micropython/ports/esp32/usb.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Damien P. George
*
* 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 "usb.h"
#if CONFIG_USB_ENABLED
#include "tinyusb.h"
#include "tusb_cdc_acm.h"
#define CDC_ITF TINYUSB_CDC_ACM_0
static uint8_t usb_rx_buf[CONFIG_USB_CDC_RX_BUFSIZE];
static uint8_t usb_cdc_connected;
static void usb_callback_rx(int itf, cdcacm_event_t *event) {
// TODO: what happens if more chars come in during this function, are they lost?
for (;;) {
size_t len = 0;
esp_err_t ret = tinyusb_cdcacm_read(itf, usb_rx_buf, sizeof(usb_rx_buf), &len);
if (ret != ESP_OK) {
break;
}
if (len == 0) {
break;
}
for (size_t i = 0; i < len; ++i) {
if (usb_rx_buf[i] == mp_interrupt_char) {
mp_sched_keyboard_interrupt();
} else {
ringbuf_put(&stdin_ringbuf, usb_rx_buf[i]);
}
}
}
}
void usb_callback_line_state_changed(int itf, cdcacm_event_t *event) {
int dtr = event->line_state_changed_data.dtr;
int rts = event->line_state_changed_data.rts;
// If dtr && rts are both true, the CDC is connected to a HOST.
usb_cdc_connected = dtr && rts;
}
void usb_init(void) {
// Initialise the USB with defaults.
tinyusb_config_t tusb_cfg = {0};
ESP_ERROR_CHECK(tinyusb_driver_install(&tusb_cfg));
// Initialise the USB serial interface.
tinyusb_config_cdcacm_t amc_cfg = {
.usb_dev = TINYUSB_USBDEV_0,
.cdc_port = CDC_ITF,
.rx_unread_buf_sz = 256,
.callback_rx = &usb_callback_rx,
.callback_rx_wanted_char = NULL,
.callback_line_state_changed = &usb_callback_line_state_changed,
.callback_line_coding_changed = NULL
};
usb_cdc_connected = 0;
ESP_ERROR_CHECK(tusb_cdc_acm_init(&amc_cfg));
}
void usb_tx_strn(const char *str, size_t len) {
// Write out the data to the CDC interface, but only while the USB host is connected.
uint64_t timeout = esp_timer_get_time() + (uint64_t)(MICROPY_HW_USB_CDC_TX_TIMEOUT * 1000);
while (usb_cdc_connected && len && esp_timer_get_time() < timeout) {
size_t l = tinyusb_cdcacm_write_queue(CDC_ITF, (uint8_t *)str, len);
str += l;
len -= l;
tud_cdc_n_write_flush(CDC_ITF);
}
}
#endif // CONFIG_USB_ENABLED