1 /*!
2 * \file i2c.c
3 *
4 * \brief I2C driver implementation
5 *
6 * \copyright Revised BSD License, see section \ref LICENSE.
7 *
8 * \code
9 * ______ _
10 * / _____) _ | |
11 * ( (____ _____ ____ _| |_ _____ ____| |__
12 * \____ \| ___ | (_ _) ___ |/ ___) _ \
13 * _____) ) ____| | | || |_| ____( (___| | | |
14 * (______/|_____)_|_|_| \__)_____)\____)_| |_|
15 * (C)2013-2017 Semtech
16 *
17 * \endcode
18 *
19 * \author Miguel Luis ( Semtech )
20 *
21 * \author Gregory Cristian ( Semtech )
22 */
23 #include <stdbool.h>
24 #include "utilities.h"
25 #include "i2c-board.h"
26
27 /*!
28 * Flag to indicates if the I2C is initialized
29 */
30 static bool I2cInitialized = false;
31
I2cInit(I2c_t * obj,I2cId_t i2cId,PinNames scl,PinNames sda)32 void I2cInit( I2c_t *obj, I2cId_t i2cId, PinNames scl, PinNames sda )
33 {
34 if( I2cInitialized == false )
35 {
36 I2cInitialized = true;
37
38 I2cMcuInit( obj, i2cId, scl, sda );
39 I2cMcuFormat( obj, MODE_I2C, I2C_DUTY_CYCLE_2, true, I2C_ACK_ADD_7_BIT, 400000 );
40 }
41 }
42
I2cDeInit(I2c_t * obj)43 void I2cDeInit( I2c_t *obj )
44 {
45 I2cInitialized = false;
46 I2cMcuDeInit( obj );
47 }
48
I2cResetBus(I2c_t * obj)49 void I2cResetBus( I2c_t *obj )
50 {
51 I2cMcuResetBus( obj );
52 }
53
I2cWrite(I2c_t * obj,uint8_t deviceAddr,uint8_t data)54 LmnStatus_t I2cWrite( I2c_t *obj, uint8_t deviceAddr, uint8_t data )
55 {
56 if( I2cInitialized == true )
57 {
58 if( I2cMcuWriteBuffer( obj, deviceAddr, &data, 1 ) == LMN_STATUS_ERROR )
59 {
60 // if first attempt fails due to an IRQ, try a second time
61 if( I2cMcuWriteBuffer( obj, deviceAddr, &data, 1 ) == LMN_STATUS_ERROR )
62 {
63 return LMN_STATUS_ERROR;
64 }
65 else
66 {
67 return LMN_STATUS_OK;
68 }
69 }
70 else
71 {
72 return LMN_STATUS_OK;
73 }
74 }
75 else
76 {
77 return LMN_STATUS_ERROR;
78 }
79 }
80
I2cWriteBuffer(I2c_t * obj,uint8_t deviceAddr,uint8_t * buffer,uint16_t size)81 LmnStatus_t I2cWriteBuffer( I2c_t *obj, uint8_t deviceAddr, uint8_t *buffer, uint16_t size )
82 {
83 if( I2cInitialized == true )
84 {
85 if( I2cMcuWriteBuffer( obj, deviceAddr, buffer, size ) == LMN_STATUS_ERROR )
86 {
87 // if first attempt fails due to an IRQ, try a second time
88 if( I2cMcuWriteBuffer( obj, deviceAddr, buffer, size ) == LMN_STATUS_ERROR )
89 {
90 return LMN_STATUS_ERROR;
91 }
92 else
93 {
94 return LMN_STATUS_OK;
95 }
96 }
97 else
98 {
99 return LMN_STATUS_OK;
100 }
101 }
102 else
103 {
104 return LMN_STATUS_ERROR;
105 }
106 }
107
I2cWriteMem(I2c_t * obj,uint8_t deviceAddr,uint16_t addr,uint8_t data)108 LmnStatus_t I2cWriteMem( I2c_t *obj, uint8_t deviceAddr, uint16_t addr, uint8_t data )
109 {
110 if( I2cInitialized == true )
111 {
112 if( I2cMcuWriteMemBuffer( obj, deviceAddr, addr, &data, 1 ) == LMN_STATUS_ERROR )
113 {
114 // if first attempt fails due to an IRQ, try a second time
115 if( I2cMcuWriteMemBuffer( obj, deviceAddr, addr, &data, 1 ) == LMN_STATUS_ERROR )
116 {
117 return LMN_STATUS_ERROR;
118 }
119 else
120 {
121 return LMN_STATUS_OK;
122 }
123 }
124 else
125 {
126 return LMN_STATUS_OK;
127 }
128 }
129 else
130 {
131 return LMN_STATUS_ERROR;
132 }
133 }
134
I2cWriteMemBuffer(I2c_t * obj,uint8_t deviceAddr,uint16_t addr,uint8_t * buffer,uint16_t size)135 LmnStatus_t I2cWriteMemBuffer( I2c_t *obj, uint8_t deviceAddr, uint16_t addr, uint8_t *buffer, uint16_t size )
136 {
137 if( I2cInitialized == true )
138 {
139 if( I2cMcuWriteMemBuffer( obj, deviceAddr, addr, buffer, size ) == LMN_STATUS_ERROR )
140 {
141 // if first attempt fails due to an IRQ, try a second time
142 if( I2cMcuWriteMemBuffer( obj, deviceAddr, addr, buffer, size ) == LMN_STATUS_ERROR )
143 {
144 return LMN_STATUS_ERROR;
145 }
146 else
147 {
148 return LMN_STATUS_OK;
149 }
150 }
151 else
152 {
153 return LMN_STATUS_OK;
154 }
155 }
156 else
157 {
158 return LMN_STATUS_ERROR;
159 }
160 }
161
I2cRead(I2c_t * obj,uint8_t deviceAddr,uint8_t * data)162 LmnStatus_t I2cRead( I2c_t *obj, uint8_t deviceAddr, uint8_t *data )
163 {
164 if( I2cInitialized == true )
165 {
166 return( I2cMcuReadBuffer( obj, deviceAddr, data, 1 ) );
167 }
168 else
169 {
170 return LMN_STATUS_ERROR;
171 }
172 }
173
I2cReadBuffer(I2c_t * obj,uint8_t deviceAddr,uint8_t * buffer,uint16_t size)174 LmnStatus_t I2cReadBuffer( I2c_t *obj, uint8_t deviceAddr, uint8_t *buffer, uint16_t size )
175 {
176 if( I2cInitialized == true )
177 {
178 return( I2cMcuReadBuffer( obj, deviceAddr, buffer, size ) );
179 }
180 else
181 {
182 return LMN_STATUS_ERROR;
183 }
184 }
185
I2cReadMem(I2c_t * obj,uint8_t deviceAddr,uint16_t addr,uint8_t * data)186 LmnStatus_t I2cReadMem( I2c_t *obj, uint8_t deviceAddr, uint16_t addr, uint8_t *data )
187 {
188 if( I2cInitialized == true )
189 {
190 return( I2cMcuReadMemBuffer( obj, deviceAddr, addr, data, 1 ) );
191 }
192 else
193 {
194 return LMN_STATUS_ERROR;
195 }
196 }
197
I2cReadMemBuffer(I2c_t * obj,uint8_t deviceAddr,uint16_t addr,uint8_t * buffer,uint16_t size)198 LmnStatus_t I2cReadMemBuffer( I2c_t *obj, uint8_t deviceAddr, uint16_t addr, uint8_t *buffer, uint16_t size )
199 {
200 if( I2cInitialized == true )
201 {
202 return( I2cMcuReadMemBuffer( obj, deviceAddr, addr, buffer, size ) );
203 }
204 else
205 {
206 return LMN_STATUS_ERROR;
207 }
208 }
209
