdc.useModule("xdc.runtime.System");
	System.SupportProxy = SysStd;
	System.extendedFormats = '%$L%$S%$F%f';

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3.Add include header file and test.

	#include <xdc/runtime/System.h>
	..
	..
	..
	System_printf("Hello World!");

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4.In debug mode enable View->Terminal I/O and we can see the Hello World! in terminal.

Ref:
     1.System_printf and printf() on CC2650 sensorTag
     2.System_printf supported format specifications