mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-14 09:28:59 +00:00
This commit adds cpu, platform and example files, providing support for running Contiki on TI's cc2538 DK
190 lines
7.0 KiB
C
190 lines
7.0 KiB
C
/*
|
|
* Copyright (c) 2013, Texas Instruments Incorporated - http://www.ti.com/
|
|
* 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 copyright holder 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 COPYRIGHT HOLDERS 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
|
|
* COPYRIGHT HOLDER 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.
|
|
*/
|
|
/**
|
|
* \addtogroup cc2538
|
|
* @{
|
|
*
|
|
* \defgroup cc2538-lpm cc2538 Low Power Modes
|
|
*
|
|
* Driver for the cc2538 power modes
|
|
* @{
|
|
*
|
|
* \file
|
|
* Header file with register, macro and function declarations for the cc2538
|
|
* low power module
|
|
*/
|
|
#ifndef LPM_H_
|
|
#define LPM_H_
|
|
|
|
#include "contiki-conf.h"
|
|
#include "rtimer.h"
|
|
|
|
#include <stdint.h>
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \name LPM stats
|
|
*
|
|
* Maintains a record of how many rtimer ticks spent in each Power Mode.
|
|
* Mainly used for debugging the module
|
|
* @{
|
|
*/
|
|
#if LPM_CONF_STATS
|
|
extern rtimer_clock_t lpm_stats[3];
|
|
|
|
/**
|
|
* \brief Read the time spent in a PM in rtimer ticks
|
|
* \param pm The pm as a value in [0,2]
|
|
*/
|
|
#define LPM_STATS_GET(pm) lpm_stats[pm]
|
|
#else
|
|
#define LPM_STATS_GET(pm)
|
|
#endif
|
|
/** @} */
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \name Constants to be used as arguments to lpm_set_max_pm()
|
|
* @{
|
|
*/
|
|
#define LPM_PM0 0
|
|
#define LPM_PM1 1
|
|
#define LPM_PM2 2
|
|
/** @} */
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* \brief Initialise the LPM module
|
|
*/
|
|
void lpm_init(void);
|
|
|
|
/**
|
|
* \brief Drop to Deep Sleep
|
|
*
|
|
* This function triggers a sequence to enter Deep Sleep. The sequence involves
|
|
* determining the most suitable PM and switching the system clock source to
|
|
* the 16MHz if required. If the energest module is enabled, the sequence also
|
|
* performs some simple energest calculations.
|
|
*
|
|
* Broadly speaking, this function will be called from the main loop when all
|
|
* events have been serviced. This functions aims to be clever enough in order
|
|
* to be able to choose between PMs 0/1/2 depending on chip status and
|
|
* anticipated sleep duration. This choice is made subject to configuration
|
|
* restrictions and subject to restrictions imposed by calls to
|
|
* lpm_set_max_pm().
|
|
*
|
|
* This PM selection heuristic has the following primary criteria:
|
|
* - Is the RF off?
|
|
* - Is the USB PLL off?
|
|
* - Is the Sleep Timer scheduled to fire an interrupt?
|
|
*
|
|
* If the answer to any of those questions is no, we will drop to PM0 and
|
|
* will wake up to any interrupt. Best case scenario (if nothing else happens),
|
|
* we will idle until the next SysTick in no more than 1000/CLOCK_SECOND ms
|
|
* (7.8125ms).
|
|
*
|
|
* If all can be answered with 'yes', we can drop to PM1/2 knowing that the
|
|
* Sleep Timer will wake us up. Depending on the estimated deep sleep duration
|
|
* and the max PM allowed by user configuration, we select the most efficient
|
|
* Power Mode to drop to. If the duration is too short, we simply IDLE in PM0.
|
|
*
|
|
* Dropping to PM1/2 requires a switch to the 16MHz OSC. We have the option of
|
|
* letting the SoC do this for us automatically. However, if an interrupt fires
|
|
* during this automatic switch, we will need to re-assert WFI. To avoid this
|
|
* complexity, we perform the switch to the 16MHz OSC manually in software and
|
|
* we assert WFI after the transition has been completed. This gives us a
|
|
* chance to bail out if an interrupt fires or an event is raised during the
|
|
* transition. If nothing happens, dropping to PM1+ is un-interruptible and
|
|
* with a deterministic duration. When we wake up, we switch back to the 32MHz
|
|
* OSC manually before handing control back to main. This is implemented in
|
|
* lpm_exit(), which will always be called from within the Sleep Timer ISR
|
|
* context.
|
|
*
|
|
* \sa main(), rtimer_arch_next_trigger(), lpm_exit(), lpm_set_max_pm()
|
|
*/
|
|
void lpm_enter(void);
|
|
|
|
/**
|
|
* \brief Perform an 'Exit Deep Sleep' sequence
|
|
*
|
|
* This routine is called from within the context of the ISR that caused us to
|
|
* come out of PM1/2. It performs a wake up sequence to make sure the 32MHz OSC
|
|
* is back on and the system clock is sourced on it.
|
|
*
|
|
* While in PMs 1 and 2, the system clock stops ticking. This functions adjusts
|
|
* it when we wake up.
|
|
*
|
|
* We always exit PM1/2 as a result of a scheduled rtimer task or a GPIO
|
|
* interrupt. This may lead to other parts of the code trying to use the RF,
|
|
* so we need to switch the clock source \e before said code gets executed.
|
|
*
|
|
* \sa lpm_enter(), rtimer_isr()
|
|
*/
|
|
void lpm_exit(void);
|
|
|
|
/**
|
|
* \brief Prevent the SoC from dropping to a PM higher than \e max_pm
|
|
* \param pm The highest PM we are allowed to enter, specified as a
|
|
* number in [0, 2]
|
|
*
|
|
* Defines for the \e pm argument are LPM_PMx.
|
|
*
|
|
* This function can be used by software in situations where some power
|
|
* modes are undesirable. If, for example, an application needs to avoid PM2,
|
|
* it would call lpm_set_max_pm(LPM_PM1).
|
|
* If an application wants to avoid PM1 as well, it would call
|
|
* lpm_set_max_pm(LPM_PM0)
|
|
*
|
|
* PM0 can not be disabled at runtime. Use LPM_CONF_ENABLE to disable LPM
|
|
* support altogether
|
|
*
|
|
* \note If the value of argument \e pm is greater than the value of the
|
|
* LPM_CONF_MAX_PM configuration directive, LPM_CONF_MAX_PM is used. Thus
|
|
* if LPM_CONF_MAX_PM==1, calling lpm_set_max_pm(LPM_PM2) would
|
|
* result in a maximum PM set to 1 and all subsequent Deep Sleeps would
|
|
* be limited to either PM0 or PM1.
|
|
*
|
|
* \sa lpm_enter()
|
|
*/
|
|
void lpm_set_max_pm(uint8_t pm);
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Disable the entire module if required */
|
|
#if LPM_CONF_ENABLE==0
|
|
#define lpm_init()
|
|
#define lpm_enter()
|
|
#define lpm_exit()
|
|
#define lpm_set_max_pm(...)
|
|
#endif
|
|
|
|
#endif /* LPM_H_ */
|
|
|
|
/**
|
|
* @}
|
|
* @}
|
|
*/
|