ext.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file ext.c
* @brief EXT Driver code.
*
* @addtogroup EXT
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_EXT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief EXT Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void extInit(void) {
ext_lld_init();
}
/**
* @brief Initializes the standard part of a @p EXTDriver structure.
*
* @param[out] extp pointer to the @p EXTDriver object
*
* @init
*/
void extObjectInit(EXTDriver *extp) {
extp->state = EXT_STOP;
extp->config = NULL;
}
/**
* @brief Configures and activates the EXT peripheral.
* @post After activation all EXT channels are in the disabled state,
* use @p extChannelEnable() in order to activate them.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] config pointer to the @p EXTConfig object
*
* @api
*/
void extStart(EXTDriver *extp, const EXTConfig *config) {
chDbgCheck((extp != NULL) && (config != NULL), "extStart");
chSysLock();
chDbgAssert((extp->state == EXT_STOP) || (extp->state == EXT_ACTIVE),
"extStart(), #1", "invalid state");
extp->config = config;
ext_lld_start(extp);
extp->state = EXT_ACTIVE;
chSysUnlock();
}
/**
* @brief Deactivates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @api
*/
void extStop(EXTDriver *extp) {
chDbgCheck(extp != NULL, "extStop");
chSysLock();
chDbgAssert((extp->state == EXT_STOP) || (extp->state == EXT_ACTIVE),
"extStop(), #1", "invalid state");
ext_lld_stop(extp);
extp->state = EXT_STOP;
chSysUnlock();
}
/**
* @brief Enables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be enabled
*
* @api
*/
void extChannelEnable(EXTDriver *extp, expchannel_t channel) {
chDbgCheck((extp != NULL) &&
(channel < EXT_MAX_CHANNELS) &&
(extp->config->channels[channel].mode != EXT_CH_MODE_DISABLED),
"extChannelEnable");
chSysLock();
chDbgAssert(extp->state == EXT_ACTIVE,
"extChannelEnable(), #1", "invalid state");
extChannelEnableI(extp, channel);
chSysUnlock();
}
/**
* @brief Disables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be disabled
*
* @api
*/
void extChannelDisable(EXTDriver *extp, expchannel_t channel) {
chDbgCheck((extp != NULL) &&
(channel < EXT_MAX_CHANNELS) &&
(extp->config->channels[channel].mode != EXT_CH_MODE_DISABLED),
"extChannelDisable");
chSysLock();
chDbgAssert(extp->state == EXT_ACTIVE,
"extChannelDisable(), #1", "invalid state");
extChannelDisableI(extp, channel);
chSysUnlock();
}
#endif /* HAL_USE_EXT */
/** @} */