babyhas.blogg.se - Sd floppy disk emulator industrial

#SD FLOPPY DISK EMULATOR INDUSTRIAL SERIAL#
#SD FLOPPY DISK EMULATOR INDUSTRIAL PC#

fddEMU looks for a boot record on "sector 0" of the image.

u8glib Very useful for incorporating SSD1306 and can easily be used with various displays.

/avrc-sd-interface Great tutorial for using SD card with AVR.

Petit FAT FS by Chan adapted for hardware SPI by Bill Greiman.

fddEMU uses a modified ArduinoFDC library renamed to avrFlux for communicating with FDC.

If mcu (arduino) can't access SD card after reset remove the sd card, wait a few seconds, reinsert the SD card then reset the arduino. To protect the screen currently a watchdog timer of 8 seconds is set (which is the longest duration for watchdog timer).

If read data pin (D8) is disconnected or does not have sufficient external pullup fddEMU might hang up while reading data from host, which might cause a static image on screen.

#SD FLOPPY DISK EMULATOR INDUSTRIAL PC#

Requires a Floppy Drive Controller (FDC) on the PC side to communicate so it probably wont work with an Amiga.

fddEMU supports fixed sector size of 512 bytes, other sector sizes are not supported.

Converts raw image sectors to MFM on the fly using ArduinoFDC library.

fddEMU uses raw floppy images (images prepared with dd or rawread) does not require or use a MFM file.

But it is possible to implement FM encoding.

fddEMU uses MFM encoding (used by HD and DD disks) so there is no FM encoding (used by SD disks) support as of now.

fddEMU is not an cycle exact floppy emulator, it is more of a hack (it's a bit slower than actual fdd) but it works because floppy controllers have sensible timeouts and we take advantage of that.

Breadboard or perfboard (for placing pullups and ADC buttons)Īrduino bootloader could be used for uploading (see command below), simply replace /dev/ttyUSB0 with your usb portĪvrdude -B 10 -p m328p -c arduino -P /dev/ttyUSB0 -U flash:w:fddEMU.hex.

Female to female jumper wires (for connecting SD adapter to arduino nano).

5 volts power supply (Computer PSU 5v pins or an external PSU can be used).

4 or 5 push buttons (required for ADC input obviously).1 100kOhm resistor (ADC7 has no pullup, so an external pullup required).4 or 5 1kOhm resistors (for making ADC buttons).Male to male jumper wires (for pullup on step and readdata pins).Male to female jumper wires (for connecting arduino nano pins to FDC ribbon cable).Two 1kOhm resistors (for step and readdata pins - atmega's internal pullups are not sufficicient for parasitic capacitance of long floppy drive cable).A micro SD card (formatted FAT16/32, floppy images in root directory).Micro SD card adapter (converts 5 volts arduino power supply and signals to 3.3 volts).

#SD FLOPPY DISK EMULATOR INDUSTRIAL SERIAL#

Arduino nano (UNO will do but button inputs require ADC7, use serial commands instead).

Standalone (using without usb serial connection) require SSD1306 i2c screen, buttons and a 5 volts power supply. You can immediately begin testing fddEMU on serial terminal with an arduino nano, an SD adapter that converts 5 volts arduino power supply and signals to 3.3 volts suitable for SD card, an SD card, and some jumper cables. An AVR (atmega328p) based floppy drive emulator for PCįddEMU is a DIY floppy drive emulator.