260 lines
6.4 KiB
C
260 lines
6.4 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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LPC11xx EXT driver - Copyright (C) 2013 Marcin Jokel
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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 LPC11xx/ext_lld.c
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* @brief LPC11xx 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 EXTD0 driver identifier.
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*/
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#if LPC11xx_EXT_USE_EXT0 || defined(__DOXYGEN__)
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EXTDriver EXTD0;
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#endif
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/**
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* @brief EXTD1 driver identifier.
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*/
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#if LPC11xx_EXT_USE_EXT1 || defined(__DOXYGEN__)
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EXTDriver EXTD1;
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#endif
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/**
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* @brief EXTD2 driver identifier.
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*/
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#if LPC11xx_EXT_USE_EXT2 || defined(__DOXYGEN__)
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EXTDriver EXTD2;
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#endif
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/**
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* @brief EXTD3 driver identifier.
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*/
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#if LPC11xx_EXT_USE_EXT3 || defined(__DOXYGEN__)
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EXTDriver EXTD3;
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#endif
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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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#if LPC11xx_EXT_USE_EXT0
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extObjectInit(&EXTD0);
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EXTD0.gpio = LPC_GPIO0;
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#endif
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#if LPC11xx_EXT_USE_EXT1
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extObjectInit(&EXTD1);
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EXTD1.gpio = LPC_GPIO1;
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#endif
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#if LPC11xx_EXT_USE_EXT2
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extObjectInit(&EXTD2);
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EXTD2.gpio = LPC_GPIO2;
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#endif
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#if LPC11xx_EXT_USE_EXT3
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extObjectInit(&EXTD3);
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EXTD3.gpio = LPC_GPIO3;
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#endif
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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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/* Configure all pins as edge sensitive */
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#if LPC11xx_EXT_USE_EXT0
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if (extp == &EXTD0) {
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LPC_GPIO0->IS = 0;
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ext_lld_exti_irq_enable(EXTI0_IRQ);
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}
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#endif
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#if LPC11xx_EXT_USE_EXT1
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if (extp == &EXTD1) {
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LPC_GPIO1->IS = 0;
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ext_lld_exti_irq_enable(EXTI1_IRQ);
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}
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#endif
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#if LPC11xx_EXT_USE_EXT2
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if (extp == &EXTD2) {
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LPC_GPIO2->IS = 0;
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ext_lld_exti_irq_enable(EXTI2_IRQ);
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}
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#endif
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#if LPC11xx_EXT_USE_EXT3
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if (extp == &EXTD3) {
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LPC_GPIO3->IS = 0;
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ext_lld_exti_irq_enable(EXTI3_IRQ);
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}
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#endif
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/* Configuration of autostart 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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LPC_GPIO_TypeDef * gp = extp->gpio;
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if (extp->state == EXT_ACTIVE) {
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#if LPC11xx_EXT_USE_EXT0
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if (extp == &EXTD0) {
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ext_lld_exti_irq_disable(EXTI0_IRQ);
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}
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#endif
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#if LPC11xx_EXT_USE_EXT1
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if (extp == &EXTD1) {
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ext_lld_exti_irq_disable(EXTI1_IRQ);
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}
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#endif
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#if LPC11xx_EXT_USE_EXT2
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if (extp == &EXTD2) {
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ext_lld_exti_irq_disable(EXTI2_IRQ);
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}
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#endif
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#if LPC11xx_EXT_USE_EXT3
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if (extp == &EXTD3) {
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ext_lld_exti_irq_disable(EXTI3_IRQ);
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}
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#endif
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}
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gp->IE = 0;
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gp->IC = 0xFFFFFFFF;
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__NOP();
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__NOP();
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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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LPC_GPIO_TypeDef * gp;
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gp = extp->gpio;
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/* Programming edge irq enables */
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if (extp->config->channels[channel].mode & EXT_CH_MODE_BOTH_EDGES)
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gp->IBE |= (1 << channel);
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else {
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gp->IBE &= ~(1 << channel);
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if (extp->config->channels[channel].mode & EXT_CH_MODE_RISING_EDGE)
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gp->IEV |= (1 << channel);
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else
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gp->IEV &= (1 << channel);
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}
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gp->IC = (1 << channel); /* Clear interrupt on selected channel */
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__NOP();
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__NOP();
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gp->IE |= (1 << channel); /* Interrupt on selected channel
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is not masked */
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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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LPC_GPIO_TypeDef * gp;
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gp = extp->gpio;
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gp->IE &= ~(1 << channel); /* Mask interrupt on selected channel */
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gp->IC = (1 << channel); /* Clear interrupt on selected channel */
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__NOP();
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__NOP();
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}
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#endif /* HAL_USE_EXT */
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/** @} */
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