📄 ds1631.lst
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219 2 I2CBitDly();
220 2 SCL = 0;
221 2 I2CBitDly();
222 2 bt = bt << 1;
223 2 }
224 1 checkack();
225 1 if(ackFlag == 0) // 如果非应答
226 1 {
227 2 NACK = 1;
228 2 return; // 若非应答表明器件错误或已坏，置错误标志位NACK
229 2 }
230 1
231 1 }
232
233
234 void I2CSendAddr(unsigned char addr, unsigned char rd)
235 {
236 1 start();
237 1 I2CSendByte(addr+rd); // send address byte
238 1 }
239
240 unsigned char I2CGetByte(unsigned char lastone) // last one == 1 for last byte; 0 for any other byte
241 {
C51 COMPILER V7.50 DS1631 12/18/2006 13:06:56 PAGE 5
242 1 register unsigned char i, res;
243 1 res = 0;
244 1 for (i=0;i<8;i++) // Each bit at a time, MSB first
245 1 {
246 2 I2CSCLHigh();
247 2 I2CBitDly();
248 2 res = res<<1;
249 2 if (SDA) res++;
250 2 SCL = 0;
251 2 I2CBitDly();
252 2 }
253 1 SDA = lastone; // Send ACK according to 'lastone'
254 1 I2CSCLHigh();
255 1 I2CBitDly();
256 1 SCL = 0;
257 1 SDA = 1; // end transmission
258 1 SCL = 1;
259 1 I2CBitDly();
260 1 return(res);
261 1 }
262
263 void WriteConfig(unsigned char Address, unsigned char Data) //Pass Device Address such as 0x90h or 0x92h
264 {
265 1 // Routine to write data to Config Register
266 1 I2CSendAddr(Address,WRITE); // send START and control byte
267 1 I2CSendByte (0xAC); // send Access Config command byte
268 1 I2CSendByte (Data); // send data
269 1 stop(); // send STOP
270 1 }
271
272
273 void GetConfig(unsigned char Address) //Pass an Address such as 0x90h or 0x92h
274 {
275 1 // Routine to read data from Config Register
276 1 I2CSendAddr(Address,WRITE); // send START and control byte
277 1 I2CSendByte(0xAC); // send Access Config command byte
278 1 I2CSendAddr(Address,READ); // send repeat START and control byte
279 1 Config = I2CGetByte(1); // read Config Register
280 1 stop(); // send STOP
281 1 }
282 /*******************************************************
283
284
285 void recnbyte()//uchar sla, uchar no)
286 {
287 uchar i,sla=0x90;
288
289 start(); // 发送启动信号
290 sendbyte(sla);
291
292 checkack(); // 检查应答位
293 if(ackFlag == 0)
294 {
295 NACK = 1;
296 return;
297 }
298
299
300 start();
301 sendbyte(sla+1); // 发送控制字 读DS1631信息
302 checkack();
303 if(ackFlag == 0)
C51 COMPILER V7.50 DS1631 12/18/2006 13:06:56 PAGE 6
304 {
305 NACK = 1;
306 return;
307 }
308 // p = rbuf; // 接收字节存放在rbuf中，指针P指向rbuf
309 for(i=0;i<2;i++)
310 {
311 rbuf[i] = recbyte();
312
313 ack(); // 收到一个字节后，MCU主机发送一个应答位
314
315 }
316 n_ack(); // 收到最后一个字节后发送一个非应答位
317 stop();
318 }
319 ********************************************************/
320
321
322 /* 主函数，模拟实现I2C总线的数据收发 */
323 void main(void)
324 {
325 1
326 1 unsigned char Address = 0x90;
327 1 WriteConfig(0x90,0x0e);
328 1 GetConfig(0x90);
329 1
330 1 while(1)
331 1 {
332 2 I2CSendAddr(Address,WRITE); // send START and control byte
333 2 I2CSendByte(0x51); // send Start Convert Tcommand byte
334 2 stop(); // send STOP
335 2 I2CBitDly(); // wait
336 2
337 2 I2CSendAddr(Address,WRITE); // send START and control byte
338 2 I2CSendByte(0xAA); // send Read Temperature command byte
339 2
340 2 I2CSendAddr(Address,READ); // send repeat START and control byte
341 2 MSB = I2CGetByte(0); // read Temp MSB
342 2 LSB = I2CGetByte(1); // read Temp LSB
343 2 stop(); // send STOP
344 2
345 2 if(MSB>=0x80) //if sign bit is set, then temp is negative
346 2 temp_c = (float)((MSB<<8 | LSB) - 65536) * 0.0625;
347 2 else
348 2 temp_c = (float)((MSB<<8|LSB) * 0.00390625);
349 2 /*
350 2 temp_f =( temp_c * 9/5) + 32;
351 2 */
352 2
353 2 }
354 1
355 1 }
356
357
358
359
360
C51 COMPILER V7.50 DS1631 12/18/2006 13:06:56 PAGE 7
NAME CLASS MSPACE TYPE OFFSET SIZE
==== ===== ====== ==== ====== ====
n_ack. . . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
temp_f . . . . . . . . . . . . . . . . PUBLIC DATA FLOAT 0000H 4
P1 . . . . . . . . . . . . . . . . . . SFR DATA U_CHAR 0090H 1
P3 . . . . . . . . . . . . . . . . . . SFR DATA U_CHAR 00B0H 1
I2CBitDly. . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
time_end . . . . . . . . . . . . . . * REG * DATA U_INT 0006H 2
index. . . . . . . . . . . . . . . . * REG * DATA U_INT 0004H 2
IE . . . . . . . . . . . . . . . . . . SFR DATA U_CHAR 00A8H 1
IP . . . . . . . . . . . . . . . . . . SFR DATA U_CHAR 00B8H 1
nackFlag . . . . . . . . . . . . . . . PUBLIC DATA BIT 0000H 1
NACK . . . . . . . . . . . . . . . . . PUBLIC DATA BIT 0001H 1
I2CSCLHigh . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
err. . . . . . . . . . . . . . . . . AUTO DATA INT 0000H 2
main . . . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
Address. . . . . . . . . . . . . . . AUTO DATA U_CHAR 0000H 1
_I2CSendAddr . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
addr . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0004H 1
rd . . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0005H 1
SLAdd. . . . . . . . . . . . . . . . . PUBLIC IDATA U_CHAR 0000H 1
ackFlag. . . . . . . . . . . . . . . . PUBLIC DATA BIT 0002H 1
delay3us . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
i. . . . . . . . . . . . . . . . . . * REG * DATA U_INT 0006H 2
ack. . . . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
start. . . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
delay5us . . . . . . . . . . . . . . . PUBLIC CODE PROC 0004H -----
i. . . . . . . . . . . . . . . . . . * REG * DATA U_INT 0006H 2
rbuf . . . . . . . . . . . . . . . . . PUBLIC IDATA ARRAY 0001H 8
checkack . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
sbuf . . . . . . . . . . . . . . . . . PUBLIC IDATA ARRAY 0009H 8
SCON . . . . . . . . . . . . . . . . . SFR DATA U_CHAR 0098H 1
TCON . . . . . . . . . . . . . . . . . SFR DATA U_CHAR 0088H 1
_I2CSendByte . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
bt . . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0003H 1
i. . . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0002H 1
_sendbyte. . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
ch . . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0007H 1
n. . . . . . . . . . . . . . . . . . AUTO IDATA U_CHAR 0000H 1
temp . . . . . . . . . . . . . . . . AUTO IDATA U_CHAR 0001H 1
_WriteConfig . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
Address. . . . . . . . . . . . . . . * REG * DATA U_CHAR 0007H 1
Data . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0001H 1
stop . . . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
_I2CGetByte. . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
lastone. . . . . . . . . . . . . . . * REG * DATA U_CHAR 0001H 1
i. . . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0002H 1
res. . . . . . . . . . . . . . . . . * REG * DATA U_CHAR 0003H 1
SDA. . . . . . . . . . . . . . . . . . ABSBIT ----- BIT 0094H 1
Config . . . . . . . . . . . . . . . . PUBLIC DATA U_CHAR 0004H 1
_GetConfig . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
Address. . . . . . . . . . . . . . . * REG * DATA U_CHAR 0001H 1
SLAdd1 . . . . . . . . . . . . . . . . PUBLIC IDATA U_CHAR 0011H 1
LSB. . . . . . . . . . . . . . . . . . PUBLIC DATA U_CHAR 0005H 1
MSB. . . . . . . . . . . . . . . . . . PUBLIC DATA U_CHAR 0006H 1
SCL. . . . . . . . . . . . . . . . . . ABSBIT ----- BIT 0096H 1
T2CON. . . . . . . . . . . . . . . . . SFR DATA U_CHAR 00C8H 1
recbyte. . . . . . . . . . . . . . . . PUBLIC CODE PROC 0000H -----
n. . . . . . . . . . . . . . . . . . AUTO IDATA U_CHAR 0000H 1
C51 COMPILER V7.50 DS1631 12/18/2006 13:06:56 PAGE 8
NAME CLASS MSPACE TYPE OFFSET SIZE
==== ===== ====== ==== ====== ====
temp . . . . . . . . . . . . . . . . AUTO IDATA U_CHAR 0001H 1
PSW. . . . . . . . . . . . . . . . . . SFR DATA U_CHAR 00D0H 1
temp_c . . . . . . . . . . . . . . . . PUBLIC DATA FLOAT 0007H 4
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 544 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 11 3
IDATA SIZE = 18 4
BIT SIZE = 3 ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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