Contiki 2.6
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00001 /* 00002 * Copyright (c) 2010, Loughborough University - Computer Science 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of the Institute nor the names of its contributors 00014 * may be used to endorse or promote products derived from this software 00015 * without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 00018 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 00021 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00022 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00023 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00024 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00025 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00026 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00027 * SUCH DAMAGE. 00028 * 00029 * This file is part of the Contiki operating system. 00030 * 00031 */ 00032 00033 /** 00034 * \file 00035 * Hardware-dependent functions used to support the 00036 * contiki rtimer module. 00037 * 00038 * clock and etimer are using the sleep timer on the cc2430 00039 * 00040 * clock_init() has set our tick speed prescaler already, so we 00041 * are ticking with 500 kHz freq. 00042 * 00043 * rtimer_clock_t is unsigned short (16bit on the cc2430) 00044 * It thus makes sense to use the 16bit clock (Timer 1) 00045 * 00046 * This file contains an ISR and must reside in the HOME bank 00047 * 00048 * \author 00049 * George Oikonomou - <oikonomou@users.sourceforge.net> 00050 */ 00051 00052 #include "sys/rtimer.h" /* Includes rtimer-arch.h for us */ 00053 #include "cc2430_sfr.h" 00054 #include "sys/energest.h" 00055 00056 #define DEBUG 0 00057 #if DEBUG 00058 #include <stdio.h> 00059 #define PRINTF(...) printf(__VA_ARGS__) 00060 #else 00061 #define PRINTF(...) 00062 #endif 00063 00064 /*---------------------------------------------------------------------------*/ 00065 void 00066 rtimer_arch_init(void) 00067 { 00068 PRINTF("rtimer_arch_init() "); 00069 /* 00070 * - Free running mode 00071 * - Prescale by 32: 00072 * Tick Speed has been prescaled to 500 kHz already in clock_init() 00073 * We further prescale by 32 resulting in 15625 Hz for this timer. 00074 */ 00075 T1CTL = (T1DIV1 | T1MODE0); /* 00001001 */ 00076 PRINTF("T1CTL=0x%02x\n", T1CTL); 00077 /* Acknowledge Timer 1 Interrupts */ 00078 IEN1_T1IE = 1; 00079 PRINTF("IEN1_T1IE=0x%02x\n", IEN1_T1IE); 00080 00081 /* Timer 1, Channel 1. Compare Mode (0x04), Interrupt mask on (0x40) */ 00082 T1CCTL1 = T1MODE + T1IM; 00083 PRINTF("T1CCTL1=0x%02x\n", T1CCTL1); 00084 00085 /* Interrupt Mask Flags: No interrupt on overflow */ 00086 TIMIF &= ~OVFIM; 00087 PRINTF("TIMIF=0x%02x\n", TIMIF); 00088 00089 PRINTF("done\n"); 00090 } 00091 /*---------------------------------------------------------------------------*/ 00092 void 00093 rtimer_arch_schedule(rtimer_clock_t t) 00094 { 00095 PRINTF("rtimer_arch_schedule(%u)\n", t); 00096 00097 /* set the compare mode values so we can get an interrupt after t */ 00098 T1CC1L = (unsigned char) t; 00099 T1CC1H = (unsigned char) (t >> 8); 00100 PRINTF("T1CC1=%u, t=%u\n", (T1CC1L + (T1CC1H << 8)), t); 00101 00102 /* Turn on compare mode interrupt */ 00103 PRINTF("T1CTL=0x%02x\n", T1CTL); 00104 T1CCTL1 |= T1IM; 00105 } 00106 /*---------------------------------------------------------------------------*/ 00107 void 00108 cc2430_timer_1_ISR(void) __interrupt (T1_VECTOR) 00109 { 00110 IEN1_T1IE = 0; /* Ignore Timer 1 Interrupts */ 00111 ENERGEST_ON(ENERGEST_TYPE_IRQ); 00112 /* No more interrupts from Channel 1 till next rtimer_arch_schedule() call. 00113 * Setting the mask will instantly generate an interrupt so we clear the 00114 * flag first. */ 00115 T1CTL &= ~(CH1IF); 00116 T1CCTL1 &= ~T1IM; 00117 00118 rtimer_run_next(); 00119 00120 ENERGEST_OFF(ENERGEST_TYPE_IRQ); 00121 IEN1_T1IE = 1; /* Acknowledge Timer 1 Interrupts */ 00122 }