1 /*
2 * @brief LPC15xx I2C slave driver
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2014
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licensor disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "chip.h"
33
34 /*****************************************************************************
35 * Private types/enumerations/variables
36 ****************************************************************************/
37
38 /*****************************************************************************
39 * Public types/enumerations/variables
40 ****************************************************************************/
41
42 /*****************************************************************************
43 * Private functions
44 ****************************************************************************/
45
46 /*****************************************************************************
47 * Public functions
48 ****************************************************************************/
49
50 /* Slave transfer state change handler */
Chip_I2CS_XferHandler(LPC_I2C_T * pI2C,const I2CS_XFER_T * xfers)51 uint32_t Chip_I2CS_XferHandler(LPC_I2C_T *pI2C, const I2CS_XFER_T *xfers)
52 {
53 uint32_t done = 0;
54
55 uint8_t data;
56 uint32_t state;
57
58 /* transfer complete? */
59 if ((Chip_I2C_GetPendingInt(pI2C) & I2C_INTENSET_SLVDESEL) != 0) {
60 Chip_I2CS_ClearStatus(pI2C, I2C_STAT_SLVDESEL);
61 xfers->slaveDone();
62 }
63 else {
64 /* Determine the current I2C slave state */
65 state = Chip_I2CS_GetSlaveState(pI2C);
66
67 switch (state) {
68 case I2C_STAT_SLVCODE_ADDR: /* Slave address received */
69 /* Get slave address that needs servicing */
70 data = Chip_I2CS_GetSlaveAddr(pI2C, Chip_I2CS_GetSlaveMatchIndex(pI2C));
71
72 /* Call address callback */
73 xfers->slaveStart(data);
74 break;
75
76 case I2C_STAT_SLVCODE_RX: /* Data byte received */
77 /* Get received data */
78 data = Chip_I2CS_ReadByte(pI2C);
79 done = xfers->slaveRecv(data);
80 break;
81
82 case I2C_STAT_SLVCODE_TX: /* Get byte that needs to be sent */
83 /* Get data to send */
84 done = xfers->slaveSend(&data);
85 Chip_I2CS_WriteByte(pI2C, data);
86 break;
87 }
88 }
89
90 if (done == 0) {
91 Chip_I2CS_SlaveContinue(pI2C);
92 }
93 else {
94 Chip_I2CS_SlaveNACK(pI2C);
95 }
96
97 return done;
98 }
99