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Compiles for AVR and Teensy (Arm) without modifications
This commit is contained in:
MicroBahner
2016-01-03 14:17:02 +01:00
parent 3a293152fc
commit d47795e54a
2 changed files with 294 additions and 73 deletions
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349
NmraDcc.cpp
View File

@@ -19,6 +19,7 @@
// 2015-11-06 Martin Pischky (martin@pischky.de):
// Experimental Version to support 14 speed steps
// and new signature of notifyDccSpeed and notifyDccFunc
// 2015-12-16 Version without use of Timer0 by Franz-Peter Müller
//
//------------------------------------------------------------------------
//
@@ -50,21 +51,149 @@
// |----------->|
// ^Timer-INT: reads one
//
// new DCC Receive Routine without Timer0 ........................................................
//
// Howto: uses only one interrupt at the rising or falling edge of the DCC signal
// The time between two edges is measured to determine the bit value
// Synchronising to the edge of the first part of a bit is done after recognizing the start bit
// During synchronizing each part of a bit is detected ( Interruptmode 'change' )
//
// |<-----116us----->|
// DCC 1: _________XXXXXXXXX_________XXXXXXXXX_________
// |<--------138us------>|
// ^-INTx ^-INTx
// less than 138us: its a one-Bit
//
//
// |<-----------------232us----------->|
// DCC 0: _________XXXXXXXXXXXXXXXXXX__________________XXXXXXXX__________
// |<--------138us------->|
// ^-INTx ^-INTx
// greater than 138us: its a zero bit
//
//
//
//
//------------------------------------------------------------------------
#define MAX_ONEBITFULL 146
#define MAX_PRAEAMBEL 146 //138
#define MAX_ONEBITHALF 82
// The Timer0 prescaler is hard-coded in wiring.c
#define TIMER_PRESCALER 64
// Debug-Ports
//#define debug // Testpulse for logic analyser
#ifdef debug
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
#define MODE_TP1 DDRF |= (1<<2) //pinA2
#define SET_TP1 PORTF |= (1<<2)
#define CLR_TP1 PORTF &= ~(1<<2)
#define MODE_TP2 DDRF |= (1<<3) //pinA3
#define SET_TP2 PORTF |= (1<<3)
#define CLR_TP2 PORTF &= ~(1<<3)
#define MODE_TP3 DDRF |= (1<<4) //pinA4
#define SET_TP3 PORTF |= (1<<4)
#define CLR_TP3 PORTF &= ~(1<<4)
#define MODE_TP4 DDRF |= (1<<5) //pinA5
#define SET_TP4 PORTF |= (1<<5)
#define CLR_TP4 PORTF &= ~(1<<5)
#elif defined(__AVR_ATmega32U4__)
#define MODE_TP1 DDRF |= (1<<4) //A3
#define SET_TP1 PORTF |= (1<<4)
#define CLR_TP1 PORTF &= ~(1<<4)
#define MODE_TP2 DDRF |= (1<<5) //A2
#define SET_TP2 PORTF |= (1<<5)
#define CLR_TP2 PORTF &= ~(1<<5)
#define MODE_TP3
#define SET_TP3
#define CLR_TP3
#define MODE_TP4
#define SET_TP4
#define CLR_TP4
#elif defined(__AVR_ATmega328P__)
#define MODE_TP1 DDRC |= (1<<1) //A1
#define SET_TP1 PORTC |= (1<<1)
#define CLR_TP1 PORTC &= ~(1<<1)
#define MODE_TP2 DDRC |= (1<<2) // A2
#define SET_TP2 PORTC |= (1<<2)
#define CLR_TP2 PORTC &= ~(1<<2)
#define MODE_TP3 DDRC |= (1<<3) //A3
#define SET_TP3 PORTC |= (1<<3)
#define CLR_TP3 PORTC &= ~(1<<3)
#define MODE_TP4 DDRC |= (1<<4) //A4
#define SET_TP4 PORTC |= (1<<4)
#define CLR_TP4 PORTC &= ~(1<<4)
#elif defined(__arm__) && (defined(__MK20DX128__) || defined(__MK20DX256__))
// Teensys 3.x
#define MODE_TP1 pinMode( A1,OUTPUT ) // A1= PortC, Bit0
#define SET_TP1 GPIOC_PSOR = 0x01
#define CLR_TP1 GPIOC_PCOR = 0x01
#define MODE_TP2 pinMode( A2,OUTPUT ) // A2= PortB Bit0
#define SET_TP2 GPIOB_PSOR = 0x01
#define CLR_TP2 GPIOB_PCOR = 0x01
#define MODE_TP3 pinMode( A3,OUTPUT ) // A3 = PortB Bit1
#define SET_TP3 GPIOB_PSOR = 0x02
#define CLR_TP3 GPIOB_PCOR = 0x02
#define MODE_TP4 pinMode( A4,OUTPUT ) // A4 = PortB Bit3
#define SET_TP4 GPIOB_PSOR = 0x08
#define CLR_TP4 GPIOB_PCOR = 0x08
#elif defined (__SAM3X8E__)
// Arduino Due
#define MODE_TP1 pinMode( A1,OUTPUT ) // A1= PA24
#define SET_TP1 REG_PIOA_SODR = (1<<24)
#define CLR_TP1 REG_PIOA_CODR = (1<<24)
#define MODE_TP2 pinMode( A2,OUTPUT ) // A2= PA23
#define SET_TP2 REG_PIOA_SODR = (1<<23)
#define CLR_TP2 REG_PIOA_CODR = (1<<23)
#define MODE_TP3 pinMode( A3,OUTPUT ) // A3 = PA22
#define SET_TP3 REG_PIOA_SODR = (1<<22)
#define CLR_TP3 REG_PIOA_CODR = (1<<22)
#define MODE_TP4 pinMode( A4,OUTPUT ) // A4 = PA6
#define SET_TP4 REG_PIOA_SODR = (1<<6)
#define CLR_TP4 REG_PIOA_CODR = (1<<6)
// We will use a time period of 80us and not 87us as this gives us a bit more time to do other stuff
#define DCC_BIT_SAMPLE_PERIOD (F_CPU * 70L / TIMER_PRESCALER / 1000000L)
//#elif defined(__AVR_ATmega128__) ||defined(__AVR_ATmega1281__)||defined(__AVR_ATmega2561__)
#else
#define MODE_TP1
#define SET_TP1
#define CLR_TP1
#define MODE_TP2
#define SET_TP2
#define CLR_TP2
#define MODE_TP3
#define SET_TP3
#define CLR_TP3
#define MODE_TP4
#define SET_TP4
#define CLR_TP4
#endif
#else
#define MODE_TP1
#define SET_TP1
#define CLR_TP1
#define MODE_TP2
#define SET_TP2
#define CLR_TP2
//#define MODE_TP2 DDRC |= (1<<2) // A2
//#define SET_TP2 PORTC |= (1<<2)
//#define CLR_TP2 PORTC &= ~(1<<2)
#define MODE_TP3
#define SET_TP3
#define CLR_TP3
#define MODE_TP4
#define SET_TP4
#define CLR_TP4
//#define MODE_TP4 DDRC |= (1<<4) //A4
//#define SET_TP4 PORTC |= (1<<4)
//#define CLR_TP4 PORTC &= ~(1<<4)
#if (DCC_BIT_SAMPLE_PERIOD > 254)
#error DCC_BIT_SAMPLE_PERIOD too big, use either larger prescaler or slower processor
#endif
#if (DCC_BIT_SAMPLE_PERIOD < 8)
#error DCC_BIT_SAMPLE_PERIOD too small, use either smaller prescaler or faster processor
#ifdef DCC_DBGVAR
struct countOf_t countOf;
#endif
static byte ISREdge; // RISING or FALLING
static word bitMax;
typedef enum
{
WAIT_PREAMBLE = 0,
@@ -107,71 +236,138 @@ DCC_PROCESSOR_STATE DccProcState ;
void ExternalInterruptHandler(void)
{
OCR0B = TCNT0 + DCC_BIT_SAMPLE_PERIOD ;
#if defined(TIMSK0)
TIMSK0 |= (1<<OCIE0B); // Enable Timer0 Compare Match B Interrupt
TIFR0 |= (1<<OCF0B); // Clear Timer0 Compare Match B Flag
#elif defined(TIMSK)
TIMSK |= (1<<OCIE0B); // Enable Timer0 Compare Match B Interrupt
TIFR |= (1<<OCF0B); // Clear Timer0 Compare Match B Flag
#endif
#ifdef DCC_DEBUG
DccProcState.IntCount++;
#endif
}
ISR(TIMER0_COMPB_vect)
{
uint8_t DccBitVal ;
// Read the DCC input value, if it's low then its a 1 bit, otherwise it is a 0 bit
DccBitVal = !digitalRead(DccProcState.ExtIntPinNum) ;
// Disable Timer0 Compare Match B Interrupt
#if defined(TIMSK0)
TIMSK0 &= ~(1<<OCIE0B);
#elif defined(TIMSK)
TIMSK &= ~(1<<OCIE0B);
#endif
// Bit evaluation without Timer 0 ------------------------------
uint8_t DccBitVal;
static int8_t bit1, bit2 ;
static word lastMicros;
static byte halfBit;
unsigned int actMicros, bitMicros;
SET_TP3;
actMicros = micros();
bitMicros = actMicros-lastMicros;
DccBitVal = ( bitMicros < bitMax );
lastMicros = actMicros;
//#ifdef debug
if(DccBitVal) SET_TP2; else CLR_TP2;
//#endif
sei(); // time critical is only the micros() command,so allow nested irq's
#ifdef DCC_DEBUG
DccProcState.TickCount++;
#endif
DccRx.BitCount++;
switch( DccRx.State )
{
case WAIT_PREAMBLE:
if( DccBitVal )
{
if( DccRx.BitCount > 10 )
SET_TP1;
DccRx.BitCount++;
if( DccRx.BitCount > 10 ) {
DccRx.State = WAIT_START_BIT ;
// While waiting for the start bit, detect halfbit lengths. We will detect the correct
// sync and detect whether we see a false (e.g. motorola) protocol
attachInterrupt( DccProcState.ExtIntNum, ExternalInterruptHandler, CHANGE);
halfBit = 0;
bitMax = MAX_ONEBITHALF;
CLR_TP1;
}
} else {
SET_TP1;
DccRx.BitCount = 0 ;
CLR_TP1;
}
else
DccRx.BitCount = 0 ;
break;
case WAIT_START_BIT:
if( !DccBitVal )
{
DccRx.State = WAIT_DATA ;
DccRx.PacketBuf.Size = 0;
DccRx.PacketBuf.PreambleBits = 0;
for(uint8_t i = 0; i< MAX_DCC_MESSAGE_LEN; i++ )
DccRx.PacketBuf.Data[i] = 0;
// we are looking for first half "0" bit after preamble
switch ( halfBit ) {
case 0: //SET_TP1;
// check first part
if ( DccBitVal ) {
// is still 1-bit (Preamble)
halfBit=1;
bit1=bitMicros;
} else {
// was "0" half bit, maybe the startbit
halfBit = 4;
}
break;
case 1: //SET_TP1; // previous halfbit was '1'
if ( DccBitVal ) {
CLR_TP1;
// its a '1' halfBit -> we are still in the preamble
halfBit = 0;
bit2=bitMicros;
DccRx.BitCount++;
if( abs(bit2-bit1) > 14 ) {
// the length of the 2 halbits differ too much -> wrong protokoll
CLR_TP2;
CLR_TP3;
DccRx.State = WAIT_PREAMBLE;
bitMax = MAX_PRAEAMBEL;
DccRx.BitCount = 0;
attachInterrupt( DccProcState.ExtIntNum, ExternalInterruptHandler, ISREdge );
SET_TP3;
}
} else {
// first '0' half detected in second halfBit
// wrong sync or not a DCC protokoll
halfBit = 3;
}
break;
case 3: //SET_TP1; // previous halfbit was '0' in second halfbit
if ( DccBitVal ) {
// its a '1' halfbit -> we got only a half '0' bit -> cannot be DCC
DccRx.State = WAIT_PREAMBLE;
bitMax = MAX_PRAEAMBEL;
DccRx.BitCount = 0;
} else {
// we got two '0' halfbits -> it's the startbit
// but sync is NOT ok, change IRQ edge.
if ( ISREdge == RISING ) ISREdge = FALLING; else ISREdge = RISING;
DccRx.State = WAIT_DATA ;
bitMax = MAX_ONEBITFULL;
DccRx.PacketBuf.Size = 0;
DccRx.PacketBuf.PreambleBits = 0;
for(uint8_t i = 0; i< MAX_DCC_MESSAGE_LEN; i++ )
DccRx.PacketBuf.Data[i] = 0;
// We now have 1 too many PreambleBits so decrement before copying
DccRx.PacketBuf.PreambleBits = DccRx.BitCount - 1 ;
DccRx.PacketBuf.PreambleBits = DccRx.BitCount;
DccRx.BitCount = 0 ;
DccRx.TempByte = 0 ;
}
attachInterrupt( DccProcState.ExtIntNum, ExternalInterruptHandler, ISREdge );
CLR_TP1;
break;
case 4: SET_TP1; // previous (first) halfbit was 0
// if this halfbit is 0 too, we got the startbit
if ( DccBitVal ) {
// second halfbit is 1 -> unknown protokoll
DccRx.State = WAIT_PREAMBLE;
bitMax = MAX_PRAEAMBEL;
DccRx.BitCount = 0;
} else {
// we got the startbit
DccRx.State = WAIT_DATA ;
bitMax = MAX_ONEBITFULL;
DccRx.PacketBuf.Size = 0;
DccRx.PacketBuf.PreambleBits = 0;
for(uint8_t i = 0; i< MAX_DCC_MESSAGE_LEN; i++ )
DccRx.PacketBuf.Data[i] = 0;
DccRx.PacketBuf.PreambleBits = DccRx.BitCount;
DccRx.BitCount = 0 ;
DccRx.TempByte = 0 ;
}
attachInterrupt( DccProcState.ExtIntNum, ExternalInterruptHandler, ISREdge );
CLR_TP1;
break;
DccRx.BitCount = 0 ;
DccRx.TempByte = 0 ;
}
break;
case WAIT_DATA:
DccRx.BitCount++;
DccRx.TempByte = ( DccRx.TempByte << 1 ) ;
if( DccBitVal )
DccRx.TempByte |= 1 ;
@@ -181,6 +377,7 @@ ISR(TIMER0_COMPB_vect)
if( DccRx.PacketBuf.Size == MAX_DCC_MESSAGE_LEN ) // Packet is too long - abort
{
DccRx.State = WAIT_PREAMBLE ;
bitMax = MAX_PRAEAMBEL;
DccRx.BitCount = 0 ;
}
else
@@ -192,11 +389,15 @@ ISR(TIMER0_COMPB_vect)
break;
case WAIT_END_BIT:
DccRx.BitCount++;
if( DccBitVal ) // End of packet?
{
CLR_TP3;
DccRx.State = WAIT_PREAMBLE ;
bitMax = MAX_PRAEAMBEL;
DccRx.PacketCopy = DccRx.PacketBuf ;
DccRx.DataReady = 1 ;
SET_TP3;
}
else // Get next Byte
DccRx.State = WAIT_DATA ;
@@ -204,6 +405,8 @@ ISR(TIMER0_COMPB_vect)
DccRx.BitCount = 0 ;
DccRx.TempByte = 0 ;
}
CLR_TP1;
CLR_TP3;
}
void ackCV(void)
@@ -231,7 +434,7 @@ uint8_t validCV( uint16_t CV, uint8_t Writable )
return Valid ;
}
uint8_t readCV( uint16_t CV )
uint8_t readCV( unsigned int CV )
{
uint8_t Value ;
@@ -243,7 +446,7 @@ uint8_t readCV( uint16_t CV )
return Value ;
}
uint8_t writeCV( uint16_t CV, uint8_t Value)
uint8_t writeCV( unsigned int CV, uint8_t Value)
{
if( notifyCVWrite )
return notifyCVWrite( CV, Value ) ;
@@ -255,7 +458,6 @@ uint8_t writeCV( uint16_t CV, uint8_t Value)
if( notifyCVChange )
notifyCVChange( CV, Value) ;
}
return eeprom_read_byte( (uint8_t*) CV ) ;
}
@@ -733,12 +935,12 @@ void NmraDcc::init( uint8_t ManufacturerId, uint8_t VersionId, uint8_t Flags, ui
// Clear all the static member variables
memset( &DccRx, 0, sizeof( DccRx) );
#ifdef TCCR0A
// Change Timer0 Waveform Generation Mode from Fast PWM back to Normal Mode
TCCR0A &= ~((1<<WGM01)|(1<<WGM00));
#else
#error NmraDcc Library requires a processor with Timer0 Output Compare B feature
#endif
MODE_TP1; // only for debugging and timing measurement
MODE_TP2;
MODE_TP3;
MODE_TP4;
ISREdge = RISING;
bitMax = MAX_ONEBITFULL;
attachInterrupt( DccProcState.ExtIntNum, ExternalInterruptHandler, RISING);
DccProcState.Flags = Flags ;
@@ -814,24 +1016,33 @@ uint8_t NmraDcc::process()
if( DccRx.DataReady )
{
// We need to do this check with interrupts disabled
//SET_TP4;
cli();
Msg = DccRx.PacketCopy ;
DccRx.DataReady = 0 ;
sei();
#ifdef DCC_DBGVAR
countOf.Tel++;
#endif
uint8_t xorValue = 0 ;
for(uint8_t i = 0; i < DccRx.PacketCopy.Size; i++)
xorValue ^= DccRx.PacketCopy.Data[i];
if(xorValue)
//CLR_TP4;
if(xorValue) {
SET_TP4;
#ifdef DCC_DBGVAR
countOf.Err++;
#endif
CLR_TP4;
return 0 ;
else
{
if( notifyDccMsg )
notifyDccMsg( &Msg );
} else {
//SET_TP4;
if( notifyDccMsg ) notifyDccMsg( &Msg );
execDccProcessor( &Msg );
execDccProcessor( &Msg );
//CLR_TP4;
}
return 1 ;
}

12
NmraDcc.h
View File

@@ -34,7 +34,7 @@
#define NMRA_DCC_PROCESS_MULTIFUNCTION
// Uncomment the following line to Enable 14 Speed Step Support
//#define NMRA_DCC_ENABLE_14_SPEED_STEP_MODE
#define NMRA_DCC_ENABLE_14_SPEED_STEP_MODE
#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
@@ -166,6 +166,16 @@ typedef enum
#define FN_BIT_27 0x40
#define FN_BIT_28 0x80
#define DCC_DBGVAR
#ifdef DCC_DBGVAR
typedef struct countOf_t {
unsigned long Tel;
unsigned long Err;
}countOf_t ;
extern struct countOf_t countOf;
#endif
class NmraDcc
{
private: