--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lcdtest/testmain.c	Sun May 27 21:36:07 2018 +0000
@@ -0,0 +1,66 @@
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <ftdi.h>
+
+char *device_serial;
+struct ftdi_context ftdi;
+
+process_cmdline(argc, argv)
+	char **argv;
+{
+	int c;
+	extern char *optarg;
+
+	while ((c = getopt(argc, argv, "d:")) != EOF) {
+		switch (c) {
+		case 'd':
+			device_serial = optarg;
+			continue;
+		default:
+			/* error msg already printed */
+			exit(1);
+		}
+	}
+	switch (argc - optind) {
+	case 0:
+		break;
+	case 1:
+		if (chdir(argv[optind]) < 0) {
+			perror(argv[optind]);
+			exit(1);
+		}
+		break;
+	default:
+		fprintf(stderr, "usage: %s [options] [chdir]\n", argv[0]);
+		exit(1);
+	}
+}
+
+main(argc, argv)
+	char **argv;
+{
+	char command[512];
+
+	process_cmdline(argc, argv);
+	ftdi_init(&ftdi);
+	if (ftdi_usb_open_desc(&ftdi, 0x0403, 0x7157, 0, device_serial) < 0) {
+		fprintf(stderr, "FTDI USB open failed: %s\n", ftdi.error_str);
+		exit(1);
+	}
+	if (ftdi_set_bitmode(&ftdi, 0, BITMODE_MCU) < 0) {
+		fprintf(stderr, "unable to enter MCU mode: %s\n",
+			ftdi.error_str);
+		exit(1);
+	}
+	for (;;) {
+		if (isatty(0)) {
+			fputs("lcdtest> ", stdout);
+			fflush(stdout);
+		}
+		if (!fgets(command, sizeof command, stdin))
+			exit(0);
+		dispatch_cmd(command);
+	}
+}