micropython/shared/tinyusb/mp_cdc_common.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2022 Ibrahim Abdelkader <iabdalkader@openmv.io>
 *
 * 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 "py/runtime.h"
#include "py/mphal.h"
#include "extmod/modmachine.h"

#if MICROPY_HW_USB_CDC_1200BPS_TOUCH && MICROPY_HW_ENABLE_USBDEV

#include "tusb.h"

static mp_sched_node_t mp_bootloader_sched_node;

STATIC void usbd_cdc_run_bootloader_task(mp_sched_node_t *node) {
    mp_hal_delay_ms(250);
    machine_bootloader(0, NULL);
}

void
#if MICROPY_HW_USB_EXTERNAL_TINYUSB
mp_usbd_line_state_cb
#else
tud_cdc_line_state_cb
#endif
    (uint8_t itf, bool dtr, bool rts) {
    if (dtr == false && rts == false) {
        // Device is disconnected.
        cdc_line_coding_t line_coding;
        tud_cdc_n_get_line_coding(itf, &line_coding);
        if (line_coding.bit_rate == 1200) {
            // Delay bootloader jump to allow the USB stack to service endpoints.
            mp_sched_schedule_node(&mp_bootloader_sched_node, usbd_cdc_run_bootloader_task);
        }
    }
}

#endif