Contiki 2.6

tmr-ints.c

00001 /*
00002  * Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
00003  * to the MC1322x project (http://mc1322x.devl.org)
00004  * All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  * 3. Neither the name of the Institute nor the names of its contributors
00015  *    may be used to endorse or promote products derived from this software
00016  *    without specific prior written permission.
00017  *
00018  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00019  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00020  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00021  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00022  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00023  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00024  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00025  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00026  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00027  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * This file is part of libmc1322x: see http://mc1322x.devl.org
00031  * for details. 
00032  *
00033  *
00034  */
00035 
00036 #include <mc1322x.h>
00037 #include <board.h>
00038 
00039 #include "tests.h"
00040 #include "config.h"
00041 
00042 volatile uint8_t led;
00043 
00044 #define LED LED_PURPLE
00045 #define led_init() do { gpio_pad_dir_set(LED_WHITE); gpio_data_reset(LED_WHITE); } while(0);
00046 #define led_on() do  { led = 1; gpio_data_set(LED); } while(0);
00047 #define led_off() do { led = 0; gpio_data_reset(LED); } while(0);
00048 
00049 void toggle_led(void) {
00050         if(0 == led) {
00051                 led_on();
00052                 led = 1;
00053 
00054         } else {
00055                 led_off();
00056         }
00057 }
00058 
00059 void tmr0_isr(void) {
00060 
00061         toggle_led();
00062         *TMR0_SCTRL = 0;
00063         *TMR0_CSCTRL = 0x0040; /* clear compare flag */
00064         
00065 }
00066 
00067 
00068 void main(void) {
00069 
00070         /* pin direction */
00071         led_init();
00072 
00073         /* timer setup */
00074         /* CTRL */
00075 #define COUNT_MODE 1      /* use rising edge of primary source */
00076 #define PRIME_SRC  0xf    /* Perip. clock with 128 prescale (for 24Mhz = 187500Hz)*/
00077 #define SEC_SRC    0      /* don't need this */
00078 #define ONCE       0      /* keep counting */
00079 #define LEN        1      /* count until compare then reload with value in LOAD */
00080 #define DIR        0      /* count up */
00081 #define CO_INIT    0      /* other counters cannot force a re-initialization of this counter */
00082 #define OUT_MODE   0      /* OFLAG is asserted while counter is active */
00083 
00084         *TMR_ENBL     = 0;                    /* tmrs reset to enabled */
00085         *TMR0_SCTRL   = 0;
00086         *TMR0_CSCTRL  = 0x0040;
00087         *TMR0_LOAD    = 0;                    /* reload to zero */
00088         *TMR0_COMP_UP = 18750;                /* trigger a reload at the end */
00089         *TMR0_CMPLD1  = 18750;                /* compare 1 triggered reload level, 10HZ maybe? */
00090         *TMR0_CNTR    = 0;                    /* reset count register */
00091         *TMR0_CTRL    = (COUNT_MODE<<13) | (PRIME_SRC<<9) | (SEC_SRC<<7) | (ONCE<<6) | (LEN<<5) | (DIR<<4) | (CO_INIT<<3) | (OUT_MODE);
00092         *TMR_ENBL     = 0xf;                  /* enable all the timers --- why not? */
00093 
00094         led_on();
00095 
00096         enable_irq(TMR);
00097 
00098         while(1) {              
00099                 /* sit here and let the interrupts do the work */
00100                 continue;
00101         };
00102 }