Document the PDI programming routines implemented so far in the AVRISP project. Add ability to selectively disable ISP programming support in addition to the existing ability to disable PDI programming support.

Projects/AVRISP/Lib/ISPTarget.c

@@ -28,6 +28,8 @@
   this software.
 */
 
+#if defined(ENABLE_SPI_PROTOCOL)
+
 /** \file
  *
  *  Target-related functions for the ISP Protocol decoder.
@@ -178,3 +180,5 @@ void ISPTarget_LoadExtendedAddress(void)
 	SPI_SendByte((CurrentAddress & 0x00FF0000) >> 16);
 	SPI_SendByte(0x00);	
 }
+
+#endif