64 lines
2.5 KiB
C
64 lines
2.5 KiB
C
/*
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* Copyright (c) 2014-2016 IBM Corporation.
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* 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 provided that the following conditions are met:
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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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* * 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 distribution.
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* * Neither the name of the <organization> nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "lmic.h"
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#include "hw.h"
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// use PB12 (DIP switch 1)
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#define INP_PORT 1
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#define INP_PIN 12
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static osjob_t irqjob;
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// use DIP1 as sensor value
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void initsensor (osjobcb_t callback) {
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// configure input
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RCC->AHBENR |= RCC_AHBENR_GPIOBEN; // clock enable port B
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hw_cfg_pin(GPIOx(INP_PORT), INP_PIN, GPIOCFG_MODE_INP | GPIOCFG_OSPEED_40MHz | GPIOCFG_OTYPE_OPEN);
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hw_cfg_extirq(INP_PORT, INP_PIN, GPIO_IRQ_CHANGE);
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// save application callback
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irqjob.func = callback;
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}
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// read PB12
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u2_t readsensor () {
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return ((GPIOB->IDR & (1 << INP_PIN)) != 0);
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}
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// called by EXTI_IRQHandler
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// (set preprocessor option CFG_EXTI_IRQ_HANDLER=sensorirq)
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#ifndef CFG_EXTI_IRQ_HANDLER
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#error "CFG_EXTI_IRQ_HANDLER must be defined in makefile!"
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#endif
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void sensorirq () {
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if((EXTI->PR & (1<<INP_PIN)) != 0) { // pending
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EXTI->PR = (1<<INP_PIN); // clear irq
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// run application callback function in 50ms (debounce)
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os_setTimedCallback(&irqjob, os_getTime()+ms2osticks(50), irqjob.func);
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}
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}
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