_atomic_

#include <intrins.h>

void _atomic_ (
  unsigned int n);      /* number of instructions to protect */

The _atomic_ routine allows you to protect a number of instructions from hardware interrupts. When you use this function, the C166 Compiler inserts an ATOMIC instruction into your program. The argument n specifies the number of instructions to protect (1-4).

If a value of 0 is used for n, the _endatomic_ function must be used to terminate the atomic sequence. The compiler automatically calculates the number of instructions protected from interrupts.

Note

• Typically, you should use _atomic_(0) to begin an atomic sequence and _endatomic_() to terminate the sequence. This process automatically generates the correct atomic length.
• The _atomic_ and _endatomic_ routines may be used only when the MOD167 control is specified because the ATOMIC instruction is available only in the C167 instruction set.

 1    #pragma MOD167
 2    #include <intrins.h>
 3
 4    int  i;
 5
 6    void main (void)  {
 7      _atomic_(0);   /* compiler calculates 'n' */
 8      i = i + 10;
 9      _endatomic_(); /* terminate _atomic_(0) */
10    }ASSEMBLY LISTING OF GENERATED OBJECT CODE

             ; FUNCTION main (BEGIN  RMASK = @0x0010)
                                    ; SOURCE LINE # 6
                                    ; SOURCE LINE # 7
0000 D110          ATOMIC  #02H
                                    ; SOURCE LINE # 8
0002 E0A4          MOV     R4,#0AH
0004 04F40000 R    ADD     i,R4
                                    ; SOURCE LINE # 9
                                    ; SOURCE LINE # 10
0008 CB00          RET
             ; FUNCTION main (END    RMASK = @0x0010)