tmr-ints.c

/*
 * 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. 
 *
 *
 */

#include <mc1322x.h>
#include <board.h>

#include "tests.h"
#include "config.h"

volatile uint8_t led;

#define LED LED_PURPLE
#define led_init() do { gpio_pad_dir_set(LED_WHITE); gpio_data_reset(LED_WHITE); } while(0);
#define led_on() do  { led = 1; gpio_data_set(LED); } while(0);
#define led_off() do { led = 0; gpio_data_reset(LED); } while(0);

void toggle_led(void) {
        if(0 == led) {
                led_on();
                led = 1;

        } else {
                led_off();
        }
}

void tmr0_isr(void) {

        toggle_led();
        *TMR0_SCTRL = 0;
        *TMR0_CSCTRL = 0x0040; /* clear compare flag */
        
}


void main(void) {

        /* pin direction */
        led_init();

        /* 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 */

        *TMR_ENBL     = 0;                    /* tmrs reset to enabled */
        *TMR0_SCTRL   = 0;
        *TMR0_CSCTRL  = 0x0040;
        *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? */

        led_on();

        enable_irq(TMR);

        while(1) {              
                /* sit here and let the interrupts do the work */
                continue;
        };
}