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circuitpython/supervisor/shared/usb/usb.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2018 hathach 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 "tick.h"
#include "shared-bindings/microcontroller/Processor.h"
#include "shared-module/usb_midi/__init__.h"
#include "supervisor/port.h"
#include "supervisor/usb.h"
#include "lib/utils/interrupt_char.h"
#include "lib/mp-readline/readline.h"
#include "tusb.h"
// Serial number as hex characters. This writes directly to the USB
// descriptor.
extern uint16_t usb_serial_number[1 + COMMON_HAL_MCU_PROCESSOR_UID_LENGTH * 2];
void load_serial_number(void) {
// create serial number based on device unique id
uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH];
common_hal_mcu_processor_get_uid(raw_id);
static const char nibble_to_hex[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'};
for (int i = 0; i < COMMON_HAL_MCU_PROCESSOR_UID_LENGTH; i++) {
for (int j = 0; j < 2; j++) {
uint8_t nibble = (raw_id[i] >> (j * 4)) & 0xf;
// Strings are UTF-16-LE encoded.
usb_serial_number[1 + i * 2 + j] = nibble_to_hex[nibble];
}
}
}
bool usb_enabled(void) {
return tusb_inited();
}
void usb_init(void) {
init_usb_hardware();
load_serial_number();
tusb_init();
#if MICROPY_KBD_EXCEPTION
// Set Ctrl+C as wanted char, tud_cdc_rx_wanted_cb() callback will be invoked when Ctrl+C is received
// This callback always got invoked regardless of mp_interrupt_char value since we only set it once here
tud_cdc_set_wanted_char(CHAR_CTRL_C);
#endif
#if CIRCUITPY_USB_MIDI
usb_midi_init();
#endif
}
void usb_background(void) {
if (usb_enabled()) {
tud_task();
tud_cdc_write_flush();
}
}
//--------------------------------------------------------------------+
// tinyusb callbacks
//--------------------------------------------------------------------+
// Invoked when device is mounted
void tud_mount_cb(void) {
}
// Invoked when device is unmounted
void tud_umount_cb(void) {
}
// Invoked when usb bus is suspended
// remote_wakeup_en : if host allows us to perform remote wakeup
// USB Specs: Within 7ms, device must draw an average current less than 2.5 mA from bus
void tud_suspend_cb(bool remote_wakeup_en) {
}
// Invoked when usb bus is resumed
void tud_resume_cb(void) {
}
// Invoked when cdc when line state changed e.g connected/disconnected
// Use to reset to DFU when disconnect with 1200 bps
void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {
(void) itf; // interface ID, not used
// DTR = false is counted as disconnected
if ( !dtr )
{
cdc_line_coding_t coding;
tud_cdc_get_line_coding(&coding);
if ( coding.bit_rate == 1200 )
{
reset_to_bootloader();
}
}
}
#if MICROPY_KBD_EXCEPTION
/**
* Callback invoked when received an "wanted" char.
* @param itf Interface index (for multiple cdc interfaces)
* @param wanted_char The wanted char (set previously)
*/
void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char)
{
(void) itf; // not used
// Workaround for using lib/utils/interrupt_char.c
// Compare mp_interrupt_char with wanted_char and ignore if not matched
if (mp_interrupt_char == wanted_char) {
tud_cdc_read_flush(); // flush read fifo
mp_keyboard_interrupt();
}
}
#endif