1145fa9ba9
based on commit aac3a355451d899f02737f2907af8c874ee4feba of git://git.devl.org/git/malvira/contiki-mc1322x.git
121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/*
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* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
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* to the MC1322x project (http://mc1322x.devl.org) and Contiki.
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki OS.
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*
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* $Id: contiki-crm.c,v 1.1 2010/06/09 14:43:22 maralvira Exp $
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*/
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#include "mc1322x.h"
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#define CRM_DEBUG 1
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#if CRM_DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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uint32_t cal_rtc_secs; /* calibrated 2khz rtc seconds */
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void sleep(uint32_t opts, uint32_t mode)
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{
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/* the maca must be off before going to sleep */
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/* otherwise the mcu will reboot on wakeup */
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// maca_off();
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*CRM_SLEEP_CNTL = opts;
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*CRM_SLEEP_CNTL = (opts | mode);
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/* wait for the sleep cycle to complete */
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while(!bit_is_set(*CRM_STATUS,0)) { continue; }
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/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and powers down */
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set_bit(*CRM_STATUS,0);
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/* now we are asleep */
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/* and waiting for something to wake us up */
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/* you did tell us how to wake up right? */
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/* waking up */
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while(!bit_is_set(*CRM_STATUS,0)) { continue; }
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/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and finishes the wakeup */
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set_bit(*CRM_STATUS,0);
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/* you may also need to do other recovery */
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/* such as interrupt handling */
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/* peripheral init */
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/* and turning the radio back on */
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}
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/* turn on the 32kHz crystal */
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/* once you start the 32xHz crystal it can only be stopped with a reset (hard or soft) */
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void enable_32khz_xtal(void)
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{
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static volatile uint32_t rtc_count;
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PRINTF("enabling 32kHz crystal\n\r");
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/* first, disable the ring osc */
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ring_osc_off();
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/* enable the 32kHZ crystal */
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xtal32_on();
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/* set the XTAL32_EXISTS bit */
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/* the datasheet says to do this after you've check that RTC_COUNT is changing */
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/* the datasheet is not correct */
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xtal32_exists();
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/* now check that the crystal starts */
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/* this blocks until it starts */
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/* it would be better to timeout and return an error */
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rtc_count = *CRM_RTC_COUNT;
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PRINTF("waiting for xtal\n\r");
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while(*CRM_RTC_COUNT == rtc_count) {
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continue;
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}
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/* RTC has started up */
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PRINTF("32kHZ xtal started\n\r");
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}
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void cal_ring_osc(void)
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{
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uint32_t cal_factor;
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PRINTF("performing ring osc cal\n\r");
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PRINTF("crm_status: 0x%0x\n\r",*CRM_STATUS);
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PRINTF("sys_cntl: 0x%0x\n\r",*CRM_SYS_CNTL);
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*CRM_CAL_CNTL = (1<<16) | (20000);
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while((*CRM_STATUS & (1<<9)) == 0);
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PRINTF("ring osc cal complete\n\r");
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PRINTF("cal_count: 0x%0x\n\r",*CRM_CAL_COUNT);
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cal_factor = (REF_OSC*1000) / *CRM_CAL_COUNT;
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cal_rtc_secs = (NOMINAL_RING_OSC_SEC * cal_factor)/100;
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PRINTF("cal factor: %d\n\r", cal_factor);
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PRINTF("hib_wake_secs: %d\n\r", cal_rtc_secs);
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set_bit(*CRM_STATUS,9);
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}
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