trennfix/sw: Timer based solution seems to work now.

[eisenbahn.git] / trennfix / sw / config / trennfix_0.4.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_BTN   _PIN(PORTB, PB1)
#define PIN_TRIGGER _PIN(PORTB, PB0)
#define BTN_PRESSED (!PINVAL(PIN_BTN))

#define STOP_TIMER1 ({TCCR1 = 0; TCNT1 = 1;})

#define PWM_CYCLE 21

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);
	OUTPUT_PIN(PIN_TRIGGER);
	setpin(PIN_LED, 0);
	setpin(PIN_TRIGGER, 0);
		
	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 = 2; /* Prescaler 8 */
	//	TIMSK |= _BV(OCIE0A);   /* Get a match interrupt */
	TIMSK |= _BV(TOIE0);
	OCR0A = 100; 
	TCCR0B = 2;

#ifdef WITH_PWM	
	/* Timer 1 as PWM */
	OCR1C = PWM_CYCLE;
	OCR1B = PWM_CYCLE;
	TCCR1 = 0x5;

	GTCCR |= _BV(PWM1B) | _BV(COM1B0);
#endif

}

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


static inline void __attribute__((unused)) trigger_on(void)
{
	setpin(PIN_TRIGGER, 1);
}

static inline void __attribute__((unused)) trigger_off(void)
{
	setpin(PIN_TRIGGER, 0);
}

/*
 * Configuration for mm receiver code.
 */
#define MM_SENSE (PINVAL(PIN_SENSE))
#define MM_TIMER_INT_VECT TIMER0_OVF_vect

#define MM_TSTART {							\
		GTCCR  |= _BV(TSM) | _BV(PSR0);				\
		TCNT0   = 0;						\
		GTCCR  &= ~_BV(TSM);					\
	}

#define MM_RESETFLAG  TIFR   |= _BV(OVF0)


#ifdef USE_REGISTER_VARS
uint8_t register drive_on asm("r12");
uint8_t register slope asm("r13");
#endif

#endif