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midi / midi-main.c

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Trammell Hudson 8fd7b01 




Trammell Hudson 5a0e60a 
Trammell Hudson 3b1c642 
Trammell Hudson 8fd7b01 

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Trammell Hudson 0a0799b 


Trammell Hudson 5a0e60a 
Trammell Hudson 0a0799b 


Trammell Hudson 3b1c642 







Trammell Hudson 0a0799b 




Trammell Hudson 8fd7b01 
Trammell Hudson 0a0799b 
Trammell Hudson 8fd7b01 
Trammell Hudson 0a0799b 

Trammell Hudson 5a0e60a 

Trammell Hudson 0a0799b 




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Trammell Hudson 0a0799b 





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Trammell Hudson 0a0799b 






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Trammell Hudson 8fd7b01 

Trammell Hudson 3b1c642 
Trammell Hudson 8fd7b01 
/** \file
 * USB interface from MIDI pedals
 *
 * Read an MIDI streamand generate key press events
 * based on the events.
 *
 * (c) 2012 Trammell Hudson <hudson@osresearch.net>
 *
 * Based on the
 * Keyboard example with debug channel, for Teensy USB Development Board
 * http://www.pjrc.com/teensy/usb_keyboard.html
 * Copyright (c) 2008 PJRC.COM, LLC
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "usb_keyboard_debug.h"
#include "print.h"

#define CPU_PRESCALE(n)	(CLKPR = 0x80, CLKPR = (n))

#define LED_PIN (1 << 6)

static inline void
led_on(void)
{
	PORTD |= LED_PIN;
	DDRB |=  1 << 7; // OC0A enabled
}

static inline void
led_off(void)
{
	PORTD &= ~LED_PIN;
	DDRB &=  ~(1 << 7); // OC0A disabled
}

static inline void
led_config(void)
{
	DDRD |= LED_PIN;
}


static inline int
midi_ready(void)
{
	return bit_is_set(UCSR1A, RXC1);
}

static uint8_t
midi_getc(void)
{
	while (!midi_ready())
		continue;
	return UDR1;
}


/** Buttons */
static const uint8_t button_map[10] = {
	[0] = KEY_ESC,
	[1] = KEY_SPACE,
	[2] = KEY_INSERT | 0x80,
	[3] = KEY_DOWN,
	[4] = KEY_UP,
	[5] = KEY_F6,
	[6] = KEY_F7,
	[7] = KEY_F8,
	[8] = KEY_F9,
	[9] = KEY_F10,
};


int main(void)
{
	uint8_t b, d, mask, i, reset_idle;
	uint8_t b_prev=0xFF, d_prev=0xFF;

	// set for 16 MHz clock
	CPU_PRESCALE(0);
	led_config();

	// Configure all port B and port D pins as inputs with pullup resistors.
	// See the "Using I/O Pins" page for details.
	// http://www.pjrc.com/teensy/pins.html
	DDRD = 0x00;
	DDRB = 0x00;
	PORTB = 0xFF;
	PORTD = 0xFF;

	// Initialize the USB, and then wait for the host to set configuration.
	// If the Teensy is powered without a PC connected to the USB port,
	// this will wait forever.
	usb_init();
	while (!usb_configured())
	{
		/* busy wait */
	}

	// Turn on the hardware UART for MIDI,
	// 31250 N81 == 1600000 MHz / 32
	UBRR1 = 32;
	UCSR1C = 0
		| (0 << UCSZ12)
		| (1 << UCSZ11)
		| (1 << UCSZ11)
		;

	UCSR1B = (1 << RXEN1);

	// Configure timer 1 to overflow every 10 Hz for repeated
	// mouse motion.  This uses CTC mode; 
	OCR1A = 2500;
	TCCR1A = 0; // WGM11 and WGM10 = 0
	TCCR1B = 0
		| (0 << WGM13) // CTC mode
		| (1 << WGM12)
		| (0 << CS12)
		| (1 << CS11)
		| (1 << CS10) // clock / 64 == 16 Mhz / 64 / 25000 = 10 Hz
		;

	// Wait an extra second for the PC's operating system to load drivers
	// and do whatever it does to actually be ready for input
	_delay_ms(1000);
	print("MIDI decoder\r\n");

	int8_t pedal_value = 0;

	while (1)
	{
		if (!midi_ready())
		{
			if (pedal_value == 0)
				continue;

			if (bit_is_clear(TIFR1, OCF1A))
				continue;

			TIFR1 |= 1 << OCF1A;
			usb_mouse_move(0, 0, pedal_value);
			continue;
		}

		uint8_t c = midi_getc();

		if (c == 0x40)
		{
			uint8_t program = midi_getc();
			uint8_t button = program % 10;
			program /= 10;

			uint8_t c = button_map[button];
			if (c)
			{
				const uint8_t modbit = c & 0x80 ? KEY_SHIFT : 0;
				c &= ~0x80;
				usb_keyboard_press(c, modbit);
			}

			print("button ");
			phex(program);
			print(" ");
			phex(button + 1);
			print("\r\n");
			continue;
		}

		if (c == 0x30)
		{
			uint8_t chan = midi_getc();
			uint8_t val = midi_getc();
			print("pedal ");
			phex(chan);
			print(" ");
			phex(val);
			print("\r\n");

			if (val < 2)
			{
				pedal_value = 0;
				continue;
			}

			// Faster speeds also increase the
			// repeat rate
			pedal_value = -(int8_t)(val/4);
			if (val < 64)
				OCR1A = 25000;
			else
				OCR1A = 16000;
			continue;
		}

		if (c == 0x10)
		{
			// Not sure?  Momentary?
			uint8_t chan = midi_getc();
			uint8_t val = midi_getc();
			print("momentary ");
			phex(chan);
			print(" ");
			phex(val);
			print("\r\n");
			continue;
		}

		phex(c);
		print(" ?\r\n");
	}

	// Not reached
}