Add pulseIn

set baudrate to 2M can't work

Signed-off-by: Bigbits <btx000@qq.com>

cores/arduino/wiring_pulse.c

@@ -0,0 +1,53 @@
+/*
+  Copyright (c) 2011 Arduino.  All right reserved.
+
+  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "Arduino.h"
+#include "wiring_private.h"
+#include "sysctl.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. */
+extern uint32_t pulseIn(uint32_t pin, bool state, uint32_t timeout)
+{
+    uint32_t cpu_freq = sysctl_clock_get_freq(SYSCTL_CLOCK_CPU);
+	uint32_t numloops = 0;
+	uint32_t maxloops = timeout * (cpu_freq / 1000000L) / 16; // microsecondsToClockCycles(timeout) / 16; ???
+	uint32_t start, end;
+	
+	// wait for any previous pulse to end
+	while (digitalRead(pin) == state)
+		if (numloops++ == maxloops)
+			return 0;
+	
+	// wait for the pulse to start
+	while (digitalRead(pin) != state)
+		if (numloops++ == maxloops)
+			return 0;
+	
+	// wait for the pulse to stop
+	start = micros();
+	while (digitalRead(pin) == state)
+		if (numloops++ == maxloops)
+			return 0;
+	end  = micros();
+
+	return (end - start);
+}

cores/arduino/wiring_pulse.h

@@ -0,0 +1,40 @@
+/*
+  Copyright (c) 2011 Arduino.  All right reserved.
+
+  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef _WIRING_PULSE_
+#define _WIRING_PULSE_
+
+#include<stdint.h>
+
+#ifdef __cplusplus
+extern "C"{
+#endif // __cplusplus
+
+/*
+ * \brief 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.
+ */
+extern uint32_t pulseIn(uint32_t ulPin, bool ulState, uint32_t ulTimeout = 1000000L);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus
+
+#endif /* _WIRING_PULSE_ */

platform.txt

@@ -98,5 +98,5 @@ tools.manual_openocd.program.pattern="{path}{cmd}" -d0 -f {program.config} -c "f
 tools.kflash.path={runtime.tools.kflash.path}/
 tools.kflash.cmd={runtime.tools.kflash.path}/kflash
 tools.kflash.bootloader.path={runtime.tools.kflash.path}/bootloader.bin
-tools.kflash.upload.pattern="{cmd}" -p {serial.port} -l "{bootloader.path}" -b 2000000 {build.path}/{build.project_name}.bin
-tools.kflash.program.pattern="{cmd}" -p {serial.port} -l "{bootloader.path}" -b 2000000 {build.path}/{build.project_name}.bin
+tools.kflash.upload.pattern="{cmd}" -p {serial.port} -l "{bootloader.path}" {build.path}/{build.project_name}.bin
+tools.kflash.program.pattern="{cmd}" -p {serial.port} -l "{bootloader.path}" {build.path}/{build.project_name}.bin