NXP LPC11xx I2C Slave 从机程序

1. /****************************************************************************
   
2. *   $Id:: i2cslave.c 3635 2010-06-02 00:31:46Z usb00423                    $
   
3. *   Project: NXP LPC11xx I2C Slave example
   
4. *
   
5. *   Description:
   
6. *     This file contains I2C slave code example which include I2C slave
   
7. *     initialization, I2C slave interrupt handler, and APIs for I2C slave
   
8. *     access.
   
9. *
   
10. ****************************************************************************
    
11. * Software that is described herein is for illustrative purposes only
    
12. * which provides customers with programming information regarding the
    
13. * products. This software is supplied "AS IS" without any warranties.
    
14. * NXP Semiconductors assumes no responsibility or liability for the
    
15. * use of the software, conveys no license or title under any patent,
    
16. * copyright, or mask work right to the product. NXP Semiconductors
    
17. * reserves the right to make changes in the software without
    
18. * notification. NXP Semiconductors also make no representation or
    
19. * warranty that such application will be suitable for the specified
    
20. * use without further testing or modification.
    
21. ****************************************************************************/
    
22. #include "LPC11xx.h"/* LPC11xx Peripheral Registers */
    
23. #include "type.h"
    
24. #include "i2cslave.h"
    
25. 
    
26. volatile uint32_t I2CMasterState = I2C_IDLE;
    
27. volatile uint32_t I2CSlaveState = I2C_IDLE;
    
28. 
    
29. volatile uint32_t I2CMode;
    
30. 
    
31. volatile uint8_t I2CWrBuffer[BUFSIZE];
    
32. volatile uint8_t I2CRdBuffer[BUFSIZE];
    
33. volatile uint32_t I2CReadLength;
    
34. volatile uint32_t I2CWriteLength;
    
35. 
    
36. volatile uint32_t RdIndex = 0;
    
37. volatile uint32_t WrIndex = 0;
    
38. 
    
39. /*
    
40. From device to device, the I2C communication protocol may vary,
    
41. in the example below, the protocol uses repeated start to read data from or
    
42. write to the device:
    
43. For master read: the sequence is: STA,Addr(W),offset,RE-STA,Addr(r),data...STO
    
44. for master write: the sequence is: STA,Addr(W),offset,RE-STA,Addr(w),data...STO
    
45. Thus, in state 8, the address is always WRITE. in state 10, the address could
    
46. be READ or WRITE depending on the I2C command.
    
47. */   
    
48. 
    
49. /*****************************************************************************
    
50. ** Function name:I2C_IRQHandler
    
51. **
    
52. ** Descriptions:I2C interrupt handler, deal with master mode only.
    
53. **
    
54. ** parameters:None
    
55. ** Returned value:None
    
56. **
    
57. *****************************************************************************/
    
58. void I2C_IRQHandler(void)
    
59. {
    
60.   uint8_t StatValue;
    
61. 
    
62.   /* this handler deals with master read and master write only */
    
63.   StatValue = LPC_I2C->STAT;
    
64.   switch ( StatValue )
    
65.   {
    
66. case 0x60:/* An own SLA_W has been received. */
    
67. case 0x68:
    
68. RdIndex = 0;
    
69. LPC_I2C->CONSET = I2CONSET_AA;/* assert ACK after SLV_W is received */
    
70. LPC_I2C->CONCLR = I2CONCLR_SIC;
    
71. I2CSlaveState = I2C_WR_STARTED;
    
72. break;
    
73. case 0x80:/*  data receive */
    
74. case 0x90:
    
75. if ( I2CSlaveState == I2C_WR_STARTED )
    
76. {
    
77. I2CRdBuffer[RdIndex++] = LPC_I2C->DAT;
    
78. LPC_I2C->CONSET = I2CONSET_AA;/* assert ACK after data is received */
    
79. }
    
80. else
    
81. {
    
82. LPC_I2C->CONCLR = I2CONCLR_AAC;/* assert NACK */
    
83. }
    
84. LPC_I2C->CONCLR = I2CONCLR_SIC;
    
85. break;
    
86. case 0xA8:/* An own SLA_R has been received. */
    
87. case 0xB0:
    
88. RdIndex = 0;
    
89. LPC_I2C->CONSET = I2CONSET_AA;/* assert ACK after SLV_R is received */
    
90. LPC_I2C->CONCLR = I2CONCLR_SIC;
    
91. I2CSlaveState = I2C_RD_STARTED;
    
92. WrIndex = I2CRdBuffer[0];/* The 1st byte is the index. */
    
93. break;
    
94. case 0xB8:/* Data byte has been transmitted */
    
95. case 0xC8:
    
96. if ( I2CSlaveState == I2C_RD_STARTED )
    
97. {
    
98. LPC_I2C->DAT = I2CRdBuffer[WrIndex+1];/* write the same data back to master */
    
99. WrIndex++;/* Need to skip the index byte in RdBuffer */
    
100. LPC_I2C->CONSET = I2CONSET_AA;/* assert ACK  */
     
101. }
     
102. else
     
103. {
     
104. LPC_I2C->CONCLR = I2CONCLR_AAC;/* assert NACK  */
     
105. }
     
106. LPC_I2C->CONCLR = I2CONCLR_SIC;
     
107. break;
     
108. 
     
109. case 0xC0:/* Data byte has been transmitted, NACK */
     
110. LPC_I2C->CONCLR = I2CONCLR_AAC;/* assert NACK  */
     
111. LPC_I2C->CONCLR = I2CONCLR_SIC;
     
112. I2CSlaveState = DATA_NACK;
     
113. break;
     
114. 
     
115. case 0xA0:/* Stop condition or repeated start has */
     
116. LPC_I2C->CONSET = I2CONSET_AA;/* been received, assert ACK.  */
     
117. LPC_I2C->CONCLR = I2CONCLR_SIC;
     
118. I2CSlaveState = I2C_IDLE;
     
119. break;
     
120. 
     
121. default:
     
122. LPC_I2C->CONCLR = I2CONCLR_SIC;
     
123. LPC_I2C->CONSET = I2CONSET_I2EN | I2CONSET_SI;
     
124. break;
     
125.   }
     
126.   return;
     
127. }
     
128. 
     
129. /*****************************************************************************
     
130. ** Function name:I2CSlaveInit
     
131. **
     
132. ** Descriptions:Initialize I2C controller
     
133. **
     
134. ** parameters:I2c mode is either MASTER or SLAVE
     
135. ** Returned value:true or false, return false if the I2C
     
136. **interrupt handler was not installed correctly
     
137. **
     
138. *****************************************************************************/
     
139. void I2CSlaveInit( void )
     
140. {
     
141.   /* SSP and I2C reset are overlapped, a known bug,
     
142.   for now, both SSP and I2C use bit 0 for reset enable.
     
143.   Once the problem is fixed, change to "#if 1". */
     
144. #if 1
     
145.   LPC_SYSCON->PRESETCTRL |= (0x1<<1);
     
146. #else
     
147.   LPC_SYSCON->PRESETCTRL |= (0x1<<0);
     
148. #endif
     
149.   LPC_SYSCON->SYSAHBCLKCTRL |= (1<<5);
     
150.   LPC_IOCON->PIO0_4 &= ~0x3F;/*  I2C I/O config */
     
151.   LPC_IOCON->PIO0_4 |= 0x01;/* I2C SCL */
     
152.   LPC_IOCON->PIO0_5 &= ~0x3F;
     
153.   LPC_IOCON->PIO0_5 |= 0x01;/* I2C SDA */
     
154. 
     
155.   /*--- Clear flags ---*/
     
156.   LPC_I2C->CONCLR = I2CONCLR_AAC | I2CONCLR_SIC | I2CONCLR_STAC | I2CONCLR_I2ENC;   
     
157. 
     
158.   /*--- Reset registers ---*/
     
159. #if FAST_MODE_PLUS
     
160.   LPC_IOCON->PIO0_4 |= (0x1<<9);
     
161.   LPC_IOCON->PIO0_5 |= (0x1<<9);
     
162.   LPC_I2C->SCLL   = I2SCLL_HS_SCLL;
     
163.   LPC_I2C->SCLH   = I2SCLH_HS_SCLH;
     
164. #else
     
165.   LPC_I2C->SCLL   = I2SCLL_SCLL;
     
166.   LPC_I2C->SCLH   = I2SCLH_SCLH;
     
167. #endif
     
168. 
     
169.   LPC_I2C->ADR0 = PCF8594_ADDR;   
     
170.   I2CSlaveState = I2C_IDLE;
     
171.   
     
172.   /* Enable the I2C Interrupt */
     
173.   NVIC_EnableIRQ(I2C_IRQn);
     
174. 
     
175.   LPC_I2C->CONSET = I2CONSET_I2EN | I2CONSET_SI;
     
176.   return;
     
177. }
     
178. 
     
179. /******************************************************************************
     
180. **                            End Of File
     
181. ******************************************************************************/
     
182. 
     
183. 
     
184. 
     
185. 
     
186. 
     
187. /****************************************************************************
     
188. *   $Id:: i2cslave.h 3635 2010-06-02 00:31:46Z usb00423                    $
     
189. *   Project: NXP LPC11xx I2C Slave example
     
190. *
     
191. *   Description:
     
192. *     This file contains I2C slave code header definition.
     
193. *
     
194. ****************************************************************************
     
195. * Software that is described herein is for illustrative purposes only
     
196. * which provides customers with programming information regarding the
     
197. * products. This software is supplied "AS IS" without any warranties.
     
198. * NXP Semiconductors assumes no responsibility or liability for the
     
199. * use of the software, conveys no license or title under any patent,
     
200. * copyright, or mask work right to the product. NXP Semiconductors
     
201. * reserves the right to make changes in the software without
     
202. * notification. NXP Semiconductors also make no representation or
     
203. * warranty that such application will be suitable for the specified
     
204. * use without further testing or modification.
     
205. ****************************************************************************/
     
206. #ifndef __I2CSLAVE_H
     
207. #define __I2CSLAVE_H
     
208. 
     
209. #define FAST_MODE_PLUS      1
     
210. 
     
211. #define BUFSIZE             6
     
212. #define MAX_TIMEOUT         0x00FFFFFF
     
213. 
     
214. #define PCF8594_ADDR        0xA0
     
215. #define READ_WRITE          0x01
     
216. 
     
217. #define RD_BIT              0x01
     
218. 
     
219. #define I2C_IDLE            0
     
220. #define I2C_STARTED         1
     
221. #define I2C_RESTARTED       2
     
222. #define I2C_REPEATED_START  3
     
223. #define DATA_ACK            4
     
224. #define DATA_NACK           5
     
225. #define I2C_WR_STARTED      6
     
226. #define I2C_RD_STARTED      7
     
227. 
     
228. #define I2CONSET_I2EN       (0x1<<6)  /* I2C Control Set Register */
     
229. #define I2CONSET_AA         (0x1<<2)
     
230. #define I2CONSET_SI         (0x1<<3)
     
231. #define I2CONSET_STO        (0x1<<4)
     
232. #define I2CONSET_STA        (0x1<<5)
     
233. 
     
234. #define I2CONCLR_AAC        (0x1<<2)  /* I2C Control clear Register */
     
235. #define I2CONCLR_SIC        (0x1<<3)
     
236. #define I2CONCLR_STAC       (0x1<<5)
     
237. #define I2CONCLR_I2ENC      (0x1<<6)
     
238. 
     
239. #define I2DAT_I2C           0x00000000  /* I2C Data Reg */
     
240. #define I2ADR_I2C           0x00000000  /* I2C Slave Address Reg */
     
241. #define I2SCLH_SCLH         0x00000180  /* I2C SCL Duty Cycle High Reg */
     
242. #define I2SCLL_SCLL         0x00000180  /* I2C SCL Duty Cycle Low Reg */
     
243. #define I2SCLH_HS_SCLH      0x00000020  /* Fast Plus I2C SCL Duty Cycle High Reg */
     
244. #define I2SCLL_HS_SCLL      0x00000020  /* Fast Plus I2C SCL Duty Cycle Low Reg */
     
245. 
     
246. 
     
247. extern void I2C_IRQHandler( void );
     
248. extern void I2CSlaveInit( void );
     
249. 
     
250. #endif /* end __I2CSLAVE_H */
     
251. /****************************************************************************
     
252. **                            End Of File
     
253. *****************************************************************************/
     
254. 
     
255. 
     
256. 
     
257. /****************************************************************************
     
258. *   $Id:: i2cslvtst.c 3635 2010-06-02 00:31:46Z usb00423                   $
     
259. *   Project: NXP LPC11xx I2C example
     
260. *
     
261. *   Description:
     
262. *     This file contains I2C slave test modules, main entry, to test I2C
     
263. *     slave APIs.
     
264. *
     
265. ****************************************************************************
     
266. * Software that is described herein is for illustrative purposes only
     
267. * which provides customers with programming information regarding the
     
268. * products. This software is supplied "AS IS" without any warranties.
     
269. * NXP Semiconductors assumes no responsibility or liability for the
     
270. * use of the software, conveys no license or title under any patent,
     
271. * copyright, or mask work right to the product. NXP Semiconductors
     
272. * reserves the right to make changes in the software without
     
273. * notification. NXP Semiconductors also make no representation or
     
274. * warranty that such application will be suitable for the specified
     
275. * use without further testing or modification.
     
276. ****************************************************************************/
     
277. #include "LPC11xx.h"/* LPC11xx Peripheral Registers */
     
278. #include "type.h"
     
279. #include "i2cslave.h"
     
280. 
     
281. extern volatile uint8_t I2CWrBuffer[BUFSIZE];
     
282. extern volatile uint8_t I2CRdBuffer[BUFSIZE];
     
283. extern volatile uint32_t I2CSlaveState;
     
284. extern volatile uint32_t I2CReadLength, I2CWriteLength;
     
285. 
     
286. /*******************************************************************************
     
287. **   Main Function  main()
     
288. *******************************************************************************/
     
289. int main (void)
     
290. {
     
291.   uint32_t i;
     
292. 
     
293.   SystemInit();
     
294. 
     
295.   for ( i = 0; i < BUFSIZE; i++ )
     
296.   {
     
297. I2CRdBuffer[i] = 0x00;
     
298.   }
     
299.   
     
300.   I2CSlaveInit();/* initialize I2c */
     
301. 
     
302.   /* When the NACK occurs, the master has stopped the
     
303.   communication. Just check the content of I2CRd/WrBuffer. */
     
304.   while ( I2CSlaveState != DATA_NACK );
     
305.   return 0;
     
306. }
     
307. 
     
308. /******************************************************************************
     
309. **                            End Of File
     
310. ******************************************************************************/

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