| 1 | #include <stdio.h> |
| 2 | #include <unistd.h> |
| 3 | #include <alsa/asoundlib.h> |
| 4 | #include <ftdi.h> |
| 5 | |
| 6 | |
| 7 | #define BAUD 31250 |
| 8 | #define BUFFER_SIZE 1 |
| 9 | #define LATENCY 0 |
| 10 | |
| 11 | static snd_rawmidi_t *midi_in, *midi_out; |
| 12 | struct ftdi_context ftdi; |
| 13 | |
| 14 | int main(void) { |
| 15 | |
| 16 | |
| 17 | snd_rawmidi_open(&midi_in, &midi_out, "virtual", SND_RAWMIDI_NONBLOCK); |
| 18 | //snd_rawmidi_open(&midi_in, &midi_out, "virtual", 0); |
| 19 | |
| 20 | |
| 21 | if (ftdi_init( &ftdi )) { |
| 22 | fprintf(stderr, "usb - init error !\n"); |
| 23 | return 1; |
| 24 | } |
| 25 | |
| 26 | if (ftdi_usb_open(&ftdi, 0x0403, 0x6001)) { |
| 27 | fprintf(stderr, "usb - open error (cannot find?) !\n"); |
| 28 | fprintf(stderr, "ftdi_usb_open failed, error (%s)\n", ftdi_get_error_string(&ftdi)); |
| 29 | ftdi_deinit( &ftdi ); |
| 30 | return 2; |
| 31 | } |
| 32 | |
| 33 | if (ftdi_usb_reset( &ftdi )) { |
| 34 | fprintf(stderr, "usb - reset error !\n"); |
| 35 | ftdi_usb_close( &ftdi ); |
| 36 | ftdi_deinit( &ftdi ); |
| 37 | return 3; |
| 38 | } |
| 39 | |
| 40 | ftdi_disable_bitbang( &ftdi ); |
| 41 | ftdi_set_baudrate(&ftdi, BAUD); |
| 42 | |
| 43 | unsigned char buf[BUFFER_SIZE]; |
| 44 | int ret; |
| 45 | while(1) { |
| 46 | //FTDI2MIDI |
| 47 | ret = ftdi_read_data(&ftdi, buf, BUFFER_SIZE); |
| 48 | if(ret < 0) break; |
| 49 | if(ret > 0) snd_rawmidi_write(midi_out, buf, BUFFER_SIZE); |
| 50 | |
| 51 | //MIDI2FTDI |
| 52 | /* |
| 53 | ret = snd_rawmidi_read(midi_in, buf,BUFFER_SIZE); |
| 54 | if(ret < 0 && ret != -EAGAIN) break; |
| 55 | if(ret > 0) ftdi_write_data(&ftdi, buf,BUFFER_SIZE); |
| 56 | */ |
| 57 | usleep(LATENCY); |
| 58 | } |
| 59 | exit(0); |
| 60 | } |