Difference between revisions of "TinyPS2"
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− | [[File: | + | See [[TinyPS2 Revs 1-3]] for ATTiny85 based build |
+ | |||
+ | [[File:TinyPS2_Front_Rev4_3D.png]] | ||
+ | |||
+ | == Introduction == | ||
+ | |||
+ | It is getting difficult to find ASCII serial keyboards for use in Retro-Computer projects. This card fills that need. The card is a PS/2 keyboard to TTL Level Serial adapter. PS/2 keyboards are still widely available. | ||
+ | |||
+ | [[file:Keyboard_PS2_MicrosoftNatural.jpg]] | ||
== Features == | == Features == | ||
− | * | + | * [[QT_Py_(RP2040_based)|QT Py (RP2040 based)]] |
− | + | ** Run at 125 MHz | |
− | ** | + | ** 2MB of In System Programmable (ISP) flash |
− | + | ** 264KB of SRAM | |
− | ** | + | * 115,200 baud serial |
− | ** | + | ** 57,600-250,000 are build time options |
− | * | ||
* 49x49mm ODAS form factor | * 49x49mm ODAS form factor | ||
− | * 4-40 mounting holes | + | * (4) 4-40 mounting holes |
+ | * 3.3V or 5V operation | ||
* Current measurement | * Current measurement | ||
− | ** | + | ** TBD @ 5V (without keyboard) |
− | ** | + | ** TBD @ 5V (including keyboard) |
+ | ** TBD @ 3.3V (including keyboard) | ||
+ | *** Does not require a keyboard that works at 3.3V | ||
+ | === CPU Connections === | ||
− | + | [[file:TinyPS2_CPU_Rev4_Conns.PNG]] | |
− | + | <pre> | |
+ | #define DATAPIN 27 | ||
+ | #define IRQPIN 26 | ||
+ | </pre> | ||
== Connectors == | == Connectors == | ||
Line 25: | Line 39: | ||
=== J1 - TTL Serial Connector === | === J1 - TTL Serial Connector === | ||
− | [[file: | + | [[file:TinyPS2_J1_Rev4_Conns.PNG]] |
− | # | + | # VCC (pin nearest to J1 silkscreem) |
# SERTX | # SERTX | ||
# N/C | # N/C | ||
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* Standard PS/2 Mini-DIN-6 connector | * Standard PS/2 Mini-DIN-6 connector | ||
− | [[file: | + | [[file:TinyPS2_J2_Rev4_Conns.PNG]] |
− | == | + | == Firmware Build Card Rev 4 == |
− | [[file: | + | [[file:asciifull.png]] |
− | + | === Arduino === | |
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− | + | * Card rev 4 uses a QTPy or XAIO RP2040 CPU | |
− | + | * Arduino Library | |
− | + | ** [https://github.com/techpaul/PS2KeyAdvanced PS2KeyAdvanced] | |
− | + | * [https://github.com/land-boards/lb-Arduino-Code/blob/master/LBCards/TinyPS2/TinyPS2_PCB_Rev4_AdvKbd/TinyPS2_PCB_Rev4_AdvKbd.ino TinyPS2_PCB_Rev4_AdvKbd] - code | |
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− | * [https:// | ||
− | * [https://github.com/land-boards/lb-Arduino-Code/ | ||
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<pre> | <pre> | ||
− | + | #define DATAPIN 27 | |
− | + | #define IRQPIN 26 | |
</pre> | </pre> | ||
− | + | * Example code produces warning | |
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<pre> | <pre> | ||
− | + | WARNING: library PS2KeyAdvanced claims to run on avr, sam, samd1, stm32, esp32 architecture(s) and may be incompatible with your current board which runs on rp2040 architecture(s). | |
− | + | Sketch uses 82336 bytes (0%) of program storage space. Maximum is 16777216 bytes. | |
+ | Global variables use 43096 bytes (15%) of dynamic memory, leaving 227240 bytes for local variables. Maximum is 270336 bytes. | ||
+ | </pre> | ||
− | + | * Code works well! | |
− | |||
− | + | === C++ === | |
− | |||
− | // | + | * [https://github.com/tvlad1234/pico-ps2Driv pico-ps2Driv] - SDK C code |
− | |||
− | |||
− | + | === CircuitPython === | |
− | + | * CircuitPython support issues | |
− | + | ** [https://docs.circuitpython.org/en/latest/shared-bindings/ps2io/index.html PS/2 Library] - Not in Pico core modules | |
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<pre> | <pre> | ||
− | + | >>> import ps2io | |
− | + | Traceback (most recent call last): | |
+ | File "<stdin>", line 1, in <module> | ||
+ | ImportError: no module named 'ps2io' | ||
</pre> | </pre> | ||
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== Schematic == | == Schematic == | ||
Line 148: | Line 99: | ||
== Issues == | == Issues == | ||
− | * | + | * [[TinyPS2_Revs_1-3|Revs 1-3 are documented here]] |
− | ** | + | |
− | ** | + | === Rev 4 === |
− | * | + | |
− | ** | + | * Changed CPU |
+ | ** Was 8 MHz ATTiny85 | ||
+ | ** Changed to QT PY or XAIO | ||
+ | * Changed pin usage | ||
+ | * Uses Hardware Transmitter in CPU | ||
+ | * Keyboard runs at 5V | ||
+ | * CPU runs at 3.3VV | ||
+ | * 3.3V to 5V level shifter | ||
== Assembly Sheet == | == Assembly Sheet == | ||
− | * [[TinyPS2 Assembly Sheet]] | + | * [[TinyPS2 Rev 4 Assembly Sheet]] |
Latest revision as of 16:51, 15 August 2022
See TinyPS2 Revs 1-3 for ATTiny85 based build
Contents
Introduction
It is getting difficult to find ASCII serial keyboards for use in Retro-Computer projects. This card fills that need. The card is a PS/2 keyboard to TTL Level Serial adapter. PS/2 keyboards are still widely available.
Features
- QT Py (RP2040 based)
- Run at 125 MHz
- 2MB of In System Programmable (ISP) flash
- 264KB of SRAM
- 115,200 baud serial
- 57,600-250,000 are build time options
- 49x49mm ODAS form factor
- (4) 4-40 mounting holes
- 3.3V or 5V operation
- Current measurement
- TBD @ 5V (without keyboard)
- TBD @ 5V (including keyboard)
- TBD @ 3.3V (including keyboard)
- Does not require a keyboard that works at 3.3V
CPU Connections
#define DATAPIN 27 #define IRQPIN 26
Connectors
J1 - TTL Serial Connector
- VCC (pin nearest to J1 silkscreem)
- SERTX
- N/C
- GND
J2 - PS/2
- Standard PS/2 Mini-DIN-6 connector
Firmware Build Card Rev 4
Arduino
- Card rev 4 uses a QTPy or XAIO RP2040 CPU
- Arduino Library
- TinyPS2_PCB_Rev4_AdvKbd - code
#define DATAPIN 27 #define IRQPIN 26
- Example code produces warning
WARNING: library PS2KeyAdvanced claims to run on avr, sam, samd1, stm32, esp32 architecture(s) and may be incompatible with your current board which runs on rp2040 architecture(s). Sketch uses 82336 bytes (0%) of program storage space. Maximum is 16777216 bytes. Global variables use 43096 bytes (15%) of dynamic memory, leaving 227240 bytes for local variables. Maximum is 270336 bytes.
- Code works well!
C++
- pico-ps2Driv - SDK C code
CircuitPython
- CircuitPython support issues
- PS/2 Library - Not in Pico core modules
>>> import ps2io Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: no module named 'ps2io'
Schematic
Issues
Rev 4
- Changed CPU
- Was 8 MHz ATTiny85
- Changed to QT PY or XAIO
- Changed pin usage
- Uses Hardware Transmitter in CPU
- Keyboard runs at 5V
- CPU runs at 3.3VV
- 3.3V to 5V level shifter