📄 sd.lst
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C51 COMPILER V7.06 SD 12/28/2009 14:42:33 PAGE 1
C51 COMPILER V7.06, COMPILATION OF MODULE SD
OBJECT MODULE PLACED IN sd.OBJ
COMPILER INVOKED BY: d:\Keil\C51\BIN\C51.EXE sd.c DEBUG OBJECTEXTEND
stmt level source
1 /*-----------------------------------------------
2 名称：读SD卡写彩屏
3 公司：上海浩豚电子科技有限公司
4 网站：www.doflye.net
5 编写：师访
6 日期：2009.12
7 修改：无
8 内容：通过读出SD卡中320x240像素、16位BMP图片的HEX数据，依次写到屏上，还原图片
9 注意事项：由于SD卡使用SPI模式，并且是块读取(512Byte),所以需要单片机提供大于512的可用RAM，以供缓冲使用
10 这里可以选择STC89c52RD+、STC89C58RD+、STC89C516RD+，后缀RD+表明扩展RAM是1024字节，RC表明扩展RA
-M256字节
11 ------------------------------------------------*/
12 #include <reg52.h>
13 #include <stdio.h>
14 #include<9325TP.h>
15 //=============================================================
16 //定义SD卡需要的4根信号线
17 sbit SD_CLK = P1^1;
18 sbit SD_DI = P1^2;
19 sbit SD_DO = P1^0;
20 sbit SD_CS = P1^3;
21 //===========================================================
22 //定义按键端口
23 sbit KEY = P3^2;
24 //===========================================================
25 //定义512字节缓冲区，注意需要使用 xdata关键字
26 unsigned char xdata DATA[512];
27
28 //===========================================================
29 //写一字节到SD卡,模拟SPI总线方式
30 void SdWrite(unsigned char n)
31 {
32 1
33 1 unsigned char i;
34 1
35 1 for(i=8;i;i--)
36 1 {
37 2 SD_CLK=0;
38 2 SD_DI=(n&0x80);
39 2 n<<=1;
40 2 SD_CLK=1;
41 2 }
42 1 SD_DI=1;
43 1 }
44 //===========================================================
45 //从SD卡读一字节,模拟SPI总线方式
46 unsigned char SdRead()
47 {
48 1 unsigned char n,i;
49 1 for(i=8;i;i--)
50 1 {
51 2 SD_CLK=0;
52 2 SD_CLK=1;
53 2 n<<=1;
54 2 if(SD_DO) n|=1;
C51 COMPILER V7.06 SD 12/28/2009 14:42:33 PAGE 2
55 2
56 2 }
57 1 return n;
58 1 }
59 //============================================================
60 //检测SD卡的响应
61 unsigned char SdResponse()
62 {
63 1 unsigned char i=0,response;
64 1
65 1 while(i<=8)
66 1 {
67 2 response = SdRead();
68 2 if(response==0x00)
69 2 break;
70 2 if(response==0x01)
71 2 break;
72 2 i++;
73 2 }
74 1 return response;
75 1 }
76 //================================================================
77 //发命令到SD卡
78 void SdCommand(unsigned char command, unsigned long argument, unsigned char CRC)
79 {
80 1
81 1 SdWrite(command|0x40);
82 1 SdWrite(((unsigned char *)&argument)[0]);
83 1 SdWrite(((unsigned char *)&argument)[1]);
84 1 SdWrite(((unsigned char *)&argument)[2]);
85 1 SdWrite(((unsigned char *)&argument)[3]);
86 1 SdWrite(CRC);
87 1 }
88 //================================================================
89 //初始化SD卡
90 unsigned char SdInit(void)
91 {
92 1 int delay=0, trials=0;
93 1 unsigned char i;
94 1 unsigned char response=0x01;
95 1
96 1 SD_CS=1;
97 1 for(i=0;i<=9;i++)
98 1 SdWrite(0xff);
99 1 SD_CS=0;
100 1
101 1 //Send Command 0 to put MMC in SPI mode
102 1 SdCommand(0x00,0,0x95);
103 1
104 1
105 1 response=SdResponse();
106 1
107 1 if(response!=0x01)
108 1 {
109 2 return 0;
110 2 }
111 1
112 1 while(response==0x01)
113 1 {
114 2 SD_CS=1;
115 2 SdWrite(0xff);
116 2 SD_CS=0;
C51 COMPILER V7.06 SD 12/28/2009 14:42:33 PAGE 3
117 2 SdCommand(0x01,0x00ffc000,0xff);
118 2 response=SdResponse();
119 2 }
120 1
121 1 SD_CS=1;
122 1 SdWrite(0xff);
123 1 return 1;
124 1 }
125 //================================================================
126 //往SD卡指定地址写数据,一次最多512字节
127 unsigned char SdWriteBlock(unsigned char *Block, unsigned long address,int len)
128 {
129 1 unsigned int count;
130 1 unsigned char dataResp;
131 1 //Block size is 512 bytes exactly
132 1 //First Lower SS
133 1
134 1 SD_CS=0;
135 1 //Then send write command
136 1 SdCommand(0x18,address,0xff);
137 1
138 1 if(SdResponse()==00)
139 1 {
140 2 SdWrite(0xff);
141 2 SdWrite(0xff);
142 2 SdWrite(0xff);
143 2 //command was a success - now send data
144 2 //start with DATA TOKEN = 0xFE
145 2 SdWrite(0xfe);
146 2 //now send data
147 2 for(count=0;count<len;count++) SdWrite(*Block++);
148 2
149 2 for(;count<512;count++) SdWrite(0);
150 2 //data block sent - now send checksum
151 2 SdWrite(0xff); //两字节CRC校验, 为0XFFFF 表示不考虑CRC
152 2 SdWrite(0xff);
153 2 //Now read in the DATA RESPONSE token
154 2 dataResp=SdRead();
155 2 //Following the DATA RESPONSE token
156 2 //are a number of BUSY bytes
157 2 //a zero byte indicates the MMC is busy
158 2
159 2 while(SdRead()==0);
160 2
161 2 dataResp=dataResp&0x0f; //mask the high byte of the DATA RESPONSE token
162 2 SD_CS=1;
163 2 SdWrite(0xff);
164 2 if(dataResp==0x0b)
165 2 {
166 3 //printf("DATA WAS NOT ACCEPTED BY CARD -- CRC ERROR\n");
167 3 return 0;
168 3 }
169 2 if(dataResp==0x05)
170 2 return 1;
171 2
172 2 //printf("Invalid data Response token.\n");
173 2 return 0;
174 2 }
175 1 //printf("Command 0x18 (Write) was not received by the MMC.\n");
176 1 return 0;
177 1 }
178
C51 COMPILER V7.06 SD 12/28/2009 14:42:33 PAGE 4
179 //=======================================================================
180 //从SD卡指定地址读取数据,一次最多512字节
181 unsigned char SdReadBlock(unsigned char *Block, unsigned long address,int len)
182 {
183 1 unsigned int count;
184 1 //Block size is 512 bytes exactly
185 1 //First Lower SS
186 1
187 1 //printf("MMC_read_block\n");
188 1
189 1 SD_CS=0;
190 1 //Then send write command
191 1 SdCommand(0x11,address,0xff);
192 1
193 1 if(SdResponse()==00)
194 1 {
195 2 //command was a success - now send data
196 2 //start with DATA TOKEN = 0xFE
197 2 while(SdRead()!=0xfe);
198 2
199 2 for(count=0;count<len;count++) *Block++=SdRead();
200 2
201 2 for(;count<512;count++) SdRead();
202 2
203 2 //data block sent - now send checksum
204 2 SdRead();
205 2 SdRead();
206 2 //Now read in the DATA RESPONSE token
207 2 SD_CS=1;
208 2 SdRead();
209 2 return 1;
210 2 }
211 1 //printf("Command 0x11 (Read) was not received by the MMC.\n");
212 1 return 0;
213 1 }
214
215 //============================================================
216 //主程序
217 main()
218 {
219 1 unsigned int x,y; //定义液晶屏坐标
220 1 unsigned long j; //执行循环需要的临时变量
221 1 unsigned int i;
222 1 unsigned long AddTemp=393728;//SD卡地址初始值，这里是512扇区，512x512=262144，根据实际SD卡内容更改
223 1 CS=1;
224 1 delayms(5);
225 1 RES=0;
226 1 delayms(5);
227 1 RES=1;
228 1 delayms(5);
229 1 ILI9325_Initial();//液晶屏初始化
230 1 SdInit(); //SD卡初始化
231 1 while(1)
232 1 {
233 2
234 2 for(j=0;j<300;j++) //300表示一幅图片含有300x512字节的信息
235 2 {
236 3 SdReadBlock(DATA,AddTemp+(j*512),512);//每次读出512字节放到缓冲区
237 3 for(i=0;i<256;i++) //然后写到液晶屏，可以显示256个像素，每个像素16位即2个字节
238 3 {
239 4 LCD_SetPos(x,x,y,y);
240 4 Write_Data(DATA[2*i+1],DATA[2*i]);
C51 COMPILER V7.06 SD 12/28/2009 14:42:33 PAGE 5
241 4 x++;
242 4 if(x==240) //检测是否写到屏的边缘 240x320
243 4 {
244 5 y++;
245 5 x=0;
246 5 if(y==320)
247 5 y=0;
248 5 }
249 4 }
250 3 }
251 2 AddTemp = AddTemp+((j+20)*512); //写完一幅图片后把SD地址加300x512到下一个图片地址
252 2 while(KEY); //等待按键按下继续执行循环显示下一幅图片，如果没有按下则等待
253 2
254 2 }
255 1 }
256
257
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 1460 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = 512 ----
PDATA SIZE = ---- ----
DATA SIZE = ---- 58
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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