/* 
 * Copyright (c) 2016, Ian Sutton <ian@kremlin.cc>
 *
 * Permission to use, copy, modify, and/or distribute this software for
 * any purpose with or without fee is hereby granted, provided that the
 * above copyright notice and this permission notice appear in all
 * copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
 * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

.origin 0
.entrypoint START /* used by debugger only */

#define PRU0_R31_VEC_VALID (1<<5)
#define SIGNUM 3 /* corresponds to PRU_EVTOUT_0 */

#define DELAY_SECONDS 5
#define CLOCK 200000000
#define CLOCKS_PER_LOOP 2
#define DELAYCOUNT DELAY_SECONDS * CLOCK / CLOCKS_PER_LOOP

START:
	MOV	r1, DELAYCOUNT

DELAY:
	SUB	r1, r1, 1
	QBNE	DELAY, r1, 0

	/* intr */
	MOV	R31.b0, PRU0_R31_VEC_VALID | SIGNUM
	HALT