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Hi, The compile error is: WARNING L15: MULTIPLE CALL TO SEGMENT SEGMENT: ?PR?_STRTONUM?PARSE CALLER1: ?PR?TC0?PERIPHERAL CALLER2: ?C_C51STARTUP The callers TC0 is an ISR using reg bank 2 and I don't know about the c51startup. The called function STRTONUM is using the directive of #pragma NOAREGS so can be called for any functions. The question is why I still got the multiple call error? Thanks for answering my question. By the way, C51 is V6.21, BL51 is V4.21 and LIB51 is V4.20. chao.
So what's going to go wrong with this method? This works!
#pragma disable void init_serial_isr (void) { ES = 1; /* enable serial interrupts */ }
; prologue PUSH IE CLR EA SETB ES ; epilogue POP IE RET
That's the sort of thing I had in mind in the last sentence (the C routine making other changes to IE). The compiler has to play it safe for the general case. In my case, I have the advantage of some extra information about what the routines are doing, so preserving IE modification isn't a problem. I suddenly panicked that I had overlooked some subtle 8051-ism about disabling interrupts and just hadn't noticed the error in the lab yet.