diff options
Diffstat (limited to 'floppyMusic/midi.c')
| -rw-r--r-- | floppyMusic/midi.c | 105 |
1 files changed, 45 insertions, 60 deletions
diff --git a/floppyMusic/midi.c b/floppyMusic/midi.c index ae99371..ca32d5a 100644 --- a/floppyMusic/midi.c +++ b/floppyMusic/midi.c @@ -5,100 +5,85 @@ * Author: Jonas */ - /* - Octave|| Note Numbers - # || - || C | C# | D | D# | E | F | F# | G | G# | A | A# | B - ----------------------------------------------------------------------------- - 0 || 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 - 1 || 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 - 2 || 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 - 3 || 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 - 4 || 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 - 5 || 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 - 6 || 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 - 7 || 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 - 8 || 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 - 9 || 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 - 10 || 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127 | - */ - #include "midi.h" -extern const uint16_t midi_code_frequency_table[] = {8,9,9,10,10,11,12,12,13,14,15,15,16,17,18,19,21,22,23,25,26,28,29,31,33,35,37,39,41,44,46,49,52,55,58,62,65,69,73,78,82,87,93,98,104,110,117,123,131,139,147,156,165,175,185,196,208,220,233,247,262,277,294,311,330,349,370,392,415,440,466,494,523,554,587,622,659,698,740,784,831,880,932,988,1047,1109,1175,1245,1319,1397,1480,1568,1661,1760,1865,1976,2093,2217,2349,2489,2637,2794,2960,3136,3322,3520,3729,3951,4186,4435,4699,4978,5274,5588,5920,6272}; +const uint16_t midi_code_frequency_table[] = {8,9,9,10,10,11,12,12,13,14,15,15,16,17,18,19,21,22,23,25,26,28,29,31,33,35,37,39,41,44,46,49,52,55,58,62,65,69,73,78,82,87,93,98,104,110,117,123,131,139,147,156,165,175,185,196,208,220,233,247,262,277,294,311,330,349,370,392,415,440,466,494,523,554,587,622,659,698,740,784,831,880,932,988,1047,1109,1175,1245,1319,1397,1480,1568,1661,1760,1865,1976,2093,2217,2349,2489,2637,2794,2960,3136,3322,3520,3729,3951,4186,4435,4699,4978,5274,5588,5920,6272}; ISR(USART_RXC_vect) { - cli(); - char status, data1, data2; - char command, channel, note, velocity; + char data[3] = {0x00, 0x00, 0x00}; + char command, /*channel,*/ note/*, velocity*/; - //read data from interface - status = midi_recieve(); - data1 = midi_recieve(); - data2 = midi_recieve(); + UCSRB &= ~(1<<RXCIE);//Disable UART interrupt - sei(); + //read data from interface + while(!(UCSRA & (1<<RXC))); //Wait for data + data[0] = UDR; + + for(int i = 0; i < 20; i++) { //Wait 100µs for next datapackage + _delay_us(1); + if((UCSRA & (1<<RXC))) { + data[1] = UDR; + break; + } + } + for(int i = 0; i < 20; i++) { + _delay_us(1); + if((UCSRA & (1<<RXC))) { + data[2] = UDR; + break; + } + } + UCSRB |= (1<<RXCIE);//reenable UART Interrupt //split data - command = status & 0x0f; //Mask out last 4 bits - channel = (status >> 4) & 0x0f; // Shift channel into first 4 bits; - note = data1; - velocity = data2; - + /*channel = data[0] & 0x0f; //Mask out last 4 bits*/ + command = (data[0] >> 4) & 0x0f; // Shift command into first 4 bits; + note = data[1]; + /*velocity = data2;*/ + + //PORTA = ~command; + switch(command) { case 0x08: //Note off + PORTA = 1; midi_update_note(note, 0); break; - midi_update_note(note, 1); - case 0x09: //Note on + case 0x09: //Note on + PORTA = 2; + midi_update_note(note, 1); break; + /* + case 0x0A:break; //Note Fade Out + + case 0x0B:break; //Control Change - case 0x0A: //Note Fade Out - //unused - break; - - case 0x0B: //Control Change - //unused - break; + case 0x0C:break; //Channel Fade Out - case 0x0C: //Channel Fade Out - //unused - break; - - case 0x0E: //Note Pitch change - //unused - break; + case 0x0E:break; //Note Pitch change + */ + default:break; } - - } void midi_setup() { midi_active_channels = 0x00; - + DDRA = 0xff; + PORTA = 0xff; //UART init unsigned int ubrr = (F_CPU / (16 * _MIDI_LINK_SPEED)) - 1; UBRRH = (unsigned char) (ubrr>>8) & 0xff; UBRRL = (unsigned char) ubrr & 0xff; - UCSRB = (1<<RXEN) | (1<<TXEN); + UCSRB = (1<<RXEN) | (1<<TXEN) | (1<<RXCIE); //Enable Tx, Rx and Rx Interrupt UCSRC = (1<<URSEL) | (1<<USBS) | (3<<UCSZ0); - UCSRB |= (1<<RXCIE); //enable interrupt } - char midi_recieve() - { - while(!(UCSRA & (1<<RXC))); //Wait for data - - return UDR; - } - void midi_update_note(uint16_t _note, uint8_t _status) { if(_status) //Note on |