mirror of
https://github.com/RIOT-OS/RIOT.git
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54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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/*
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* Copyright (C) 2020 Benjamin Valentin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_edbg_eui
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*
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* @{
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* @file
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* @brief Driver for getting a unique ID from the Atmel Embedded Debugger.
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*
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* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
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*
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* @}
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*/
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#include "edbg_eui.h"
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#include "periph/i2c.h"
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#include "net/l2util.h"
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#ifndef EDBG_I2C_DEV
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#define EDBG_I2C_DEV I2C_DEV(0)
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#endif
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#define EDBG_ADDR (0x28)
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#define TOKEN_EUI64 (0xD2)
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#define TOKEN_EXT (0xE1)
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int edbg_get_eui64(eui64_t *addr)
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{
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int res = 0;
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i2c_acquire(EDBG_I2C_DEV);
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/* dummy read for another token - following edbg user manual, section 4.3.1
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* only returns the EUI-64 once, this work-around works reliable though.
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*/
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if ((res = i2c_read_regs(EDBG_I2C_DEV, EDBG_ADDR, TOKEN_EXT, addr, 2, 0))) {
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goto out;
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}
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/* EDBG provides an EUI-64 for the internal radio */
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if ((res = i2c_read_regs(EDBG_I2C_DEV, EDBG_ADDR, TOKEN_EUI64, addr, sizeof(*addr), 0))) {
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goto out;
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}
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out:
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i2c_release(EDBG_I2C_DEV);
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return res;
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}
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