usb_hid: Update arduino cores to 1.8.13

[max/tmk_keyboard.git] / tmk_core / protocol / usb_hid / arduino-1.8.13 / cores / arduino / wiring_pulse.c

diff --git a/tmk_core/protocol/usb_hid/arduino-1.8.13/cores/arduino/wiring_pulse.c b/tmk_core/protocol/usb_hid/arduino-1.8.13/cores/arduino/wiring_pulse.c
new file mode 100644 (file)
index 0000000..d6e0434
--- /dev/null
+++ b/tmk_core/protocol/usb_hid/arduino-1.8.13/cores/arduino/wiring_pulse.c
@@ -0,0 +1,93 @@
+/*
+  wiring_pulse.c - pulseIn() function
+  Part of Arduino - http://www.arduino.cc/
+
+  Copyright (c) 2005-2006 David A. Mellis
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+*/
+
+#include "wiring_private.h"
+#include "pins_arduino.h"
+
+/* Measures the length (in microseconds) of a pulse on the pin; state is HIGH
+ * or LOW, the type of pulse to measure.  Works on pulses from 2-3 microseconds
+ * to 3 minutes in length, but must be called at least a few dozen microseconds
+ * before the start of the pulse.
+ *
+ * This function performs better with short pulses in noInterrupt() context
+ */
+unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout)
+{
+       // cache the port and bit of the pin in order to speed up the
+       // pulse width measuring loop and achieve finer resolution.  calling
+       // digitalRead() instead yields much coarser resolution.
+       uint8_t bit = digitalPinToBitMask(pin);
+       uint8_t port = digitalPinToPort(pin);
+       uint8_t stateMask = (state ? bit : 0);
+
+       // convert the timeout from microseconds to a number of times through
+       // the initial loop; it takes approximately 16 clock cycles per iteration
+       unsigned long maxloops = microsecondsToClockCycles(timeout)/16;
+
+       unsigned long width = countPulseASM(portInputRegister(port), bit, stateMask, maxloops);
+
+       // prevent clockCyclesToMicroseconds to return bogus values if countPulseASM timed out
+       if (width)
+               return clockCyclesToMicroseconds(width * 16 + 16);
+       else
+               return 0;
+}
+
+/* Measures the length (in microseconds) of a pulse on the pin; state is HIGH
+ * or LOW, the type of pulse to measure.  Works on pulses from 2-3 microseconds
+ * to 3 minutes in length, but must be called at least a few dozen microseconds
+ * before the start of the pulse.
+ *
+ * ATTENTION:
+ * this function relies on micros() so cannot be used in noInterrupt() context
+ */
+unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout)
+{
+       // cache the port and bit of the pin in order to speed up the
+       // pulse width measuring loop and achieve finer resolution.  calling
+       // digitalRead() instead yields much coarser resolution.
+       uint8_t bit = digitalPinToBitMask(pin);
+       uint8_t port = digitalPinToPort(pin);
+       uint8_t stateMask = (state ? bit : 0);
+
+       unsigned long startMicros = micros();
+
+       // wait for any previous pulse to end
+       while ((*portInputRegister(port) & bit) == stateMask) {
+               if (micros() - startMicros > timeout)
+                       return 0;
+       }
+
+       // wait for the pulse to start
+       while ((*portInputRegister(port) & bit) != stateMask) {
+               if (micros() - startMicros > timeout)
+                       return 0;
+       }
+
+       unsigned long start = micros();
+       // wait for the pulse to stop
+       while ((*portInputRegister(port) & bit) == stateMask) {
+               if (micros() - startMicros > timeout)
+                       return 0;
+       }
+       return micros() - start;
+}