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脉冲采样(国外英文资料)
脉冲采样(国外英文资料)
Liu Yongqiang 16:49:45
SCM data acquisition system oscilloscope interface source
Assembly language output subroutine SUCU:
SUCU:SETB P1.7; the external sync signal is high
MOV, A, #0FFH; set the start flag to a high level
MOV DPTR, 0400H; sets the DAC0832 address
MOVX, @DPTR, A; send the start mark high
CPL P1.7; the external synchronization signal is over
INC A; set the start flag to 0
MOVX, @DPTR, A; send start flag low
DEC A
MOVX, @DPTR, A
INC A
MOVX, @DPTR, A; bold start mark
CALL SJCS; call data transfer subroutine
MOV, A, 90H
MOV DPTR, 0400H; sets the DAC0832 address
MOVX, @DPTR, A; send end mark high
MOV, A, 70H
MOVX, @DPTR, A; send end mark low
MOV, A, 90H
MOVX, @DPTR, A
MOV, A, 70H
MOVX, @DPTR, A; bold end mark
RET
Data transfer subroutine SJCS:
SJCS:MOV, R6, 00H;
LOOP0:MOV, P2, R6;
MOV, R1, 00H
LOOP1:DJNZ, R1, LOOP1
INC R6
CJNE, R6, 04H, LOOP0
RET
//keil c6.20c is directly embedded in the assembly method! (C51BBS, netizen Cuiwei)
//asm.h
#ifdef ASM
Unsigned, long, shiftR1 (register, unsigned, long);
#else
Extern, unsigned, long, shiftR1 (register, unsigned, long);
#endif
//end of asm.h
//asm.c
#define ASM
#include asm.h
#include reg52.h
#pragma OT (4, speed)
Unsigned, long, shiftR1 (register, unsigned, long, x)
{
#pragma ASM
CLR C
MOV, a, R4
RRC a
MOV, R4, a
MOV, a, R5
RRC a
MOV, R5, a
MOV, a, R6
RRC a
MOV, R6, a
MOV, a, R7
RRC a
MOV, R7, a
#pragma endasm
Return (x);
}
//end of asm.c
This * source file to compile the project file,
/ / the cursor point to this file, select the right click menu option for fileasm.c,
/ / attribute single properties in Generate Assembler SRC File Assemble SRC File
Two / set to black V will be Link Public Only V removed, then the compiler can.
/ / any position by this method can be used in the source code of C #pragma ASM and #pragma endasm embedded assembly language.
/ / but should pay attention to carefully in the direct use of parameter optimization, resulting in different levels of the different assembly code,
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