trennfix/sw: Register variables, restructuring, whatever

[eisenbahn.git] / trennfix / sw / mm / include / mm / mm_switch.h

#ifndef MM_SWITCH_H
#define MM_SWITCH_H

#include <stdint.h>

enum mm_recstate {
	MM_IDLE = 0,
	MM_FIRST_FAST_SAMPLE,
	MM_FIRST_SLOW_SAMPLE, /* If clock arrives, we stay on the fast path! */
	MM_FAST_SAMPLE,
	MM_FAST_WAIT_FOR_CLOCK,
	MM_SLOW_SAMPLE,
	MM_SLOW_WAIT_FOR_CLOCK,
};

#ifdef MM_USE_REGISTER_VARS

uint8_t register shift_command  asm("r2");
uint8_t register shift_function asm("r3");
uint8_t register shift_address asm("r4");
uint8_t  register recstate asm("r5");
uint8_t register bitno asm("r6");

static void inline __attribute((unused)) mm_init(void)
{
	bitno = 0;
	recstate = MM_IDLE;
}

#else

#define mm_init(...)

#endif

/*
 * mm_switch_command - Callback function!
 *
 * This function must be defined whenever the mm_switch module is used.
 * It will be called from interrupt context whenever a new valid command
 * has arrived.
 *
 * decoder is in the range from 1 to 25. Other values will not occur.
 * 
 * key is in the range from 0 to 8:
 *
 *   1 - key1 green pressed
 *   2 - key1 red pressed
 *   3 - key2 green pressed
 *   4 - key2 red pressed
 *   ...
 *   0 - all keys up
 * 
 */
void mm_switch_command(uint8_t decoder, uint8_t key);

/*
 *  empty comment :-)
 */
void mm_switch_drive_cb(uint8_t address, uint8_t speed, uint8_t functions, uint8_t flags);

void mm_switch_drive(uint8_t decoder, uint8_t function, uint8_t command);

void mm_pinchange_handler(void);


#endif