SDBox in a standard DB25 plastic shell
Rev. 2B
Video:
https://drive.google.com/file/d/1fLwmIyUeHZX4sln5bpJfz5QkDGD-QTOf/view?usp=sharing
+5V taken from floppy port with this USB-C dongle
https://github.com/jbilander/Amiga_DB23_to_USB_C_power_only_adapter
Rev. 2A
This hardware uses the firmware written by Niklas Ekström, available here...
https://github.com/niklasekstrom/amiga-par-to-spi-adapter
...or use my fork if you also want the Activity LED to blink (it also includes a batch-script flashSDBoxMini.bat for flashing the Mini)
https://github.com/jbilander/amiga-par-to-spi-adapter
Connecting the Arduino to program the SDBox Mini
(Programmer)
Arduino as ISP - SDBox Mini
------------------------------------
D13 (SPI) SCK - Pin 3 (ICSP) SCK
D12 (SPI) MISO - Pin 1 (ICSP) MISO
D11 (SPI) MOSI - Pin 4 (ICSP) MOSI
D10 (SPI) SS - Pin 5 (ICSP) /RESET
5V - Pin 2 VCC
GND - Pin 6 GND
On the Nano V3 the pins on the ICSP-header can be utilized connected like below. There is no need to solder an ICSP-header on the mini, you can just hold the connector against the footprint while programming.
To use the Arduino Nano as ISP it first has to be flashed with the ArduinoISP-sketch which is available under File->Examples in the Arduino IDE, or you can use the attached batch-script flash_Arduino_as_ISP.bat and binary hex ArduinoISP.ino.arduino_standard.hex I have put them in a zip-file under Releases ArduinoISP.zip. Alter the com port in the script file to suit your machine and execute it from a command-prompt. Now you are ready to flash the SDBox-Mini via the Arduino.
This requires that you already have built the main.hex file in the avr-folder, then execute flashSDBoxMini.bat from a command prompt:
C:\Users\Jorgen\Projects\amiga-par-to-spi-adapter\avr>flashSDBoxMini.bat
C:\Users\Jorgen\Projects\amiga-par-to-spi-adapter\avr>flashSDBoxMini.bat
C:\Users\Jorgen\Projects\amiga-par-to-spi-adapter\avr>"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude" -C "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf" -v -pm328p -cstk500v1 -PCOM4 -b19200 -Uflash:w:main.hex:i -Ulfuse:w:0xe6:m -Uhfuse:w:0xdf:m -Uefuse:w:0xfc:m
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"
Using Port : COM4
Using Programmer : stk500v1
Overriding Baud Rate : 19200
AVR Part : ATmega328P
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PC2
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff
flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
Programmer Type : STK500
Description : Atmel STK500 Version 1.x firmware
Hardware Version: 2
Firmware Version: 1.18
Topcard : Unknown
Vtarget : 0.0 V
Varef : 0.0 V
Oscillator : Off
SCK period : 0.1 us
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.07s
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: safemode: lfuse reads as E6
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FC
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "main.hex"
avrdude: writing flash (496 bytes):
Writing | ################################################## | 100% 0.68s
avrdude: 496 bytes of flash written
avrdude: verifying flash memory against main.hex:
avrdude: load data flash data from input file main.hex:
avrdude: input file main.hex contains 496 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 0.44s
avrdude: verifying ...
avrdude: 496 bytes of flash verified
avrdude: reading input file "0xe6"
avrdude: writing lfuse (1 bytes):
Writing | ################################################## | 100% 0.03s
avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xe6:
avrdude: load data lfuse data from input file 0xe6:
avrdude: input file 0xe6 contains 1 bytes
avrdude: reading on-chip lfuse data:
Reading | ################################################## | 100% 0.02s
avrdude: verifying ...
avrdude: 1 bytes of lfuse verified
avrdude: reading input file "0xdf"
avrdude: writing hfuse (1 bytes):
Writing | ################################################## | 100% 0.02s
avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xdf:
avrdude: load data hfuse data from input file 0xdf:
avrdude: input file 0xdf contains 1 bytes
avrdude: reading on-chip hfuse data:
Reading | ################################################## | 100% 0.02s
avrdude: verifying ...
avrdude: 1 bytes of hfuse verified
avrdude: reading input file "0xfc"
avrdude: writing efuse (1 bytes):
Writing | ################################################## | 100% 0.03s
avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0xfc:
avrdude: load data efuse data from input file 0xfc:
avrdude: input file 0xfc contains 1 bytes
avrdude: reading on-chip efuse data:
Reading | ################################################## | 100% 0.02s
avrdude: verifying ...
avrdude: 1 bytes of efuse verified
avrdude: safemode: lfuse reads as E6
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FC
avrdude: safemode: Fuses OK (E:FC, H:DF, L:E6)
avrdude done. Thank you.
C:\Users\Jorgen\Projects\amiga-par-to-spi-adapter\avr>
Warning!
Connection of a GPIO to a voltage higher than 3.3V will likely destroy the GPIO block within the SoC.
I used my Logic level converter board in between the devices and powered from the RPi's +5V
First install avrdude:
sudo apt install avrdude
Now copy the default config file to a new file under /home/pi
cp /etc/avrdude.conf ~/avrdude_gpio.conf
Add this entry last in the file using your editor (vim or nano) and save the file:
#------------------------------------------------------------
# Linux GPIO configuration for avrdude
# Change the lines below to the GPIO pins connected to the AVR
#------------------------------------------------------------
programmer
id = "pi_1";
desc = "Use the Linux sysfs interface to bitbang GPIO lines";
type = "linuxgpio";
reset = 12;
sck = 24;
mosi = 23;
miso = 18;
;
Now cd into /home/pi and make the script-file executable:
chmod 755 ./flashSDBoxMini.sh
With all jumper-wires connected and main.hex built, run the script flashSDBoxMini.sh (OR type the line below and hit enter)
sudo avrdude -C ~/avrdude_gpio.conf -c pi_1 -v -p m328p -Uflash:w:main.hex:i -Ulfuse:w:0xe6:m -Uhfuse:w:0xdf:m -Uefuse:w:0xfc:m
pi@raspberrypi:~ $ ./flashSDBoxMini.sh
pi@raspberrypi:~ $ ./flashSDBoxMini.sh
avrdude: Version 6.3-20171130
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "/home/pi/avrdude_gpio.conf"
User configuration file is "/root/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : unknown
Using Programmer : pi_1
AVR Part : ATmega328P
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PC2
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff
flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
Programmer Type : linuxgpio
Description : Use the Linux sysfs interface to bitbang GPIO lines
Pin assignment : /sys/class/gpio/gpio{n}
RESET = 12
SCK = 24
MOSI = 23
MISO = 18
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: safemode: lfuse reads as E6
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FC
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "main.hex"
avrdude: writing flash (496 bytes):
Writing | ################################################## | 100% 0.11s
avrdude: 496 bytes of flash written
avrdude: verifying flash memory against main.hex:
avrdude: load data flash data from input file main.hex:
avrdude: input file main.hex contains 496 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 0.10s
avrdude: verifying ...
avrdude: 496 bytes of flash verified
avrdude: reading input file "0xe6"
avrdude: writing lfuse (1 bytes):
Writing | ################################################## | 100% 0.00s
avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xe6:
avrdude: load data lfuse data from input file 0xe6:
avrdude: input file 0xe6 contains 1 bytes
avrdude: reading on-chip lfuse data:
Reading | ################################################## | 100% 0.00s
avrdude: verifying ...
avrdude: 1 bytes of lfuse verified
avrdude: reading input file "0xdf"
avrdude: writing hfuse (1 bytes):
Writing | ################################################## | 100% 0.00s
avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xdf:
avrdude: load data hfuse data from input file 0xdf:
avrdude: input file 0xdf contains 1 bytes
avrdude: reading on-chip hfuse data:
Reading | ################################################## | 100% 0.00s
avrdude: verifying ...
avrdude: 1 bytes of hfuse verified
avrdude: reading input file "0xfc"
avrdude: writing efuse (1 bytes):
Writing | ################################################## | 100% 0.00s
avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0xfc:
avrdude: load data efuse data from input file 0xfc:
avrdude: input file 0xfc contains 1 bytes
avrdude: reading on-chip efuse data:
Reading | ################################################## | 100% 0.00s
avrdude: verifying ...
avrdude: 1 bytes of efuse verified
avrdude: safemode: lfuse reads as E6
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FC
avrdude: safemode: Fuses OK (E:FC, H:DF, L:E6)
avrdude done. Thank you.
pi@raspberrypi:~ $
One caveat to keep in mind when building and programming Rev.2A (the first revision of the Mini) is the flashing of the fw can't be done with U4 chip in place as it drives/conflicts with MISO on ICSP (In-Circuit Serial Programming). For Rev. 2B PCB use 74AHCT1G126 instead of 74LVC1G17, same package/footprint. This solves the flashing conflict problem. You put a Jumper-shunt on JP1 (on Rev 2B PCB) while flashing and remove it afterwards.
Start with the 16 MHz Crystal, C8, C9 and the ATMega328P.
At this point you should be able to flash the Firmware to the ATMega using either an Arduino as ISP or a Raspberry Pi.
Continue with the rest of the components on the front side, and then the back side. I usually pre-tin the C1 pads and use hot air to put the C1-Capacitor in place.
Verify the Micro USB-jack and the voltage levels...
Now it's time to drill the holes for the LEDs, begin with a 1 mm drill and then step up to 2 mm and finally 3 mm. Be very careful when drilling to get a nice clean 3mm hole, it's very easy to slip and the hole gets oval or offset.
Short video showing copying a 8 MB file from the HD to the SD-card on my A1200. +5V to power the SDBox I nicked from the floppy port DB23->microUSB (Howto make such a cable here ).
Video:
https://i.imgur.com/mF9Bp4C.mp4
Download Amiga.zip from Releases.
- Put latest
fat95intoL:(download from Aminet) - Put
SD0andSD0.infointoDevs:(fromAmiga.zip) - Put
spisd.deviceintoDevs:(fromAmiga.zip) - Put
Mount_SDCARDandMount_SDCARD.infoanywhere on your HD or floppy disk. - Put a FAT/FAT32 formatted MicroSD-card in the card reader (Max 4 GB partitioned).
- Double-click the
Mount_SDCARDicon.
Disk icon should now appear on the Workbench screen.
Happy Hackin´
| Position | Name/Value | Package | Notes |
|---|---|---|---|
| U4 | 74AHCT1G126 | 5-TSSOP, SC-70-5, SOT-353 (2.0 mm × 1.25mm) | Single non-inverting buffer 74AHCT1G126 (instead of 74LVC1G17) https://www.mouser.com/ProductDetail/Nexperia/74AHCT1G126GW125?qs=P62ublwmbi%252BsCpFPoi5fgw%3D%3D |
| JP1 | 2.0mm two-pin header + jumper-shunt | ||
| R6 | 10k Ohm Resistor | 0603 SMD | Pull-up resistor for OE pin 1 of 74AHCT1G126 |
| Position | Name/Value | Package | Notes |
|---|---|---|---|
| U1 | LM1117-3.3 | SOT-223 | Low-Dropout Linear Regulator 3.3 Volt |
| U2 | ATMega328P-AU | TQFP-32_7x7mm_P0.8mm | 8-bit AVR Microcontroller with 32K Bytes In-System Programmable Flash |
| U3 | 74LVC3G17 | TSSOP-8_3x3mm_P0.65mm | Triple non-inverting Schmitt trigger with 5V tolerant input https://www.digikey.se/product-detail/en/nexperia-usa-inc/74LVC3G17DP-125/1727-5998-1-ND/2753830 |
| U4 | 74LVC1G17 | 5-TSSOP, SC-70-5, SOT-353 (2.0 mm × 1.25mm) | Single non-inverting Schmitt trigger https://www.digikey.se/product-detail/en/nexperia-usa-inc/74LVC1G17GW-125/1727-4117-1-ND/1965408 For Rev. 2B PCB use 74AHCT1G126 instead of 74LVC1G17, same package/footprint: https://www.mouser.com/ProductDetail/Nexperia/74AHCT1G126GW125?qs=P62ublwmbi%252BsCpFPoi5fgw%3D%3D |
| J1 | D-Sub DB25 | DB25 Male connector with solder lugs | DB25 for Amiga parallel port |
| J2 | ICSP | PinHeader_2x03_P2.54mm_Vertical | Pin header (MISO,VCC,SCK,MOSI,/RESET,GND) for flashing AVR via In-Circuit Serial Programming |
| J3 | Micro SD Card Holder | 9-pin Micro SD card slot connector | https://www.aliexpress.com/item/32802051702.html |
| J4 | Micro USB connector | USB Micro B SMT | For +5V Power only https://www.aliexpress.com/item/32991869539.html |
| Y1 | Ceramic SMD quartz 16.0 MHz, LC 12 pF | 3 x 5 x 1 mm | For use with XTAL1, XTAL2 on AVR, e.g. https://www.reichelt.com/se/en/ceramic-smd-quartz-3-x-5-x-1-mm-16-0-mhz-16-000000-mj-p85005.html or https://www.mouser.se/ProductDetail/520-160-12-30B-AGMT |
| D1 (Optional) | LED 3mm | PinHeader_1x02_P2.54mm_Vertical, pin pitch 2.54 mm | SD Activity LED indicator, Diffused Orange / Amber, 1.8V-2.3V, 20-30 mA, 605-610nm |
| D2 (Optional) | LED 3mm | PinHeader_1x02_P2.54mm_Vertical, pin pitch 2.54 mm | Power LED indicator, Green Diffused T-1, 25 mcd, 565 nm, 2.2 V, 25 mA |
| R1 (Optional) | 150 Ohm Resistor | 0603 SMD, 200 mW | (Mandatory if D1 populated) Series resistor for D1 LED, adjust R-value to your type of LED and preferred brightness |
| R2 (Optional) | 150 Ohm Resistor | 0603 SMD, 200 mW | (Mandatory if D2 populated) Series resistor for D2 LED, adjust R-value to your type of LED and preferred brightness |
| R3 | 10k Ohm Resistor | 0603 SMD | Pull-up (to VCC) resistor for /SS |
| R4 (Optional) | 10k Ohm Resistor | 0603 SMD | Pull-up (to VCC) resistor for MOSI |
| R5 (Optional) | 10k Ohm Resistor | 0603 SMD | Pull-up (to VCC) resistor for /RESET |
| RN1 | CAY16-103J4LF RES ARRAY 4 Resistors 10k | 1206 SMD | https://www.digikey.se/product-detail/sv/bourns-inc/CAY16-103J4LF/CAY16-103J4LFCT-ND/ |
| RN1 | Pull-up (to 3V3) for MISO_3V3 | ||
| RN1 | Pull-up (to 3V3) for DAT1 pin 8 on MicroSD-holder | ||
| RN1 | Pull-up (to 3V3) for DAT2 pin 1 on MicroSD-holder | ||
| C1 | 220uF Capacitor | SMD-Tantalum, 4.3 x 7.3 x 2.8 mm | Capacitor for VIN +5V Power via USB https://www.reichelt.com/se/en/smd-tantalum-220-f-10v-125-c-t491d-220u-10-p206492.html |
| C2 | 10uF Capacitor | 1206 SMD | Capacitor (VCC) for Voltage regulator U1 |
| C3 | 10uF Capacitor | 1206 SMD | Capacitor (3V3) for Voltage regulator U1 |
| C4 | 0.1uF = 100nF Capacitor | 0603 SMD | Capacitor (3V3) for Voltage regulator U1 |
| C5 | 0.1uF = 100nF Capacitor | 0603 SMD | Decoupling capacitor for U2 |
| C6 | 0.1uF = 100nF Capacitor | 0603 SMD | Decoupling capacitor for U3 |
| C7 | 0.1uF = 100nF Capacitor | 0603 SMD | Decoupling capacitor for U4 |
| C8 | 16pF Capacitor | 0603 SMD | Capacitor for XTAL1 (Y1) |
| C9 | 16pF Capacitor | 0603 SMD | Capacitor for XTAL2 (Y1) |
| X | D-Sub DB25 | Two DB25 plastic shells with screws and nuts | Plastic hood cover x 2 |