tty2midi

commit c5700508eaba3129491e5fa1491d84bab89e931f
Author: prenev <an2qzavok@gmail.com>
Date:   Sun, 12 Sep 2021 00:17:54 +0300

commit all the codes

Diffstat:
A
LICENSE
 | 
13
+++++++++++++
A
Makefile
 | 
31
+++++++++++++++++++++++++++++++
A
README
 | 
3
+++
A
config.mk
 | 
12
++++++++++++
A
tty2midi.c
 | 
86
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

5 files changed, 145 insertions(+), 0 deletions(-)
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,13 @@
+Copyright (c) 2021 Pavel Renev <an2qzavok@gmail.com>
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/Makefile b/Makefile
@@ -0,0 +1,31 @@
+include config.mk
+
+SRC = tty2midi.c
+OBJ = ${SRC:.c=.o}
+
+all: tty2midi
+
+.c.o:
+	${CC} -c ${CFLAGS} $<
+
+${OBJ}:
+
+tty2midi: ${OBJ}
+	${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+install: all
+	mkdir -p ${DESTDIR}${PREFIX}/bin/
+	cp -f pcmprint $(DESTDIR)${PREFIX}/bin/
+	chmod 755 ${DESTDIR}${PREFIX}/bin/pcmprint
+	mkdir -p ${DESTDIR}${MANPREFIX}/man1
+	cp -f pcmprint.1 ${DESTDIR}${MANPREFIX}/man1/pcmprint.1
+	chmod 644 ${DESTDIR}${MANPREFIX}/man1/pcmprint.1
+
+uninstall:
+	rm -f ${DESTDIR}${PREFIX}/bin/pcmprint\
+		${DESTDIR}${MANDIR}/pcmprint.1
+
+clean:
+	rm -f tty2midi ${OBJ}
+
+.PHONY: all clean instal uninstall
diff --git a/README b/README
@@ -0,0 +1,3 @@
+Recieves messages from a serial port and sends them to ALSA MIDI.
+Useful for imlementing musical controllers with something like Arduino.
+Paths and tty config are hard-coded because I couldn't be bothered.
diff --git a/config.mk b/config.mk
@@ -0,0 +1,12 @@
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
+INCS = 
+LIBS = -lasound
+
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_POSIX_C_SOURCE=200809L
+CFLAGS   = -g -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os ${INCS} ${CPPFLAGS}
+LDFLAGS  = ${LIBS}
+
+CC = cc
+
diff --git a/tty2midi.c b/tty2midi.c
@@ -0,0 +1,86 @@
+#include<stdio.h>
+#include<stdlib.h>
+#include<fcntl.h>
+#include<unistd.h>
+#include<termio.h>
+#include<alsa/asoundlib.h>
+
+int
+main(void)
+{
+	int tf, portid;
+	struct termios tty;
+	snd_seq_t *seq;
+	snd_seq_event_t ev;
+	snd_midi_event_t *midi;
+
+	/* serial setup */
+	tf = open("/dev/ttyACM0", O_RDWR);
+	if (tf < 0) {
+		fprintf(stderr, "can't open\n");
+		exit(-1);
+	}
+	if (tcgetattr(tf, &tty) != 0) {
+		fprintf(stderr, "tcgetattr failed\n");
+		exit(-1);
+	}
+	if (cfsetspeed(&tty, B115200) != 0) {
+		fprintf(stderr, "cfsetspeed failed\n");
+		exit(-1);
+	}
+	tty.c_cflag &= ~(PARENB|CSTOPB|CSIZE|CRTSCTS);
+	tty.c_cflag |= CS8|CREAD|CLOCAL;
+	tty.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHONL|ISIG);
+	tty.c_iflag &= ~(IXON |IXOFF| IXANY|IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL);
+	tty.c_oflag &= ~(OPOST|ONLCR);
+	tty.c_cc[VTIME] = 0;
+	tty.c_cc[VMIN] = 1;
+	tcsetattr(tf, TCSANOW, &tty);
+	
+	/* ALSA MIDI setup */
+	if (snd_seq_open(&seq, "default", SND_SEQ_OPEN_OUTPUT, 0) != 0) exit(-1);
+	if (snd_seq_set_client_name(seq, "tty2midi") != 0) {
+		fprintf(stderr, "set client name failed\n");
+		exit(-1);
+	}
+	portid = snd_seq_create_simple_port(
+	  seq,
+	  "tty2midi out",
+	  SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ,
+	  SND_SEQ_PORT_TYPE_APPLICATION
+	);
+	if (portid < 0) {
+		fprintf(stderr, "create simple port failed\n");
+		exit(-1);
+	}
+	if (snd_midi_event_new(16, &midi) != 0) {
+		fprintf(stderr, "midi event new failed\n");
+		exit(-1);
+	}
+	while(1) {
+		unsigned char buf[1024];
+		int n, r;
+		/* TODO: add poll(2) */
+		if ((n = read(tf, buf, 1)) == 0) continue;
+
+		//fprintf(stderr, "%x %x %x\t", buf[0],
+		//  buf[1], buf[2]);
+		
+		snd_seq_ev_clear(&ev);
+		snd_seq_ev_set_subs(&ev);
+		snd_seq_ev_set_direct(&ev);
+		snd_seq_ev_set_source(&ev, portid);
+		
+		r = snd_midi_event_encode_byte(midi, *buf, &ev);
+		if (r < 0) {
+			fprintf(stderr, "event encode failed\n");
+		}
+		if (r != 1) continue;
+
+		r = snd_seq_event_output_direct(seq, &ev);
+		if (r < 0) {
+			fprintf(stderr, "event output failed: %s\n", snd_strerror(r));
+		}
+	}
+	return 0;
+}