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/*
* The MIT License (MIT)
*
* Copyright (c) 2022, Ha Thach (tinyusb.org)
*
* 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.
*
* This file is part of the TinyUSB stack.
*/
#include "tusb.h"
#include "bsp/board_api.h"
#include "app.h"
static size_t console_read(uint8_t *buf, size_t bufsize) {
size_t count = 0;
while (count < bufsize) {
const int ch = board_getchar();
if (ch < 0) {
break;
}
buf[count] = (uint8_t) ch;
count++;
}
return count;
}
// Give up forwarding to the console after this long without progress. Not every board's
// board_uart_write() reports "no console here" the same way, so the loop below cannot rely
// on the return value alone to know when to stop.
enum { CONSOLE_STALL_MS = 10 };
// Returns bytes written, 0 if the console cannot take them right now, negative if this
// board has no console at all.
static int console_write(const uint8_t *buf, size_t bufsize) {
#if defined(LOGGER_RTT)
// The console is the debug probe, not a UART: board_uart_write() is a stub on those
// boards. NO_BLOCK_SKIP writes all or nothing, so 0 means the probe has not drained the
// up-buffer yet.
return (int) SEGGER_RTT_Write(0, buf, (unsigned) bufsize);
#else
// Use board_uart_write directly for non-blocking behavior.
// board_putchar -> sys_write has a blocking retry loop that causes UART RX overrun.
return board_uart_write(buf, (int) bufsize);
#endif
}
// forward from console to usbh
static void console_to_usbh(uint8_t idx) {
uint8_t buf[64];
size_t count = console_read(buf, sizeof(buf));
if (count > 0) {
tuh_cdc_write(idx, buf, count);
}
}
void cdc_app_task(void) {
const uint8_t idx = 0;
// Bidirectional forwarding: console <-> host cdc interfaces
if (!tuh_cdc_mounted(idx)) {
return;
}
// usbh -> uart
uint8_t buf[64];
uint32_t count = tuh_cdc_read(idx, buf, sizeof(buf));
uint32_t wr = 0;
uint32_t progress_ms = tusb_time_millis_api();
do {
// console write is slow, while waiting forward console -> usbh else its rx can overflow
if (count) {
const int written = console_write(buf + wr, count - wr);
if (written < 0) {
break; // no console on this board at all
}
if (written > 0) {
wr += (uint32_t) written;
progress_ms = tusb_time_millis_api();
} else if (tusb_time_millis_api() - progress_ms > CONSOLE_STALL_MS) {
// a TX FIFO or an RTT up-buffer is only ever transiently full: nothing draining it
// must not stall the host task, so drop the rest
break;
}
}
console_to_usbh(idx);
} while (wr < count);
tuh_cdc_write_flush(idx);
}
//--------------------------------------------------------------------+
// TinyUSB callbacks
//--------------------------------------------------------------------+
// Invoked when a device with CDC interface is mounted
// idx is index of cdc interface in the internal pool.
void tuh_cdc_mount_cb(uint8_t idx) {
tuh_itf_info_t itf_info = {0};
tuh_cdc_itf_get_info(idx, &itf_info);
printf("CDC Interface is mounted: address = %u, itf_num = %u\r\n", itf_info.daddr,
itf_info.desc.bInterfaceNumber);
// If CFG_TUH_CDC_LINE_CODING_ON_ENUM is defined, line coding will be set by tinyusb stack
// while eneumerating new cdc device
cdc_line_coding_t line_coding = {0};
if (tuh_cdc_get_line_coding_local(idx, &line_coding)) {
printf(" Baudrate: %" PRIu32 ", Stop Bits : %u\r\n", line_coding.bit_rate, line_coding.stop_bits);
printf(" Parity : %u, Data Width: %u\r\n", line_coding.parity, line_coding.data_bits);
}
}
// Invoked when a device with CDC interface is unmounted
void tuh_cdc_umount_cb(uint8_t idx) {
tuh_itf_info_t itf_info = {0};
tuh_cdc_itf_get_info(idx, &itf_info);
printf("CDC Interface is unmounted: address = %u, itf_num = %u\r\n", itf_info.daddr,
itf_info.desc.bInterfaceNumber);
}
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