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/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file ext.c
* @brief EXT Driver code.
*
* @addtogroup EXT
* @{
*/
#include "hal.h"
#if (HAL_USE_EXT == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* 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) {
osalDbgCheck((extp != NULL) && (config != NULL));
osalSysLock();
osalDbgAssert((extp->state == EXT_STOP) || (extp->state == EXT_ACTIVE),
"invalid state");
extp->config = config;
ext_lld_start(extp);
extp->state = EXT_ACTIVE;
osalSysUnlock();
}
/**
* @brief Deactivates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @api
*/
void extStop(EXTDriver *extp) {
osalDbgCheck(extp != NULL);
osalSysLock();
osalDbgAssert((extp->state == EXT_STOP) || (extp->state == EXT_ACTIVE),
"invalid state");
ext_lld_stop(extp);
extp->state = EXT_STOP;
osalSysUnlock();
}
/**
* @brief Enables an EXT channel.
* @pre The channel must not be in @p EXT_CH_MODE_DISABLED mode.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be enabled
*
* @api
*/
void extChannelEnable(EXTDriver *extp, expchannel_t channel) {
osalDbgCheck((extp != NULL) && (channel < (expchannel_t)EXT_MAX_CHANNELS));
osalSysLock();
osalDbgAssert((extp->state == EXT_ACTIVE) &&
((extp->config->channels[channel].mode &
EXT_CH_MODE_EDGES_MASK) != EXT_CH_MODE_DISABLED),
"invalid state");
extChannelEnableI(extp, channel);
osalSysUnlock();
}
/**
* @brief Disables an EXT channel.
* @pre The channel must not be in @p EXT_CH_MODE_DISABLED mode.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be disabled
*
* @api
*/
void extChannelDisable(EXTDriver *extp, expchannel_t channel) {
osalDbgCheck((extp != NULL) && (channel < (expchannel_t)EXT_MAX_CHANNELS));
osalSysLock();
osalDbgAssert((extp->state == EXT_ACTIVE) &&
((extp->config->channels[channel].mode &
EXT_CH_MODE_EDGES_MASK) != EXT_CH_MODE_DISABLED),
"invalid state");
extChannelDisableI(extp, channel);
osalSysUnlock();
}
/**
* @brief Changes the operation mode of a channel.
* @note This function attempts to write over the current configuration
* structure that must have been not declared constant. This
* violates the @p const qualifier in @p extStart() but it is
* intentional.
* @note This function cannot be used if the configuration structure is
* declared @p const.
* @note The effect of this function on constant configuration structures
* is not defined.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be changed
* @param[in] extcp new configuration for the channel
*
* @iclass
*/
void extSetChannelModeI(EXTDriver *extp,
expchannel_t channel,
const EXTChannelConfig *extcp) {
EXTChannelConfig *oldcp;
osalDbgCheck((extp != NULL) &&
(channel < (expchannel_t)EXT_MAX_CHANNELS) &&
(extcp != NULL));
osalDbgAssert(extp->state == EXT_ACTIVE, "invalid state");
/* Note that here the access is enforced as non-const, known access
violation.*/
/*lint -save -e9005 [11.8] Known issue, the driver needs rework here.*/
oldcp = (EXTChannelConfig *)&extp->config->channels[channel];
/*lint -restore*/
/* Overwriting the old channels configuration then the channel is
reconfigured by the low level driver.*/
*oldcp = *extcp;
ext_lld_channel_enable(extp, channel);
}
#endif /* HAL_USE_EXT == TRUE */
/** @} */
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