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swuart/: convert "hammering the peer" demo into a primitive interactive chat

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Also rename directory from swuart/ to swuart-chat/, and application from
"swuart" to "chat".
This commit is contained in:
Werner Almesberger 2012-12-17 22:43:21 -03:00
parent 1c51cc6757
commit 519ebe648c
3 changed files with 107 additions and 58 deletions
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4
swuart/Makefile → swuart-chat/Makefile
View File

@ -3,8 +3,8 @@ CFLAGS = -g -Wall -O9 -I../libubb/include
LDFLAGS = -static
LDLIBS = -L../libubb -lubb
MAIN = swuart
OBJS = test.o
MAIN = chat
OBJS = chat.o
.PHONY: all clean spotless

105
swuart-chat/chat.c Normal file
View File

@ -0,0 +1,105 @@
/*
* swuart-chat/chat.c - Simple two-way chat using swuart
*
* Written 2012 by Werner Almesberger
* Copyright 2012 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <termios.h>
#include <fcntl.h>
#include <errno.h>
#include <ubb/ubb.h>
#include <ubb/swuart.h>
#define RX UBB_DAT0
#define TX UBB_DAT1
/* ----- TTY raw mode ------------------------------------------------------ */
static struct termios old_term;
static void raw(void)
{
struct termios term;
if (tcgetattr(0, &old_term) < 0) {
perror("tcgetattr");
exit(1);
}
term = old_term;
cfmakeraw(&term);
if (tcsetattr(0, TCSAFLUSH, &term) < 0) {
perror("tcsetattr");
exit(1);
}
if (fcntl(0, F_SETFL, O_NONBLOCK) < 0) {
perror("fcntl");
exit(1);
}
}
static void restore_term(void)
{
if (tcsetattr(0, TCSAFLUSH, &old_term) < 0)
perror("tcsetattr");
}
static void at_exit(void)
{
restore_term();
swuart_close();
}
int main(int argc, char **argv)
{
uint8_t local[10], remote[100];
int got, i;
raw();
atexit(at_exit);
swuart_open(TX, RX, 38400);
while (1) {
got = read(0, local, sizeof(local));
if (got < 0 && errno == EAGAIN)
got = 0;
if (got < 0) {
perror("read");
exit(1);
}
if (memchr(local, 3, got))
break;
got = swuart_trx(local, got, remote, sizeof(remote),
1000, 100);
for (i = 0; i != got; i++)
if (remote[i] >= ' ' && remote[i] <= '~')
printf("%c", remote[i]);
else if (remote[i] == 13)
printf("\r\n");
else if (remote[i] == 8 || remote[i] == 127)
printf("\b \b");
else
printf("\\%02o", remote[i]);
fflush(stdout);
}
printf("\r\n");
return 0;
}

56
swuart/test.c
View File

@ -1,56 +0,0 @@
/*
* swuart/test.c - Software-implemented UART for UBB
*
* Written 2012 by Werner Almesberger
* Copyright 2012 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <ubb/ubb.h>
#include <ubb/swuart.h>
#define RX UBB_DAT0
#define TX UBB_DAT1
static void at_exit(void)
{
swuart_close();
}
int main(int argc, char **argv)
{
uint8_t buf[40];
struct swuart_err err;
int got, i;
swuart_open(TX, RX, atoi(argv[1]));
atexit(at_exit);
while (1) {
got = swuart_trx(argv[2], strlen(argv[2]), buf, sizeof(buf),
10000, 100);
swuart_get_errors(&err);
printf("%d (%d %d %d): ", got,
err.glitch, err.framing, err.overflow);
for (i = 0; i != got; i++)
if (buf[i] >= ' ' && buf[i] <= '~')
printf("%c", buf[i]);
else
printf("\\%02o", buf[i]);
printf("\n");
usleep(100);
}
}