[eisenbahn.git] / trennfix / sw / mm / src / mm_switch.c

/******************************************************************************
 *
 *  Trennfix firmware -  mm_switch.c
 *
 *  Maerklin Motorola switch command receiver
 *
 *  Copyright (C) 2017 Philipp Hachtmann
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <avr/io.h>
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>

#include <util/delay.h>
#include <stdint.h>

#include <config/hardware.h>
#include <mm/mm_switch.h>


/*
 *
 * Check for stuff we need
 *
 */
#if !defined(MM_TSTART) || !defined(MM_SENSE) || !defined(MM_TIMER_INT_VECT)

#error Missing needed MM_... macro!

#endif

/*
 *    Private global variables
 */

#ifndef MM_USE_REGISTER_VARS

static volatile uint8_t bitno = 0;
static uint8_t shift_command;
static uint8_t shift_function;
static uint8_t shift_address;
static  enum mm_recstate recstate = MM_IDLE;

#endif

/*
 * Lookup trinary nibble
 *
 * This was implemented using a switch statement before.
 * Changing the lookup to a table did only add two bytes
 * of memory and saved ca. 50 bytes program memory.
 */
static const uint8_t nibble_table[16]={
	[0x0] = 0,
	[0xc] = 1,
	[0x8] = 2,
	[0x3] = 3,
	[0xf] = 4,
	[0xb] = 5,
	[0x2] = 6,
	[0xe] = 7,
	[0xa] = 8
};
#define lookup_nibble(nibble) nibble_table[nibble & 0xf]
 
static uint8_t lookup_decoder(uint8_t mm_byte)
{
	uint8_t low;
	uint8_t high;
	if (mm_byte == 0)
		return 80;
	low = lookup_nibble(mm_byte >> 4);
	high = lookup_nibble(mm_byte & 0xf);
	if (!low)
		return 0;
	return 9 * high + low;
}

static uint8_t lookup_command(uint8_t mm_command)
{
	uint8_t res;
	/*
	 * Check for aabbccdd condition
	 * 
	 *        a  a  b  b  c  c  d  d   mm_command
	 *   XOR  a  b  b  c  c  d  d  0   mm_command << 1
	 * Mask   1  0  1  0  1  0  1  0   0xaa
	 *
	 * Must be zero!
	 *
	 */

	if ((mm_command ^ (mm_command << 1)) & 0xaa)
		return 0;
	/*
	 * Protocol differences:
	 * =====================
	 *
	 * I have an old "central control" 6022 and a "control unit" 6021
	 * for measurements and test. It is assumed that the 6022 outputs
	 * old MM1 format while the 6021 definitively outputs MM2 telegrams.
	 * 
	 * In MM1, switch commands are different from MM2 with respect what
	 * happens if you release a button.
	 *
	 * When you press a button, both protocols send
	 *
	 * <aaaaaaaa><00><aabbcc11>
	 *
	 * where a = 1, b = 2, c = 4 and the keys are numerated from 0 to 7
	 * in the order 1 red, 1 green, 2 red, 2 green and so on.
	 * 
	 * The last two bits correspond to "on" state of the button/coil.
	 *
	 * When a key is released under MM1 protocol, the sequence sent is
	 * analogue to the button down sequence:
	 * 
	 * <aaaaaaaa><00><aabbcc00> where abc again represents the button's
	 * address and the last bits now signal "off".
	 *
	 * MM2 handles this differently:
	 * Whenever any key from the addressed decoder is released, the sequence
	 * <aaaaaaaa>00<00000000> is sent - not only for key 0, but for all
	 * keys!
	 *
	 * While MM1 presents the theoretical possibility to press several keys
	 * independently and simultaneously (which my keyboard does NOT
	 * support), MM2 supports only one key at a time (besides strange
	 * sequences like "one down, another down, all up"...
	 * 
	 * A decoder that strictly adheres to the MM1 standard would not work
	 * properly with MM2 control units. As far as I know all K83/K84
	 * decoders always worked with MM2 control units. That means that
	 * they reduce the commands to the possibilities of MM2 from the
	 * beginning.
	 *
	 * Possible use cases for the old protocol button release commands:
	 *   - Determine if the protocol is MM1 or MM2
	 *   - Implement hidden evil features into the controller which can
	 *     only be summoned by old MM1 gear or selfmade control telegram
	 *     generators.
	 *
	 * What this code now actually does:
	 * =================================
	 *
	 * When key pressed (aabbcc11), it will send out the key number in the
	 * range 1-8 and 0 if it gets any key up command and therefore ignore
	 * the key number if it is transmitted with the key up command.
	 *
	 */
	if (!(mm_command & 0x01))
		res = 0;
	else
		res = (mm_command & 0x80) * 1 + (mm_command & 0x20) * 0x02
			+ (mm_command & 0x08) * 0x04 + 1;
	return res;
}


/* We will shift from right to left.
 * XXXXXXXX        XX          XXXXXXXX
 * shift_address   shift_function  shift_command
 *
 * The bits 7 downto 2 of shift_function are ignored.
 */
#define SAVE_ANOTHER_40_BYTES
#ifdef SAVE_ANOTHER_40_BYTES

void shift(uint8_t value)
{
	asm("ror %[val]                 ; Shift value right into carry\n\t"
	    "rol %[cmd]                 ; and shift to command reg\n\t"
	    "mov __tmp_reg__, %[func]   ; save function value \n\t"
	    "rol %[func]                ; Shift up function value\n\t"
	    "ror __tmp_reg__            ; shift bit 1\n\t"
	    "ror  __tmp_reg__           ;          down to carry\n\t"
	    "rol %[addr]                ; And we're at the address\n\t"
	    : [cmd] "=r" (shift_command), [func] "=r" (shift_function),
	      [addr] "=r" (shift_address)
	    : "0" (shift_command), "1" (shift_function),
	    "2" (shift_address), [val] "r" (value)
	    );
}

#else /* This is what we do to shift */

void shift(uint8_t value)
{
	shift_address <<= 1;
	if (shift_function & 2)
		shift_address |= 1;
	shift_function <<= 1;
	if (shift_command & 0x80)
		shift_function |= 1;
	shift_command <<= 1;
	if (value)
		shift_command |= 1;
}
#endif

static volatile uint8_t mm_rec_tolerated_timeouts;


ISR(MM_TIMER_INT_VECT) {

	static volatile uint8_t shift_command_first;
	static volatile uint8_t shift_function_first;
	static volatile uint8_t shift_address_first;
	uint8_t address;
	uint8_t command;

#ifdef MM_FILTER_REPEATED
	static uint8_t address_last = 0xff;
	static uint8_t function_last = 0xff;
	static uint8_t command_last = 0xff;
#endif
	MM_TSTART;

	switch(recstate) {
	case MM_FIRST_FAST_SAMPLE:
		recstate = MM_FIRST_SLOW_SAMPLE;
		break;

	case MM_FIRST_SLOW_SAMPLE:
		bitno = 0;

	case MM_SLOW_SAMPLE:
		recstate = MM_SLOW_WAIT_FOR_CLOCK_DELAY;
		break;

	case MM_SLOW_WAIT_FOR_CLOCK_DELAY:
		recstate = MM_SLOW_WAIT_FOR_CLOCK;
		return;

	case MM_FAST_SAMPLE:
		recstate = MM_FAST_WAIT_FOR_CLOCK;
		break;

	case MM_FAST_WAIT_FOR_CLOCK: /* A timeout! */
		if (mm_rec_tolerated_timeouts)
			mm_rec_tolerated_timeouts--;
		else
			recstate = MM_IDLE;
		return;

	case MM_SLOW_SAMPLE_DELAY:
		recstate = MM_SLOW_SAMPLE;
		return;

	case MM_SLOW_WAIT_FOR_CLOCK:
		if (mm_rec_tolerated_timeouts) {
			mm_rec_tolerated_timeouts--;
			recstate = MM_SLOW_WAIT_FOR_CLOCK_DELAY;
			return;
		}
	default:
		recstate = MM_IDLE;
	case MM_IDLE:
		return;
	}

	shift(MM_SENSE);
	bitno++;

	if (bitno == 18) { /* Save first received word */
		shift_address_first  = shift_address;
		shift_function_first = shift_function;
		shift_command_first  = shift_command;
		mm_rec_tolerated_timeouts = 18;

	} 

	if (bitno == 36) {
		if ((shift_command == shift_command_first) &&
		    (shift_address == shift_address_first) &&
		    (shift_function == shift_function_first)) {
			

#ifdef MM_FILTER_REPEATED
			if ((shift_address != address_last) || (shift_command != command_last) ||
			    shift_function != function_last) {
#endif
				address = lookup_decoder(shift_address);
				if (recstate == MM_SLOW_WAIT_FOR_CLOCK_DELAY) {
					mm_switch_drive(address, shift_function, shift_command);
				} else if (recstate == MM_FAST_WAIT_FOR_CLOCK) {
					command = lookup_command(shift_command);
					mm_switch_command(address, command);
				}
				recstate = MM_IDLE;
#ifdef MM_FILTER_REPEATED
			}
			address_last   = shift_address;
			function_last  = shift_function;
			command_last   = shift_command;
#endif
		}
		
	}
}

//void __attribute((weak)) mm_switch_drive(uint8_t address, uint8_t function, uint8_t command);

ISR(BADISR_vect)
{
	while(1) {
		/*
		setpin(PIN_LED, 1);
		_delay_ms(30);
		setpin(PIN_LED, 0);
		_delay_ms(30);
		setpin(PIN_LED, 1);
		_delay_ms(30);
		setpin(PIN_LED, 0);
		_delay_ms(2000);
		*/
	}
}

ISR(TIM0_OVF_vect)
{
	return;
	while(1) {
	 	setpin(PIN_LED, 1);
		_delay_ms(30);
		setpin(PIN_LED, 0);
		_delay_ms(300);
	}
	
}

uint8_t register sense_last asm("r9");


/* Pin change interrupt vector */
ISR(PCINT0_vect){
	static uint8_t sense_last;
	if (MM_SENSE && !sense_last) {
		MM_TSTART;
		switch(recstate) {
		case MM_IDLE:
			bitno = 0;
			recstate = MM_FIRST_FAST_SAMPLE;
			break;

		case MM_FIRST_SLOW_SAMPLE:
			recstate = MM_FAST_SAMPLE;
			break;

		case MM_FAST_WAIT_FOR_CLOCK:
			recstate = MM_FAST_SAMPLE;
			mm_rec_tolerated_timeouts = 0;
			break;

		case MM_SLOW_WAIT_FOR_CLOCK_DELAY: /* If clock comes early */
			recstate = MM_SLOW_SAMPLE_DELAY;
			break;

		case MM_SLOW_WAIT_FOR_CLOCK:
			recstate = MM_SLOW_SAMPLE_DELAY;
			mm_rec_tolerated_timeouts = 0;
			break;
			
		case MM_SLOW_SAMPLE_DELAY:
			recstate = MM_SLOW_SAMPLE;
			break;
			
			/* Not expected */
		case MM_FIRST_FAST_SAMPLE:
		case MM_FAST_SAMPLE:
		case MM_SLOW_SAMPLE:
			recstate = MM_IDLE;
		default:
			break;
		}
	}
	sense_last = MM_SENSE;
	mm_switch_pinchange_callback();
 }

void __attribute__((weak))mm_switch_pinchange_callback(void)
{
}

void __attribute__((weak))mm_switch_drive(uint8_t decoder, uint8_t function,
					  uint8_t command)
{
}

void __attribute__((weak))mm_switch_command(uint8_t address, uint8_t command)
{
}


/******************************************************************************
 *                        The end :-)
 */
Commit	Line	Data
70095677 PH	1	/******************************************************************************
	2	*
	3	* Trennfix firmware - mm_switch.c
	4	*
	5	* Maerklin Motorola switch command receiver
	6	*
	7	* Copyright (C) 2017 Philipp Hachtmann
	8	*
	9	* This program is free software: you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation, either version 3 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	21	*
	22	*****************************************************************************/
	23
	24	#include <stdio.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27
	28	#include <avr/io.h>
	29	#include <avr/eeprom.h>
	30	#include <avr/interrupt.h>
	31	#include <avr/pgmspace.h>
	32
	33	#include <util/delay.h>
	34	#include <stdint.h>
	35
93cb14d4 PH	36	#include <config/hardware.h>
93cb14d4 PH	37	#include <mm/mm_switch.h>
70095677 PH	38
	39
	40	/*
93cb14d4 PH	41	*
93cb14d4 PH	42	* Check for stuff we need
70095677 PH	43	*
70095677 PH	44	*/
dc41eb22	45	#if !defined(MM_TSTART) \|\| !defined(MM_SENSE) \|\| !defined(MM_TIMER_INT_VECT)
56b25f8b	46
dc41eb22	47	#error Missing needed MM_... macro!
56b25f8b	48
93cb14d4 PH	49	#endif
	50
	51	/*
	52	* Private global variables
	53	*/
93cb14d4	54
7c08d02a PH	55	#ifndef MM_USE_REGISTER_VARS
	56
	57	static volatile uint8_t bitno = 0;
	58	static uint8_t shift_command;
	59	static uint8_t shift_function;
	60	static uint8_t shift_address;
	61	static enum mm_recstate recstate = MM_IDLE;
	62
	63	#endif
93cb14d4 PH	64
	65	/*
	66	* Lookup trinary nibble
	67	*
	68	* This was implemented using a switch statement before.
	69	* Changing the lookup to a table did only add two bytes
	70	* of memory and saved ca. 50 bytes program memory.
	71	*/
	72	static const uint8_t nibble_table[16]={
	73	[0x0] = 0,
	74	[0xc] = 1,
	75	[0x8] = 2,
	76	[0x3] = 3,
	77	[0xf] = 4,
	78	[0xb] = 5,
	79	[0x2] = 6,
	80	[0xe] = 7,
	81	[0xa] = 8
	82	};
	83	#define lookup_nibble(nibble) nibble_table[nibble & 0xf]
	84
70095677 PH	85	static uint8_t lookup_decoder(uint8_t mm_byte)
70095677 PH	86	{
56b25f8b PH	87	uint8_t low;
	88	uint8_t high;
	89	if (mm_byte == 0)
93cb14d4	90	return 80;
56b25f8b PH	91	low = lookup_nibble(mm_byte >> 4);
	92	high = lookup_nibble(mm_byte & 0xf);
	93	if (!low)
70095677	94	return 0;
56b25f8b	95	return 9 * high + low;
70095677 PH	96	}
70095677 PH	97
7c08d02a	98	static uint8_t lookup_command(uint8_t mm_command)
70095677	99	{
7c08d02a PH	100	uint8_t res;
	101	/*
	102	* Check for aabbccdd condition
	103	*
	104	* a a b b c c d d mm_command
	105	* XOR a b b c c d d 0 mm_command << 1
	106	* Mask 1 0 1 0 1 0 1 0 0xaa
	107	*
	108	* Must be zero!
	109	*
	110	*/
	111
	112	if ((mm_command ^ (mm_command << 1)) & 0xaa)
70095677	113	return 0;
7c08d02a PH	114	/*
	115	* Protocol differences:
	116	* =====================
	117	*
	118	* I have an old "central control" 6022 and a "control unit" 6021
	119	* for measurements and test. It is assumed that the 6022 outputs
	120	* old MM1 format while the 6021 definitively outputs MM2 telegrams.
	121	*
	122	* In MM1, switch commands are different from MM2 with respect what
	123	* happens if you release a button.
	124	*
	125	* When you press a button, both protocols send
	126	*
	127	* <aaaaaaaa><00><aabbcc11>
	128	*
	129	* where a = 1, b = 2, c = 4 and the keys are numerated from 0 to 7
	130	* in the order 1 red, 1 green, 2 red, 2 green and so on.
	131	*
	132	* The last two bits correspond to "on" state of the button/coil.
	133	*
	134	* When a key is released under MM1 protocol, the sequence sent is
	135	* analogue to the button down sequence:
	136	*
	137	* <aaaaaaaa><00><aabbcc00> where abc again represents the button's
	138	* address and the last bits now signal "off".
	139	*
	140	* MM2 handles this differently:
	141	* Whenever any key from the addressed decoder is released, the sequence
	142	* <aaaaaaaa>00<00000000> is sent - not only for key 0, but for all
	143	* keys!
	144	*
	145	* While MM1 presents the theoretical possibility to press several keys
	146	* independently and simultaneously (which my keyboard does NOT
	147	* support), MM2 supports only one key at a time (besides strange
	148	* sequences like "one down, another down, all up"...
	149	*
	150	* A decoder that strictly adheres to the MM1 standard would not work
	151	* properly with MM2 control units. As far as I know all K83/K84
	152	* decoders always worked with MM2 control units. That means that
	153	* they reduce the commands to the possibilities of MM2 from the
	154	* beginning.
	155	*
	156	* Possible use cases for the old protocol button release commands:
	157	* - Determine if the protocol is MM1 or MM2
	158	* - Implement hidden evil features into the controller which can
	159	* only be summoned by old MM1 gear or selfmade control telegram
	160	* generators.
	161	*
	162	* What this code now actually does:
	163	* =================================
	164	*
	165	* When key pressed (aabbcc11), it will send out the key number in the
	166	* range 1-8 and 0 if it gets any key up command and therefore ignore
	167	* the key number if it is transmitted with the key up command.
	168	*
	169	*/
	170	if (!(mm_command & 0x01))
	171	res = 0;
	172	else
	173	res = (mm_command & 0x80) * 1 + (mm_command & 0x20) * 0x02
	174	+ (mm_command & 0x08) * 0x04 + 1;
	175	return res;
70095677 PH	176	}
70095677 PH	177
7c08d02a	178
70095677 PH	179	/* We will shift from right to left.
70095677 PH	180	* XXXXXXXX XX XXXXXXXX
56b25f8b	181	* shift_address shift_function shift_command
70095677	182	*
56b25f8b	183	* The bits 7 downto 2 of shift_function are ignored.
70095677	184	*/
7c08d02a PH	185	#define SAVE_ANOTHER_40_BYTES
7c08d02a PH	186	#ifdef SAVE_ANOTHER_40_BYTES
70095677	187
7c08d02a PH	188	void shift(uint8_t value)
	189	{
	190	asm("ror %[val] ; Shift value right into carry\n\t"
	191	"rol %[cmd] ; and shift to command reg\n\t"
	192	"mov __tmp_reg__, %[func] ; save function value \n\t"
	193	"rol %[func] ; Shift up function value\n\t"
	194	"ror __tmp_reg__ ; shift bit 1\n\t"
	195	"ror __tmp_reg__ ; down to carry\n\t"
	196	"rol %[addr] ; And we're at the address\n\t"
	197	: [cmd] "=r" (shift_command), [func] "=r" (shift_function),
	198	[addr] "=r" (shift_address)
	199	: "0" (shift_command), "1" (shift_function),
	200	"2" (shift_address), [val] "r" (value)
	201	);
	202	}
	203
	204	#else /* This is what we do to shift */
	205
	206	void shift(uint8_t value)
70095677	207	{
56b25f8b PH	208	shift_address <<= 1;
	209	if (shift_function & 2)
	210	shift_address \|= 1;
	211	shift_function <<= 1;
	212	if (shift_command & 0x80)
	213	shift_function \|= 1;
	214	shift_command <<= 1;
70095677	215	if (value)
56b25f8b	216	shift_command \|= 1;
70095677	217	}
7c08d02a PH	218	#endif
7c08d02a PH	219
9c77e706 PH	220	static volatile uint8_t mm_rec_tolerated_timeouts;
9c77e706 PH	221
70095677	222
93cb14d4	223	ISR(MM_TIMER_INT_VECT) {
70095677	224
93cb14d4 PH	225	static volatile uint8_t shift_command_first;
	226	static volatile uint8_t shift_function_first;
	227	static volatile uint8_t shift_address_first;
	228	uint8_t address;
	229	uint8_t command;
	230
	231	#ifdef MM_FILTER_REPEATED
56b25f8b PH	232	static uint8_t address_last = 0xff;
	233	static uint8_t function_last = 0xff;
	234	static uint8_t command_last = 0xff;
93cb14d4	235	#endif
dc41eb22 PH	236	MM_TSTART;
dc41eb22 PH	237
70095677	238	switch(recstate) {
7c08d02a	239	case MM_FIRST_FAST_SAMPLE:
dc41eb22	240	recstate = MM_FIRST_SLOW_SAMPLE;
70095677 PH	241	break;
70095677 PH	242
7c08d02a	243	case MM_FIRST_SLOW_SAMPLE:
70095677 PH	244	bitno = 0;
70095677 PH	245
7c08d02a	246	case MM_SLOW_SAMPLE:
9c77e706	247	recstate = MM_SLOW_WAIT_FOR_CLOCK_DELAY;
70095677	248	break;
9c77e706	249
d0047978 PH	250	case MM_SLOW_WAIT_FOR_CLOCK_DELAY:
	251	recstate = MM_SLOW_WAIT_FOR_CLOCK;
	252	return;
	253
7c08d02a PH	254	case MM_FAST_SAMPLE:
7c08d02a PH	255	recstate = MM_FAST_WAIT_FOR_CLOCK;
70095677 PH	256	break;
70095677 PH	257
7c08d02a	258	case MM_FAST_WAIT_FOR_CLOCK: /* A timeout! */
d0047978	259	if (mm_rec_tolerated_timeouts)
9c77e706	260	mm_rec_tolerated_timeouts--;
d0047978	261	else
9c77e706	262	recstate = MM_IDLE;
9c77e706 PH	263	return;
	264
	265	case MM_SLOW_SAMPLE_DELAY:
	266	recstate = MM_SLOW_SAMPLE;
	267	return;
	268
7c08d02a	269	case MM_SLOW_WAIT_FOR_CLOCK:
9c77e706 PH	270	if (mm_rec_tolerated_timeouts) {
	271	mm_rec_tolerated_timeouts--;
	272	recstate = MM_SLOW_WAIT_FOR_CLOCK_DELAY;
70095677 PH	273	return;
70095677 PH	274	}
56b25f8b	275	default:
7c08d02a	276	recstate = MM_IDLE;
9c77e706	277	case MM_IDLE:
70095677 PH	278	return;
70095677 PH	279	}
d0047978	280
70095677 PH	281	shift(MM_SENSE);
70095677 PH	282	bitno++;
56b25f8b	283
70095677	284	if (bitno == 18) { /* Save first received word */
93cb14d4 PH	285	shift_address_first = shift_address;
	286	shift_function_first = shift_function;
	287	shift_command_first = shift_command;
9c77e706	288	mm_rec_tolerated_timeouts = 18;
d0047978	289
70095677	290	}
56b25f8b	291
70095677	292	if (bitno == 36) {
56b25f8b	293	if ((shift_command == shift_command_first) &&
93cb14d4 PH	294	(shift_address == shift_address_first) &&
93cb14d4 PH	295	(shift_function == shift_function_first)) {
d0047978	296
93cb14d4 PH	297
93cb14d4 PH	298	#ifdef MM_FILTER_REPEATED
56b25f8b PH	299	if ((shift_address != address_last) \|\| (shift_command != command_last) \|\|
56b25f8b PH	300	shift_function != function_last) {
93cb14d4 PH	301	#endif
93cb14d4 PH	302	address = lookup_decoder(shift_address);
9c77e706	303	if (recstate == MM_SLOW_WAIT_FOR_CLOCK_DELAY) {
93cb14d4	304	mm_switch_drive(address, shift_function, shift_command);
7c08d02a	305	} else if (recstate == MM_FAST_WAIT_FOR_CLOCK) {
93cb14d4 PH	306	command = lookup_command(shift_command);
93cb14d4 PH	307	mm_switch_command(address, command);
70095677	308	}
d0047978	309	recstate = MM_IDLE;
93cb14d4	310	#ifdef MM_FILTER_REPEATED
70095677	311	}
93cb14d4 PH	312	address_last = shift_address;
	313	function_last = shift_function;
	314	command_last = shift_command;
	315	#endif
70095677	316	}
56b25f8b	317
70095677 PH	318	}
	319	}
	320
56b25f8b PH	321	//void __attribute((weak)) mm_switch_drive(uint8_t address, uint8_t function, uint8_t command);
56b25f8b PH	322
70095677 PH	323	ISR(BADISR_vect)
	324	{
	325	while(1) {
	326	/*
	327	setpin(PIN_LED, 1);
	328	_delay_ms(30);
	329	setpin(PIN_LED, 0);
	330	_delay_ms(30);
	331	setpin(PIN_LED, 1);
	332	_delay_ms(30);
	333	setpin(PIN_LED, 0);
	334	_delay_ms(2000);
	335	*/
	336	}
	337	}
	338
	339	ISR(TIM0_OVF_vect)
	340	{
	341	return;
	342	while(1) {
56b25f8b	343	setpin(PIN_LED, 1);
70095677 PH	344	_delay_ms(30);
	345	setpin(PIN_LED, 0);
	346	_delay_ms(300);
	347	}
	348
	349	}
	350
d0047978 PH	351	uint8_t register sense_last asm("r9");
	352
	353
70095677	354	/* Pin change interrupt vector */
d0047978	355	ISR(PCINT0_vect){
70095677	356	static uint8_t sense_last;
d0047978 PH	357	if (MM_SENSE && !sense_last) {
	358	MM_TSTART;
	359	switch(recstate) {
	360	case MM_IDLE:
	361	bitno = 0;
	362	recstate = MM_FIRST_FAST_SAMPLE;
	363	break;
	364
	365	case MM_FIRST_SLOW_SAMPLE:
	366	recstate = MM_FAST_SAMPLE;
	367	break;
	368
	369	case MM_FAST_WAIT_FOR_CLOCK:
	370	recstate = MM_FAST_SAMPLE;
	371	mm_rec_tolerated_timeouts = 0;
	372	break;
	373
	374	case MM_SLOW_WAIT_FOR_CLOCK_DELAY: /* If clock comes early */
	375	recstate = MM_SLOW_SAMPLE_DELAY;
	376	break;
	377
	378	case MM_SLOW_WAIT_FOR_CLOCK:
	379	recstate = MM_SLOW_SAMPLE_DELAY;
	380	mm_rec_tolerated_timeouts = 0;
	381	break;
	382
	383	case MM_SLOW_SAMPLE_DELAY:
	384	recstate = MM_SLOW_SAMPLE;
	385	break;
	386
	387	/* Not expected */
	388	case MM_FIRST_FAST_SAMPLE:
	389	case MM_FAST_SAMPLE:
	390	case MM_SLOW_SAMPLE:
	391	recstate = MM_IDLE;
	392	default:
	393	break;
	394	}
	395	}
70095677	396	sense_last = MM_SENSE;
d0047978 PH	397	mm_switch_pinchange_callback();
d0047978 PH	398	}
9c77e706	399
d0047978 PH	400	void __attribute__((weak))mm_switch_pinchange_callback(void)
d0047978 PH	401	{
70095677 PH	402	}
70095677 PH	403
93cb14d4 PH	404	void __attribute__((weak))mm_switch_drive(uint8_t decoder, uint8_t function,
	405	uint8_t command)
	406	{
93cb14d4 PH	407	}
	408
	409	void __attribute__((weak))mm_switch_command(uint8_t address, uint8_t command)
	410	{
	411	}
	412
	413
70095677 PH	414	/******************************************************************************
	415	* The end :-)
	416	*/
	417
	418
	419