An abstract base class for chattin with floppy drives. More...

#include <Adafruit_Floppy.h>

Inheritance diagram for Adafruit_FloppyBase:

Public Member Functions
bool	begin (void)
	Initializes the GPIO pins but do not start the motor or anything. More...

virtual void	end ()
	Disables floppy communication, allowing pins to be used for general input and output.

virtual void	soft_reset (void)
	Initializes the GPIO pins but do not start the motor or anything.

virtual void	select (bool selected)=0
	Whether to select this drive. More...

virtual bool	spin_motor (bool motor_on)=0
	Turn on or off the floppy motor, if on we wait till we get an index pulse! More...

virtual bool	goto_track (int track_num)=0
	Seek to the desired track, requires the motor to be spun up! More...

virtual bool	side (int head)=0
	Which head/side to read from. More...

virtual int	get_side ()=0
	Current head in use, based on internal caching. More...

virtual int	track (void)=0
	The current track location, based on internal caching. More...

virtual bool	get_write_protect ()=0
	Check whether the floppy in the drive is write protected. More...

virtual bool	get_track0_sense ()=0
	Check whether the track0 sensor is active. More...

virtual bool	get_ready_sense ()=0
	Check whether the ready output is active. More...

virtual bool	set_density (bool high_density)=0
	Set the density for flux reading and writing. More...

size_t	decode_track_mfm (uint8_t sectors, size_t n_sectors, uint8_t sector_validity, const uint8_t pulses, size_t n_pulses, float nominal_bit_time_us, bool clear_validity=false, uint8_t logical_track=nullptr)
	Decode one track of previously captured MFM data. More...

size_t	encode_track_mfm (const uint8_t sectors, size_t n_sectors, uint8_t pulses, size_t max_pulses, float nominal_bit_time_us, uint8_t logical_track)
	Encode one track of previously captured MFM data. More...

size_t	capture_track (volatile uint8_t pulses, size_t max_pulses, int32_t falling_index_offset, bool store_greaseweazle=false, uint32_t capture_ms=0, uint32_t index_wait_ms=250) __attribute__((optimize("O3")))
	Capture one track's worth of flux transitions, between two falling index pulses. More...

bool	write_track (uint8_t *pulses, size_t n_pulses, bool store_greaseweazle=false, bool use_index=true) __attribute__((optimize("O3")))
	Write one track of flux pulse data, starting at the index pulse. More...

void	print_pulse_bins (uint8_t *pulses, size_t n_pulses, uint8_t max_bins=64, bool is_gw_format=false, uint32_t min_bin_size=100)
	Pretty print a simple histogram of flux transitions. More...

void	print_pulses (uint8_t *pulses, size_t n_pulses, bool is_gw_format=false)
	Pretty print the counts in a list of flux transitions. More...

uint32_t	getSampleFrequency (void)
	Get the sample rate that we read and emit pulses at, platform and implementation-dependant. More...

Public Attributes
int8_t	led_pin = -1
	Debug LED output for tracing.

uint16_t	select_delay_us = 10
	delay after drive select (usecs)

uint16_t	step_delay_us = 10000
	delay between head steps (usecs)

uint16_t	settle_delay_ms = 15
	settle delay after seek (msecs)

uint16_t	motor_delay_ms = 1000
	delay after motor on (msecs)

uint16_t	watchdog_delay_ms
	quiescent time until drives reset (msecs) More...

uint8_t	bus_type = BUSTYPE_IBMPC
	what kind of floppy drive we're using

Stream *	debug_serial = nullptr
	optional debug stream for serial output

Protected Member Functions
	Adafruit_FloppyBase (int indexpin, int wrdatapin, int wrgatepin, int rddatapin, bool is_apple2=false)
	Create a hardware interface to a floppy drive. More...

bool	read_index ()
	Poll the status of the index pulse. More...

Detailed Description

An abstract base class for chattin with floppy drives.

Constructor & Destructor Documentation

◆ Adafruit_FloppyBase()

Adafruit_FloppyBase::Adafruit_FloppyBase	(	int	indexpin,
		int	wrdatapin,
		int	wrgatepin,
		int	rddatapin,
		bool	is_apple2 = `false`
	)

protected

Create a hardware interface to a floppy drive.

Parameters

indexpin	A pin connected to the floppy Index Sensor output
wrdatapin	A pin connected to the floppy Write Data input
wrgatepin	A pin connected to the floppy Write Gate input
rddatapin	A pin connected to the floppy Read Data output
is_apple2	True if the flux write waveform is like Apple Disk ][

Member Function Documentation

◆ begin()

bool Adafruit_FloppyBase::begin ( void )

Initializes the GPIO pins but do not start the motor or anything.

Returns: True if able to set up all pins and capture/waveform peripherals

◆ select()

virtual void Adafruit_FloppyBase::select ( bool selected )

pure virtual

Whether to select this drive.

Parameters

selected True to select/enable

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ spin_motor()

virtual bool Adafruit_FloppyBase::spin_motor ( bool motor_on )

pure virtual

Turn on or off the floppy motor, if on we wait till we get an index pulse!

Parameters

motor_on True to turn on motor, False to turn it off

Returns: False if turning motor on and no index pulse found, true otherwise

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ goto_track()

virtual bool Adafruit_FloppyBase::goto_track ( int track_num )

pure virtual

Seek to the desired track, requires the motor to be spun up!

Parameters

track_num The track to step to

Returns: True If we were able to get to the track location

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ side()

virtual bool Adafruit_FloppyBase::side ( int head )

pure virtual

Which head/side to read from.

Parameters

head	Head 0 or 1

Returns: true if the head exists, false otherwise

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ get_side()

virtual int Adafruit_FloppyBase::get_side ( )

pure virtual

Current head in use, based on internal caching.

Returns: Head 0 or 1

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ track()

virtual int Adafruit_FloppyBase::track ( void )

pure virtual

The current track location, based on internal caching.

Returns: The cached track location

Note: Returns -1 if the track is not known.

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ get_write_protect()

virtual bool Adafruit_FloppyBase::get_write_protect ( )

pure virtual

Check whether the floppy in the drive is write protected.

Returns: False if the floppy is writable, true otherwise

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ get_track0_sense()

virtual bool Adafruit_FloppyBase::get_track0_sense ( )

pure virtual

Check whether the track0 sensor is active.

Returns: True if the track0 sensor is active, false otherwise

Note: On devices without a track0 sensor, this returns true when track()==0

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ get_ready_sense()

virtual bool Adafruit_FloppyBase::get_ready_sense ( )

pure virtual

Check whether the ready output is active.

Returns: True if the ready sensor is active, false otherwise

Note: On devices without a ready sensor, this always returns true

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ set_density()

virtual bool Adafruit_FloppyBase::set_density ( bool high_density )

pure virtual

Set the density for flux reading and writing.

Parameters

high_density false for low density, true for high density

Returns: True if the drive interface supports the given density.

Implemented in Adafruit_Apple2Floppy, and Adafruit_Floppy.

◆ decode_track_mfm()

size_t Adafruit_FloppyBase::decode_track_mfm	(	uint8_t *	sectors,
		size_t	n_sectors,
		uint8_t *	sector_validity,
		const uint8_t *	pulses,
		size_t	n_pulses,
		float	nominal_bit_time_us,
		bool	clear_validity = `false`,
		uint8_t *	logical_track = `nullptr`
	)

Decode one track of previously captured MFM data.

Parameters

sectors	A pointer to an array of memory we can use to store into, 512*n_sectors bytes
n_sectors	The number of sectors (e.g., 18 for a standard 3.5", 1.44MB format)
sector_validity	An array of values set to 1 if the sector was captured, 0 if not captured (no IDAM, CRC error, etc)
pulses	An array of pulses from capture_track
n_pulses	An array of pulses from capture_track
nominal_bit_time_us	The nominal time of one MFM bit, usually 1.0f (double density) or 2.0f (high density)
clear_validity	Whether to clear the validity flag. Set to false if re-reading a track with errors.
logical_track	If not NULL, updated with the logical track number of the last sector read. (track & side numbers are not otherwise verified)

Returns: Number of sectors we actually captured

◆ encode_track_mfm()

size_t Adafruit_FloppyBase::encode_track_mfm	(	const uint8_t *	sectors,
		size_t	n_sectors,
		uint8_t *	pulses,
		size_t	max_pulses,
		float	nominal_bit_time_us,
		uint8_t	logical_track
	)

Encode one track of previously captured MFM data.

Parameters

sectors	A pointer to an array of memory we can use to store into, 512*n_sectors bytes
n_sectors	The number of sectors (e.g., 18 for a standard 3.5", 1.44MB format)
pulses	An array of pulses from capture_track
max_pulses	The maximum number of pulses that may be stored
nominal_bit_time_us	The nominal time of one MFM bit, usually 1.0f (double density) or 2.0f (high density)
logical_track	The logical track number, or -1 to use track()

Returns: Number of pulses actually generated

◆ capture_track()

size_t Adafruit_FloppyBase::capture_track	(	volatile uint8_t *	pulses,
		size_t	max_pulses,
		int32_t *	falling_index_offset,
		bool	store_greaseweazle = `false`,
		uint32_t	capture_ms = `0`,
		uint32_t	index_wait_ms = `250`
	)

Capture one track's worth of flux transitions, between two falling index pulses.

Parameters

pulses	A pointer to an array of memory we can use to store into
max_pulses	The size of the allocated pulses array
falling_index_offset	Pointer to a uint32_t where we will store the "flux index" where the second index pulse fell. usually we read 110-125% of one track so there is an overlap of index pulse reads
store_greaseweazle	Pass in true to pack long pulses with two bytes
capture_ms	If not zero, we will capture at least one revolution and extra time will be determined by this variable. e.g. 250ms means one revolution plus about 50 ms post-index
index_wait_ms	If not zero, wait at most this many ms for an index pulse to arrive

Returns: Number of pulses we actually captured

◆ write_track()

bool Adafruit_FloppyBase::write_track	(	uint8_t *	pulses,
		size_t	n_pulses,
		bool	store_greaseweazle = `false`,
		bool	use_index = `true`
	)

Write one track of flux pulse data, starting at the index pulse.

Parameters

pulses	An array of timer-count pulses
n_pulses	How many bytes are in the pulse array
store_greaseweazle	If true, long pulses are 'packed' in gw format
use_index	If true, write starts at the index pulse.

Returns: False if the data could not be written (samd51 cannot write apple flux format)

◆ print_pulse_bins()

void Adafruit_FloppyBase::print_pulse_bins	(	uint8_t *	pulses,
		size_t	n_pulses,
		uint8_t	max_bins = `64`,
		bool	is_gw_format = `false`,
		uint32_t	min_bin_size = `100`
	)

Pretty print a simple histogram of flux transitions.

Parameters

pulses	A pointer to an array of memory containing pulse counts
n_pulses	The size of the pulses in the array
max_bins	The maximum number of histogram bins to use (default 64)
is_gw_format	Set to true if we pack long pulses with two bytes
min_bin_size	Bins with fewer samples than this are skipped, not printed

◆ print_pulses()

void Adafruit_FloppyBase::print_pulses	(	uint8_t *	pulses,
		size_t	n_pulses,
		bool	is_gw_format = `false`
	)

Pretty print the counts in a list of flux transitions.

Parameters

pulses	A pointer to an array of memory containing pulse counts
n_pulses	The size of the pulses in the array
is_gw_format	Set to true if we pack long pulses with two bytes

◆ getSampleFrequency()

uint32_t Adafruit_FloppyBase::getSampleFrequency ( void )

Get the sample rate that we read and emit pulses at, platform and implementation-dependant.

Returns: Sample frequency in Hz, or 0 if not known

◆ read_index()

bool Adafruit_FloppyBase::read_index ( )

protected

Poll the status of the index pulse.

Returns: the status of the index pulse

Member Data Documentation

◆ watchdog_delay_ms

uint16_t Adafruit_FloppyBase::watchdog_delay_ms

Initial value:

=

1000

quiescent time until drives reset (msecs)

The documentation for this class was generated from the following files:

src/Adafruit_Floppy.h
src/Adafruit_Floppy.cpp

Public Member Functions

Public Attributes

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ Adafruit_FloppyBase()

Member Function Documentation

◆ begin()

◆ select()

◆ spin_motor()

◆ goto_track()

◆ side()

◆ get_side()

◆ track()

◆ get_write_protect()

◆ get_track0_sense()

◆ get_ready_sense()

◆ set_density()

◆ decode_track_mfm()

◆ encode_track_mfm()

◆ capture_track()

◆ write_track()

◆ print_pulse_bins()

◆ print_pulses()

◆ getSampleFrequency()

◆ read_index()

Member Data Documentation

◆ watchdog_delay_ms