76811d3c66
* Add support for the extra 16 GPIO pins in the menus and core.
* Clean up Generic RP2350 PSRAM ("none" is valid) and flash (other than 16MB) options.
* Add extra GPIO<->peripheral connections
* Add Pimoroni PGA2350 RP2350B-based board
* Pins 32-47 can be used for PIOPrograms
* Avoid hang when PSRAM fails to initialize
* Move libpico to an RP2350B board for SDK (otherwise the SDK drops all GPIOHI support)
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
/*
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pulseIn for the Raspberry Pi Pico RP2040
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Copyright (c) 2021 Earle F. Philhower, III <earlephilhower@yahoo.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <Arduino.h>
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#include <hardware/timer.h>
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#include <hardware/gpio.h>
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extern "C" unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout) {
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uint64_t start = time_us_64();
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uint64_t abort = start + timeout;
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if (pin >= __GPIOCNT) {
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DEBUGCORE("ERROR: Illegal pin in pulseIn (%d)\n", pin);
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return 0;
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}
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// Wait for deassert, if needed
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while ((!!gpio_get(pin) != !state) && (time_us_64() < abort));
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if (time_us_64() >= abort) {
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return 0;
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}
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// Wait for assert
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while ((!!gpio_get(pin) != !!state) && (time_us_64() < abort));
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uint64_t begin = time_us_64();
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if (begin >= abort) {
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return 0;
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}
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// Wait for deassert
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while ((!!gpio_get(pin) != !state) && (time_us_64() < abort));
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uint64_t end = time_us_64();
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if (end >= abort) {
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return 0;
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}
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return end - begin;
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}
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extern "C" unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout) {
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return pulseIn(pin, state, timeout);
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}
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