1 /**
2 * \file
3 *
4 * \brief SECURITY_XPLAINED extension board adaptation.
5 *
6 *
7 * Copyright (c) 2011-2015 Atmel Corporation. All rights reserved.
8 *
9 * \asf_license_start
10 *
11 * \page License
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright notice,
17 * this list of conditions and the following disclaimer.
18 *
19 * 2. Redistributions in binary form must reproduce the above copyright notice,
20 * this list of conditions and the following disclaimer in the documentation
21 * and/or other materials provided with the distribution.
22 *
23 * 3. The name of Atmel may not be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * 4. This software may only be redistributed and used in connection with an
27 * Atmel microcontroller product.
28 *
29 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
30 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
31 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
32 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
33 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
38 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
39 * POSSIBILITY OF SUCH DAMAGE.
40 *
41 * \asf_license_stop
42 *
43 */
44 /*
45 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
46 */
47
48
49 #include "security_xplained.h"
50 #include "sha204_physical.h"
51 #include "conf_atsha204.h"
52
53
54 //! TWI address used at SHA204 library startup
55 #define SHA204_I2C_DEFAULT_ADDRESS (0xCA)
56
57
58 /** \brief This function initializes peripherals needed to communicate with
59 * the I2C security devices (ATSHA204 and ATAES132).
60 */
security_board_init(void)61 void security_board_init(void)
62 {
63 sha204p_init();
64 }
65
66
67 /** \brief This function returns the I2C address of a chosen SHA204 device.
68 * \param[in] index the selected device on the Security Xplained board
69 * \return I2C address of chosen device
70 */
sha204_i2c_address(uint8_t index)71 uint8_t sha204_i2c_address(uint8_t index)
72 {
73 static uint8_t i2c_addresses[SHA204_DEVICE_COUNT] = {SHA204_I2C_DEFAULT_ADDRESS, 0xCC, 0xCE, 0xF8};
74 return i2c_addresses[index % SHA204_DEVICE_COUNT];
75 }
76
77