168 lines
5.0 KiB
C
168 lines
5.0 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file LPC11Uxx/ext_lld.c
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* @brief LPC11Uxx EXT subsystem low level driver source.
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*
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* @addtogroup EXT
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_EXT || defined(__DOXYGEN__)
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#include "ext_lld_isr.h"
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief EXTD1 driver identifier.
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*/
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EXTDriver EXTD1;
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level EXT driver initialization.
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*
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* @notapi
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*/
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void ext_lld_init(void) {
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/* Driver initialization.*/
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extObjectInit(&EXTD1);
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}
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/**
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* @brief Configures and activates the EXT peripheral.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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*
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* @notapi
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*/
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void ext_lld_start(EXTDriver *extp) {
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int i;
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LPC_SYSCON->SYSAHBCLKCTRL |= (1<<19);
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/* Configuration of automatic channels.*/
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for (i = 0; i < EXT_MAX_CHANNELS; i++)
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if (extp->config->channels[i].mode & EXT_CH_MODE_AUTOSTART)
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ext_lld_channel_enable(extp, i);
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else
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ext_lld_channel_disable(extp, i);
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}
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/**
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* @brief Deactivates the EXT peripheral.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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*
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* @notapi
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*/
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void ext_lld_stop(EXTDriver *extp) {
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int i;
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if (extp->state == EXT_ACTIVE)
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for (i = 0; i < EXT_MAX_CHANNELS; i++)
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ext_lld_exti_irq_disable(i);
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LPC_GPIO_PIN_INT->ISEL = 0;
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LPC_GPIO_PIN_INT->CIENR = EXT_CHANNELS_MASK;
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LPC_GPIO_PIN_INT->RISE = EXT_CHANNELS_MASK;
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LPC_GPIO_PIN_INT->FALL = EXT_CHANNELS_MASK;
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LPC_GPIO_PIN_INT->IST = EXT_CHANNELS_MASK;
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<19);
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}
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/**
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* @brief Enables an EXT channel.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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* @param[in] channel channel to be enabled
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*
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* @notapi
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*/
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void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel) {
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/* program the IOpin for this channel */
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LPC_SYSCON->PINTSEL[channel] = extp->config->channels[channel].iopin;
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/* Programming edge irq enables */
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if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
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LPC_GPIO_PIN_INT->SIENR = (1 << channel);
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else
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LPC_GPIO_PIN_INT->CIENR = (1 << channel);
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if (extp->config->channels[channel].mode & EXT_CH_MODE_FALLING_EDGE)
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LPC_GPIO_PIN_INT->SIENF = (1 << channel);
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else
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LPC_GPIO_PIN_INT->CIENF = (1 << channel);
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LPC_GPIO_PIN_INT->RISE = (1<<channel);
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LPC_GPIO_PIN_INT->FALL = (1<<channel);
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LPC_GPIO_PIN_INT->IST = (1<<channel);
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ext_lld_exti_irq_enable( channel );
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}
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/**
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* @brief Disables an EXT channel.
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*
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* @param[in] extp pointer to the @p EXTDriver object
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* @param[in] channel channel to be disabled
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*
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* @notapi
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*/
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void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel) {
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(void)extp;
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ext_lld_exti_irq_disable(channel);
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LPC_GPIO_PIN_INT->ISEL &= ~(1 << channel);
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LPC_GPIO_PIN_INT->CIENR = (1 << channel);
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LPC_GPIO_PIN_INT->RISE = (1 << channel);
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LPC_GPIO_PIN_INT->FALL = (1 << channel);
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LPC_GPIO_PIN_INT->IST = (1 << channel);
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}
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#endif /* HAL_USE_EXT */
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/** @} */
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