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102 lines
2.1 KiB
C
102 lines
2.1 KiB
C
/*
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* Copyright (C) 2022 ML!PA Consulting GmbH
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup pkg_tinyusb
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* @{
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*
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* @file
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* @brief CDC ACM stdio implementation for tinyUSB CDC ACM
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*
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* This file implements a USB CDC ACM callback and read/write functions.
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*
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* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
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*
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* @}
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*/
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#define USB_H_USER_IS_RIOT_INTERNAL
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#include <stdio.h>
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#include <sys/types.h>
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#include "tusb.h"
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#include "tinyusb.h"
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#if MODULE_VFS
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#include "vfs.h"
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#endif
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#ifdef MODULE_USB_BOARD_RESET
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#include "usb_board_reset_internal.h"
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#include "class/cdc/cdc.h"
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#endif
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static mutex_t data_lock = MUTEX_INIT_LOCKED;
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void stdio_init(void)
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{
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/* Initialize this side of the CDC ACM pipe */
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#if MODULE_VFS
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vfs_bind_stdio();
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#endif
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}
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#if IS_USED(MODULE_STDIO_AVAILABLE)
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int stdio_available(void)
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{
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return tud_cdc_available();
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}
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#endif
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ssize_t stdio_read(void* buffer, size_t len)
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{
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mutex_lock(&data_lock);
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return tud_cdc_read(buffer, len);
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}
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ssize_t stdio_write(const void* buffer, size_t len)
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{
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const char *start = buffer;
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while (tud_cdc_connected() && len) {
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size_t n = tud_cdc_write(buffer, len);
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buffer = (char *)buffer + n;
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len -= n;
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};
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tud_cdc_write_flush();
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return (char *)buffer - start;
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}
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void tud_cdc_rx_cb(uint8_t itf)
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{
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(void)itf;
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mutex_unlock(&data_lock);
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}
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#ifdef MODULE_USB_BOARD_RESET
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void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* p_line_coding)
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{
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(void)itf;
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assert(p_line_coding != NULL);
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/* The first parameter is the USBUS CDC ACM device, but this is
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* not used in `usb_board_reset_coding_cb`. Therefore we can simply
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* reuse this callback function in tinyUSB without any problems. */
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usb_board_reset_coding_cb(NULL,
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p_line_coding->bit_rate,
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p_line_coding->data_bits,
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p_line_coding->parity,
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p_line_coding->stop_bits);
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}
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#endif
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