trennfix/sw: Timer based solution seems to work now.
[eisenbahn.git] / trennfix / sw / config / trennfix_0.4.h
1 #ifndef __HARDWARE_H
2 #define __HARDWARE_H
3
4 #include <pin_magic.h>
5
6 #define PIN_LED _PIN(PORTB, PORTB2)
7 #define PIN_SENSE _PIN(PORTB, PORTB4)
8 #define PIN_DRIVE _PIN(PORTB, PORTB3)
9 #define PIN_BTN _PIN(PORTB, PB1)
10 #define PIN_TRIGGER _PIN(PORTB, PB0)
11 #define BTN_PRESSED (!PINVAL(PIN_BTN))
12
13 #define STOP_TIMER1 ({TCCR1 = 0; TCNT1 = 1;})
14
15 #define PWM_CYCLE 21
16
17 static inline void setup_hw(void)
18 {
19 /* Turn off the 1/8 clock prescaler - now running at 16MHz*/
20 CLKPR = (1 << CLKPCE);
21 CLKPR = 0;
22
23 INPUT_PIN(PIN_SENSE);
24 INPUT_PIN(PIN_BTN);
25 OUTPUT_PIN(PIN_DRIVE);
26 OUTPUT_PIN(PIN_LED);
27 OUTPUT_PIN(PIN_TRIGGER);
28 setpin(PIN_LED, 0);
29 setpin(PIN_TRIGGER, 0);
30
31 setpin(PIN_BTN, 1); /* Need pullup */
32
33 GIMSK |= _BV(PCIE); /* Enable pin change interrupt for sense port */
34 PCMSK |= _BV(PCINT4); /* PB4, Rail sense input */
35
36 /* Change interrupt for button */
37 PCMSK |= _BV(PCINT1); /* PB1 */
38
39 /* Setup timer 0, used for mm_switch */
40 TCCR0A = 0; /* Normal mode */
41 TCCR0B = 2; /* Prescaler 8 */
42 // TIMSK |= _BV(OCIE0A); /* Get a match interrupt */
43 TIMSK |= _BV(TOIE0);
44 OCR0A = 100;
45 TCCR0B = 2;
46
47 #ifdef WITH_PWM
48 /* Timer 1 as PWM */
49 OCR1C = PWM_CYCLE;
50 OCR1B = PWM_CYCLE;
51 TCCR1 = 0x5;
52
53 GTCCR |= _BV(PWM1B) | _BV(COM1B0);
54 #endif
55
56 }
57
58 /*
59 * Function to trigger an oscilloscope on the drive pin
60 *
61 * Can be altered to use the LED.
62 *
63 */
64 static inline void __attribute__((unused)) trigger(void)
65 {
66 setpin(PIN_TRIGGER, 1);
67 setpin(PIN_TRIGGER, 0);
68 }
69
70
71 static inline void __attribute__((unused)) trigger_on(void)
72 {
73 setpin(PIN_TRIGGER, 1);
74 }
75
76 static inline void __attribute__((unused)) trigger_off(void)
77 {
78 setpin(PIN_TRIGGER, 0);
79 }
80
81 /*
82 * Configuration for mm receiver code.
83 */
84 #define MM_SENSE (PINVAL(PIN_SENSE))
85 #define MM_TIMER_INT_VECT TIMER0_OVF_vect
86
87 #define MM_TSTART { \
88 GTCCR |= _BV(TSM) | _BV(PSR0); \
89 TCNT0 = 0; \
90 GTCCR &= ~_BV(TSM); \
91 }
92
93 #define MM_RESETFLAG TIFR |= _BV(OVF0)
94
95
96 #ifdef USE_REGISTER_VARS
97 uint8_t register drive_on asm("r12");
98 uint8_t register slope asm("r13");
99 #endif
100
101 #endif