Hi I am using ATXmega128A1 controller and AVR studio as developing tool. I am trying to use Token-Pasting Operator (##). #define DO1_ON D, 0 #define DO1_OFF D, 1 #define DO_SET_1(X, Y) PORT ## X ##.OUTSET = PIN ## Y ## _bm #define DO_CLEAR_1(X, Y) PORT ## X ##.OUTCLR = PIN ## Y ## _bm #define DO_SET(DO_STATUS) DO_SET_1(DO_STATUS) #define DO_CLEAR(DO_STATUS) DO_CLEAR_1(DO_STATUS) I want to use below variables PORTD.OUTSET = PIN0_bm PORTD.OUTCLR = PIN0_bm PORTD.OUTSET = PIN1_bm PORTD.OUTCLR = PIN1_bm So to replicate as above I am using below macros DO_SET_1(DO1_ON); DO_ CLEAR_1(DO1_ON); But I am getting following error - "error: macro "DO_SET_1" requires 2 arguments, but only 1 given" Now if I call DO_SET(DO1_ON); DO_ CLEAR(DO1_ON); The above error is not coming. Now I am getting other error saying "error: pasting "PORTD" and "." does not give a valid preprocessing token" Queries: 1. By calling DO_SET() how does the error "DO_SET_1" requires 2 arguments, but only 1 given" is removed when DO_SET() is expanding to DO_SET_1() 2. Can't "." be used as part of Token-Pasting. Please let me know your comments. Thanks & Regards Vishnu
