104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/**
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* Copyright (c) 2014, Analog Devices, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted (subject to the limitations in the
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* disclaimer below) provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* - Neither the name of Analog Devices, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
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* GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
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* HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \author Jim Paris <jim.paris@rigado.com>
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*/
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#include "lib/sensors.h"
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#include "dev/button-sensor.h"
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#include "platform-conf.h"
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#include <signal.h>
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const struct sensors_sensor button_sensor;
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static struct timer debouncetimer;
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/* e.g. pADI_GP0 */
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#define GPIO CC_CONCAT(pADI_GP, BUTTON_GPIO)
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/* e.g. Ext_Int2_Handler */
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#define HANDLER CC_CONCAT(CC_CONCAT(Ext_Int, BUTTON_INT), _Handler)
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/* e.g. EINT2_IRQn */
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#define IRQN CC_CONCAT(CC_CONCAT(EINT, BUTTON_INT), _IRQn)
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void
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HANDLER(void)
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{
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pADI_INTERRUPT->EICLR = (1 << BUTTON_INT);
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if(!timer_expired(&debouncetimer)) {
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return;
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}
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timer_set(&debouncetimer, CLOCK_SECOND / 8);
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sensors_changed(&button_sensor);
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}
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static int
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config(int type, int c)
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{
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switch(type) {
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case SENSORS_HW_INIT:
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timer_set(&debouncetimer, 0);
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return 1;
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case SENSORS_ACTIVE:
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/* Set button as a GPIO input with pullup */
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GPIO->GPCON &= ~(3UL << (BUTTON_PIN * 2));
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GPIO->GPOEN &= ~(1UL << BUTTON_PIN);
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GPIO->GPPUL |= (1UL << BUTTON_PIN);
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/* Enable interrupt for the button (rise and fall) */
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#if BUTTON_INT <= 3
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pADI_INTERRUPT->EI0CFG |= (0xaUL << (4 * (BUTTON_INT - 0)));
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#elif BUTTON_INT <= 7
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pADI_INTERRUPT->EI1CFG |= (0xaUL << (4 * (BUTTON_INT - 4)));
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#endif
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pADI_INTERRUPT->EICLR = (1 << BUTTON_INT);
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NVIC_EnableIRQ(IRQN);
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return 1;
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}
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return 0;
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}
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static int
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status(int type)
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{
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switch(type) {
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case SENSORS_ACTIVE:
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case SENSORS_READY:
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if(GPIO->GPIN & (1UL << BUTTON_PIN)) {
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return 1;
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}
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return 0;
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}
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return 0;
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}
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SENSORS_SENSOR(button_sensor, BUTTON_SENSOR, NULL, config, status);
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