Difference between revisions of "Front Panel For 8 Bit Computers"

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<video type="youtube">WupSfpHNN78</video>
 
<video type="youtube">WupSfpHNN78</video>
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<video type="youtube">nmlrxyyVe7Q</video>
  
 
== Front Panel for 8-Bit Microprocessors ==
 
== Front Panel for 8-Bit Microprocessors ==
 +
 +
* See [[Front_Panel_for_8_Bit_Computers_V2|here for V2 (through-hole) version]]
  
 
[[File:EightBitFrontPanel720px.JPG]]
 
[[File:EightBitFrontPanel720px.JPG]]
 +
 +
=== Top row controls ===
 +
 +
Typical controls.
 +
 +
[[File:FrontPanel-01-Front-3D-controls.png]]
  
 
== Features ==
 
== Features ==
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It has these features. They may not fit your generic design. Especially since this card has to have an I2C interface.
 
It has these features. They may not fit your generic design. Especially since this card has to have an I2C interface.
  
 +
* 32 Pushbutton Switches
 +
* 32 LEDs
 
* I2C interface (Two Wire interface - plus power and ground)
 
* I2C interface (Two Wire interface - plus power and ground)
−
* Occupy I2C addresses either 0x20-0x23 or 0x24-0x27
+
** Jumper selectable base address
−
* Jumper selectable base address
+
** Occupies I2C addresses either 0x20-0x23 or 0x24-0x27
−
* Jumper Selectable I2C terminators
+
** Jumper Selectable I2C terminators
 
* I2C daisy-chain connector
 
* I2C daisy-chain connector
−
* Interrupt line
+
** Interrupt line
−
** Can be configured to interrupt on button presses
+
*** Can be configured to interrupt on button presses
−
** MCP23017 need to be set to Open-Drain output - card has pull-up to Vcc
+
*** MCP23017 need to be set to Open-Drain output - card has pull-up to Vcc
 
* 4 MCP23017 16-bit I2C Port Expanders
 
* 4 MCP23017 16-bit I2C Port Expanders
−
* These are fine pitch surface mount parts
+
** These are fine pitch surface mount parts
−
* 32 Pushbutton Switches
+
** [https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MCP23017-Data-Sheet-DS20001952.pdf MCP23017 Datasheet] - Rev D
−
* 32 LEDs
+
** [https://hackaday.com/2023/02/03/mcp23017-went-through-shortage-hell-lost-two-inputs/?fbclid=IwAR1ktG1CsU7ns5fmTYXdlpBLdqaJmBioXrVrG1_Lgqe8MTQr1AY4rp6IETU MCP23017... LOST TWO INPUTS]
 +
*** MCP23017 now a 14/16-bit expander, with two of the pins (GPA7 and GPB7) losing their input capabilities
 +
*** The chips look the same, are called the same, and act mostly the same — if you don’t download the latest version of the datasheet (Revision D), you’d never know that there’s been a change
 
* 3.3V or 5V operation
 
* 3.3V or 5V operation
 +
* Compatible form factor with [[RETRO-EP4CE15]] and other cards
 +
** 95x95mm
 +
** 6-32 mounting holes
 +
 +
== Connector ==
 +
 +
=== J2 - I2C Connector ===
 +
 +
* Two row header on bottom of card
 +
* 5 pin in
 +
* 4 pin out (daisy-chain)
 +
 +
# GND
 +
# VCC
 +
# SDA
 +
# SCL
 +
# INT*
 +
 +
And
 +
 +
# GND
 +
# VCC
 +
# SDA
 +
# SCL
  
 
== Schematic ==
 
== Schematic ==
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== Drivers ==
 
== Drivers ==
 +
 +
=== VHDL Driver ===
 +
 +
* [https://github.com/douggilliland/Design_A_CPU/tree/main/Peripherals/FrontPanel01 VHDL code to control Front Panel autonomously]
 +
** Great for FPGA Retro-computers
 +
** Converts pushbuttons into raw, debounced, and toggled outputs
 +
** Uses [https://github.com/douggilliland/Design_A_CPU/wiki IOP16 small CPU core]
 +
** Example: [https://github.com/douggilliland/MultiComp/tree/master/MultiComp_On_RETRO-EP4CE15/M6800_MIKBUG_FrontPanel01 6800 running MIKBUG using the Front Panel] - Run/Halt the CPU, Read SRAM, ROM, etc, Write to SRAM
 +
 +
==== VHDL Entity ====
 +
 +
<pre>
 +
-- -------------------------------------------------------------------------------------------------------
 +
-- Front Panel starts here
 +
 +
fp01 : work.FrontPanel01
 +
  port map
 +
  (
 +
    -- Clock and reset
 +
    i_CLOCK_50 => i_CLOCK_50, -- Clock (50 MHz)
 +
    i_n_reset => w_resetClean_n, -- Reset
 +
    -- 32 outs, 32 ins
 +
    i_FPLEDs => w_LEDsOut, -- Out to LEDs (32)
 +
    o_PBRaw => w_PBsRaw, -- Raw version of the Pushbuttons (32)
 +
    o_PBLatched => w_PBLatched, -- Latched version of the Pushbuttons (32)
 +
    o_PBToggled => w_PBsToggled, -- Toggle version of the Pushbuttons (32)
 +
    -- I2C interface
 +
    io_I2C_SCL => io_I2C_SCL, -- I2C clock to Front Panel card
 +
    io_I2C_SDA => io_I2C_SDA, -- I2C data to/from Front Panel card
 +
    i_I2C_INTn => i_I2C_INTn -- Interrupt input - active low
 +
  );
 +
 +
-- Front Panel ends here
 +
-- -------------------------------------------------------------------------------------------------------
 +
 +
</pre>
 +
 +
=== Arduino Driver ===
  
 
* I2C parts are standard MCP23017 drivers which are supported in Arduino and most microprocessors
 
* I2C parts are standard MCP23017 drivers which are supported in Arduino and most microprocessors
 +
** [https://github.com/land-boards/lb-Arduino-Code/tree/master/libraries/LandBoards_MCP23017 LandBoards_MCP23017 library]
 +
** [https://www.arduino.cc/en/Guide/Libraries?setlang=en#importing-a-zip-library Importing an Arduino ZIP library]
 +
 +
=== Micro-Python ===
 +
 +
* [https://github.com/land-boards/lb-Python-Code/blob/master/MicroPython/PyBoard%20Clone/libraries/mcp23017/mcp23017.py Micro-Python driver for MCP23017]
 +
 +
=== C Code ===
 +
 
* [https://github.com/douggilliland/Retro-Computers/tree/master/Z80/PSOC/PSOC_Design_Files/Z80-PSoC-3-Chips_002/Z80_3Chip.cydsn PSoC driver GitHub Repo]
 
* [https://github.com/douggilliland/Retro-Computers/tree/master/Z80/PSOC/PSOC_Design_Files/Z80-PSoC-3-Chips_002/Z80_3Chip.cydsn PSoC driver GitHub Repo]
 +
** [https://github.com/douggilliland/Retro-Computers/blob/master/Z80/PSOC/PSOC_Design_Files/Z80-PSoC-3-Chips_002/Z80_3Chip.cydsn/FrontPanel.c FrontPanel.c]
 +
** [https://github.com/douggilliland/Retro-Computers/blob/master/Z80/PSOC/PSOC_Design_Files/Z80-PSoC-3-Chips_002/Z80_3Chip.cydsn/FrontPanel.h FrontPanel.h]
 +
** [https://github.com/douggilliland/Retro-Computers/blob/master/Z80/PSOC/PSOC_Design_Files/Z80-PSoC-3-Chips_002/Z80_3Chip.cydsn/MCP23017.c MCP23017.c]
 +
** [https://github.com/douggilliland/Retro-Computers/blob/master/Z80/PSOC/PSOC_Design_Files/Z80-PSoC-3-Chips_002/Z80_3Chip.cydsn/MCP23017.h MCP23017.h]
 +
 +
== Assembly Sheet ==
 +
 +
[[Front Panel Assembly Sheet Rev 1]]

Latest revision as of 14:47, 4 February 2023

Tindie-mediums.png

Front Panel for 8-Bit Microprocessors

EightBitFrontPanel720px.JPG

Top row controls

Typical controls.

FrontPanel-01-Front-3D-controls.png

Features

It has these features. They may not fit your generic design. Especially since this card has to have an I2C interface.

  • 32 Pushbutton Switches
  • 32 LEDs
  • I2C interface (Two Wire interface - plus power and ground)
    • Jumper selectable base address
    • Occupies I2C addresses either 0x20-0x23 or 0x24-0x27
    • Jumper Selectable I2C terminators
  • I2C daisy-chain connector
    • Interrupt line
      • Can be configured to interrupt on button presses
      • MCP23017 need to be set to Open-Drain output - card has pull-up to Vcc
  • 4 MCP23017 16-bit I2C Port Expanders
    • These are fine pitch surface mount parts
    • MCP23017 Datasheet - Rev D
    • MCP23017... LOST TWO INPUTS
      • MCP23017 now a 14/16-bit expander, with two of the pins (GPA7 and GPB7) losing their input capabilities
      • The chips look the same, are called the same, and act mostly the same — if you don’t download the latest version of the datasheet (Revision D), you’d never know that there’s been a change
  • 3.3V or 5V operation
  • Compatible form factor with RETRO-EP4CE15 and other cards
    • 95x95mm
    • 6-32 mounting holes

Connector

J2 - I2C Connector

  • Two row header on bottom of card
  • 5 pin in
  • 4 pin out (daisy-chain)
  1. GND
  2. VCC
  3. SDA
  4. SCL
  5. INT*

And

  1. GND
  2. VCC
  3. SDA
  4. SCL

Schematic

Drivers

VHDL Driver

VHDL Entity

-- -------------------------------------------------------------------------------------------------------
-- Front Panel starts here
	
fp01 : work.FrontPanel01
  port map
  (
    -- Clock and reset
    i_CLOCK_50		=> i_CLOCK_50,		-- Clock (50 MHz)
    i_n_reset		=> w_resetClean_n,	-- Reset
    -- 32 outs, 32 ins
    i_FPLEDs		=> w_LEDsOut,		-- Out to LEDs (32)
    o_PBRaw		=> w_PBsRaw,		-- Raw version of the Pushbuttons (32)
    o_PBLatched		=> w_PBLatched,		-- Latched version of the Pushbuttons (32)
    o_PBToggled		=> w_PBsToggled,	-- Toggle version of the Pushbuttons (32)
    -- I2C interface
    io_I2C_SCL		=> io_I2C_SCL,		-- I2C clock to Front Panel card
    io_I2C_SDA		=> io_I2C_SDA,		-- I2C data to/from Front Panel card
    i_I2C_INTn		=> i_I2C_INTn		-- Interrupt input - active low
  );

-- Front Panel ends here
-- -------------------------------------------------------------------------------------------------------

Arduino Driver

Micro-Python

C Code

Assembly Sheet

Front Panel Assembly Sheet Rev 1

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