Front Panel for 8 Bit Computers V2

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Tindie-mediums.png

FrontPanel02 P527-cropped-720px.jpg

Front Panel for 8-Bit Microprocessors v2

See here for Ver 1 - SMT version

Features

This is a through-hole version of Front Panel for 8_Bit Computers.

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 of MCP23017 16-bit I2C Port Expanders
    • These are fine pitch surface mount parts
  • 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

Legends

FrontPanel-01-Front-3D-800px.png

  • D0-D7 - Data bus
  • A0-A15 - Address bus
  • Controls

Top row controls

Board has typical control silkscreen markings. It is all through hole so that it is much easier to assemble.

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

  • RUN - Run/Halt pushbutton, RUN LED on for CPU running
  • RESET - Reset the CPU
  • STEP - Single Step the CPU
  • Undefined
  • CLEAR - Clear address bus (if SETADR is ON) or data bus lines (if SETDAT is ON)
  • INCADR - Increment the address
    • If SETDAT is on write data
  • SETDAT - Set the data value
  • SETADR - Set the address

Drivers

VHDL Driver

VHDL Entities

  • Panel Entity
-- -------------------------------------------------------------------------------------------------------
-- Front Panel starts here
-- Pass IOP16 code size and stack size down to the Front Panel
fp01 : work.FrontPanel01
	generic	map ( 
		INST_ROM_SIZE_IN	=> 512,			-- 512W code size
		STACK_DEPTH_IN		=> 4			-- 16 deep stack size
	)
	port map
	(
		-- Clock and reset
		i_CLOCK_50		=> i_CLOCK_50,		-- Clock (50 MHz)
		i_n_reset		=> i_n_reset,		-- Reset (from FGPGA KEY)
		-- 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
-- -------------------------------------------------------------------------------------------------------
  • Higher level entity
    • 6800 with front Panel application
-- Front Panel
MIKBUG_FRPNL : entity work.MIKBUG_FRPNL
	port map
	(
	-- Clock and reset
	i_CLOCK_50	=> i_CLOCK_50,
	i_cpuClock	=> w_cpuClock,
	i_n_reset	=> w_resetLow,
	o_FPReset	=> w_FPReset,
	-- CPU intercepts
	-- Front Panel loops back signals when in Front Panel switch is in Run Mode
	i_CPUAddress	=> w_cpuAddressB,
	o_CPUAddress	=> w_cpuAddress,
	i_cpuData	=> w_cpuDataOutB,
	o_cpuData	=> w_cpuDataOut,
	i_CPURdData	=> w_cpuDataIn,
	io_run0Halt1	=> w_run0Halt1,
	o_wrRamStr	=> w_wrRamStr,
	i_R1W0		=> w_R1W0B,
	o_R1W0		=> w_R1W0,
	-- External I2C connections
	io_I2C_SCL	=> io_I2C_SCL,
	io_I2C_SDA	=> io_I2C_SDA,
	i_I2C_INTn	=> i_I2C_INTn
);

6800 with Front Panel Operation

  • Memory map for this configuration is
0x0000-0x7FFF - INTERNAL SRAM
0x8018-0x8019 - VDU (serSelect J3 JUMPER REMOCED)
0x8028-0x8019 - ACIA
0x8030-0x803F - Front Panel
0xC000-0xFFFF - MIKBUG ROM - Copied 4X

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

Halt CPU
  • Card comes up running SMITHBUG at 0xC000
  • RUN LED comes up on
  • A0-A15 LEDs light "dimly" once CPU is running
  • Other control LEDs off
  • Press RUN SW32 to halt CPU, LED will go off
  • A0-A31, D0-D7 LEDs may be off if run first time
    • May come up at address 0x0000 and show value in SRAM at that address (0x00 at power on)
Read from Program ROM
  • Enter address set mode by pressing SW24 SETADR pushbutton, LED will illuminate
  • Set address to 0xC000 by pressing A31, A30, LEDs will light
  • Press SETADR pushbutton again to exit set address mode, LED will go off
  • For MIKBUG, data will be 0x8E
  • Press INCADR SW26
  • Address will increment to 0xC001
  • Data will show 0x7F
  • Next INCADR values are as follows
   c000                 START EQU *
   c000   8e 7f 44      	LDS #STACK
   c003   bf 7f 0a      	STS SP
   c006   7f 7f 0d      	CLR ECHO
   c009   ce c1 25      	LDX #SFE
   c00c   ff 7f 17      	STX SWIPTR
   c00f   ff 7f 08      	STX NIO
Access SRAM
  • Enter address set mode by pressing SW24 SETADR pushbutton, LED will illuminate
  • Set address to 0x0000
  • Press SETADR pushbutton again to exit set address mode, LED will go off
  • Press INCADR pushbutton to read data
  • Press SETDAT pushbutton to enter write data mode
  • Set the data value to write to SRAM on pushbuttons
  • Press INCADR to do the write and advance the address
  • Press SETDAT pushbutton again to exit write data mode
  • Verify data as above

Arduino Driver

Micro-Python

PSoC Control

  • Z80 example

C Code

Assembly Sheet

Front Panel V2 Assembly Sheet Rev 1

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