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73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* Copyright (C) 2017 UC Berkeley
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*
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*/
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/**
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* @ingroup drivers_pulse_counter
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* @{
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*
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* @file
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* @brief Driver for the PULSE COUNTER.
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*
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* @author Hyung-Sin Kim <hs.kim@cs.berkeley.edu>
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*
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* @}
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*/
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#include "pulse_counter_params.h"
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#include "pulse_counter.h"
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#define ENABLE_DEBUG 0
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#include "debug.h"
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/* Accumulate pulse count */
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static void pulse_counter_trigger(void *arg)
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{
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pulse_counter_t *dev = (pulse_counter_t *)arg;
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/* Use C11 atomic operations to avoid messing with IRQ flags */
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atomic_fetch_add(&(dev->pulse_count), 1);
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}
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/* Initialize pulse counter */
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int pulse_counter_init(pulse_counter_t *dev, const pulse_counter_params_t *params)
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{
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gpio_mode_t gpio_mode;
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if (params->gpio_flank == GPIO_FALLING) {
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gpio_mode = GPIO_IN_PU;
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}
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else {
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gpio_mode = GPIO_IN_PD;
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}
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if (gpio_init_int(params->gpio, gpio_mode, params->gpio_flank, pulse_counter_trigger, dev)) {
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return -1;
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}
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atomic_init(&dev->pulse_count, 0);
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return 0;
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}
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/* Return the accumulated pulse counts and reset the count to zero */
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int16_t pulse_counter_read_with_reset(pulse_counter_t *dev)
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{
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return atomic_exchange(&(dev->pulse_count), 0);
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}
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/* Return the accumulated pulse counts */
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int16_t pulse_counter_read_without_reset(pulse_counter_t *dev)
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{
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return atomic_load(&dev->pulse_count);
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}
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/* Reset the pulse count value to zero */
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void pulse_counter_reset(pulse_counter_t *dev)
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{
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atomic_store(&(dev->pulse_count), 0);
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}
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