circuitpython/ports/atmel-samd/supervisor/serial.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "supervisor/serial.h"
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#include "common-hal/usb_hid/Device.h"
#include "usb.h"
#include "genhdr/autogen_usb_descriptor.h"
// Serial number as hex characters. This writes directly to the USB
// descriptor.
void load_serial_number(void) {
char nibble_to_hex[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'};
#ifdef SAMD21
uint32_t* addresses[4] = {(uint32_t *) 0x0080A00C, (uint32_t *) 0x0080A040,
(uint32_t *) 0x0080A044, (uint32_t *) 0x0080A048};
#endif
#ifdef SAMD51
uint32_t* addresses[4] = {(uint32_t *) 0x008061FC, (uint32_t *) 0x00806010,
(uint32_t *) 0x00806014, (uint32_t *) 0x00806018};
#endif
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 8; j++) {
uint8_t nibble = (*(addresses[i]) >> j * 4) & 0xf;
// Strings are UTF-16-LE encoded.
serial_number[i * 16 + j * 2] = nibble_to_hex[nibble];
serial_number[i * 16 + j * 2 + 1] = 0;
}
}
}
void serial_init(void) {
load_serial_number();
init_usb();
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usb_hid_init();
}
bool serial_connected(void) {
return usb_connected();
}
char serial_read(void) {
return usb_read();
}
bool serial_bytes_available(void) {
return usb_bytes_available();
}
void serial_write(const char* text) {
usb_write(text, strlen(text));
}