contiki/cpu/mc1322x/contiki-crm.c

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/*
* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
* to the MC1322x project (http://mc1322x.devl.org) and Contiki.
*
* 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 the Contiki OS.
*
2011-02-13 22:12:33 +00:00
*
*/
#include "mc1322x.h"
#define CRM_DEBUG 1
#if CRM_DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
uint32_t cal_rtc_secs; /* calibrated 2khz rtc seconds */
void sleep(uint32_t opts, uint32_t mode)
{
/* the maca must be off before going to sleep */
/* otherwise the mcu will reboot on wakeup */
// maca_off();
*CRM_SLEEP_CNTL = opts;
*CRM_SLEEP_CNTL = (opts | mode);
/* wait for the sleep cycle to complete */
while(!bit_is_set(*CRM_STATUS,0)) { continue; }
/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and powers down */
set_bit(*CRM_STATUS,0);
/* now we are asleep */
/* and waiting for something to wake us up */
/* you did tell us how to wake up right? */
/* waking up */
while(!bit_is_set(*CRM_STATUS,0)) { continue; }
/* write 1 to sleep_sync --- this clears the bit (it's a r1wc bit) and finishes the wakeup */
set_bit(*CRM_STATUS,0);
/* you may also need to do other recovery */
/* such as interrupt handling */
/* peripheral init */
/* and turning the radio back on */
}
/* turn on the 32kHz crystal */
/* once you start the 32xHz crystal it can only be stopped with a reset (hard or soft) */
void enable_32khz_xtal(void)
{
static volatile uint32_t rtc_count;
PRINTF("enabling 32kHz crystal\n\r");
/* first, disable the ring osc */
ring_osc_off();
/* enable the 32kHZ crystal */
xtal32_on();
/* set the XTAL32_EXISTS bit */
/* the datasheet says to do this after you've check that RTC_COUNT is changing */
/* the datasheet is not correct */
xtal32_exists();
/* now check that the crystal starts */
/* this blocks until it starts */
/* it would be better to timeout and return an error */
rtc_count = *CRM_RTC_COUNT;
PRINTF("waiting for xtal\n\r");
while(*CRM_RTC_COUNT == rtc_count) {
continue;
}
/* RTC has started up */
PRINTF("32kHZ xtal started\n\r");
}
void cal_ring_osc(void)
{
uint32_t cal_factor;
PRINTF("performing ring osc cal\n\r");
PRINTF("crm_status: 0x%0x\n\r",*CRM_STATUS);
PRINTF("sys_cntl: 0x%0x\n\r",*CRM_SYS_CNTL);
*CRM_CAL_CNTL = (1<<16) | (20000);
while((*CRM_STATUS & (1<<9)) == 0);
PRINTF("ring osc cal complete\n\r");
PRINTF("cal_count: 0x%0x\n\r",*CRM_CAL_COUNT);
cal_factor = (REF_OSC*1000) / *CRM_CAL_COUNT;
cal_rtc_secs = (NOMINAL_RING_OSC_SEC * cal_factor)/100;
PRINTF("cal factor: %d\n\r", cal_factor);
PRINTF("hib_wake_secs: %d\n\r", cal_rtc_secs);
set_bit(*CRM_STATUS,9);
}