4 Copyright 2008, 2009 Michel Pollet <buserror@gmail.com>
6 This file is part of simavr.
8 simavr is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 simavr is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with simavr. If not, see <http://www.gnu.org/licenses/>.
22 #ifndef __SIM_INTERUPTS_H__
23 #define __SIM_INTERUPTS_H__
32 // interrupt vector for the IO modules
33 typedef struct avr_int_vector_t {
34 uint8_t vector; // vector number, zero (reset) is reserved
35 avr_regbit_t enable; // IO register index for the "interrupt enable" flag for this vector
36 avr_regbit_t raised; // IO register index for the register where the "raised" flag is (optional)
38 avr_irq_t irq; // raised to 1 when queued, to zero when called
39 uint8_t trace; // only for debug of a vector
44 * Interrupt Helper Functions
46 // register an interrupt vector. It's only needed if you want to use the "r_raised" flags
47 void avr_register_vector(avr_t *avr, avr_int_vector_t * vector);
48 // raise an interrupt (if enabled). The interrupt is latched and will be called later
49 // return non-zero if the interrupt was raised and is now pending
50 int avr_raise_interrupt(avr_t * avr, avr_int_vector_t * vector);
51 // return non-zero if the AVR core has any pending interrupts
52 int avr_has_pending_interrupts(avr_t * avr);
53 // return nonzero if a specific interrupt vector is pending
54 int avr_is_interrupt_pending(avr_t * avr, avr_int_vector_t * vector);
55 // clear the "pending" status of an interrupt
56 void avr_clear_interrupt(avr_t * avr, int v);
57 // called by the core at each cycle to check whether an interrupt is pending
58 void avr_service_interrupts(avr_t * avr);
60 // clear the interrupt (inc pending) if "raised" flag is 1
61 int avr_clear_interupt_if(avr_t * avr, avr_int_vector_t * vector, uint8_t old);
63 // return the IRQ that is raised when the vector is enabled and called/cleared
64 // this allows tracing of pending interupts
65 avr_irq_t * avr_get_interupt_irq(avr_t * avr, uint8_t v);
71 #endif /* __SIM_INTERUPTS_H__ */