Port pulseIn to new architecture

The asm part doesn't change, so the only needed functions were a corrected microsecondsToClockCycles and portInputRegister

Author: facchinm

cores/arduino/Arduino.h

@@ -80,8 +80,8 @@ extern uint32_t F_CPU_CORRECTED;
 
 uint16_t clockCyclesPerMicrosecondComp(uint32_t clk);
 uint16_t clockCyclesPerMicrosecond();
-uint16_t clockCyclesToMicroseconds(uint16_t cycles);
-uint32_t microsecondsToClockCycles(uint16_t microseconds);
+unsigned long clockCyclesToMicroseconds(unsigned long cycles);
+unsigned long microsecondsToClockCycles(unsigned long microseconds);
 
 // Get the bit location within the hardware port of the given virtual pin.
 // This comes from the pins_*.c file for the active board configuration.

cores/arduino/wiring.c

@@ -58,11 +58,11 @@ inline uint16_t clockCyclesPerMicrosecond(){
 	return clockCyclesPerMicrosecondComp(F_CPU_CORRECTED);
 }
 
-inline uint16_t clockCyclesToMicroseconds(uint16_t cycles){
+inline unsigned long clockCyclesToMicroseconds(unsigned long cycles){
 	return ( cycles / clockCyclesPerMicrosecond() );
 }
 
-inline uint32_t microsecondsToClockCycles(uint16_t microseconds){
+inline unsigned long microsecondsToClockCycles(unsigned long microseconds){
 	return ( microseconds * clockCyclesPerMicrosecond() );
 }
 

cores/arduino/wiring_pulse.c

@@ -23,10 +23,6 @@
 #include "wiring_private.h"
 #include "pins_arduino.h"
 
-// TODO: port to 4809
-
-#if 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
@@ -45,7 +41,7 @@ unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout)
 
 	// 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, F_CPU)/16;
+	unsigned long maxloops = microsecondsToClockCycles(timeout)/12;
 
 	unsigned long width = countPulseASM(portInputRegister(port), bit, stateMask, maxloops);
 
@@ -94,6 +90,4 @@ unsigned long pulseInLong(uint8_t pin, uint8_t state, unsigned long timeout)
 			return 0;
 	}
 	return micros() - start;
-}
-
-#endif
+}