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authorGravatar Jonas Gunz <himself@jonasgunz.de> 2017-06-21 16:16:17 +0200
committerGravatar Jonas Gunz <himself@jonasgunz.de> 2017-06-21 16:16:17 +0200
commit9d923b5a00916478a84d21c431532e5d3065968c (patch)
tree88d706bc0ee1496791bb917c03fc10011b9d4777 /floppyMusic
parentf9357256249657af2374e3c334b9180e63dc5a30 (diff)
downloadavrFloppy-9d923b5a00916478a84d21c431532e5d3065968c.tar.gz
Implemented MIDI interface
Diffstat (limited to 'floppyMusic')
-rw-r--r--floppyMusic/floppy.c10
-rw-r--r--floppyMusic/floppy.h25
-rw-r--r--floppyMusic/floppyMusic.cproj73
-rw-r--r--floppyMusic/main.c26
-rw-r--r--floppyMusic/midi.c124
-rw-r--r--floppyMusic/midi.h37
-rw-r--r--floppyMusic/uart.c45
-rw-r--r--floppyMusic/uart.h30
8 files changed, 209 insertions, 161 deletions
diff --git a/floppyMusic/floppy.c b/floppyMusic/floppy.c
index 6a12af6..b065302 100644
--- a/floppyMusic/floppy.c
+++ b/floppyMusic/floppy.c
@@ -15,11 +15,11 @@ ISR(TIMER0_OVF_vect)
*fPORT = 0xff; //Deactivate all previously activated pins
- for(uint8_t i = 0; i < 8; i++)
+ for(uint8_t i = 0; i < 8; i++) //Perform check of every channel
{
- if(floppy_nextrun[i] == timer_overflow_counter && floppy_frequencies[i] > 0)
+ if(floppy_nextrun[i] == timer_overflow_counter && floppy_frequencies[i] > 0) //check if pulse is due
{
- floppy_nextrun[i] += floppy_frequencies[i];
+ floppy_nextrun[i] += floppy_frequencies[i]; //set next pulse
floppy_pulse(i);
}
}
@@ -27,7 +27,7 @@ ISR(TIMER0_OVF_vect)
sei();
}
-void floppy_setup(char *_pulse_port, char *_pulse_ddr, char *_direction_port, char *_direction_ddr)
+void floppy_setup(unsigned char *_pulse_port, unsigned char *_pulse_ddr, unsigned char *_direction_port, unsigned char *_direction_ddr)
{
//Setup Ports
fPORT = _pulse_port;
@@ -89,6 +89,8 @@ void floppy_setup(char *_pulse_port, char *_pulse_ddr, char *_direction_port, ch
uint8_t floppy_calc_freq(uint32_t _f_hz)
{
+
+ ///TODO Shift notes out of effective range of FDD into range
if(_f_hz < 31)
return 255;
if(_f_hz > 7813)
diff --git a/floppyMusic/floppy.h b/floppyMusic/floppy.h
index cc069c0..b0a45cb 100644
--- a/floppyMusic/floppy.h
+++ b/floppyMusic/floppy.h
@@ -10,7 +10,7 @@
#define FLOPPY_H_
#ifndef F_CPU
-#define F_CPU 16000000UL
+#error F_CPU not defined for floppy.h
#endif
#include <avr/io.h>
@@ -22,15 +22,32 @@ uint8_t floppy_frequencies[8];
uint8_t floppy_nextrun[8];
uint8_t floppy_head_return_counter[8];
-char *fPORT, *fDDR, *dPORT, *dDDR; //Ports for floppy and Direction of Heads
-
-void floppy_setup(char *_pulse_port, char *_pulse_ddr, char *_direction_port, char *_direction_ddr);
+unsigned char *fPORT, *fDDR, *dPORT, *dDDR; //Ports for floppy and Direction of Heads
+void floppy_setup(unsigned char *_pulse_port, unsigned char *_pulse_ddr, unsigned char *_direction_port, unsigned char *_direction_ddr);
+/*
+* *_pulse_port : port where stepper is connected, eg &PORTA
+* *_pulse_ddr : its direction register, eg &DDRA
+* *_direction_port : Port where direction pins are connected, eg &PORTB
+* *_direction_ddr : its direction register, eg &DDRB
+*/
void floppy_set_frequency(uint8_t _floppy_id, uint8_t _freq);
+/*
+* _floppy_id : [0-7] channel select
+* _freq : [0-255] numerical value representing frequency. use floppy_calc_freq() to calculate from frequency in Hz
+*/
void floppy_pulse(uint8_t _floppy_id);
+/*
+* pulses FDD, keeps track of when to apply head-reverse signal
+* _floppy_id : [0-7] channel select
+*/
uint8_t floppy_calc_freq(uint32_t _f_hz);
+/*
+* Converts frequency in Hz into value used by floppy_set_frequency()
+* _f_hz : Frequency in Hz
+*/
#endif /* FLOPPY_H_ */ \ No newline at end of file
diff --git a/floppyMusic/floppyMusic.cproj b/floppyMusic/floppyMusic.cproj
index 0ab48be..34cd8d5 100644
--- a/floppyMusic/floppyMusic.cproj
+++ b/floppyMusic/floppyMusic.cproj
@@ -82,39 +82,39 @@
<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
<ToolchainSettings>
<AvrGcc>
- <avrgcc.common.Device>-mmcu=atmega32 -B "%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\gcc\dev\atmega32"</avrgcc.common.Device>
- <avrgcc.common.outputfiles.hex>True</avrgcc.common.outputfiles.hex>
- <avrgcc.common.outputfiles.lss>True</avrgcc.common.outputfiles.lss>
- <avrgcc.common.outputfiles.eep>True</avrgcc.common.outputfiles.eep>
- <avrgcc.common.outputfiles.srec>True</avrgcc.common.outputfiles.srec>
- <avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
- <avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
- <avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
- <avrgcc.compiler.symbols.DefSymbols>
- <ListValues>
- <Value>NDEBUG</Value>
- </ListValues>
- </avrgcc.compiler.symbols.DefSymbols>
- <avrgcc.compiler.directories.IncludePaths>
- <ListValues>
- <Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
- </ListValues>
- </avrgcc.compiler.directories.IncludePaths>
- <avrgcc.compiler.optimization.level>Optimize for size (-Os)</avrgcc.compiler.optimization.level>
- <avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
- <avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
- <avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
- <avrgcc.linker.libraries.Libraries>
- <ListValues>
- <Value>libm</Value>
- </ListValues>
- </avrgcc.linker.libraries.Libraries>
- <avrgcc.assembler.general.IncludePaths>
- <ListValues>
- <Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
- </ListValues>
- </avrgcc.assembler.general.IncludePaths>
-</AvrGcc>
+ <avrgcc.common.Device>-mmcu=atmega32 -B "%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\gcc\dev\atmega32"</avrgcc.common.Device>
+ <avrgcc.common.outputfiles.hex>True</avrgcc.common.outputfiles.hex>
+ <avrgcc.common.outputfiles.lss>True</avrgcc.common.outputfiles.lss>
+ <avrgcc.common.outputfiles.eep>True</avrgcc.common.outputfiles.eep>
+ <avrgcc.common.outputfiles.srec>True</avrgcc.common.outputfiles.srec>
+ <avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
+ <avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
+ <avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
+ <avrgcc.compiler.symbols.DefSymbols>
+ <ListValues>
+ <Value>NDEBUG</Value>
+ </ListValues>
+ </avrgcc.compiler.symbols.DefSymbols>
+ <avrgcc.compiler.directories.IncludePaths>
+ <ListValues>
+ <Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
+ </ListValues>
+ </avrgcc.compiler.directories.IncludePaths>
+ <avrgcc.compiler.optimization.level>Optimize for size (-Os)</avrgcc.compiler.optimization.level>
+ <avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
+ <avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
+ <avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
+ <avrgcc.linker.libraries.Libraries>
+ <ListValues>
+ <Value>libm</Value>
+ </ListValues>
+ </avrgcc.linker.libraries.Libraries>
+ <avrgcc.assembler.general.IncludePaths>
+ <ListValues>
+ <Value>%24(PackRepoDir)\atmel\ATmega_DFP\1.2.132\include</Value>
+ </ListValues>
+ </avrgcc.assembler.general.IncludePaths>
+ </AvrGcc>
</ToolchainSettings>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
@@ -131,6 +131,7 @@
<avrgcc.compiler.symbols.DefSymbols>
<ListValues>
<Value>DEBUG</Value>
+ <Value>F_CPU=16000000UL</Value>
</ListValues>
</avrgcc.compiler.symbols.DefSymbols>
<avrgcc.compiler.directories.IncludePaths>
@@ -179,12 +180,6 @@
<Compile Include="music.h">
<SubType>compile</SubType>
</Compile>
- <Compile Include="uart.c">
- <SubType>compile</SubType>
- </Compile>
- <Compile Include="uart.h">
- <SubType>compile</SubType>
- </Compile>
</ItemGroup>
<Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />
</Project> \ No newline at end of file
diff --git a/floppyMusic/main.c b/floppyMusic/main.c
index 7583bc8..6256e97 100644
--- a/floppyMusic/main.c
+++ b/floppyMusic/main.c
@@ -5,28 +5,38 @@
* Author : Jonas
*/
- #ifndef F_CPU
- #define F_CPU 16000000UL //CPU Running at 16MHz
- #endif
+#define _TEST_MODE
#include <avr/io.h>
#include "floppy.h"
+#include "midi.h"
+
+#ifdef _TEST_MODE
#include "music.h"
-#include "uart.h"
+#endif
int main(void)
{
- uart_init(9600);
floppy_setup(&PORTC, &DDRC, &PORTB, &DDRB);
+
+ #ifdef _TEST_MODE //Play imperial March in test mode
+
DDRA = 0xff;
- uart_send_string("Hallo\n");
- while (1)
+ for(;;)
{
play_imperial_march();
_delay_ms(2000);
- uart_send_string("Hallo\n");
}
+
+ #else //Normal MIDI mode
+
+ midi_setup();
+
+ for(;;);
+
+ #endif
+
}
diff --git a/floppyMusic/midi.c b/floppyMusic/midi.c
index ff70a95..ae99371 100644
--- a/floppyMusic/midi.c
+++ b/floppyMusic/midi.c
@@ -5,38 +5,126 @@
* 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"
-void midi_setup()
-{
- uart_init(9600);
-}
+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};
-void midi_recieve(struct midi_command *_command)
+ISR(USART_RXC_vect)
{
- if(!(UCSRB & (1<<RXEN))) //Return if UART reciever not enabled
- return;
-
+ cli();
char status, data1, data2;
char command, channel, note, velocity;
- status = uart_recieve();
- data1 = uart_recieve();
- data2 = uart_recieve();
+ //read data from interface
+ status = midi_recieve();
+ data1 = midi_recieve();
+ data2 = midi_recieve();
- command = status & 0x0f; //Mask out last 4 bits
+ sei();
+
+ //split data
+ command = status & 0x0f; //Mask out last 4 bits
channel = (status >> 4) & 0x0f; // Shift channel into first 4 bits;
note = data1;
velocity = data2;
- _command->command = command;
- _command->channel=channel;
- _command->note = note;
- _command->velocity = velocity;
+ switch(command)
+ {
+ case 0x08: //Note off
+ midi_update_note(note, 0);
+ break;
+ midi_update_note(note, 1);
+ case 0x09: //Note on
+
+ break;
+
+ case 0x0A: //Note Fade Out
+ //unused
+ break;
+
+ case 0x0B: //Control Change
+ //unused
+ break;
+
+ case 0x0C: //Channel Fade Out
+ //unused
+ break;
+
+ case 0x0E: //Note Pitch change
+ //unused
+ break;
+ }
+
}
-void midi_send(struct midi_command _command)
+void midi_setup()
{
+ midi_active_channels = 0x00;
+
+ //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);
+ 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
+ {
+ int i;
+ for(i = 0; i < 8; i++) //search for first free channel
+ if(!(midi_active_channels & (1<<i)))
+ break;
+
+ midi_current_notes[i] = _note; //write current note to channel
+ midi_active_channels |= (1<<i); //set channel active
+ floppy_set_frequency(i, floppy_calc_freq(midi_code_frequency_table[_note]) ); //play note
+ }
-} \ No newline at end of file
+ else //Note off
+ {
+ int i;
+ for(i = 0; i < 8; i++) //search for active channel playing _note
+ {
+ if(midi_current_notes[i] == _note)
+ {
+ floppy_set_frequency(i, 0); //mute
+ midi_current_notes[i] = 0xff; //unset current, 0xff is outside MIDI standards
+ midi_active_channels &= ~(1<<i); //unset channel active
+ break;
+ }
+ }
+ }
+ }
diff --git a/floppyMusic/midi.h b/floppyMusic/midi.h
index f30f1c4..733fe05 100644
--- a/floppyMusic/midi.h
+++ b/floppyMusic/midi.h
@@ -5,30 +5,41 @@
* Author: Jonas
*/
+#ifndef F_CPU
+#error F_CPU not defined for midi.h
+#endif
#ifndef MIDI_H_
#define MIDI_H_
-#define _MIDI_SEND 0
-#define _MIDI_RECIEVE 1
+#define _MIDI_LINK_SPEED 30000UL //Standard MIDI linkspeed is 30k baud
-#include "uart.h"
-struct midi_command
-{
- char command;
- char channel;
- char note;
- char velocity;
-};
+#include <avr/interrupt.h>
+#include <avr/io.h>
-void midi_setup();
+#include "floppy.h"
+
+char midi_active_channels;
+uint16_t midi_current_notes[8];
+const uint16_t midi_code_frequency_table[232];
-void midi_recieve(struct midi_command *_command);
+void midi_setup();
+/*
+* initializes UART communication and Interrupts
+*/
-void midi_send(struct midi_command _command);
+void midi_update_note(uint16_t _note, uint8_t _status);
+/*
+* _note : MIDI standard note #
+* _status : 0=OFF >0=ON
+*/
+char midi_recieve();
+/*
+* reads UART recieve buffer
+*/
#endif /* MIDI_H_ */ \ No newline at end of file
diff --git a/floppyMusic/uart.c b/floppyMusic/uart.c
deleted file mode 100644
index 3aac221..0000000
--- a/floppyMusic/uart.c
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * uart.c
- *
- * Created: 02.05.2017 20:48:26
- * Author: Jonas
- */
-
- #include "uart.h"
-
- void uart_init(unsigned int _baud)
- {
- unsigned int ubrr = (F_CPU / (16 * _baud)) - 1;
-
- UBRRH = (unsigned char)(ubrr>>8) & 0xff;
- UBRRL = (unsigned char)ubrr & 0xff;
-
- UCSRB = (1<<RXEN)|(1<<TXEN);
- UCSRC = (1<<URSEL)|(1<<USBS)|(3<<UCSZ0);
- }
-
- void uart_send(char _data)
- {
- while(!(UCSRA & (1<<UDRE))); //Wait for previous data to be sent
- UDR = _data;
- }
-
- void uart_send_string(char *_data)
- {
- char *data = _data;
-
- while(*data != '\0')
- {
- uart_send(*data);
- data++;
- }
- }
-
- char uart_recieve()
- {
- while(!(UCSRA & (1<<RXC))); //Wait for data
-
- return UDR;
- }
-
-
diff --git a/floppyMusic/uart.h b/floppyMusic/uart.h
deleted file mode 100644
index 1954357..0000000
--- a/floppyMusic/uart.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * uart.h
- *
- * Created: 02.05.2017 20:48:16
- * Author: Jonas
- */
-
-
-#ifndef UART_H_
-#define UART_H_
-
-#ifndef F_CPU
-#define F_CPU 16000000UL //CPU Running at 16MHz
-#endif
-
-#include <avr/io.h>
-
-
-#define _GET_UBBR(BAUD) ( (F_CPU / 16 * BAUD) - 1)
-
-void uart_init(unsigned int _baud);
-
-void uart_send(char _data);
-
-void uart_send_string(char *_data);
-
-char uart_recieve(void);
-
-
-#endif /* UART_H_ */ \ No newline at end of file