网站没有被搜索引擎收录,天津企业seo,怎么做淘宝网站赚钱,万州那家做网站1. 问题
51单片机全局变量常量的初始化#xff0c;static code const函数内部静态变量初始化也失败#xff0c;例如
void fun()
{static int a 5;printf(a %d\n, a); //输入的不一定是5#xff0c;是之前这个地址的值#xff08;随机值#xff09;
}2. 解决…1. 问题
51单片机全局变量常量的初始化static code const函数内部静态变量初始化也失败例如
void fun()
{static int a 5;printf(a %d\n, a); //输入的不一定是5是之前这个地址的值随机值
}2. 解决方案
替换STARTUP_MA.A51启动文件
3. 问题启动文件
$NOMOD51
;------------------------------------------------------------------------------
; This file is part of the C51 Compiler package
; Startup Code for the Capital Micro AS1E5 device
; Copyright (c) 2001-2005 Keil Elektronik GmbH and Keil Software, Inc.
; Version 1.00
;
; *** Use Configuration Wizard in Context Menu ***
;------------------------------------------------------------------------------
; STARTUP_AS1E5.A51: This code is executed after processor reset.
;
; To translate this file use A51 with the following invocation:
;
; A51 STARTUP_CME3000.A51
;
; To link the modified STARTUP_CME3000.OBJ file to your application use the following
; Lx51 invocation:
;
; Lx51 your object file list, STARTUP_CME3000.OBJ controls
;
;------------------------------------------------------------------------------CSEG AT 0F8HDB 0FFH,0FFHDB DWINT5EXTRN CODE (?C_START)LJMP ?C_STARTEND
4. 新的启动文件
$NOMOD51
;------------------------------------------------------------------------------
; This file is part of the C51 Compiler package
; Copyright (c) 1988-2005 Keil Elektronik GmbH and Keil Software, Inc.
; Version 8.01
;
; *** Use Configuration Wizard in Context Menu ***
;------------------------------------------------------------------------------
; STARTUP.A51: This code is executed after processor reset.
;
; To translate this file use A51 with the following invocation:
;
; A51 STARTUP.A51
;
; To link the modified STARTUP.OBJ file to your application use the following
; Lx51 invocation:
;
; Lx51 your object file list, STARTUP.OBJ controls
;
;------------------------------------------------------------------------------
;
; User-defined h Power-On Initialization of Memory
;
; With the following EQU statements the initialization of memory
; at processor reset can be defined:
;
; o IDATALEN: IDATA memory size 0x0-0x100
; i Note: The absolute start-address of IDATA memory is always 0
; i The IDATA space overlaps physically the DATA and BIT areas.
IDATALEN EQU 80H
;
; o XDATASTART: XDATA memory start address 0x0-0xFFFF
; i The absolute start address of XDATA memory
XDATASTART EQU 0
;
; o XDATALEN: XDATA memory size 0x0-0xFFFF
; i The length of XDATA memory in bytes.
XDATALEN EQU 0
;
; o PDATASTART: PDATA memory start address 0x0-0xFFFF
; i The absolute start address of PDATA memory
PDATASTART EQU 0H
;
; o PDATALEN: PDATA memory size 0x0-0xFF
; i The length of PDATA memory in bytes.
PDATALEN EQU 0H
;
;/h
;------------------------------------------------------------------------------
;
;h Reentrant Stack Initialization
;
; The following EQU statements define the stack pointer for reentrant
; functions and initialized it:
;
; h Stack Space for reentrant functions in the SMALL model.
; q IBPSTACK: Enable SMALL model reentrant stack
; i Stack space for reentrant functions in the SMALL model.
IBPSTACK EQU 0 ; set to 1 if small reentrant is used.
; o IBPSTACKTOP: End address of SMALL model stack 0x0-0xFF
; i Set the top of the stack to the highest location.
IBPSTACKTOP EQU 0xFF 1 ; default 0FFH1
; /h
;
; h Stack Space for reentrant functions in the LARGE model.
; q XBPSTACK: Enable LARGE model reentrant stack
; i Stack space for reentrant functions in the LARGE model.
XBPSTACK EQU 0 ; set to 1 if large reentrant is used.
; o XBPSTACKTOP: End address of LARGE model stack 0x0-0xFFFF
; i Set the top of the stack to the highest location.
XBPSTACKTOP EQU 0xFFFF 1 ; default 0FFFFH1
; /h
;
; h Stack Space for reentrant functions in the COMPACT model.
; q PBPSTACK: Enable COMPACT model reentrant stack
; i Stack space for reentrant functions in the COMPACT model.
PBPSTACK EQU 0 ; set to 1 if compact reentrant is used.
;
; o PBPSTACKTOP: End address of COMPACT model stack 0x0-0xFFFF
; i Set the top of the stack to the highest location.
PBPSTACKTOP EQU 0xFF 1 ; default 0FFH1
; /h
;/h
;------------------------------------------------------------------------------
;
; Memory Page for Using the Compact Model with 64 KByte xdata RAM
; eCompact Model Page Definition
;
; iDefine the XDATA page used for PDATA variables.
; iPPAGE must conform with the PPAGE set in the linker invocation.
;
; Enable pdata memory page initalization
PPAGEENABLE EQU 0 ; set to 1 if pdata object are used.
;
; o PPAGE number 0x0-0xFF
; i uppermost 256-byte address of the page used for PDATA variables.
PPAGE EQU 0
;
; o SFR address which supplies uppermost address byte 0x0-0xFF
; i most 8051 variants use P2 as uppermost address byte
PPAGE_SFR DATA 0A0H
;
; /e
;------------------------------------------------------------------------------; Standard SFR Symbols
ACC DATA 0E0H
B DATA 0F0H
SP DATA 81H
DPL DATA 82H
DPH DATA 83H
CKCON DATA 8EH
DPC DATA 93H
DAGESEL DATA 94H
D_PAGESEL DATA 95H
T2CON DATA 0C8H
MUX_SEL DATA 0C9H
RAMMODE DATA 0F8HNAME ?C_STARTUP?C_C51STARTUP SEGMENT CODE
?STACK SEGMENT IDATARSEG ?STACKDS 30EXTRN CODE (?C_START)PUBLIC ?C_STARTUPCSEG AT 0
?C_STARTUP: LJMP STARTUP1CSEG AT 0F8HDB 0FFH,0FFH ;加密写 00H 00HDB DWINT5RSEG ?C_C51STARTUPSTARTUP1: ;T5L 初始化必须的代码;MOV DAGESEL,#01H ;MOV D_PAGESEL,#02H ;MOV CKCON,#00H;MOV DPC,#00H;MOV T2CON,#70H;MOV MUX_SEL,#60H ;WDT OFF;MOV RAMMODE,#00H ;释放APP RAM ;一, 在 startup.a51中添加MOV DAGESEL, #01H ;64K代码空间 MOV D_PAGESEL,#02H ;32K xdata 空间 0x8000 -0xffff MOV CKCON, #00H ;cpu运行在1T模式MOV DPC, #00H ;标准模式,需要指令操作xdata 的 dptr 的增减MOV T2CON, #70H ;T2 自动填装;MOV MUX_SEL, #00H ;WDT OFF,MOV MUX_SEL, #60H ;WDT OFF,Uart2引出P04,P05 Uart3引出P06,P07MOV RAMMODE, #00H
;必须在 startup.a51中第一条MOVX 指令之前的任意位置.IF IDATALEN 0 MOV R0,#IDATALEN - 1CLR A
IDATALOOP: MOV R0,ADJNZ R0,IDATALOOP
ENDIFIF XDATALEN 0MOV DPTR,#XDATASTARTMOV R7,#LOW (XDATALEN)IF (LOW (XDATALEN)) 0MOV R6,#(HIGH (XDATALEN)) 1ELSEMOV R6,#HIGH (XDATALEN)ENDIFCLR A
XDATALOOP: MOVX DPTR,AINC DPTRDJNZ R7,XDATALOOPDJNZ R6,XDATALOOP
ENDIFIF PPAGEENABLE 0MOV PPAGE_SFR,#PPAGE
ENDIFIF PDATALEN 0MOV R0,#LOW (PDATASTART)MOV R7,#LOW (PDATALEN)CLR A
PDATALOOP: MOVX R0,AINC R0DJNZ R7,PDATALOOP
ENDIFIF IBPSTACK 0
EXTRN DATA (?C_IBP)MOV ?C_IBP,#LOW IBPSTACKTOP
ENDIFIF XBPSTACK 0
EXTRN DATA (?C_XBP)MOV ?C_XBP,#HIGH XBPSTACKTOPMOV ?C_XBP1,#LOW XBPSTACKTOP
ENDIFIF PBPSTACK 0
EXTRN DATA (?C_PBP)MOV ?C_PBP,#LOW PBPSTACKTOP
ENDIFMOV SP,#?STACK-1; This code is required if you use L51_BANK.A51 with Banking Mode 4
;h Code Banking
; q Select Bank 0 for L51_BANK.A51 Mode 4
#if 0
; i Initialize bank mechanism to code bank 0 when using L51_BANK.A51 with Banking Mode 4.
EXTRN CODE (?B_SWITCH0)CALL ?B_SWITCH0 ; init bank mechanism to code bank 0
#endif
;/hLJMP ?C_STARTEND
