1 /*
2 *
3 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
4 *
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the
16 * distribution.
17 *
18 * Neither the name of Texas Instruments Incorporated nor the names of
19 * its contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
28 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 *
34 */
38 /****************************************************************************************************
39 * FILE PURPOSE: Read an I2C eeprom
40 ****************************************************************************************************
41 * @file i2cRead.c
42 *
43 * @brief
44 * Reads bytes from an i2c eeprom
45 *
46 ****************************************************************************************************/
48 #include "types.h"
49 #include "i2c.h"
50 #include "target.h"
51 #include <stdio.h>
53 #define I2C_SIZE_BYTES 0x10000
55 /* Run time configuration */
56 unsigned int deviceFreqMhz = 1000;
57 unsigned short busAddress = 0x50;
58 unsigned int nbytes = I2C_SIZE_BYTES;
59 unsigned int firstByte = 0;
62 #pragma DATA_SECTION(i2cData, ".i2cData")
63 unsigned char i2cData[I2C_SIZE_BYTES];
65 /**
66 * @brief
67 * Display the error returned by the i2c driver
68 */
69 void showI2cError (I2C_RET iret)
70 {
71 char *ecode;
73 switch (iret) {
74 case I2C_RET_LOST_ARB: ecode = "I2C master lost an arbitration battle";
75 break;
77 case I2C_RET_NO_ACK: ecode = "I2C master detected no ack from slave";
78 break;
80 case I2C_RET_IDLE_TIMEOUT: ecode = "I2C timed out";
81 break;
83 case I2C_RET_BAD_REQUEST: ecode = "I2C driver detected a bad data request";
84 break;
86 case I2C_RET_CLOCK_STUCK_LOW: ecode = "I2C driver found the bus stuck low";
87 break;
89 case I2C_RET_GEN_ERROR: ecode = "I2C driver reported a general error";
90 break;
92 }
94 printf ("I2C reported error: %s\n", ecode);
96 }
99 void main (void)
100 {
101 I2C_RET i2cRet;
103 hwI2Cinit (deviceFreqMhz,
104 DEVICE_I2C_MODULE_DIVISOR,
105 25, /* Run the bus at 25 kHz */
106 10);
109 i2cRet = hwI2cMasterRead (firstByte,
110 nbytes,
111 i2cData,
112 busAddress,
113 10 );
116 if (i2cRet != I2C_RET_OK)
117 showI2cError (i2cRet);
118 else
119 printf ("I2C read complete\n");
121 }