mirror of
https://github.com/rkujawa/rk65c02.git
synced 2024-06-15 05:29:28 +00:00
144 lines
3.1 KiB
C
144 lines
3.1 KiB
C
/*
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* SPDX-License-Identifier: GPL-3.0-only
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*
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* rk65c02
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* Copyright (C) 2017-2019 Radoslaw Kujawa
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <gc/gc.h>
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#include "bus.h"
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#include "device.h"
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const static char *txpipepath = "/tmp/rk65c02_serial_tx"; /* should really be configurable */
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const static char *rxpipepath = "/tmp/rk65c02_serial_rx"; /* should really be configurable */
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struct device_serial_priv {
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int txpipefd;
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int rxpipefd;
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};
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uint8_t device_serial_read_1(void *, uint16_t);
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void device_serial_write_1(void *, uint16_t, uint8_t);
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void device_serial_finish(void *);
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uint8_t
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device_serial_read_1(void *vd, uint16_t offset)
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{
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device_t *d;
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struct device_serial_priv *dp;
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ssize_t nread;
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uint8_t val;
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d = (device_t *) vd;
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dp = d->aux;
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switch (offset) {
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case 0x1:
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nread = read(dp->rxpipefd, &val, 1);;
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if (nread == 0)
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val = 0xFE;
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if (nread == -1)
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val = 0xFD;
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default:
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break;
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}
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// XXX: TODO
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return 0xFF;
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}
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void
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device_serial_write_1(void *vd, uint16_t offset, uint8_t val)
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{
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device_t *d;
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struct device_serial_priv *dp;
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d = (device_t *) vd;
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dp = d->aux;
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switch (offset) {
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case 0x0:
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/*fprintf(stderr, "writing to fd %d val %x\n", dp->txpipefd, val);*/
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write(dp->txpipefd, &val, 1);
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fsync(dp->txpipefd);
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break;
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default:
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/* do nothing */
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break;
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}
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}
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device_t *
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device_serial_init()
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{
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device_t *d;
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struct device_serial_priv *dp;
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d = (device_t *) GC_MALLOC(sizeof(device_t));
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assert(d != NULL);
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d->name = "Serial";
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d->size = 4;
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d->read_1 = device_serial_read_1;
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d->write_1 = device_serial_write_1;
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d->finish = device_serial_finish;
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dp = (struct device_serial_priv *) GC_MALLOC(sizeof(struct device_serial_priv));
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assert(dp != NULL);
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d->aux = dp;
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if (mkfifo(txpipepath, S_IRUSR | S_IWUSR) != 0) {
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fprintf(stderr, "Creating FIFO for serial port failed!\n");
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/* perror, handle this failure... */
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}
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if (mkfifo(rxpipepath, S_IRUSR | S_IWUSR) != 0) {
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fprintf(stderr, "Creating FIFO for serial port failed!\n");
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/* perror, handle this failure... */
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}
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dp->txpipefd = open(txpipepath, O_WRONLY);
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dp->rxpipefd = open(rxpipepath, O_RDONLY | O_NONBLOCK);
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return d;
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}
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void
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device_serial_finish(void *dv)
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{
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struct device_serial_priv *dp;
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struct device_t *d;
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d = (struct device_t *) dv;
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dp = d->aux;
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close(dp->txpipefd);
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close(dp->rxpipefd);
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unlink(txpipepath);
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unlink(rxpipepath);
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}
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