nes-proj/tests/tmr.c

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/*
* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
* to the MC1322x project (http://mc1322x.devl.org)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of libmc1322x: see http://mc1322x.devl.org
* for details.
*
*
*/
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#include <mc1322x.h>
#include <board.h>
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#include "tests.h"
#include "config.h"
#define LED LED_YELLOW
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void main(void) {
/* pin direction */
gpio_pad_dir_set(LED_WHITE);
/* all LEDs off */
gpio_data_reset(LED_WHITE);
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/* timer setup */
/* CTRL */
#define COUNT_MODE 1 /* use rising edge of primary source */
#define PRIME_SRC 0xf /* Perip. clock with 128 prescale (for 24Mhz = 187500Hz)*/
#define SEC_SRC 0 /* don't need this */
#define ONCE 0 /* keep counting */
#define LEN 1 /* count until compare then reload with value in LOAD */
#define DIR 0 /* count up */
#define CO_INIT 0 /* other counters cannot force a re-initialization of this counter */
#define OUT_MODE 0 /* OFLAG is asserted while counter is active */
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*TMR_ENBL = 0; /* tmrs reset to enabled */
*TMR0_SCTRL = 0;
*TMR0_LOAD = 0; /* reload to zero */
*TMR0_COMP_UP = 18750; /* trigger a reload at the end */
*TMR0_CMPLD1 = 18750; /* compare 1 triggered reload level, 10HZ maybe? */
*TMR0_CNTR = 0; /* reset count register */
*TMR0_CTRL = (COUNT_MODE<<13) | (PRIME_SRC<<9) | (SEC_SRC<<7) | (ONCE<<6) | (LEN<<5) | (DIR<<4) | (CO_INIT<<3) | (OUT_MODE);
*TMR_ENBL = 0xf; /* enable all the timers --- why not? */
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while(1) {
/* blink on */
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gpio_data_set(LED);
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while((*TMR0_SCTRL >> 15) == 0) { continue; }
*TMR0_SCTRL = 0; /*clear bit 15, and all the others --- should be ok, but clearly not "the right thing to do" */
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/* blink off */
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gpio_data_reset(LED);
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while((*TMR0_SCTRL >> 15) == 0) { continue; }
*TMR0_SCTRL = 0; /*clear bit 15, and all the others --- should be ok, but clearly not "the right thing to do" */
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};
}