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The GNU compiler can define intrinsic functions. Is there a mechanism in Keil library or whatever, to allow you to create a function in assembly and tag it as intrinsic?
How can you pop a couple bytes off the internal stack?
... it is perfectly possible to call assembler functinos from 'C'
http://www.keil.com/support/man/docs/c51/c51_ap_ctoasm.htm
I wanted to avoid the stack usage of a function call. But I finally crafted this solution: Problem. A lowlevel interrupt has locked another low level interrupt out (Timer 2 is higher in the vector table than timer 3 so takes precedence.) in Timer 2 I tested the timer 3 interrupt pending bit and then call this routine, which cleans up the stack and vectors to timer 3. problem solved. no more low level priority lockout. NAME vjump ?PR?GOTO_TMR3?vjump SEGMENT code PUBLIC GOTO_TMR3
rseg ?PR?GOTO_TMR3?vjumP ; ; designed to be called from within interrupt 2 to transfer to int 3 ; ; when this is called ACC can be trashed ; GOTO_TMR3: pop ACC ; clear the return address off the stack pop ACC POP PSW ; clear off int data POP DPL POP DPH POP B POP ACC ; ; leave reurn address on the stack. Then jump to interrupt handler with interrupt status set, so that ; timer 3 interrupt will work as if it was interrupted ; LJMP 0x0073 ;go to timer 3 interrupt handler
END
"Problem. A lowlevel interrupt has locked another low level interrupt out"
You mean this: http://www.keil.com/forum/docs/thread14896.asp ?
Problem. A lowlevel interrupt has locked another low level interrupt out (Timer 2 is higher in the vector table than timer 3 so takes precedence.)
only true if they happen at EXACTLY the same time Please read the manual. That is the only time the place in the 'priority order'/'vector table' means anything.
Erik