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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
LPC11xx EXT driver - Copyright (C) 2013 Marcin Jokel
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 LPC11xx/ext_lld.c
* @brief LPC11xx EXT subsystem low level driver source.
*
* @addtogroup EXT
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_EXT || defined(__DOXYGEN__)
#include "ext_lld_isr.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief EXTD0 driver identifier.
*/
#if LPC11xx_EXT_USE_EXT0 || defined(__DOXYGEN__)
EXTDriver EXTD0;
#endif
/**
* @brief EXTD1 driver identifier.
*/
#if LPC11xx_EXT_USE_EXT1 || defined(__DOXYGEN__)
EXTDriver EXTD1;
#endif
/**
* @brief EXTD2 driver identifier.
*/
#if LPC11xx_EXT_USE_EXT2 || defined(__DOXYGEN__)
EXTDriver EXTD2;
#endif
/**
* @brief EXTD3 driver identifier.
*/
#if LPC11xx_EXT_USE_EXT3 || defined(__DOXYGEN__)
EXTDriver EXTD3;
#endif
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level EXT driver initialization.
*
* @notapi
*/
void ext_lld_init(void) {
/* Driver initialization.*/
#if LPC11xx_EXT_USE_EXT0
extObjectInit(&EXTD0);
EXTD0.gpio = LPC_GPIO0;
#endif
#if LPC11xx_EXT_USE_EXT1
extObjectInit(&EXTD1);
EXTD1.gpio = LPC_GPIO1;
#endif
#if LPC11xx_EXT_USE_EXT2
extObjectInit(&EXTD2);
EXTD2.gpio = LPC_GPIO2;
#endif
#if LPC11xx_EXT_USE_EXT3
extObjectInit(&EXTD3);
EXTD3.gpio = LPC_GPIO3;
#endif
}
/**
* @brief Configures and activates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_start(EXTDriver *extp) {
int i;
/* Configure all pins as edge sensitive */
#if LPC11xx_EXT_USE_EXT0
if (extp == &EXTD0) {
LPC_GPIO0->IS = 0;
ext_lld_exti_irq_enable(EXTI0_IRQ);
}
#endif
#if LPC11xx_EXT_USE_EXT1
if (extp == &EXTD1) {
LPC_GPIO1->IS = 0;
ext_lld_exti_irq_enable(EXTI1_IRQ);
}
#endif
#if LPC11xx_EXT_USE_EXT2
if (extp == &EXTD2) {
LPC_GPIO2->IS = 0;
ext_lld_exti_irq_enable(EXTI2_IRQ);
}
#endif
#if LPC11xx_EXT_USE_EXT3
if (extp == &EXTD3) {
LPC_GPIO3->IS = 0;
ext_lld_exti_irq_enable(EXTI3_IRQ);
}
#endif
/* Configuration of autostart channels.*/
for (i = 0; i < EXT_MAX_CHANNELS; i++)
if (extp->config->channels[i].mode & EXT_CH_MODE_AUTOSTART)
ext_lld_channel_enable(extp, i);
else
ext_lld_channel_disable(extp, i);
}
/**
* @brief Deactivates the EXT peripheral.
*
* @param[in] extp pointer to the @p EXTDriver object
*
* @notapi
*/
void ext_lld_stop(EXTDriver *extp) {
LPC_GPIO_TypeDef * gp = extp->gpio;
if (extp->state == EXT_ACTIVE) {
#if LPC11xx_EXT_USE_EXT0
if (extp == &EXTD0) {
ext_lld_exti_irq_disable(EXTI0_IRQ);
}
#endif
#if LPC11xx_EXT_USE_EXT1
if (extp == &EXTD1) {
ext_lld_exti_irq_disable(EXTI1_IRQ);
}
#endif
#if LPC11xx_EXT_USE_EXT2
if (extp == &EXTD2) {
ext_lld_exti_irq_disable(EXTI2_IRQ);
}
#endif
#if LPC11xx_EXT_USE_EXT3
if (extp == &EXTD3) {
ext_lld_exti_irq_disable(EXTI3_IRQ);
}
#endif
}
gp->IE = 0;
gp->IC = 0xFFFFFFFF;
__NOP();
__NOP();
}
/**
* @brief Enables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be enabled
*
* @notapi
*/
void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel) {
LPC_GPIO_TypeDef * gp;
gp = extp->gpio;
/* Programming edge irq enables */
if (extp->config->channels[channel].mode & EXT_CH_MODE_BOTH_EDGES)
gp->IBE |= (1 << channel);
else {
gp->IBE &= ~(1 << channel);
if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
gp->IEV |= (1 << channel);
else
gp->IEV &= (1 << channel);
}
gp->IC = (1 << channel); /* Clear interrupt on selected channel */
__NOP();
__NOP();
gp->IE |= (1 << channel); /* Interrupt on selected channel
is not masked */
}
/**
* @brief Disables an EXT channel.
*
* @param[in] extp pointer to the @p EXTDriver object
* @param[in] channel channel to be disabled
*
* @notapi
*/
void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel) {
LPC_GPIO_TypeDef * gp;
gp = extp->gpio;
gp->IE &= ~(1 << channel); /* Mask interrupt on selected channel */
gp->IC = (1 << channel); /* Clear interrupt on selected channel */
__NOP();
__NOP();
}
#endif /* HAL_USE_EXT */
/** @} */
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