📄 sd.lst
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C51 COMPILER V7.50 SD 08/15/2010 13:32:15 PAGE 1
C51 COMPILER V7.50, COMPILATION OF MODULE SD
OBJECT MODULE PLACED IN sd.OBJ
COMPILER INVOKED BY: D:\Program Files\KEIL\C51\BIN\C51.EXE sd.c DEBUG OBJECTEXTEND
line level source
1 /*-----------------------------------------------
2
3 ------------------------------------------------*/
4 #include <reg52.h>
5 #include <intrins.h>
6 #include <stdio.h>
7 #include<9325TP.h>
8 //=============================================================
9 //定义SD卡需要的4根信号线
10 sbit SD_CLK = P1^1;
11 sbit SD_DI = P1^2;
12 sbit SD_DO = P1^0;
13 sbit SD_CS = P1^3;
14 //===========================================================
15 //定义按键端口
16 sbit KEY = P3^2;
17 //===========================================================
18 //定义512字节缓冲区，注意需要使用 xdata关键字
19 unsigned char xdata DATA[75]={0};
20 unsigned char xdata DATA1[75]={0};
21
22 //===========================================================
23 //写一字节到SD卡,模拟SPI总线方式
24 void SdWrite(unsigned char n)
25 {
26 1
27 1 unsigned char i;
28 1
29 1 for(i=8;i;i--)
30 1 {
31 2 SD_CLK=0;
32 2 SD_DI=(n&0x80);
33 2 n<<=1;
34 2 SD_CLK=1;
35 2 }
36 1 SD_DI=1;
37 1 }
38 //===========================================================
39 //从SD卡读一字节,模拟SPI总线方式
40 unsigned char SdRead()
41 {
42 1 unsigned char n,i;
43 1 for(i=8;i;i--)
44 1 {
45 2 SD_CLK=0;
46 2 SD_CLK=1;
47 2 n<<=1;
48 2 if(SD_DO) n|=1;
49 2
50 2 }
51 1 return n;
52 1 }
53 //============================================================
54 //检测SD卡的响应
55 unsigned char SdResponse()
C51 COMPILER V7.50 SD 08/15/2010 13:32:15 PAGE 2
56 {
57 1 unsigned char i=0,response;
58 1
59 1 while(i<=8)
60 1 {
61 2 response = SdRead();
62 2 if(response==0x00)
63 2 break;
64 2 if(response==0x01)
65 2 break;
66 2 i++;
67 2 }
68 1 return response;
69 1 }
70 //================================================================
71 //发命令到SD卡
72 void SdCommand(unsigned char command, unsigned long argument, unsigned char CRC)
73 {
74 1
75 1 SdWrite(command|0x40);
76 1 SdWrite(((unsigned char *)&argument)[0]);
77 1 SdWrite(((unsigned char *)&argument)[1]);
78 1 SdWrite(((unsigned char *)&argument)[2]);
79 1 SdWrite(((unsigned char *)&argument)[3]);
80 1 SdWrite(CRC);
81 1 }
82 //================================================================
83 //初始化SD卡
84 unsigned char SdInit(void)
85 {
86 1 int delay=0, trials=0;
87 1 unsigned char i;
88 1 unsigned char response=0x01;
89 1
90 1 SD_CS=1;
91 1 for(i=0;i<=9;i++)
92 1 SdWrite(0xff);
93 1 SD_CS=0;
94 1
95 1 //Send Command 0 to put MMC in SPI mode
96 1 SdCommand(0x00,0,0x95);
97 1
98 1
99 1 response=SdResponse();
100 1
101 1 if(response!=0x01)
102 1 {
103 2 return 0;
104 2 }
105 1
106 1 while(response==0x01)
107 1 {
108 2 SD_CS=1;
109 2 SdWrite(0xff);
110 2 SD_CS=0;
111 2 SdCommand(0x01,0x00ffc000,0xff);
112 2 response=SdResponse();
113 2 }
114 1
115 1 SD_CS=1;
116 1 SdWrite(0xff);
117 1 return 1;
C51 COMPILER V7.50 SD 08/15/2010 13:32:15 PAGE 3
118 1 }
119 //================================================================
120 //往SD卡指定地址写数据,一次最多512字节
121 unsigned char SdWriteBlock(unsigned char *Block, unsigned long address,int len)
122 {
123 1 unsigned int count;
124 1 unsigned char dataResp;
125 1 //Block size is 512 bytes exactly
126 1 //First Lower SS
127 1
128 1 SD_CS=0;
129 1 //Then send write command
130 1 SdCommand(0x18,address,0xff);
131 1
132 1 if(SdResponse()==00)
133 1 {
134 2 SdWrite(0xff);
135 2 SdWrite(0xff);
136 2 SdWrite(0xff);
137 2 //command was a success - now send data
138 2 //start with DATA TOKEN = 0xFE
139 2 SdWrite(0xfe);
140 2 //now send data
141 2 for(count=0;count<len;count++) SdWrite(*Block++);
142 2
143 2 for(;count<512;count++) SdWrite(0);
144 2 //data block sent - now send checksum
145 2 SdWrite(0xff); //两字节CRC校验, 为0XFFFF 表示不考虑CRC
146 2 SdWrite(0xff);
147 2 //Now read in the DATA RESPONSE token
148 2 dataResp=SdRead();
149 2 //Following the DATA RESPONSE token
150 2 //are a number of BUSY bytes
151 2 //a zero byte indicates the MMC is busy
152 2
153 2 while(SdRead()==0);
154 2
155 2 dataResp=dataResp&0x0f; //mask the high byte of the DATA RESPONSE token
156 2 SD_CS=1;
157 2 SdWrite(0xff);
158 2 if(dataResp==0x0b)
159 2 {
160 3 //printf("DATA WAS NOT ACCEPTED BY CARD -- CRC ERROR\n");
161 3 return 0;
162 3 }
163 2 if(dataResp==0x05)
164 2 return 1;
165 2
166 2 //printf("Invalid data Response token.\n");
167 2 return 0;
168 2 }
169 1 //printf("Command 0x18 (Write) was not received by the MMC.\n");
170 1 return 0;
171 1 }
172
173 //=======================================================================
174 //从SD卡指定地址读取数据,一次最多512字节
175 unsigned char SdReadBlock(unsigned char *Block, unsigned long address,int len)
176 {
177 1 unsigned int count;
178 1 //Block size is 512 bytes exactly
179 1 //First Lower SS
C51 COMPILER V7.50 SD 08/15/2010 13:32:15 PAGE 4
180 1
181 1 //printf("MMC_read_block\n");
182 1
183 1 SD_CS=0;
184 1 //Then send write command
185 1 SdCommand(0x11,address,0xff);
186 1
187 1 if(SdResponse()==00)
188 1 {
189 2 //command was a success - now send data
190 2 //start with DATA TOKEN = 0xFE
191 2 while(SdRead()!=0xfe);
192 2
193 2 for(count=0;count<len;count++) *Block++=SdRead();
194 2
195 2 for(;count<512;count++) SdRead();
196 2
197 2 //data block sent - now send checksum
198 2 SdRead();
199 2 SdRead();
200 2 //Now read in the DATA RESPONSE token
201 2 SD_CS=1;
202 2 SdRead();
203 2 return 1;
204 2 }
205 1 //printf("Command 0x11 (Read) was not received by the MMC.\n");
206 1 return 0;
207 1 }
208 /********************************************************************
209 * 名称 : Com_Init()
210 * 功能 : 初始化串口程序，晶振11.0592, 波特率9600
211 * 输入 : 无
212 * 输出 : 无
213 ***********************************************************************/
214 void Com_Init(void)
215 {
216 1 TMOD = 0x20;
217 1 PCON = 0x00;
218 1 SCON = 0x50;
219 1 TH1 = 0xFd;
220 1 TL1 = 0xFd;
221 1 TR1 = 1;
222 1 }
223 //============================================================
224 //主程序
225 main()
226 {
227 1
228 1 unsigned long AddTemp=262144;//SD卡地址第一个数据物理地址初始值，可以用winhex查看，这里是512扇区，512x51
-2=262144，根据实际SD卡内容更改
229 1 unsigned char i;
230 1 unsigned char *p;
231 1 CS=1;
232 1 delayms(5);
233 1 RES=0;
234 1 delayms(5);
235 1 RES=1;
236 1 delayms(5);
237 1 SdInit(); //SD卡初始化
238 1 Com_Init();
239 1 for(i=0;i<75;i++)
240 1 {
C51 COMPILER V7.50 SD 08/15/2010 13:32:15 PAGE 5
241 2 DATA1[i]=i;
242 2 }
243 1
244 1 SdWriteBlock(DATA1, AddTemp, 75);
245 1 SdReadBlock(DATA, AddTemp, 75);
246 1 p= DATA;
247 1 while(1)
248 1 for(i=0;i<75;i++)
249 1 {
250 2 SBUF = *p+48;
251 2 while(!TI) //如果发送完毕，硬件会置位TI
252 2 {
253 3 _nop_();
254 3 }
255 2 p++;
256 2 TI = 0; //TI清零
257 2 delayms(500);
258 2 }
259 1 }
260
261
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 1335 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = 150 ----
PDATA SIZE = ---- ----
DATA SIZE = ---- 52
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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