I use KeilC uVision4 for 89C51 MCU. By "Inline ASM", i can easily direct write value to R7 register, like this :
#pragma ASM MOV R7, #10 #pragma ENDASM
But now, there are some reason that i have to write to R7 register direct from C (not from inline ASM), eg:
R7 = 10;
Of course, the C compiler does not understand R7 as MCU Register (not Inline ASM).
-> Is there anyway to solve this problem. Please help me if anyone know, thanks a lot !
When it comes to programming, there is not always a clear right or wrong.
However, some methods have clear advantages and some clear disadvantages. I can see no advantage in what you're trying to do - And I think others here would concur. It is simply cumbersome and potentially error prone.
A piece of complicated looking code does not mean that author is a genius. On the contrary, quite often it is the simple elegant pieces of code that are written by the smarter people.
There's nothing much simpler than a software delay loop - Why try to complicate it?
"I can see no advantage in what you're trying to do"
Absolutely: no advantage whatsoever; but plenty of clear disadvantages!!
"often it is the simple elegant pieces of code that are written by the smarter people."
Indeed - hence the "Engineer" comment earlier!
;-)