trennfix/sw: Register variables, restructuring, whatever

[eisenbahn.git] / trennfix / sw / config / trennfix_attiny25.h

#ifndef __HARDWARE_H
#define __HARDWARE_H

#include <pin_magic.h>

#define PIN_LED   _PIN(PORTB, PORTB2)
#define PIN_SENSE _PIN(PORTB, PORTB4)
//#define PIN_DRIVE _PIN(PORTB, PORTB3)
#define PIN_DRIVE PIN_LED
#define PIN_BTN   _PIN(PORTB, PB1)

#define BTN_PRESSED (!PINVAL(PIN_BTN))

#define START_TIMER0 ({TCNT0 = 0; TCCR0B = 2;})
#define START_TIMER1 ({TCNT1 = 1; TCCR1 = 7; GTCCR |= 2;})
#define STOP_TIMER1 ({TCCR1 = 0; TCNT1 = 1;})


/*
 * Various sinks for valuable program memory
 *
 */
// #define USE_EEPROM_UPDATE /* 14 bytes */
//#define INTERPRET_DRIVE_COMMANDS
#define INTERPRET_DRIVE_SIMPLE

static inline void setup_hw(void)
{
	/* Turn off the 1/8 clock prescaler - now running at 16MHz*/
	CLKPR = (1 << CLKPCE);
	CLKPR = 0;

	INPUT_PIN(PIN_SENSE);
	INPUT_PIN(PIN_BTN);
	OUTPUT_PIN(PIN_DRIVE);
	OUTPUT_PIN(PIN_LED);
	setpin(PIN_BTN, 1);   /* Need pullup              */
	
	GIMSK |= _BV(PCIE);     /* Enable pin change interrupt for sense port */
	PCMSK |= _BV(PCINT4);    /* PB4, Rail sense input */

	/* Change interrupt for button */
	PCMSK |= _BV(PCINT1);    /* PB1 */

	/* Setup timer 0, used for mm_switch */
        TCCR0A = 0; /* Normal mode */
	TCCR0B = 0; /* Timer off */
	TIMSK |= _BV(OCIE0A);   /* Get a match interrupt */
	
	/* We need 13 + 45,5 us delay, That's 464 clocks @8MHz*/
	//OCR0A = 91; /* Prescaler 8 is used */

	/* Timer 1 for timeout */
	/* We set it to 1024us by prescaler 64 and running full 256 */
	// TCCR1 = 7;
	//	TIMSK |= _BV(TOIE1); /* Overflow interrupt */
}

/*
 * Function to trigger an oscilloscope on the drive pin
 *
 * Can be altered to use the LED.
 *
 */
static void __attribute__((unused)) trigger(void)
{
	setpin(PIN_DRIVE, 1);
	_delay_us(4);
	setpin(PIN_DRIVE, 0);
	_delay_us(4);
}

/*
 * Configuration for mm receiver code.
 */

#define MM_SENSE (!PINVAL(PIN_SENSE))
#define MM_TSTART_FAST ({TCNT0 = 0; GTCCR |= 1; OCR0A = 120; TCCR0B = 2;})
#define MM_TSTART_SLOW ({TCNT0 = 0; GTCCR |= 1; OCR0A = 230; TCCR0B = 2;})
#define MM_TSTOP ({TCCR0B = 0;})
#define MM_TIMER_INT_VECT TIMER0_COMPA_vect

/* Costs 63 bytes program memory */
#define MM_FILTER_REPEATED

#define USE_EEPROM_UPDATE
#endif