89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 Karl Palsson <karlp@ŧweak.net.au>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/desig.h>
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uint16_t desig_get_flash_size(void)
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{
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return DESIG_FLASH_SIZE;
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}
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void desig_get_unique_id(uint32_t *result)
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{
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*result++ = DESIG_UNIQUE_ID2;
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*result++ = DESIG_UNIQUE_ID1;
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*result = DESIG_UNIQUE_ID0;
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}
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void desig_get_unique_id_as_string(char *string,
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unsigned int string_len)
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{
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int i, len;
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uint32_t dev_id_buf[3];
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uint8_t *device_id = (uint8_t *)dev_id_buf;
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const char chars[] = "0123456789ABCDEF";
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desig_get_unique_id(dev_id_buf);
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/* Each byte produces two characters */
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len = (2 * sizeof(dev_id_buf) < string_len) ?
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2 * sizeof(dev_id_buf) : string_len - 1;
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for (i = 0; i < len; i += 2) {
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string[i] = chars[(device_id[i / 2] >> 4) & 0x0F];
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string[i + 1] = chars[(device_id[i / 2] >> 0) & 0x0F];
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}
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string[len] = '\0';
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}
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/**
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* Generate a serial number from the unique id registers as the DFU bootloader.
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* This document: http://www.usb.org/developers/docs/devclass_docs/usbmassbulk_10.pdf
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* says that the serial number has to be at least 12 digits long and that
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* the last 12 digits need to be unique. It also stipulates that the valid
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* character set is that of upper-case hexadecimal digits.
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* The onboard DFU bootloader produces a 12-digit serial based on the
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* 96-bit unique ID. Show the serial with ```dfu-util -l``` while the
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* MCU is in DFU mode.
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* @see https://my.st.com/52d187b7 for the algorithim used.
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* @param string pointer to store serial in, must be at least 13 bytes
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*/
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void desig_get_unique_id_as_dfu(char *string) {
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uint8_t *id = (uint8_t *)DESIG_UNIQUE_ID_BASE;
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uint8_t serial[6];
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serial[0] = id[11];
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serial[1] = id[10] + id[2];
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serial[2] = id[9];
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serial[3] = id[8] + id[0];
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serial[4] = id[7];
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serial[5] = id[6];
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uint8_t *ser = &serial[0];
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uint8_t *end = &serial[6];
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const char hex_digit[] = "0123456789ABCDEF";
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for (; ser < end; ser++) {
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*string++ = hex_digit[(*ser >> 4) & 0x0f];
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*string++ = hex_digit[(*ser >> 0) & 0x0f];
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}
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*string = '\0';
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}
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