[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>

/*
 *    Private data types
 */


/*
 *
 * Check for stuff we need
 *
 */
#if !defined(MM_TSTART_FAST) || !defined(MM_TSTART_SLOW) || !defined(MM_TSTOP) \
	|| !defined(MM_SENSE) || !defined(MM_TIMER_INT_VECT)

#error Missing timer start macro MM_TSTART_FAST!

#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


ISR(MM_TIMER_INT_VECT) {
	static uint8_t tolerated_timeouts = 0;

	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

	switch(recstate) {
	case MM_FIRST_FAST_SAMPLE:
		recstate = MM_FIRST_SLOW_SAMPLE;
		MM_TSTART_FAST; /* Will not run out in fast! */
		break;

	case MM_FIRST_SLOW_SAMPLE:
		bitno = 0;

	case MM_SLOW_SAMPLE:
		recstate = MM_SLOW_WAIT_FOR_CLOCK;
		MM_TSTART_SLOW;
		break;
	
	case MM_FAST_SAMPLE:
		recstate = MM_FAST_WAIT_FOR_CLOCK;
		MM_TSTART_FAST;
		break;

	case MM_FAST_WAIT_FOR_CLOCK: /* A timeout! */
		if (tolerated_timeouts) {
			tolerated_timeouts--;
			MM_TSTART_FAST;
			return;
		}
		recstate = MM_IDLE;
		MM_TSTOP;
		return;

	case MM_SLOW_WAIT_FOR_CLOCK:
		if (tolerated_timeouts) {
			tolerated_timeouts--;
			MM_TSTART_SLOW;
			return;
		}
	default:
		MM_TSTOP;
		recstate = 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;

		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) {
					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);
				}
#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);
	}
	
}

/* Pin change interrupt vector */
void mm_pinchange_handler(void)
{
	static uint8_t sense_last;

	if (MM_SENSE == sense_last)
		return;
	sense_last = MM_SENSE;
	if (!sense_last)
		return;

	switch(recstate) {
	case MM_IDLE:
		bitno = 0;
		recstate = MM_FIRST_FAST_SAMPLE;
		MM_TSTART_FAST;
		break;
	case MM_FIRST_SLOW_SAMPLE:
		recstate = MM_FAST_SAMPLE;
		MM_TSTART_FAST;
		break;
	case MM_FAST_WAIT_FOR_CLOCK:
		recstate = MM_FAST_SAMPLE;
		MM_TSTART_FAST;
		break;
	case MM_SLOW_WAIT_FOR_CLOCK:
		recstate = MM_SLOW_SAMPLE;
		MM_TSTART_SLOW;
		break;

		/* Not expected */
	case MM_FIRST_FAST_SAMPLE:
	case MM_FAST_SAMPLE:
	case MM_SLOW_SAMPLE:
	default:
		break;
	}
}

void __attribute__((weak))mm_switch_drive(uint8_t decoder, uint8_t function,
					  uint8_t command)
{
	while(1);
}

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	38
93cb14d4 PH	39	/*
	40	* Private data types
	41	*/
	42
70095677 PH	43
70095677 PH	44	/*
93cb14d4 PH	45	*
93cb14d4 PH	46	* Check for stuff we need
70095677 PH	47	*
70095677 PH	48	*/
93cb14d4 PH	49	#if !defined(MM_TSTART_FAST) \|\| !defined(MM_TSTART_SLOW) \|\| !defined(MM_TSTOP) \
93cb14d4 PH	50	\|\| !defined(MM_SENSE) \|\| !defined(MM_TIMER_INT_VECT)
56b25f8b	51
93cb14d4	52	#error Missing timer start macro MM_TSTART_FAST!
56b25f8b	53
93cb14d4 PH	54	#endif
	55
	56	/*
	57	* Private global variables
	58	*/
93cb14d4	59
7c08d02a PH	60	#ifndef MM_USE_REGISTER_VARS
	61
	62	static volatile uint8_t bitno = 0;
	63	static uint8_t shift_command;
	64	static uint8_t shift_function;
	65	static uint8_t shift_address;
	66	static enum mm_recstate recstate = MM_IDLE;
	67
	68	#endif
93cb14d4 PH	69
	70	/*
	71	* Lookup trinary nibble
	72	*
	73	* This was implemented using a switch statement before.
	74	* Changing the lookup to a table did only add two bytes
	75	* of memory and saved ca. 50 bytes program memory.
	76	*/
	77	static const uint8_t nibble_table[16]={
	78	[0x0] = 0,
	79	[0xc] = 1,
	80	[0x8] = 2,
	81	[0x3] = 3,
	82	[0xf] = 4,
	83	[0xb] = 5,
	84	[0x2] = 6,
	85	[0xe] = 7,
	86	[0xa] = 8
	87	};
	88	#define lookup_nibble(nibble) nibble_table[nibble & 0xf]
	89
70095677 PH	90	static uint8_t lookup_decoder(uint8_t mm_byte)
70095677 PH	91	{
56b25f8b PH	92	uint8_t low;
	93	uint8_t high;
	94	if (mm_byte == 0)
93cb14d4	95	return 80;
56b25f8b PH	96	low = lookup_nibble(mm_byte >> 4);
	97	high = lookup_nibble(mm_byte & 0xf);
	98	if (!low)
70095677	99	return 0;
56b25f8b	100	return 9 * high + low;
70095677 PH	101	}
70095677 PH	102
7c08d02a	103	static uint8_t lookup_command(uint8_t mm_command)
70095677	104	{
7c08d02a PH	105	uint8_t res;
	106	/*
	107	* Check for aabbccdd condition
	108	*
	109	* a a b b c c d d mm_command
	110	* XOR a b b c c d d 0 mm_command << 1
	111	* Mask 1 0 1 0 1 0 1 0 0xaa
	112	*
	113	* Must be zero!
	114	*
	115	*/
	116
	117	if ((mm_command ^ (mm_command << 1)) & 0xaa)
70095677	118	return 0;
7c08d02a PH	119	/*
	120	* Protocol differences:
	121	* =====================
	122	*
	123	* I have an old "central control" 6022 and a "control unit" 6021
	124	* for measurements and test. It is assumed that the 6022 outputs
	125	* old MM1 format while the 6021 definitively outputs MM2 telegrams.
	126	*
	127	* In MM1, switch commands are different from MM2 with respect what
	128	* happens if you release a button.
	129	*
	130	* When you press a button, both protocols send
	131	*
	132	* <aaaaaaaa><00><aabbcc11>
	133	*
	134	* where a = 1, b = 2, c = 4 and the keys are numerated from 0 to 7
	135	* in the order 1 red, 1 green, 2 red, 2 green and so on.
	136	*
	137	* The last two bits correspond to "on" state of the button/coil.
	138	*
	139	* When a key is released under MM1 protocol, the sequence sent is
	140	* analogue to the button down sequence:
	141	*
	142	* <aaaaaaaa><00><aabbcc00> where abc again represents the button's
	143	* address and the last bits now signal "off".
	144	*
	145	* MM2 handles this differently:
	146	* Whenever any key from the addressed decoder is released, the sequence
	147	* <aaaaaaaa>00<00000000> is sent - not only for key 0, but for all
	148	* keys!
	149	*
	150	* While MM1 presents the theoretical possibility to press several keys
	151	* independently and simultaneously (which my keyboard does NOT
	152	* support), MM2 supports only one key at a time (besides strange
	153	* sequences like "one down, another down, all up"...
	154	*
	155	* A decoder that strictly adheres to the MM1 standard would not work
	156	* properly with MM2 control units. As far as I know all K83/K84
	157	* decoders always worked with MM2 control units. That means that
	158	* they reduce the commands to the possibilities of MM2 from the
	159	* beginning.
	160	*
	161	* Possible use cases for the old protocol button release commands:
	162	* - Determine if the protocol is MM1 or MM2
	163	* - Implement hidden evil features into the controller which can
	164	* only be summoned by old MM1 gear or selfmade control telegram
	165	* generators.
	166	*
	167	* What this code now actually does:
	168	* =================================
	169	*
	170	* When key pressed (aabbcc11), it will send out the key number in the
	171	* range 1-8 and 0 if it gets any key up command and therefore ignore
	172	* the key number if it is transmitted with the key up command.
	173	*
	174	*/
	175	if (!(mm_command & 0x01))
	176	res = 0;
	177	else
	178	res = (mm_command & 0x80) * 1 + (mm_command & 0x20) * 0x02
	179	+ (mm_command & 0x08) * 0x04 + 1;
	180	return res;
70095677 PH	181	}
70095677 PH	182
7c08d02a	183
70095677 PH	184	/* We will shift from right to left.
70095677 PH	185	* XXXXXXXX XX XXXXXXXX
56b25f8b	186	* shift_address shift_function shift_command
70095677	187	*
56b25f8b	188	* The bits 7 downto 2 of shift_function are ignored.
70095677	189	*/
7c08d02a PH	190	#define SAVE_ANOTHER_40_BYTES
7c08d02a PH	191	#ifdef SAVE_ANOTHER_40_BYTES
70095677	192
7c08d02a PH	193	void shift(uint8_t value)
	194	{
	195	asm("ror %[val] ; Shift value right into carry\n\t"
	196	"rol %[cmd] ; and shift to command reg\n\t"
	197	"mov __tmp_reg__, %[func] ; save function value \n\t"
	198	"rol %[func] ; Shift up function value\n\t"
	199	"ror __tmp_reg__ ; shift bit 1\n\t"
	200	"ror __tmp_reg__ ; down to carry\n\t"
	201	"rol %[addr] ; And we're at the address\n\t"
	202	: [cmd] "=r" (shift_command), [func] "=r" (shift_function),
	203	[addr] "=r" (shift_address)
	204	: "0" (shift_command), "1" (shift_function),
	205	"2" (shift_address), [val] "r" (value)
	206	);
	207	}
	208
	209	#else /* This is what we do to shift */
	210
	211	void shift(uint8_t value)
70095677	212	{
56b25f8b PH	213	shift_address <<= 1;
	214	if (shift_function & 2)
	215	shift_address \|= 1;
	216	shift_function <<= 1;
	217	if (shift_command & 0x80)
	218	shift_function \|= 1;
	219	shift_command <<= 1;
70095677	220	if (value)
56b25f8b	221	shift_command \|= 1;
70095677	222	}
7c08d02a PH	223	#endif
7c08d02a PH	224
70095677	225
93cb14d4 PH	226	ISR(MM_TIMER_INT_VECT) {
93cb14d4 PH	227	static uint8_t tolerated_timeouts = 0;
70095677	228
93cb14d4 PH	229	static volatile uint8_t shift_command_first;
	230	static volatile uint8_t shift_function_first;
	231	static volatile uint8_t shift_address_first;
	232	uint8_t address;
	233	uint8_t command;
	234
	235	#ifdef MM_FILTER_REPEATED
56b25f8b PH	236	static uint8_t address_last = 0xff;
	237	static uint8_t function_last = 0xff;
	238	static uint8_t command_last = 0xff;
93cb14d4	239	#endif
70095677 PH	240
70095677 PH	241	switch(recstate) {
7c08d02a PH	242	case MM_FIRST_FAST_SAMPLE:
7c08d02a PH	243	recstate = MM_FIRST_SLOW_SAMPLE;
93cb14d4	244	MM_TSTART_FAST; /* Will not run out in fast! */
70095677 PH	245	break;
70095677 PH	246
7c08d02a	247	case MM_FIRST_SLOW_SAMPLE:
70095677 PH	248	bitno = 0;
70095677 PH	249
7c08d02a PH	250	case MM_SLOW_SAMPLE:
7c08d02a PH	251	recstate = MM_SLOW_WAIT_FOR_CLOCK;
93cb14d4	252	MM_TSTART_SLOW;
70095677 PH	253	break;
70095677 PH	254
7c08d02a PH	255	case MM_FAST_SAMPLE:
7c08d02a PH	256	recstate = MM_FAST_WAIT_FOR_CLOCK;
93cb14d4	257	MM_TSTART_FAST;
70095677 PH	258	break;
70095677 PH	259
7c08d02a	260	case MM_FAST_WAIT_FOR_CLOCK: /* A timeout! */
93cb14d4 PH	261	if (tolerated_timeouts) {
	262	tolerated_timeouts--;
	263	MM_TSTART_FAST;
70095677 PH	264	return;
70095677 PH	265	}
7c08d02a	266	recstate = MM_IDLE;
93cb14d4	267	MM_TSTOP;
70095677 PH	268	return;
70095677 PH	269
7c08d02a	270	case MM_SLOW_WAIT_FOR_CLOCK:
93cb14d4 PH	271	if (tolerated_timeouts) {
	272	tolerated_timeouts--;
	273	MM_TSTART_SLOW;
70095677 PH	274	return;
70095677 PH	275	}
56b25f8b	276	default:
93cb14d4	277	MM_TSTOP;
7c08d02a	278	recstate = MM_IDLE;
70095677 PH	279	return;
	280	}
	281
	282	shift(MM_SENSE);
	283	bitno++;
56b25f8b	284
70095677	285	if (bitno == 18) { /* Save first received word */
93cb14d4 PH	286	shift_address_first = shift_address;
	287	shift_function_first = shift_function;
	288	shift_command_first = shift_command;
70095677	289
93cb14d4	290	tolerated_timeouts = 18;
70095677	291	}
56b25f8b	292
70095677	293	if (bitno == 36) {
56b25f8b	294	if ((shift_command == shift_command_first) &&
93cb14d4 PH	295	(shift_address == shift_address_first) &&
	296	(shift_function == shift_function_first)) {
	297
	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);
56b25f8b	303
7c08d02a	304	if (recstate == MM_SLOW_WAIT_FOR_CLOCK) {
93cb14d4	305	mm_switch_drive(address, shift_function, shift_command);
7c08d02a	306	} else if (recstate == MM_FAST_WAIT_FOR_CLOCK) {
93cb14d4 PH	307	command = lookup_command(shift_command);
93cb14d4 PH	308	mm_switch_command(address, command);
70095677	309	}
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
70095677 PH	351	/* Pin change interrupt vector */
	352	void mm_pinchange_handler(void)
	353	{
	354	static uint8_t sense_last;
	355
	356	if (MM_SENSE == sense_last)
	357	return;
	358	sense_last = MM_SENSE;
	359	if (!sense_last)
	360	return;
56b25f8b	361
70095677	362	switch(recstate) {
7c08d02a	363	case MM_IDLE:
70095677	364	bitno = 0;
7c08d02a	365	recstate = MM_FIRST_FAST_SAMPLE;
93cb14d4	366	MM_TSTART_FAST;
70095677	367	break;
7c08d02a PH	368	case MM_FIRST_SLOW_SAMPLE:
7c08d02a PH	369	recstate = MM_FAST_SAMPLE;
93cb14d4	370	MM_TSTART_FAST;
70095677	371	break;
7c08d02a PH	372	case MM_FAST_WAIT_FOR_CLOCK:
7c08d02a PH	373	recstate = MM_FAST_SAMPLE;
93cb14d4	374	MM_TSTART_FAST;
70095677	375	break;
7c08d02a PH	376	case MM_SLOW_WAIT_FOR_CLOCK:
7c08d02a PH	377	recstate = MM_SLOW_SAMPLE;
93cb14d4	378	MM_TSTART_SLOW;
70095677 PH	379	break;
	380
	381	/* Not expected */
7c08d02a PH	382	case MM_FIRST_FAST_SAMPLE:
	383	case MM_FAST_SAMPLE:
	384	case MM_SLOW_SAMPLE:
70095677 PH	385	default:
	386	break;
	387	}
	388	}
	389
93cb14d4 PH	390	void __attribute__((weak))mm_switch_drive(uint8_t decoder, uint8_t function,
	391	uint8_t command)
	392	{
	393	while(1);
	394	}
	395
	396	void __attribute__((weak))mm_switch_command(uint8_t address, uint8_t command)
	397	{
	398	}
	399
	400
70095677 PH	401	/******************************************************************************
	402	* The end :-)
	403	*/
	404
	405
	406