162 lines
4.8 KiB
C
162 lines
4.8 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 hathach for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/objstr.h"
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#include "shared-bindings/microcontroller/Processor.h"
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#include "shared-module/usb_midi/__init__.h"
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#include "supervisor/background_callback.h"
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#include "supervisor/port.h"
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#include "supervisor/usb.h"
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#include "lib/utils/interrupt_char.h"
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#include "lib/mp-readline/readline.h"
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#include "tusb.h"
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// Serial number as hex characters. This writes directly to the USB
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// descriptor.
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extern uint16_t usb_serial_number[1 + COMMON_HAL_MCU_PROCESSOR_UID_LENGTH * 2];
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void load_serial_number(void) {
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// create serial number based on device unique id
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uint8_t raw_id[COMMON_HAL_MCU_PROCESSOR_UID_LENGTH];
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common_hal_mcu_processor_get_uid(raw_id);
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for (int i = 0; i < COMMON_HAL_MCU_PROCESSOR_UID_LENGTH; i++) {
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for (int j = 0; j < 2; j++) {
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uint8_t nibble = (raw_id[i] >> (j * 4)) & 0xf;
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// Strings are UTF-16-LE encoded.
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usb_serial_number[1 + i * 2 + j] = nibble_to_hex_upper[nibble];
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}
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}
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}
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bool usb_enabled(void) {
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return tusb_inited();
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}
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void usb_init(void) {
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init_usb_hardware();
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load_serial_number();
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tusb_init();
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#if MICROPY_KBD_EXCEPTION
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// Set Ctrl+C as wanted char, tud_cdc_rx_wanted_cb() usb_callback will be invoked when Ctrl+C is received
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// This usb_callback always got invoked regardless of mp_interrupt_char value since we only set it once here
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tud_cdc_set_wanted_char(CHAR_CTRL_C);
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#endif
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#if CIRCUITPY_USB_MIDI
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usb_midi_init();
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#endif
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}
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void usb_disconnect(void) {
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tud_disconnect();
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}
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void usb_background(void) {
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if (usb_enabled()) {
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#if CFG_TUSB_OS == OPT_OS_NONE
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tud_task();
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#endif
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tud_cdc_write_flush();
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}
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}
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static background_callback_t usb_callback;
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static void usb_background_do(void* unused) {
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usb_background();
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}
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void usb_irq_handler(void) {
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tud_int_handler(0);
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background_callback_add(&usb_callback, usb_background_do, NULL);
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}
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//--------------------------------------------------------------------+
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// tinyusb callbacks
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//--------------------------------------------------------------------+
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// Invoked when device is mounted
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void tud_mount_cb(void) {
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usb_msc_mount();
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}
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// Invoked when device is unmounted
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void tud_umount_cb(void) {
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usb_msc_umount();
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}
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// Invoked when usb bus is suspended
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// remote_wakeup_en : if host allows us to perform remote wakeup
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// USB Specs: Within 7ms, device must draw an average current less than 2.5 mA from bus
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void tud_suspend_cb(bool remote_wakeup_en) {
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}
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// Invoked when usb bus is resumed
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void tud_resume_cb(void) {
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}
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// Invoked when cdc when line state changed e.g connected/disconnected
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// Use to reset to DFU when disconnect with 1200 bps
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void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {
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(void) itf; // interface ID, not used
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// DTR = false is counted as disconnected
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if ( !dtr )
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{
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cdc_line_coding_t coding;
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tud_cdc_get_line_coding(&coding);
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if ( coding.bit_rate == 1200 )
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{
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reset_to_bootloader();
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}
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}
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}
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#if MICROPY_KBD_EXCEPTION
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/**
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* Callback invoked when received an "wanted" char.
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* @param itf Interface index (for multiple cdc interfaces)
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* @param wanted_char The wanted char (set previously)
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*/
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void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char)
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{
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(void) itf; // not used
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// Workaround for using lib/utils/interrupt_char.c
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// Compare mp_interrupt_char with wanted_char and ignore if not matched
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if (mp_interrupt_char == wanted_char) {
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tud_cdc_read_flush(); // flush read fifo
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mp_keyboard_interrupt();
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}
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}
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#endif
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