Difference between revisions of "Front Panel for 8 Bit Computers V2"

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*** [https://github.com/douggilliland/Design_A_CPU/tree/main/CPU_Code/Application_Code/FP01_LOOP4 IOP Code] - Controls the Front Panel
 
*** [https://github.com/douggilliland/Design_A_CPU/tree/main/CPU_Code/Application_Code/FP01_LOOP4 IOP Code] - Controls the Front Panel
  
==== VHDL Entity ====
+
==== VHDL Entities ====
 +
 
 +
* Panel Entity
  
 
<pre>
 
<pre>
Line 121: Line 123:
 
-- Front Panel ends here
 
-- Front Panel ends here
 
-- -------------------------------------------------------------------------------------------------------
 
-- -------------------------------------------------------------------------------------------------------
 +
</pre>
 +
 +
* Higher level entity
 +
** 6800 with front Panel application
  
 +
<pre>
 +
-- 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
 +
);
 
</pre>
 
</pre>
  
 
==== 6800 with Front Panel Operation ====
 
==== 6800 with Front Panel Operation ====
 +
 +
* Memory map for this configuration is
 +
 +
<pre>
 +
0x0000-0x7FFF - 32KB INTERNAL SRAM
 +
0XEC00-0xEFFF - 1KB INTERNAL SRAM (SCRATCHPAD SRAM USED BY MIKBUG)
 +
0xFC18-0xFC19 - VDU (serSelect J3 JUMPER REMOVED)
 +
0xFC28-0xFC19 - ACIA
 +
0xFC30-0xFC3F - Front Panel
 +
0xF000-0xFFFF - MIKBUG ROM - Copied 4X
 +
</pre>
  
 
[[File:FrontPanel-01-Front-3D-controls.png]]
 
[[File:FrontPanel-01-Front-3D-controls.png]]
  
* Card comes up running [https://github.com/douggilliland/Retro-Computers/blob/master/6800/A68%206800%20Assembler_SMITHBUG_AT__F000/V2_DIS_corrected.LST SMITHBUG at 0xF000]
+
===== Halt CPU =====
* RUN LED On
+
 
 +
* Card comes up running [https://github.com/douggilliland/MultiComp/blob/master/MultiComp%20(VHDL%20Template)/Components/ROMs/MIKBUG_6800/DGG_MIKBUG_60KB.LST SMITHBUG at 0xF000]
 +
* RUN LED comes up on
 
* A0-A15 LEDs light "dimly" once CPU is running
 
* A0-A15 LEDs light "dimly" once CPU is running
 
* Other control LEDs off
 
* Other control LEDs off
* Press PB31 to halt CPU
+
* Press RUN SW32 to halt CPU, LED will go off
 
* A0-A31, D0-D7 LEDs may be off if run first time
 
* A0-A31, D0-D7 LEDs may be off if run first time
* Read from ROM
+
** May come up at address 0x0000 and show value in SRAM at that address (0x00 at power on)
** Press SETADR pushbutton, LED will illuminate
+
 
** Press A31,A30, LEDs will light
+
===== Read from Program ROM =====
** Press SETADR pushbutton, LED will go off
+
 
** For MIKBUG, data will be 0x8E
+
* Enter address set mode by pressing SW24 SETADR pushbutton, LED will illuminate
** Press INCADR
+
* Set address to 0xF000 by pressing A31, A30, A29, A28 LEDs will light
** Address will increment to 0xC001
+
* Press SETADR pushbutton again to exit set address mode, LED will go off
** Data will show 0x7E
+
* For MIKBUG, data will be 0x8E
** Next INCADR values are 0x44,
+
* Press INCADR SW26
 +
* Address will increment to 0F001
 +
* Data will show 0x7F
 +
* Next INCADR values are as follows
 
<pre>
 
<pre>
   f000  8e ef 44     LDS #STACK
+
   f000  8e ef 44     LDS #STACK
   f003  bf ef 0a     STS SP
+
   f003  bf ef 0a     STS SP
   f006  7f ef 0d     CLR ECHO ; DGG - default to serial port echo on
+
   f006  7f ef 0d     CLR ECHO ; DGG - default to serial port echo on
   f009  ce f1 25     LDX #SFE ; DGG - VECTORED SWI ROUTINE
+
   f009  ce f1 25     LDX #SFE ; DGG - VECTORED SWI ROUTINE
   f00c  ff ef 17     STX SWIPTR
+
   f00c  ff ef 17     STX SWIPTR
   f00f  ff ef 08     STX NIO
+
   f00f  ff ef 08     STX NIO
 
</pre>
 
</pre>
 +
 +
===== 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 ===
 
=== Arduino Driver ===

Latest revision as of 14:18, 21 April 2022

Tindie-mediums.png

FrontPanel02 P527-cropped-720px.jpg

Front Panel for 8-Bit Microprocessors v2[edit]

See here for Ver 1 - SMT version

Features[edit]

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[edit]

J2 - I2C Connector[edit]

  • 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[edit]

Legends[edit]

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

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

Top row controls[edit]

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[edit]

VHDL Driver[edit]

VHDL Entities[edit]

  • 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[edit]

  • Memory map for this configuration is
0x0000-0x7FFF - 32KB INTERNAL SRAM
0XEC00-0xEFFF - 1KB INTERNAL SRAM (SCRATCHPAD SRAM USED BY MIKBUG)
0xFC18-0xFC19 - VDU (serSelect J3 JUMPER REMOVED)
0xFC28-0xFC19 - ACIA
0xFC30-0xFC3F - Front Panel
0xF000-0xFFFF - MIKBUG ROM - Copied 4X

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

Halt CPU[edit]
  • Card comes up running SMITHBUG at 0xF000
  • 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[edit]
  • Enter address set mode by pressing SW24 SETADR pushbutton, LED will illuminate
  • Set address to 0xF000 by pressing A31, A30, A29, A28 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 0F001
  • Data will show 0x7F
  • Next INCADR values are as follows
   f000   8e ef 44      LDS #STACK
   f003   bf ef 0a      STS SP
   f006   7f ef 0d      CLR ECHO	; DGG - default to serial port echo on
   f009   ce f1 25      LDX #SFE	; DGG - VECTORED SWI ROUTINE
   f00c   ff ef 17      STX SWIPTR
   f00f   ff ef 08      STX NIO
Access SRAM[edit]
  • 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[edit]

Micro-Python[edit]

PSoC Control[edit]

  • Z80 example

C Code[edit]

Assembly Sheet[edit]

Front Panel V2 Assembly Sheet Rev 1