2df4efdf2a
This is just a rough baseline for the higher-level serial handling code and will probably change within the next couple of commits.
82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause */
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/* See the end of this file for copyright, licensing, and warranty information. */
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#include <ardix/ringbuf.h>
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#include <ardix/serial.h>
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#include <arch/serial.h>
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#include <stddef.h>
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int serial_init(struct serial_interface *interface, long int baud)
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{
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int err = -1;
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if (interface->id < 0)
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return -1; /* invalid interface */
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interface->baud = baud;
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interface->rx = ringbuf_create(SERIAL_BUFSZ);
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if (interface->rx == NULL)
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return -1;
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interface->tx = ringbuf_create(SERIAL_BUFSZ);
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if (interface->tx == NULL) {
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ringbuf_destroy(interface->rx);
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return -1;
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}
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err = arch_serial_init(interface);
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if (err) {
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ringbuf_destroy(interface->rx);
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ringbuf_destroy(interface->tx);
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}
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return err;
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}
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void serial_exit(struct serial_interface *interface)
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{
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arch_serial_exit(interface);
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ringbuf_destroy(interface->rx);
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ringbuf_destroy(interface->tx);
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interface->id = -1;
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}
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/* TODO: tell the scheduler to run the I/O thread next after these calls */
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ssize_t serial_read(uint8_t *dest, struct serial_interface *interface, size_t len)
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{
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return (ssize_t)ringbuf_read(dest, interface->rx, len);
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}
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ssize_t serial_write(struct serial_interface *interface, const uint8_t *data, size_t len)
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{
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return (ssize_t)ringbuf_write(interface->tx, data, len);
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}
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/*
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* Copyright (c) 2020 Felix Kopp <sandtler@sandtler.club>
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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