📄 search.lst
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C51 COMPILER V7.00 SEARCH 03/15/2005 14:34:07 PAGE 1
C51 COMPILER V7.00, COMPILATION OF MODULE SEARCH
OBJECT MODULE PLACED IN Search.OBJ
COMPILER INVOKED BY: C:\PROGRA~1\Keil\C51\BIN\c51.exe Search.c DB OE SMALL ROM(LARGE)
stmt level source
1 //问题：二元数组在C51-ASM之间的参数传递？
2
3 //外部扩展16k RAM划分：0000H~0FFFH 存放DS18B20 ID 4K
4 // 1000H~1FFFH存放温度超限DS18B20 ID 4K
5 // 2000H~2BFFH存放CRC参数 2K
6 // 2CFFH~33FFH 2K
7 // 3400H~3FFFH存放温度数据 4K
8
9 //外部扩展EEPROM划分： 0000H~0FFFH 存放DS18B20 ID 4K
10 // 1000H~1BFFH 存放温度超限DS18B20 ID 2K
11 // 1CFFH~1FFFH 用户RAM单元 2K
12 // 2000H~3FFFH 存放温度数据 8K
13
14 extern bit data send_rom_flg;
15
16 #include<stdio.h>
17 #include<reg51.h>
18 #include<transmit_data_h.h>
19 #define FALSE 0
20 #define TRUE 1
21 ////////////////////////////////////////////////////////////////////////////
22 //Global Variables
23 unsigned char ROM[8]; // ROM Bit
24 unsigned char lastDiscrep ; // last discrepancy
25 unsigned char doneFlag ; // Done flag
26 unsigned char data FoundROM[1][8] ; // table of found ROM codes
27 //unsigned char data FoundROM_sub[1][8] ;
28 unsigned char numROMs;
29 //unsigned char data dowcrc ;
30
31 // DELAY - with an 11.059MHz crystal.
32 // Calling the routine takes about 24us, and then
33 // each count takes another 16us.
34 //
35 void delay(unsigned char useconds)
36 {
37 1 unsigned char data s;
38 1 for (s=0; s<useconds;s++);
39 1 }
40
41
42 //////////////////////////////////////////////////////////////////////////////
43 // ONE WIRE CRC
44 //
45 /*
46 unsigned char code dscrc_table[] = {
47 0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
48 157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
49 35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
50 190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
51 70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
52 219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
53 101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
54 248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
55 140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
C51 COMPILER V7.00 SEARCH 03/15/2005 14:34:07 PAGE 2
56 17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
57 175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
58 50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
59 202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
60 87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
61 233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
62 116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53
63 };
64
65
66
67
68 unsigned char OWCrc( unsigned char x)
69 {
70 dowcrc = dscrc_table[dowcrc^x];
71 return dowcrc;
72 }
73
74
75
76 */
77
78
79 // The Next function searches for the next device on the 1-wire bus. If
80 // there are no more devices on the 1-wire then false is returned.
81 //
82 unsigned char Next(void)
83 {
84 1 unsigned char m = 1; // ROM Bit index
85 1 unsigned char n = 0; // ROM Byte index
86 1 unsigned char k = 1; // bit mask
87 1 unsigned char x = 0;
88 1 unsigned char discrepMarker = 0; // discrepancy marker
89 1 unsigned char g; // Output bit
90 1 unsigned char nxt; // return value
91 1 bit data flag;
92 1
93 1 nxt = FALSE; // set the next flag to false
94 1 //dowcrc = 0; // reset the dowcrc
95 1 flag = OWReset(); // reset the 1-wire flag=0 表示正常复位
96 1
97 1 if(flag||doneFlag) // no parts -> return false
98 1 {
99 2 lastDiscrep = 0; // reset the search
100 2 return FALSE;
101 2 }
102 1 OWWriteByte(0xF0); // send SearchROM command
103 1 do
104 1 // for all eight bytes
105 1 {
106 2 x = 0;
107 2 if(OWReadBit()==1) x = 2;
108 2 delay(6);
109 2 if(OWReadBit()==1) x |= 1; // and its complement
110 2 if(x ==3) // there are no devices on the 1-wire
111 2 break;
112 2 else
113 2 {
114 3 if(x>0) // all devices coupled have 0 or 1
115 3 g = x>>1; // bit write value for search
116 3 else
117 3 {
C51 COMPILER V7.00 SEARCH 03/15/2005 14:34:07 PAGE 3
118 4 // if this discrepancy is before the last
119 4 // discrepancy on a previous Next then pick
120 4 // the same as last time
121 4 if(m<lastDiscrep)
122 4 g = ((ROM[n]&k)>0);
123 4 else // if equal to last pick 1
124 4 g = (m==lastDiscrep); // if not then pick 0
125 4 // if 0 was picked then record
126 4 // position with mask k
127 4 if (g==0) discrepMarker = m;
128 4 }
129 3 if(g==1) // isolate bit in ROM[n] with mask k
130 3 ROM[n] |= k;
131 3 else
132 3 ROM[n] &= ~k;
133 3 OWWriteBit(g); // ROM search write
134 3 m++; // increment bit counter m
135 3 k = k<<1; // and shift the bit mask k
136 3 if(k==0) // if the mask is 0 then go to new ROM
137 3 { // byte n and reset mask
138 4 // OWCrc(ROM[n]); // accumulate the CRC
139 4 n++; k++;
140 4 }
141 3 }
142 2 }while(n<8); //loop until through all ROM bytes 0-7
143 1
144 1 // if(m<65||dowcrc) // if search was unsuccessful then
145 1 if(m<65)
146 1 lastDiscrep=0; // reset the last discrepancy to 0
147 1 else
148 1 {
149 2 // search was successful, so set lastDiscrep,
150 2 // lastOne, nxt
151 2 lastDiscrep = discrepMarker;
152 2 doneFlag = (lastDiscrep==0);
153 2 nxt = TRUE; // indicates search is not complete yet, more
154 2 // parts remain
155 2 }
156 1 return nxt;
157 1 }
158
159
160
161 // FIRST
162 // The First function resets the current state of a ROM search and calls
163 // Next to find the first device on the 1-wire bus.
164 //
165 unsigned char First(void)
166 {
167 1 lastDiscrep = 0; // reset the rom search last discrepancy global
168 1 doneFlag = FALSE;
169 1 return Next(); // call Next and return its return value
170 1 }
171
172
173
174
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