Drop analogReadFast (see DCCTimer)

AnalogRead speed set in DCCTimer for ease of porting.
Code tidy and diagnostics in MotorDriver

AnalogReadFast.h

@@ -1,46 +0,0 @@
-/*
- *  AnalogReadFast.h
- * 
- *  Copyright (C) 2016  Albert van Dalen http://www.avdweb.nl
- * 
- *  This file is part of CommandStation.
- *
- *  CommandStation is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  (at your option) any later version.
- *
- *  CommandStation 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 General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with CommandStation.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-#ifndef COMMANDSTATION_DCC_ANALOGREADFAST_H_
-#define COMMANDSTATION_DCC_ANALOGREADFAST_H_
-
-#include <Arduino.h>
-
-int inline analogReadFast(uint8_t ADCpin);
-#if defined(ARDUINO_ARCH_MEGAAVR)
-
-int inline analogReadFast(uint8_t ADCpin) 
-{ byte ADC0CTRLCoriginal = ADC0.CTRLC; 
-  ADC0.CTRLC = (ADC0CTRLCoriginal & 0b00110000) + 0b01000011; 
-  int adc = analogRead(ADCpin);  
-  ADC0.CTRLC = ADC0CTRLCoriginal;
-  return adc;
-}
-#else 
-int inline analogReadFast(uint8_t ADCpin) 
-{ byte ADCSRAoriginal = ADCSRA; 
-  ADCSRA = (ADCSRA & B11111000) | 4; 
-  int adc = analogRead(ADCpin);  
-  ADCSRA = ADCSRAoriginal;
-  return adc;
-}
-#endif
-#endif  // COMMANDSTATION_DCC_ANALOGREADFAST_H_

DCCTimer.cpp

@@ -38,6 +38,7 @@ INTERRUPT_CALLBACK interruptHandler=0;
   void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
     interruptHandler=callback;
     noInterrupts(); 
+    ADC0.CTRLC = (ADC0.CTRLC & 0b00110000) | 0b01000011;  // speed up analogRead sample time   
     TCB0.CTRLB = TCB_CNTMODE_INT_gc & ~TCB_CCMPEN_bm; // timer compare mode with output disabled
     TCB0.CTRLA = TCB_CLKSEL_CLKDIV2_gc; //   8 MHz ~ 0.125 us      
     TCB0.CCMP =  CLOCK_CYCLES -1;  // 1 tick less for timer reset 
@@ -59,6 +60,7 @@ INTERRUPT_CALLBACK interruptHandler=0;
   void DCCTimer::begin(INTERRUPT_CALLBACK callback) {
     interruptHandler=callback;
     noInterrupts(); 
+    ADCSRA = (ADCSRA & 0b11111000) | 0b00000100;   // speed up analogRead sample time 
     TCCR1A = 0;
     ICR1 = CLOCK_CYCLES;
     TCNT1 = 0;   

MotorDriver.cpp

@@ -18,7 +18,6 @@
  */
 #include <Arduino.h>
 #include "MotorDriver.h"
-#include "AnalogReadFast.h"
 #include "DIAG.h"
 
 #define setHIGH(fastpin)  *fastpin.out |= fastpin.maskHIGH
@@ -27,29 +26,36 @@
 MotorDriver::MotorDriver(byte power_pin, byte signal_pin, byte signal_pin2, int8_t brake_pin,
                          byte current_pin, float sense_factor, unsigned int trip_milliamps, byte fault_pin) {
   powerPin=power_pin;
+  pinMode(powerPin, OUTPUT);
+  
   signalPin=signal_pin;
-  getFastPin(signalPin,fastSignalPin);
+  getFastPin(F("SIG"),signalPin,fastSignalPin);
+  pinMode(signalPin, OUTPUT);
+  
   signalPin2=signal_pin2;
   if (signalPin2!=UNUSED_PIN) {
     dualSignal=true;
-    getFastPin(signalPin2,fastSignalPin2);
+    getFastPin(F("SIG2"),signalPin2,fastSignalPin2);
+    pinMode(signalPin2, OUTPUT);
   }
   else dualSignal=false; 
   
   brakePin=brake_pin;
+  if (brakePin!=UNUSED_PIN){
+    pinMode(brakePin < 0 ? -brakePin : brakePin, OUTPUT);
+    setBrake(false);
+  }
+  
   currentPin=current_pin;
-  senseFactor=sense_factor;
+  pinMode(currentPin, INPUT);
+
   faultPin=fault_pin;
+  if (faultPin != UNUSED_PIN) pinMode(faultPin, INPUT);
+
+  senseFactor=sense_factor;
   tripMilliamps=trip_milliamps;
   rawCurrentTripValue=(int)(trip_milliamps / sense_factor);
   simulatedOverload=(int)(32000/senseFactor);
-  pinMode(powerPin, OUTPUT);
-  pinMode(brakePin < 0 ? -brakePin : brakePin, OUTPUT);
-  setBrake(false);
-  pinMode(signalPin, OUTPUT);
-  if (signalPin2 != UNUSED_PIN) pinMode(signalPin2, OUTPUT);
-  pinMode(currentPin, INPUT);
-  if (faultPin != UNUSED_PIN) pinMode(faultPin, INPUT);
 }
 
 void MotorDriver::setPower(bool on) {
@@ -98,8 +104,8 @@ int MotorDriver::getCurrentRaw() {
   
   // IMPORTANT:  This function can be called in Interrupt() time within the 56uS timer
   //             The default analogRead takes ~100uS which is catastrphic
-  //             so analogReadFast is used here. (-2uS) 
-  return analogReadFast(currentPin);
+  //             so DCCTimer has set the sample time to be much faster.  
+  return analogRead(currentPin);
 }
 
 unsigned int MotorDriver::raw2mA( int raw) {
@@ -109,8 +115,8 @@ int MotorDriver::mA2raw( unsigned int mA) {
   return (int)(mA / senseFactor);
 }
 
-void  MotorDriver::getFastPin(int pin, FASTPIN & result) {
-    DIAG(F("\nMotorDriver Pin=%d,"),pin);
+void  MotorDriver::getFastPin(const FSH* type,int pin, FASTPIN & result) {
+    DIAG(F("\nMotorDriver %S Pin=%d,"),type,pin);
     uint8_t port = digitalPinToPort(pin);
     result.out = portOutputRegister(port);
     result.maskHIGH = digitalPinToBitMask(pin);

MotorDriver.h

@@ -18,6 +18,8 @@
  */
 #ifndef MotorDriver_h
 #define MotorDriver_h
+#include "FSH.h"
+
 // Virtualised Motor shield 1-track hardware Interface
 
 #ifndef UNUSED_PIN     // sync define with the one in MotorDrivers.h
@@ -44,7 +46,7 @@ class MotorDriver {
     }
 
   private:
-    void  getFastPin(int pin, FASTPIN & result);
+    void  getFastPin(const FSH* type,int pin, FASTPIN & result);
     byte powerPin, signalPin, signalPin2, currentPin, faultPin;
     FASTPIN fastSignalPin, fastSignalPin2;
     bool dualSignal;       // true to use signalPin2