100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/*
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* This file is part of the MicroPython 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) 2021 Damien P. George
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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/runtime.h"
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#include "py/mphal.h"
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#include "usb.h"
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#if CONFIG_USB_ENABLED
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#include "tinyusb.h"
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#include "tusb_cdc_acm.h"
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#define CDC_ITF TINYUSB_CDC_ACM_0
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static uint8_t usb_rx_buf[CONFIG_USB_CDC_RX_BUFSIZE];
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static uint8_t usb_cdc_connected;
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static void usb_callback_rx(int itf, cdcacm_event_t *event) {
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// TODO: what happens if more chars come in during this function, are they lost?
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for (;;) {
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size_t len = 0;
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esp_err_t ret = tinyusb_cdcacm_read(itf, usb_rx_buf, sizeof(usb_rx_buf), &len);
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if (ret != ESP_OK) {
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break;
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}
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if (len == 0) {
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break;
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}
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for (size_t i = 0; i < len; ++i) {
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if (usb_rx_buf[i] == mp_interrupt_char) {
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mp_sched_keyboard_interrupt();
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} else {
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ringbuf_put(&stdin_ringbuf, usb_rx_buf[i]);
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}
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}
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}
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}
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void usb_callback_line_state_changed(int itf, cdcacm_event_t *event) {
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int dtr = event->line_state_changed_data.dtr;
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int rts = event->line_state_changed_data.rts;
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// If dtr && rts are both true, the CDC is connected to a HOST.
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usb_cdc_connected = dtr && rts;
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}
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void usb_init(void) {
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// Initialise the USB with defaults.
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tinyusb_config_t tusb_cfg = {0};
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ESP_ERROR_CHECK(tinyusb_driver_install(&tusb_cfg));
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// Initialise the USB serial interface.
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tinyusb_config_cdcacm_t amc_cfg = {
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.usb_dev = TINYUSB_USBDEV_0,
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.cdc_port = CDC_ITF,
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.rx_unread_buf_sz = 256,
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.callback_rx = &usb_callback_rx,
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.callback_rx_wanted_char = NULL,
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.callback_line_state_changed = &usb_callback_line_state_changed,
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.callback_line_coding_changed = NULL
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};
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usb_cdc_connected = 0;
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ESP_ERROR_CHECK(tusb_cdc_acm_init(&amc_cfg));
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}
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void usb_tx_strn(const char *str, size_t len) {
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// Write out the data to the CDC interface, but only while the USB host is connected.
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while (usb_cdc_connected && len) {
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size_t l = tinyusb_cdcacm_write_queue(CDC_ITF, (uint8_t *)str, len);
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str += l;
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len -= l;
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tud_cdc_n_write_flush(CDC_ITF);
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}
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}
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#endif // CONFIG_USB_ENABLED
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