From 5be0b56aa1668f35a7e142fce7bdb6d6f2508f94 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Wed, 16 Jan 2013 12:07:27 -0300
Subject: [PATCH] swuart-chat/chat.c: options -r and -t to select pins; bit
 rate argument

---
 swuart-chat/chat.c | 65 +++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 62 insertions(+), 3 deletions(-)

diff --git a/swuart-chat/chat.c b/swuart-chat/chat.c
index b48bc62..ba2b6e6 100644
--- a/swuart-chat/chat.c
+++ b/swuart-chat/chat.c
@@ -16,6 +16,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <string.h>
+#include <strings.h>
 #include <termios.h>
 #include <fcntl.h>
 #include <errno.h>
@@ -24,8 +25,10 @@
 #include <ubb/swuart.h>
 
 
-#define	RX	UBB_DAT0
-#define	TX	UBB_DAT1
+#define	DEFAULT_RX	UBB_DAT0
+#define	DEFAULT_TX	UBB_DAT1
+
+#define	DEFAULT_BPS	38400
 
 
 /* ----- TTY raw mode ------------------------------------------------------ */
@@ -69,10 +72,66 @@ static void at_exit(void)
 }
 
 
+static uint32_t translate(const char *s)
+{
+	if (!strcasecmp(s, "DAT0"))
+		return UBB_DAT0;
+	if (!strcasecmp(s, "DAT1"))
+		return UBB_DAT1;
+	if (!strcasecmp(s, "DAT2"))
+		return UBB_DAT2;
+	if (!strcasecmp(s, "DAT3"))
+		return UBB_DAT3;
+	if (!strcasecmp(s, "CMD"))
+		return UBB_CMD;
+	if (!strcasecmp(s, "CLK"))
+		return UBB_CLK;
+	if (!strcasecmp(s, "NONE"))
+		return 0;
+	fprintf(stderr, "unknown pin \"%s\"\n", s);
+	exit(1);
+}
+
+
+static void usage(const char *name)
+{
+	fprintf(stderr, "usage: %s [-r rx_pin] [-t tx_pin] [bps]\n", name);
+	exit(1);
+}
+
+
 int main(int argc, char **argv)
 {
+	uint32_t rx = DEFAULT_RX;
+	uint32_t tx = DEFAULT_TX;
+	int bps = DEFAULT_BPS;
 	uint8_t local[10], remote[100];
 	int got, i;
+	int c;
+
+	while ((c = getopt(argc, argv, "r:t:")) != EOF)
+		switch (c) {
+		case 'r':
+			rx = translate(optarg);
+			break;
+		case 't':
+			tx = translate(optarg);
+			break;
+		default:
+			usage(*argv);
+		}
+
+	switch (argc-optind) {
+	case 0:
+		break;
+	case 1:
+		bps = atoi(argv[optind]);
+		if (!bps)
+			usage(*argv);
+		break;
+	default:
+		usage(*argv);
+	}
 
 	if (ubb_open(0) < 0) {
 		perror("ubb_open");
@@ -80,7 +139,7 @@ int main(int argc, char **argv)
 	}
 	atexit(at_exit);
 	raw();
-	if (swuart_open(TX, RX, 38400) < 0) {
+	if (swuart_open(tx, rx, bps) < 0) {
 		perror("swuart_open");
 		exit(1);
 	}