From 3bf04dad5423e69499442b40d393c6f3f087409c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anton=20Luka=20=C5=A0ijanec?= <anton@sijanec.eu>
Date: Sat, 29 Oct 2022 16:20:59 +0200
Subject: dmx2artnet

---
 sw/dmx2artnet/settty.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 sw/dmx2artnet/settty.c

(limited to 'sw/dmx2artnet/settty.c')

diff --git a/sw/dmx2artnet/settty.c b/sw/dmx2artnet/settty.c
new file mode 100644
index 0000000..65f54b1
--- /dev/null
+++ b/sw/dmx2artnet/settty.c
@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <poll.h>
+#include <sys/types.h>
+#include <error.h>
+#include <fcntl.h>
+#include <sys/sendfile.h>
+#define termios asmtermios
+#define winsize asmwinsize
+#define termio asmtermio
+#include <asm/termios.h>
+#undef termios
+#undef winsize
+#undef termio
+#define S0(x) (x ? x : "")
+// start bit: low, 2 stop bits high
+int rate (int what_rate, int uart) {
+	int r = 0;
+	struct termios2 uartattr2;
+	if (ioctl(uart, TCGETS2, &uartattr2) == -1) {
+		error_at_line(0, errno, __FILE__, __LINE__, "ioctl TCGETS2, fd: %d", uart);
+		r = 1;
+		goto r;
+	}
+	uartattr2.c_cflag &= ~CBAUD;
+	uartattr2.c_cflag |= BOTHER;
+	uartattr2.c_ispeed = what_rate;
+	uartattr2.c_ospeed = what_rate;
+	if (ioctl(uart, TCSETS2, &uartattr2) == -1) {
+		error_at_line(0, errno, __FILE__, __LINE__, "ioctl TCSETS2");
+		r = 2;
+		goto r;
+	}
+r:
+	return r;
+}
+int main (int argc, char ** argv) {
+	int r = 0;
+	if (argc != 1+1)
+		error_at_line(1, 0, __FILE__, __LINE__, "usage: %s /dev/ttyUSB0", S0(argv[0]));
+	int uart = open(argv[1], O_WRONLY | O_NOCTTY | O_NDELAY | O_CLOEXEC);
+	if (uart == -1)
+		error_at_line(3, errno, __FILE__, __LINE__, "open");
+	struct termios uartattr;
+	if (tcgetattr(uart, &uartattr) == -1) {
+		error_at_line(0, errno, __FILE__, __LINE__, "tcgetattr");
+		r = 4;
+		goto r;
+	}
+	uartattr.c_iflag = 0;
+	uartattr.c_oflag = 0;
+	uartattr.c_cflag = CS8 | CSTOPB;
+	uartattr.c_lflag = 0;
+	if (tcflush(uart, TCIOFLUSH) == -1) {
+		error_at_line(0, errno, __FILE__, __LINE__, "tcflush");
+		r = 5;
+		goto r;
+	}
+	if (tcsetattr(uart, TCSANOW, &uartattr) == -1) {
+		error_at_line(0, errno, __FILE__, __LINE__, "tcsetattr");
+		r = 6;
+		goto r;
+	}
+	if (tcflush(uart, TCIOFLUSH) == -1) {
+		error_at_line(0, errno, __FILE__, __LINE__, "tcflush");
+		r = 15;
+		goto r;
+	}
+	switch (rate(250000, uart)) {
+		case 1:
+			r = 20;
+			goto r;
+			break;
+		case 2:
+			r = 21;
+			goto r;
+			break;
+		default:
+			break;
+	}
+r:
+	if (close(uart) == -1)
+		error_at_line(22, errno, __FILE__, __LINE__, "close(uart)");
+	return r;
+}
-- 
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