From: Tomas Mudrunka <tomas@mudrunka.cz>
Date: Tue, 16 Apr 2013 08:09:35 +0000 (+0200)
Subject: FTDI USB MIDI connection
X-Git-Url: https://git.harvie.cz/?a=commitdiff_plain;h=233e34bb486439ff24580eb34362591d22289b81;p=mirrors%2FPrograms.git

FTDI USB MIDI connection
---

diff --git a/c/ghetto-sound-system/.gitignore b/c/ghetto-sound-system/.gitignore
new file mode 100644
index 0000000..b9d7d15
--- /dev/null
+++ b/c/ghetto-sound-system/.gitignore
@@ -0,0 +1,6 @@
+.gitignore
+sampler
+synth
+beatdetect
+midi-rx
+ftdi-midi
diff --git a/c/ghetto-sound-system/Makefile b/c/ghetto-sound-system/Makefile
index 260a436..d99fdb5 100644
--- a/c/ghetto-sound-system/Makefile
+++ b/c/ghetto-sound-system/Makefile
@@ -6,9 +6,9 @@ sdl_CFLAGS+=$(shell sdl-config --cflags --libs) -lSDL_mixer
 sdl_CFLAGS+=-lm #synth
 alsa_CFLAGS+=-lasound
 
-.PHONY: all clean sdl alsa go
+.PHONY: all clean sdl alsa go midi
 all: sdl alsa
-	echo .gitignore $(sdl_BIN) $(alsa_BIN) | tr ' ' '\n' > .gitignore
+	echo .gitignore $(sdl_BIN) $(alsa_BIN) ftdi-midi | tr ' ' '\n' > .gitignore
 clean:
 	rm .gitignore $(sdl_BIN) $(alsa_BIN)
 
@@ -17,6 +17,9 @@ sdl:
 alsa:
 	$(MAKE) CFLAGS="$(alsa_CFLAGS)" $(alsa_BIN)
 
+midi:
+	$(MAKE) CFLAGS="-lftdi -lasound" ftdi-midi
+
 
 go: sampler
 	./$? samples/*/* 2>/dev/null
diff --git a/c/ghetto-sound-system/ftdi-midi.c b/c/ghetto-sound-system/ftdi-midi.c
new file mode 100644
index 0000000..652141e
--- /dev/null
+++ b/c/ghetto-sound-system/ftdi-midi.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <alsa/asoundlib.h>
+#include <ftdi.h>
+
+
+#define BAUD 31250
+
+static snd_rawmidi_t *midi_in, *midi_out;
+struct ftdi_context ftdi;
+
+int main(void) {
+
+
+	snd_rawmidi_open(&midi_in, &midi_out, "virtual", SND_RAWMIDI_NONBLOCK);
+	//snd_rawmidi_open(&midi_in, &midi_out, "virtual", 0);
+
+
+	if (ftdi_init( &ftdi )) {
+		fprintf(stderr,  "usb - init error !\n");
+		return 1;
+	}
+
+	if (ftdi_usb_open(&ftdi, 0x0403, 0x6001)) {
+		fprintf(stderr,  "usb - open error (cannot find?) !\n");
+		fprintf(stderr, "ftdi_usb_open failed, error (%s)\n", ftdi_get_error_string(&ftdi));
+		ftdi_deinit( &ftdi );
+		return 2;
+	}
+
+	if (ftdi_usb_reset( &ftdi )) {
+		fprintf(stderr,  "usb - reset error !\n");
+		ftdi_usb_close( &ftdi );
+		ftdi_deinit( &ftdi );
+		return 3;
+	}
+
+	ftdi_disable_bitbang( &ftdi );
+	ftdi_set_baudrate(&ftdi, BAUD);
+
+	unsigned char buf;
+	int ret;
+	while(1) {
+		//FTDI2MIDI
+		ret = ftdi_read_data(&ftdi,&buf,1);
+		if(ret < 0) break;
+		if(ret > 0) snd_rawmidi_write(midi_out, &buf, 1);
+
+		//MIDI2FTDI
+		ret = snd_rawmidi_read(midi_in,&buf,1);
+		if(ret < 0 && ret != -EAGAIN) break;
+		if(ret > 0) ftdi_write_data(&ftdi, &buf, 1);
+
+		usleep(1000);
+	}
+	exit(0);
+}