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TinyDebugSerial.h
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TinyDebugSerial.h
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/*==============================================================================
TinyDebugSerial.h - Tiny write-only software serial.
Copyright 2010 Rowdy Dog Software.
This file is part of Arduino-Tiny.
Arduino-Tiny 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 3 of the License, or (at your
option) any later version.
Arduino-Tiny 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 Arduino-Tiny. If not, see <http://www.gnu.org/licenses/>.
==============================================================================*/
#ifndef TinyDebugSerial_h
#define TinyDebugSerial_h
#include <inttypes.h>
#include "binary.h"
#include "Stream.h"
class TinyDebugSerialWriter;
class TinyDebugSerial;
class TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
}
virtual void write( uint8_t )
{
}
friend class TinyDebugSerial;
};
void TinyDebugSerialWriterInternalBug( void ) __attribute__((error("Serial (TinyDebugSerial) has an internal problem. Contact the developer.")));
__attribute__((always_inline, unused)) static inline void TinyDebugSerialWriterBangOneByte( uint8_t value, uint8_t SER_REG, uint8_t SER_BIT, uint8_t lom, uint8_t him, uint8_t oloops, uint8_t iloops, uint8_t nops )
{
if ( __builtin_constant_p( SER_REG )
&& __builtin_constant_p( SER_BIT )
&& __builtin_constant_p( lom )
&& __builtin_constant_p( him )
&& __builtin_constant_p( oloops )
&& __builtin_constant_p( iloops )
&& __builtin_constant_p( nops ) )
{
uint8_t i;
uint8_t j;
uint8_t ol;
uint8_t il;
uint8_t b; // Initialized to the low bits
uint8_t hib;
uint8_t m;
b = ((value << 1) & 0x1F);
hib = ((value >> 4) & 0x1F) | 0x10;
asm volatile
(
"ldi %[j], 2" "\n\t"
"ldi %[i], 5" "\n\t"
"ldi %[m], %[lom]" "\n\t"
// Note: 8 MHz, 9600 baud ---> disabling interrupts does not appear to be necessary
"cli" "\n\t"
"rjmp L%=ntop" "\n\t"
"L%=btop: "
"nop" "\n\t" // ---> 7
"nop" "\n\t" //
"nop" "\n\t" //
"nop" "\n\t" //
"nop" "\n\t" //
"nop" "\n\t" //
"nop" "\n\t" //
"L%=ntop: "
"ror %[b]" "\n\t" // ---> 1
"brcs L%=bxh" "\n\t" // 1 (not taken)
"cbi %[serreg], %[serbit]" "\n\t" // 2
"rjmp L%=bxz" "\n\t" // 2
"L%=bxh: " // 2 (taken)
"sbi %[serreg], %[serbit]" "\n\t" // 2
"nop" "\n\t" // 1
// ---> 5
"L%=bxz: "
"ror %[m]" "\n\t" // ---> 3 or 4
"brcc L%=bnoe" "\n\t" //
"nop" "\n\t" //
"nop" "\n\t" //
"L%=bnoe: "
// ---> 1
".if %[oloops] >= 1" "\n\t" // if oloops >= 1 then...
"ldi %[ol], %[oloops]" "\n\t" // 4*oloops + oloops*(3*iloops) or oloops*((3*iloops)+4)
"L%=odelay: " "\n\t"
".endif" "\n\t"
"ldi %[il], %[iloops]" "\n\t" // if oloops == 0 then...
"L%=idelay: " "\n\t" // (3*iloops)
"dec %[il]" "\n\t"
"brne L%=idelay" "\n\t"
"nop" "\n\t"
".if %[oloops] >= 1" "\n\t"
"dec %[ol]" "\n\t"
"brne L%=odelay" "\n\t"
"nop" "\n\t"
".endif" "\n\t"
".if %[nops] >= 1" "\n\t"
"nop" "\n\t" //
".endif" "\n\t"
".if %[nops] >= 2" "\n\t"
"nop" "\n\t" //
".endif" "\n\t"
"dec %[i]" "\n\t" // ---> 3
"brne L%=btop" "\n\t" //
"nop" "\n\t" //
"dec %[j]" "\n\t" // ---> 7
"breq L%=bfin" "\n\t" //
"ldi %[i], 5" "\n\t" //
"mov %[b], %[hib]" "\n\t" //
"ldi %[m], %[him]" "\n\t" //
"rjmp L%=ntop" "\n\t" //
"L%=bfin: "
"sei" "\n\t"
:
[i] "=&r" ( i ),
[j] "=&r" ( j ),
[ol] "=&r" ( ol ),
[il] "=&r" ( il ),
[m] "=&r" ( m )
:
[b] "r" ( b ),
[hib] "r" ( hib ),
[serreg] "I" ( SER_REG ),
[serbit] "M" ( SER_BIT ),
[lom] "M" ( lom ),
[him] "M" ( him ),
[oloops] "M" ( oloops ),
[iloops] "M" ( iloops ),
[nops] "M" ( nops )
:
"r31",
"r30"
);
}
else
{
TinyDebugSerialWriterInternalBug();
}
}
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_1_9600 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B00100, B00010, 0, 28, 2 );
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_1_38400 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B00000, B00000, 0, 2, 0 );
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_1_115200 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
asm volatile
(
"cli" "\n\t"
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- 0 */
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b0h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- st is 9 cycles */
"rjmp L%=b0z" "\n\t" /* 2 */
"L%=b0h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- st is 9 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b0z: "
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b1h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b0 is 8 cycles */
"rjmp L%=b1z" "\n\t" /* 2 */
"L%=b1h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b0 is 8 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b1z: "
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b2h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b1 is 9 cycles */
"rjmp L%=b2z" "\n\t" /* 2 */
"L%=b2h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b1 is 9 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b2z: "
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b3h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b2 is 9 cycles */
"rjmp L%=b3z" "\n\t" /* 2 */
"L%=b3h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b2 is 9 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b3z: "
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b4h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b3 is 8 cycles */
"rjmp L%=b4z" "\n\t" /* 2 */
"L%=b4h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b3 is 8 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b4z: "
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b5h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b4 is 9 cycles */
"rjmp L%=b5z" "\n\t" /* 2 */
"L%=b5h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b4 is 9 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b5z: "
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b6h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b5 is 9 cycles */
"rjmp L%=b6z" "\n\t" /* 2 */
"L%=b6h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b5 is 9 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b6z: "
"ror %[value]" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"brcs L%=b7h" "\n\t" /* 1 (not taken) */
"nop" "\n\t" /* 1 */
"cbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b6 is 8 cycles */
"rjmp L%=b7z" "\n\t" /* 2 */
"L%=b7h: " /* 2 (taken) */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b6 is 8 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"L%=b7z: "
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"sbi %[serreg], %[serbit]" "\n\t" /* 2 <--- b7 is 9 cycles */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
"nop" "\n\t" /* 1 */
/* <---sp is 9 cycles */
"sei" "\n\t"
:
:
[value] "r" ( value ),
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
);
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_8_9600 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B01001, B00100, 3, 89, 0 );
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_8_38400 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B01001, B00100, 0, 62, 2 );
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_8_115200 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B01010, B10100, 0, 16, 1 );
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_16_9600 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B10110, B11011, 6, 90, 2 );
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_16_38400 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B10110, B11011, 5, 25, 1 );
}
};
template
<
uint8_t SER_REG,
uint8_t SER_BIT
>
class TinyDebugSerialWriter_16_115200 : public TinyDebugSerialWriter
{
protected:
virtual void init( void )
{
asm volatile
(
"sbi %[serreg]-1, %[serbit]" "\n\t"
"sbi %[serreg], %[serbit]" "\n\t"
:
:
[serreg] "I" ( SER_REG ),
[serbit] "I" ( SER_BIT )
:
);
}
virtual void write( uint8_t value )
{
TinyDebugSerialWriterBangOneByte( value, SER_REG, SER_BIT, B11110, B11111, 0, 39, 1 );
}
};
#if defined( __AVR_ATtinyX313__ )
#define TINY_DEBUG_SERIAL_REGISTER 0x1B
#define TINY_DEBUG_SERIAL_BIT 1
#elif defined( __AVR_ATtiny84__ )
#if F_CPU <= 8000000L
// port B bit 0 (PB0)
#define TINY_DEBUG_SERIAL_REGISTER 0x18
#define TINY_DEBUG_SERIAL_BIT 0
#else
// port A bit 0 (PA0)
#define TINY_DEBUG_SERIAL_REGISTER 0x1B
#define TINY_DEBUG_SERIAL_BIT 0
#endif
#elif defined( __AVR_ATtiny85__ )
#if F_CPU <= 8000000L
// port B bit 2 (PB2)
#define TINY_DEBUG_SERIAL_REGISTER 0x18
#define TINY_DEBUG_SERIAL_BIT 2
#else
// port B bit 2 (PB2)
#define TINY_DEBUG_SERIAL_REGISTER 0x18
#define TINY_DEBUG_SERIAL_BIT 2
#endif
#endif
#if F_CPU == 1000000L
typedef TinyDebugSerialWriter_1_9600<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_9600;
typedef TinyDebugSerialWriter_1_38400<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_38400;
typedef TinyDebugSerialWriter_1_115200<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_115200;
#define TINY_DEBUG_SERIAL_SUPPORTED 1
#elif F_CPU == 8000000L
typedef TinyDebugSerialWriter_8_9600<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_9600;
typedef TinyDebugSerialWriter_8_38400<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_38400;
typedef TinyDebugSerialWriter_8_115200<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_115200;
#define TINY_DEBUG_SERIAL_SUPPORTED 1
#elif F_CPU == 16000000L
typedef TinyDebugSerialWriter_16_9600<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_9600;
typedef TinyDebugSerialWriter_16_38400<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_38400;
typedef TinyDebugSerialWriter_16_115200<TINY_DEBUG_SERIAL_REGISTER,TINY_DEBUG_SERIAL_BIT> TinyDebugSerialWriter_115200;
#define TINY_DEBUG_SERIAL_SUPPORTED 1
/*
9600...
6, 90, 2
7, 77, 1
38400...
1, 130, 2
5, 25, 1
18, 6, 0
115200...
0, 39, 1
1, 38, 0
2, 18, 2
9, 3, 1
*/
#endif
#if TINY_DEBUG_SERIAL_SUPPORTED
extern TinyDebugSerialWriter_9600 tdsw9600;
extern TinyDebugSerialWriter_38400 tdsw38400;
extern TinyDebugSerialWriter_115200 tdsw115200;
void TinyDebugSerialBadBaud( void ) __attribute__((error("Serial (TinyDebugSerial) supports three baud rates: 9600, 38400, or 115200.")));
void TinyDebugSerialBaudMustBeConstant( void ) __attribute__((error("The baud rate for Serial (TinyDebugSerial) cannot be changed at run-time. Use 9600, 38400, or 115200.")));
class TinyDebugSerial : public Stream
{
protected:
TinyDebugSerialWriter* _writer;
void useStub( void );
public:
TinyDebugSerial( void );
inline void begin( long baud )
{
if ( __builtin_constant_p( baud ) )
{
if ( baud == 9600 )
{
_writer = &tdsw9600;
}
else if ( baud == 38400 )
{
_writer = &tdsw38400;
}
else if ( baud == 115200 )
{
_writer = &tdsw115200;
}
else
{
TinyDebugSerialBadBaud();
}
}
else
{
TinyDebugSerialBaudMustBeConstant();
}
_writer->init();
}
void end( void )
{
useStub();
}
virtual int available( void )
{
return( 0 );
}
virtual int peek( void )
{
return( -1 );
}
virtual int read( void )
{
return( -1 );
}
virtual void flush( void )
{
}
virtual size_t write( uint8_t c )
{
_writer->write( c );
return( 1 );
}
using Print::write; // pull in write(str) and write(buf, size) from Print
};
#if DEFAULT_TO_TINY_DEBUG_SERIAL
extern TinyDebugSerial Serial;
#endif
#endif
#endif