commit 3a92b9a242ffd43047d2da3e6fc21ccdb8d60bc3
Author: Stefan Kalscheuer <stefan@stklcode.de>
Date:   Sat Sep 8 12:04:46 2018 +0200

    Initial Git import from existing sources

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eea6c54
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+*~
+.idea
+firmware/*.o
+firmware/*.elf
+firmware/*.hex
+hardware/*.b#*
+hardware/*.s#*
\ No newline at end of file
diff --git a/firmware/Makefile b/firmware/Makefile
new file mode 100755
index 0000000..8c327d8
--- /dev/null
+++ b/firmware/Makefile
@@ -0,0 +1,16 @@
+CC=avr-gcc
+CFLAGS=-g -Os -Wall -mcall-prologues -mmcu=attiny2313
+OBJ2HEX=avr-objcopy 
+AVRDUDE=avrdude
+TARGET=midifs
+
+program : $(TARGET).hex
+	$(AVRDUDE) -p t2313 -c stk500v2 -P /dev/ttyS0 -U $(TARGET).hex
+%.obj : %.o
+	$(CC) $(CFLAGS) $< -o $@
+
+%.hex : %.obj
+	$(OBJ2HEX) -R .eeprom -O ihex $< $@
+
+clean :
+	rm -f *.hex *.obj *.o
diff --git a/firmware/midifs.c b/firmware/midifs.c
new file mode 100644
index 0000000..44da299
--- /dev/null
+++ b/firmware/midifs.c
@@ -0,0 +1,196 @@
+// midifs.c
+// Typ: C-Sourcerfile
+// Project: MIDI Footswitch
+// Date: 17.06.2014
+// Author: ska
+
+#define F_CPU 8000000UL
+
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+#include "midifs.h"
+#include "usart.h"
+
+volatile unsigned char status_channel, status, channel, data1, data2;
+volatile unsigned int iBtn1_counter = 0, iBtn2_counter = 0, iBtn3_counter = 0, iBtn4_counter = 0, iSw1_counter = 0, iSw2_counter = 0;
+volatile unsigned char cBtn1 = 0, cBtn2 = 0, cBtn3 = 0, cBtn4 = 0, cSw1 = 0, cSw2 = 0;
+volatile unsigned char cChannel = 0, cBank = 0; cTuner = 0;
+unsigned int cnt = 0;
+
+int main (void)
+{
+	DDRB = 0x00;				// PB1..7 as inputs
+	PORTB = 0xFF;				// interlan pull-ups for PB0..7y
+	DDRD = 0x30;				// PD4..5 as outputs
+	PORTD = 0x0C;				// internal pull-ups for PD2..3
+
+	OUT_LED = 0x30;				// LEDs off
+
+	//	Timer1 init
+	TCCR1A |= (1 << WGM01);			//	set timer 0 to CTC-Mode
+	TCCR1B &= ~(1 << CS10);			//	prescaler 8  (1MHz)
+	TCCR1B |= (1 << CS11);
+	TCCR1B &= ~(1 << CS12);
+	OCR1A = 499;				//	period of 1 ms
+
+	cli();					// disable interrupts
+	TIMSK |= (1 << TOIE1);			// activate timer 1
+	sei();					//  enable interrupts
+
+	//USART_Init(38400);			// initialize USART with 38400 baud (debug)
+	USART_Init(31250);			// initialize USART with 31250 baud
+
+	while (1) {
+		if (iBtn1_counter > BTN_THRESHOLD && cBtn1 == 0)		// Button 1
+		{
+			Bank(cBank);
+			USART_Transmit(0xC0);	// Channel 1
+			USART_Transmit(0x00);
+
+			cChannel = 0;
+			cTuner = 0;
+
+			cBtn1 = 1;
+		}
+		else if (iBtn1_counter < BTN_THRESHOLD && cBtn1 == 1)
+			cBtn1 = 0;
+
+		if(iBtn2_counter > BTN_THRESHOLD && cBtn2 == 0)			// Button 2
+		{
+			Bank(cBank);
+			USART_Transmit(0xC0);	// Channel 2
+			USART_Transmit(0x01);
+			cChannel = 1;
+			cTuner = 0;
+
+			cBtn2 = 1;
+		}
+		else if (iBtn2_counter < BTN_THRESHOLD && cBtn2 == 1)
+			cBtn2 = 0;
+
+		if(iBtn3_counter > BTN_THRESHOLD && cBtn3 == 0)			// Button 3
+		{
+			Bank(cBank);
+			USART_Transmit(0xC0);	// Channel 3
+			USART_Transmit(0x02);
+			cChannel = 2;
+			cTuner = 0;
+
+			cBtn3 = 1;
+		}
+		else if (iBtn3_counter < BTN_THRESHOLD && cBtn3 == 1)
+			cBtn3 = 0;
+
+		if(iBtn4_counter > BTN_THRESHOLD && cBtn4 == 0)			// Button 4
+		{
+			USART_Transmit(0xB0);	// Tuner on
+			USART_Transmit(0x0F);
+			USART_Transmit(0x7F);
+
+			//OUT_LED |= (1 << LED_RT);	// LEDs off
+			//OUT_LED |= (1 << LED_GN);
+
+			cTuner = 1;
+
+			cBtn4 = 1;
+		}
+		else if (iBtn4_counter < BTN_THRESHOLD && cBtn4 == 1)
+			cBtn4 = 0;
+
+		if (iSw1_counter > BTN_THRESHOLD && cSw1 == 0)			// Switch Pos. 1
+		{
+			Bank(0);
+			cBank = 0;
+			cTuner = 0;
+
+			cSw1 = 1;
+		}
+		else if (iSw1_counter < BTN_THRESHOLD && cSw1 == 1)
+		{
+			cSw1 = 0;
+		}
+
+		if(iSw2_counter > BTN_THRESHOLD && cSw2 == 0)			// Switch Pos. 2
+		{
+			Bank(1);
+			cBank = 1;
+			cTuner = 0;
+
+			cSw2 = 1;
+		}
+		else if (iSw2_counter < BTN_THRESHOLD && cSw2 == 1)
+		{
+			cSw2 = 0;
+		}
+
+	}
+}
+
+void Bank(unsigned char num) {
+	if(num == 0) {
+		USART_Transmit(0xB0);		// Bank 1
+		USART_Transmit(0x00);
+		USART_Transmit(0x00);
+		USART_Transmit(0xC0);
+		USART_Transmit(0x00);
+		USART_Transmit(cChannel);
+		OUT_LED &= ~(1 << LED_RT);	// LED green
+		OUT_LED |= (1 << LED_GN);
+	}
+	else {
+		USART_Transmit(0xB0);		// Bank 2
+		USART_Transmit(0x00);
+		USART_Transmit(0x01);
+		USART_Transmit(0xC0);
+		USART_Transmit(0x00);
+		USART_Transmit(cChannel);
+		OUT_LED &= ~(1 << LED_GN);	// LED green
+		OUT_LED |= (1 << LED_RT);
+	}
+}
+
+/* interrupt function:	TIMER1_OVF1_vect
+ *
+ * Timer interrupt. Increments counters for inputs
+ */
+ISR(TIMER1_OVF_vect)
+{
+	if(++cnt == 250) cnt = 0;
+	if(cTuner == 1 && cnt == 1) {
+		if(cBank == 1) OUT_LED ^= (1<<LED_GN);
+		else OUT_LED ^= (1<<LED_RT);
+	}
+
+	if (bit_is_clear(IN_BTN, BTN1)) {					// Button 1
+		if (iBtn1_counter < BTN_MAX) iBtn1_counter++;
+	} else {
+		if (iBtn1_counter > 0) iBtn1_counter--;
+	}
+	if (bit_is_clear(IN_BTN, BTN2)) {					// Button 2
+		if (iBtn2_counter < BTN_MAX) iBtn2_counter++;
+	} else {
+		if (iBtn2_counter > 0) iBtn2_counter--;
+	}
+	if (bit_is_clear(IN_BTN, BTN3)) {					// Button 3
+		if (iBtn3_counter < BTN_MAX) iBtn3_counter++;
+	} else {
+		if (iBtn3_counter > 0) iBtn3_counter--;
+	}
+	if (bit_is_clear(IN_BTN, BTN4)) {					// Button 4
+		if (iBtn4_counter < BTN_MAX) iBtn4_counter++;
+	} else {
+		if (iBtn4_counter > 0) iBtn4_counter--;
+	}
+	if (bit_is_clear(IN_SW, SW1)) {						// Switch 1
+		if (iSw1_counter < BTN_MAX) iSw1_counter++;
+	} else {
+		if (iSw1_counter > 0) iSw1_counter--;
+	}
+	if (bit_is_clear(IN_SW, SW2)) {						// Switch 2
+		if (iSw2_counter < BTN_MAX) iSw2_counter++;
+	} else {
+		if (iSw2_counter > 0) iSw2_counter--;
+	}
+}
+
diff --git a/firmware/midifs.h b/firmware/midifs.h
new file mode 100644
index 0000000..4315956
--- /dev/null
+++ b/firmware/midifs.h
@@ -0,0 +1,39 @@
+// midi-to-parport.h
+// Typ: C-Headerfile
+// Project: MIDI-to-Parallelport interface
+// Date: 27.08.2012
+// Author: ska
+
+#define IN_SW	PIND
+#define SW1		PD2
+#define SW2		PD3
+
+#define	IN_BTN	PINB
+#define BTN1	PB0
+#define	BTN2	PB1
+#define	BTN3	PB2
+#define BTN4	PB3
+
+#define OUT_LED	PORTD
+#define LED_RT	PD5
+#define LED_GN	PD4
+
+#define BTN_THRESHOLD	50
+#define BTN_MAX			100
+
+
+void delayms(unsigned int millis) {
+//  uint16_t loop;
+  while ( millis ) {
+    _delay_ms(1);
+    millis--;
+  }
+}
+
+void delayus(unsigned long millis) {
+//  uint16_t loop;
+  while ( millis ) {
+    _delay_us(1);
+    millis--;
+  }
+}
diff --git a/firmware/midifs.hex b/firmware/midifs.hex
new file mode 100644
index 0000000..d3b06cd
--- /dev/null
+++ b/firmware/midifs.hex
@@ -0,0 +1,84 @@
+:1000000012C01FC01EC01DC01CC07BC01AC019C0BA
+:1000100018C017C016C015C014C013C012C011C03C
+:1000200010C00FC00EC011241FBECFEDCDBF20E009
+:10003000A0E6B0E001C01D92AD37B207E1F74AD1AA
+:1000400070C2DECF009741F0EFECF7E03197F1F7A7
+:1000500000C000000197F6CF089561157105810574
+:10006000910549F022E02A95F1F700C0615071092D
+:1000700081099109F2CF08959B01AC0184E0220F20
+:10008000331F441F551F8A95D1F760E072E18AE75C
+:1000900090E025D22150310932B929B9539A86E02E
+:1000A00083B908955F9BFECF8CB108955D9BFECF11
+:1000B0008CB908955F9B02C08CB1FCCF089581116B
+:1000C00010C080EBF3DF80E0F1DF80E0EFDF80EC59
+:1000D000EDDF80E0EBDF80916500E8DF9598949A92
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diff --git a/firmware/usart.h b/firmware/usart.h
new file mode 100644
index 0000000..931593b
--- /dev/null
+++ b/firmware/usart.h
@@ -0,0 +1,36 @@
+void USART_Init( unsigned long baud )
+{
+	/* Calculate UBRR */
+	unsigned int ubrr_val = (unsigned int)((F_CPU/(baud*16L))-1);
+	/* Set baud rate */
+	UBRRH = (unsigned char)(ubrr_val>>8);
+	UBRRL = (unsigned char)ubrr_val;
+	/* Enable transmitter */
+	UCSRB |= (1<<TXEN);
+	/* Set frame format: 8data, 1stop bit */
+	UCSRC = (3<<UCSZ0);
+}
+
+unsigned char USART_Receive( void )
+{
+	/* Wait for data to be received */
+	while ( !(UCSRA & (1<<RXC)) )
+		;
+	/* Get and return received data from buffer */
+	return UDR;
+}
+
+void USART_Transmit( unsigned char data )
+{
+	/* Wait for empty transmit buffer */
+	while ( !( UCSRA & (1<<UDRE)) )
+		;
+	/* Put data into buffer, sends the data */
+	UDR = data;
+}
+
+void USART_Flush( void )
+{
+	unsigned char dummy;
+	while ( UCSRA & (1<<RXC) ) dummy = UDR;
+}