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640x480x24bit display for DE2-115 board — Parallax Forums

640x480x24bit display for DE2-115 board

cgraceycgracey Posts: 14,206
edited 2013-04-17 16:58 in Propeller 2
Here's a program that runs on the DE2-115 board and uses the SDRAM driver to buffer a 24-bit display. Because the FPGA only goes 60MHz, it needs all the SDRAM bandwidth to feed the display, so a cog writes the buffer, then leaves it alone for display. The last section of code is the one that plots the pixels into the SDRAM. It uses QARCTAN to determine what color the pixel should be, based on its location:
'
' SDRAM Driver and 640x480 24bbp VGA Demo
'
DAT		org

		reps	#4,#1
		setptra	sdram_par		'write initial command list
		wrlong	h00000000,ptra++	'skip_done then sdram_address (x2)
		wrlong	h00000008,ptra++	'terminate with end_of_list

		setcog	#8
		coginit	sdram_adr,sdram_par	'launch SDRAM driver into cog1
		coginit	graph_adr,graph_par	'launch graph driver into cog2

		jmp	#vga

sdram_adr	long	driver<<2 + $E80
sdram_par	long	$E80

graph_adr	long	driver<<2 + $E80 + $D0
graph_par	long	$E80

h00000000	long	$00000000
h00000008	long	$00000008


'*******************************
'*  VGA 640 x 480 x 8:8:8 RGB  *
'*******************************

' P4 = VSYNC
' P3 = RED
' P2 = GREEN
' P1 = BLUE
' P0 = HSYNC

CON

  s = 44	'scales DAC output (s = 0..128)


DAT
		
vga		setptra	sdram_par		'set ptra

		setctra	#%00111			'set ctra for PLL*8
                setfrqa	frqa_			'set frqa

		setvid	#%0101			'set vid for vga output, negative hsync
		setvidy	vidy_			'set yiq coefficients
		setvidi	vidi_
		setvidq	vidq_

		cfgdacs	#%11_11_11_11		'set dacs to video mode

		setquad	#0			'address QUADs at 0..3
'
'
' Field loop
'
field		mov	pixel_ptr,#0		'reset SDRAM pixel pointer

		call	#read128		'issue SDRAM read command to prime buffer

		mov	x,#33			'top blanks
		call	#blank

                mov     x,lines_vis		'set visible lines

line	        call	#sync			'do horizontal sync

		mov	y,#5			'display 640 pixels

:pix4		call	#read128		'issue SDRAM read command to begin loading other buffer

		reps	#128/4,#8		'read 32 quads and push them into stack RAM
		waitvid	mode,#0			'issue VID command

		rdquad	ptrb++			'read a quad and push it
		nop
		nop
		nop
		pusha	0
		pusha	1
		pusha	2
		pusha	3

		notb	mode,#31		'toggle stack RAM offset in VID command

		djnz	y,#:pix4		'loop until 5 sets of 128 pixels (640 total)

	        djnz    x,#line           	'another line?

                mov     x,#10			'bottom blanks
		call	#blank

		clrp	#0			'do vertical sync
		mov	x,#2
		call	#blank
		setp	#0

                jmp     #field                  'field loop


blank		call	#sync			'blank lines
		waitvid	v640,sync_color0
		djnz	x,#blank
blank_ret	ret

sync						'horizontal sync
sync_ret	retd
		waitvid	v16,sync_color0
		waitvid	v96,sync_color1
		waitvid	v48,sync_color0
'
'
' Issue SDRAM read command for 128 pixels (1024 bytes)
'
read128		rdlong	t,ptra[0]		'wait for last SDRAM command done
		tjnz	t,#read128

		setptrb	sdram_cmd		'get current data ptr into ptrb

		xor	sdram_cmd,h200		'update command data ptr

read128_ret	retd				'delayed return

		wrlong	pixel_ptr,ptra[1]	'issue SDRAM address
		add	pixel_ptr,h200		'update pixel pointer
		wrlong	sdram_cmd,ptra[0]	'issue SDRAM read command


pixel_ptr	long	0
sdram_cmd	long	$1006			'128 pixels, toggle between $1006 and $1206
h200		long	$200
'
'
' Initialized data
'
frqa_		long	$0D6D_3A06		'25.175MHz

vidy_		long	$00_01_00_00 * s	'red gain
vidi_		long	$00_00_01_00 * s	'green gain
vidq_		long	$00_00_00_01 * s	'blue gain

		'	color base	mode		clocks/pixel	clocks/waitvid
mode		long	$00 << 24 +	$F << 20 +	1 << 13 +	128

lines_vis	long	480

sync_color0	long	$0_000000
sync_color1	long	$1_000000

v16		long	16
v96		long	96
v48		long	48
v640		long	640

t		long	0
x		long	0
y		long	0



driver						'SDRAM driver follows


'********************************
'*				*
'*  Propeller II SDRAM Driver	*
'*     for 16M x 16 devices	*
'*	  (FPGA version)	*
'*				*
'*  Version 0.1			*
'*  9 April 2013		*
'*  by Chip Gracey		*
'*				*
'********************************

{
SDRAM connections:

	P85 = cke (held high)		Port C
	P84 = cs
	P83 = ras
	P82 = cas
	P81 = we
	P80 = udqm (not used)
	P79 = ldqm (not used)
   P78..P77 = ba[1..0]
   P76..P64 = a[12..0]

   P63..P48 = dq[15..0]			Port B


  Note:	All pin directions have a 2-clock delay
	All pin outputs going to SDRAM have a 3-clock delay, since they are registered at the pin
	All pin inputs coming from SDRAM have a 2-clock delay, since they are registered at the pin


Commands (pairs of longs):

name		quads	bytes	hub_address (+0, set 2nd)			sdram_address (+1, set 1st)
------------------------------------------------------------------------------------------------------------------------
rw_1024		64	1024	%xxxx_xxxx_xxxx_xxxA_AAAA_AAAA_AAAA_W111	%xxxx_xxxA_AAAA_AAAA_AAAA_AA00_0000_0000
rw_512		32	 512	%xxxx_xxxx_xxxx_xxxA_AAAA_AAAA_AAAA_W110	%xxxx_xxxA_AAAA_AAAA_AAAA_AAA0_0000_0000
rw_256		16	 256	%xxxx_xxxx_xxxx_xxxA_AAAA_AAAA_AAAA_W101	%xxxx_xxxA_AAAA_AAAA_AAAA_AAAA_0000_0000
rw_128		 8	 128	%xxxx_xxxx_xxxx_xxxA_AAAA_AAAA_AAAA_W100	%xxxx_xxxA_AAAA_AAAA_AAAA_AAAA_A000_0000
rw_64		 4	  64	%xxxx_xxxx_xxxx_xxxA_AAAA_AAAA_AAAA_W011	%xxxx_xxxA_AAAA_AAAA_AAAA_AAAA_AA00_0000
rw_32		 2	  32	%xxxx_xxxx_xxxx_xxxA_AAAA_AAAA_AAAA_W010	%xxxx_xxxA_AAAA_AAAA_AAAA_AAAA_AAA0_0000
rw_16		 1	  16	%xxxx_xxxx_xxxx_xxxA_AAAA_AAAA_AAAA_W001	%xxxx_xxxA_AAAA_AAAA_AAAA_AAAA_AAAA_0000
skip_done	 0	   0	%0000_0000_0000_0000_0000_0000_0000_0000	%xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx
end_of_list	 0	   0	%0000_0000_0000_0000_0000_0000_0000_1000	%xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx


The driver scans a list for commands. Commands take two longs and are structured as hub_address + sdram_address. To have
the driver perform a read or write operation on the SDRAM, first set the sdram_address (2nd long) and then the hub_address
(1st long). The driver will set each hub_address long to skip_done (0) when its associated operation has completed.

Before starting the driver, build the command list structure with pairs of 0's, then terminate it with an 8. When launching
the driver into a cog, point the parameter (S) to the start of the command list.


Command list (longs):

	hub_address (skip_done/rw_xxxx)
	sdram_address

	hub_address (skip_done/rw_xxxx)
	sdram_address

	hub_address (skip_done/rw_xxxx)
	sdram_address

	...

	end_of_list
}

DAT		org
'
'
' Initialize SDRAM				clocks	hub	
'						----------------
sdram_driver	getptra	list			'1	-		save command list address

		reps	#6000,#1		'1	-		repeat instruction for 100us @60MHz
		mov	pinc,h003FFFFF		'1	-		cke and cs high
		mov	dirc,h003FFFFF	wz	'6000	-		set SDRAM signals to outputs (100us), Z = 0
'
'
' Scan list for commands
'
:finish	if_z	wrlong	cmd,ptra[-2]		'1	0		if command finished, set it to skip_done (cmd = 0)

		mov	pinc,h00240400		'1	1		issue 'precharge all' command
		setb	pinc,#20	wz	'1	2		deselect, Z = 0
:reset	if_z	setptra	list			'1	3		if end_of_list, reset list pointer; satisy Trp

		mov	pinc,h00200037		'1	4		issue 'set mode' command
		setb	pinc,#20		'1	5		deselect, satisfy Tmrd

		mov	pinc,h00226000		'1	6		issue 'auto refresh' command
		setb	pinc,#20		'1	7		deselect, satisfy Trfc in 8 more clocks

:next		rdlong	cmd,ptra++[2]	wz	'3	0..2		check command, point to next
		setptrb	cmd			'1	3		in case command, set hub address
	if_z	jmp	#:next			'1/4	4/4..7		if skip_done, next command

		decod3	cmd		wc	'1	5		decode size bits, C = write
		and	cmd,#%11111110	wz	'1	6		isolate bits 7..1, Z = 1 if end_of_list
	if_z	jmp	#:reset			'1/4	7/7..2		if end_of_list, reset list pointer
'
'
' Execute read/write command			clocks	hub	XFR write SDRAM		XFR read SDRAM
'						------------------------------------------------------
		rdlong	adr,ptra[-1]		'3	0..2	-			-			get SDRAM address

		shl	adr,#7			'1	3	-			-			make 'active' command with bank and row address
		or	adr,#%1_0011_00		'1	4	-			-			(ba[1..0], a[12..0]) = adr[24..10]
		rol	adr,#15			'1	5	-			-

		mov	pinc,adr		'1	6	-			-			issue 'active' command
		setb	pinc,#20		'1	7	-			-			deselect, satisfy Trcd in 1 more clock

	if_c	rdquad	ptrb++			'1	0	-			-			if write, read initial QUADs from hub

		setbc	:quad,#0		'1	1	-			-			set wrquad/rdquad according to read/write

	if_c	setxfr	#%010_011		'1	2	<QUADs_to_16_pins>	-			if write, configure XFR at hub cycle 2

		shr	adr,#22+1		'1	3	-			-			make blank command with bank and column address
		and	pinc,h00306000		'1	4	-			-			(ba[1..0], a[12..0]) = (adr[24..23], %0000, adr[9..1])
		or	pinc,adr		'1	5	-			-

	if_c	mov	dirb,hFFFF0000		'1	6	-			-			if write, enable data outputs

	if_nc	setxfr	#%100_011		'1	7				<16_pins_to_QUADs>	if read, configure XFR at hub cycle 7

	if_nc	xor	pinc,h001A0000		'1	0	-			-			if read, issue 'read' command
	if_nc	setb	pinc,#20		'1	1	-			-			if read, deselect

	if_c	xor	pinc,h00180000		'1	2	-			-			if write, issue 'write' command (aligns with XFR on next clock)
	if_c	setb	pinc,#20		'1	3	output QUAD0 w0		-			if write, deselect; read: SDRAM sees 'read' command

		shr	cmd,#1			'1	4	output QUAD0 w1		-			get loop count

	if_nc	nop	#7			'1	5	output QUAD1 w0		-			if read, pad time
		'(nop)				'1	6	(skip to next hub 6)	-			read: SDRAM starts outputting data stream
		'(nop)				'1	7				-
		'(nop)				'1	0				input w0		read: SDRAM data stream begins arriving in XFR
		'(nop)				'1	1				input w1 -> QUAD0
		'(nop)				'1	2				input w0
		'(nop)				'1	3				input w1 -> QUAD1
		'(nop)				'1	4				input w0

:quad		'(rdquad/wrquad)		'1	5	output QUAD1 w0		input w1 -> QUAD2
		'(rdquad/wrquad)		'1	6	output QUAD1 w1		input w0
		'(rdquad/wrquad)		'1	7	output QUAD2 w0		input w1 -> QUAD3
		rdquad	ptrb++			'1	0	output QUAD2 w1		input w0		write: read next QUADS; read: write current QUADS
		djnz	cmd,#:quad		'1	1	output QUAD3 w0		input w1 -> QUAD0	loop for each set of QUADs
		'(djnz looping)			'1	2	output QUAD3 w1		input w0
		'(djnz looping)			'1	3	output QUAD0 w0 (new)	input w1 -> QUAD1	write: RDQUAD data valid
		'(djnz looping)			'1	4	output QUAD0 w1		input w0

		mov	pinc,h002C0000		'1	2	output QUAD3 w1		-			issue 'burst terminate' command (aligns with XFR on next clock)
		mov	dirb,#0		wz	'1	3	-			-			cancel data outputs (aligns with 'burst terminate'), Z=1
		jmp	#:finish		'4	4..7	-			-			finish up, scan for next command
'
' Constants
'
h00180000	long	$00180000		'write' command toggle
h001A0000	long	$001A0000		'read' command toggle
h00200037	long	$00200037		'set mode' command (full-page r/w bursts, cas latency = 3)
h00226000	long	$00226000		'read' command mask
h00240400	long	$00240400		'precharge all' command
h002C0000	long	$002C0000		'burst terminate' command
h00306000	long	$00306000		'blank command mask
h003FFFFF	long	$003FFFFF		'control pins mask
hFFFF0000	long	$FFFF0000		'data pins mask
'
'
' Variables
'
list		res	1			'command list pointer
cmd		res	1			'command
adr		res	1			'address





'
'
'************************
'*			*
'*	Graphics	*
'*			*
'************************
'
' The following program uses SDRAM driver command slot 1 to write the video display (640x480 longs)
'
		org				'graphics driver

graph		setpix	pix_			'set 1x1 1-bit texture

		setpixr	pixrgb			'reset pix rgb scaling registers
		setpixg	pixrgb
		setpixb	pixrgb

		pusha	color0			'install texture colors into stack ram at $00 and $01
		pusha	color1

		setquad	#0			'init QUADs pointer to #0
		fixinda	#3,#0
'
'
' Draw screen left-to-right/top-to-bottom
'
:pixel		mov	xx,xpos			'compute complex arctan of coordinates
		sub	xx,#640/2

		mov	yy,ypos
		sub	yy,#480/2

		qarctan	xx,yy
		getqx	xx
		getqz	zz

		max	xx,#511			'make luma from length
		shl	xx,#23
		testb	xx,#31		wc
		setbc	texture,#0		'set black/white

		qsincos	xx,hsincos		'convert length to sinusoid
		getqx	yy
		add	yy,#$80

		shl	yy,#8			'set alpha blend
		setpixa	yy

		shl	yy,#16			'swirl colors
		add	zz,yy

		call	#chroma			'make chroma from angle
		mov	pix,z
		add	zz,h55555555
		call	#chroma
		shl	z,#8
		or	pix,z
		add	zz,h55555555
		call	#chroma
		shl	z,#16
		or	pix,z

		nop	#2			'blend chroma with black or white
		nop	#2
		getpix	pix

		call	#plot			'plot pixel

	if_nc	jmp	#:pixel			'if more pixels, loop

		jmp	#$
'
'
' Get chroma from 32-bit angle
'
chroma		qsincos	zz,hsincos
		getqx	z
		add	z,#$80

chroma_ret	ret

hsincos		long	77			'127 * 0.607
h55555555	long	$55555555		'1/3 circle
'
'
' Plot next pixel, C=1 if end of screen
'
plot		mov	inda++,pix		'store pixel in QUADs
		incmod	qptr,#3		wc	'QUADs full?
	if_nc	jmp	#plot_ret		'if not, return

:wait		rdlong	z,ptra[2]		'QUADs full, wait for last command to finish
		tjnz	z,#:wait

		wrquad	pcmd			'write QUADs
		wrlong	pptr,ptra[3]		'write SDRAM address
		wrlong	pcmd,ptra[2]		'write SDRAM command
		add	pptr,#$10		'update SDRAM address

plot_ret	retd
		incmod	xpos,xlim	wc	'increment position
	if_c	incmod	ypos,ylim	wc
	if_c	mov	pptr,#0			'if end-of-screen, reset pixel pointer
'
'
' Variables
'
pcmd		long	$1409

pix		long	0
z		long	0

xx		long	0
yy		long	0
zz		long	0

pptr		long	0
qptr		long	0

xlim		long	640-1
ylim		long	480-1

xpos		long	0
ypos		long	0

pixrgb		long	$0000_FF00

color0		long	$FF_00_00_00	'solid black
color1		long	$FF_FF_FF_FF	'solid white

		'       1 x 1 map, 1-bit pixels, no mirroring
pix_		long	%000_000_00_0_00 << 21 + $00 << 9 + texture

texture		long	0		'1x1 1-bit texture

I'd put a picture of it up, but my camera's batteries are dead.

Comments

  • roglohrogloh Posts: 5,837
    edited 2013-04-13 02:32
    Nice. I wish I could see it.
  • cgraceycgracey Posts: 14,206
    edited 2013-04-13 02:35
    rogloh wrote: »
    Nice. I wish I could see it.

    Maybe someone can take a screen shot.
  • RaymanRayman Posts: 14,755
    edited 2013-04-13 04:09
    Sounds great! I imagine spirals on the screen...

    I guess you're saying that at 180 MHz clock there'd be time during refresh or something to update SRAM?
    No chance of changing SRAM during active display time right? Or, is there?

    Could the DE0 show color bars or something in this mode?
  • nutsonnutson Posts: 242
    edited 2013-04-13 07:05
    How do I load the .BIN most easily file? Do I need p2load or can I do it with Andy's propterminal??
  • cgraceycgracey Posts: 14,206
    edited 2013-04-13 09:38
    nutson wrote: »
    How do I load the .BIN most easily file? Do I need p2load or can I do it with Andy's propterminal??

    Woops! Never mind that .BIN file. I meant to load the .SPIN file there. I'll just delete the .BIN and you can copy and paste that source code into PNUT to run it.
  • cgraceycgracey Posts: 14,206
    edited 2013-04-13 09:43
    Rayman wrote: »
    Sounds great! I imagine spirals on the screen...

    I guess you're saying that at 180 MHz clock there'd be time during refresh or something to update SRAM?
    No chance of changing SRAM during active display time right? Or, is there?

    Could the DE0 show color bars or something in this mode?

    There's no time at 60MHz to update the display, but at 180MHz, you could write it twice over for every display period.

    The VGA demo I made a while ago does color bars, but has no need for all-points-addressable graphics, so it runs on the DE0.
  • nutsonnutson Posts: 242
    edited 2013-04-13 10:34
    Works fine (after reprogramming the DE2-115). Thanks Chip
    1024 x 768 - 43K
  • cgraceycgracey Posts: 14,206
    edited 2013-04-13 20:23
    nutson wrote: »
    Works fine (after reprogramming the DE2-115). Thanks Chip

    Thanks for posting that pic.

    Tonight I'll reduce the resolution to 320x240 so that I can potentially write the bitmap 3x over per display period. Then, I'll have the graphics cog animate the colors and patterns.

    I was surprised I was able to get such rich analog-looking effects using a few CORDIC functions. Potatohead, Pedward, Sapieha, all you with DE2-115's, have you run this program and played around with the code that draws the image? Having transcendental functions in hardware makes wild things possible.
  • pedwardpedward Posts: 1,642
    edited 2013-04-13 22:55
    I don't have a DE2-115 :frown:

    You could always send me one, I'm at my limit of what I can develop in one COG, since I've been hitting a lot of cycle limits on what I've been tinkering with. I'll post my color TTY text driver in a moment and give some details on what I learned.
  • SapiehaSapieha Posts: 2,964
    edited 2013-04-14 00:21
    Hi Chip.

    I have started and look --- But not played with it.

    My Basic eat up all my time.

    cgracey wrote: »
    Thanks for posting that pic.

    Tonight I'll reduce the resolution to 320x240 so that I can potentially write the bitmap 3x over per display period. Then, I'll have the graphics cog animate the colors and patterns.

    I was surprised I was able to get such rich analog-looking effects using a few CORDIC functions. Potatohead, Pedward, Sapieha, all you with DE2-115's, have you run this program and played around with the code that draws the image? Having transcendental functions in hardware makes wild things possible.
  • cgraceycgracey Posts: 14,206
    edited 2013-04-14 02:40
    Here's an animated version:

    SDRAM_Graphics6.spin

    It renders 26 frames into SDRAM which takes ~20 seconds before you get a stable image. It uses almost all of the 32MB SDRAM.
  • nutsonnutson Posts: 242
    edited 2013-04-14 03:16
    Nice !! (and hallucinating). I have one issue with your code: my version of Pnut does not accept "fixinda #3, #0", I have to change that into "fixinda 3,0", probably I have an older version of Pnut. Can you point me to the latest one?
  • potatoheadpotatohead Posts: 10,261
    edited 2013-04-14 04:38
    Chip, I toyed with this a little, and it made me think of fractals, which I'm posting up on another thread... The animated one is really trippy!
  • cgraceycgracey Posts: 14,206
    edited 2013-04-14 09:02
    nutson wrote: »
    Nice !! (and hallucinating). I have one issue with your code: my version of Pnut does not accept "fixinda #3, #0", I have to change that into "fixinda 3,0", probably I have an older version of Pnut. Can you point me to the latest one?

    I don't remember where I put it and I'm not in the office right now, so I'm unable to repost it. I'll post it to a sticky thread later today.
  • pedwardpedward Posts: 1,642
    edited 2013-04-14 09:06
    YEah, your nop #7 syntax doesn't work on the version I have either.
  • cgraceycgracey Posts: 14,206
    edited 2013-04-14 09:11
    Well, it's in a .zip file posted in this forum somewhere.
  • BaggersBaggers Posts: 3,019
    edited 2013-04-14 09:19
    @pedward, in my thread, P2Prep, there's a copy of PNut.exe in a few of the zips on the first post.
  • pedwardpedward Posts: 1,642
    edited 2013-04-14 14:02
    All of those are Dec 4th dated, and I have that version, which doesn't do the NOP immediate syntax.

    I have:

    69f9b0e3a64744c08723feef212d7349 ./PNut.exe
    69f9b0e3a64744c08723feef212d7349 ./tty/PNut.exe
    69f9b0e3a64744c08723feef212d7349 ./baggers/DE0/PNut.exe
    69f9b0e3a64744c08723feef212d7349 ./baggers/JB_Sprites_DE0/PNut.exe

    That's the MD5 sum of the file.
  • potatoheadpotatohead Posts: 10,261
    edited 2013-04-14 14:21
    Here is the one I used: Somewhere indeed! Right here :) We really should number these things or something. I've taken to packaging the Pnut used to build something, with that something. Lots of Pnuts....
    PNut.zip 318.8K
  • pedwardpedward Posts: 1,642
    edited 2013-04-14 14:24
    That's the same version I have, but the NOP immediate syntax does not result in repeated NOPs like Chip's code.
  • SapiehaSapieha Posts: 2,964
    edited 2013-04-14 14:32
    Hi pedward.

    I think You look on that instruction.
    000011 ZCN 1 CCCC nnnnnnnnn 010100000   |   NOPX        |   D/#n    | Repeat the NOP instruction the value in register “D(0-511)”
                                                                        | or “n(0-511)” times. (Time delay)
    
    
    pedward wrote: »
    That's the same version I have, but the NOP immediate syntax does not result in repeated NOPs like Chip's code.
  • potatoheadpotatohead Posts: 10,261
    edited 2013-04-14 14:35
    Well Smile!
  • pedwardpedward Posts: 1,642
    edited 2013-04-14 14:43
    From the SDRAM driver:
    	if_nc	nop	#7			'1	5	output QUAD1 w0		-			if read, pad time
    		'(nop)				'1	6				-			read: SDRAM starts outputting data stream
    		'(nop)				'1	7				-
    		'(nop)				'1	0				input w0		read: SDRAM data stream begins arriving in XFR
    		'(nop)				'1	1				input w1 -> QUAD0
    		'(nop)				'1	2				input w0
    		'(nop)				'1	3				input w1 -> QUAD1
    		'(nop)				'1	4				input w0
    
  • SapiehaSapieha Posts: 2,964
    edited 2013-04-14 15:22
    Hi pedward.

    PNut I have compile that.

    pedward wrote: »
    From the SDRAM driver:
    [U][B]    if_nc    nop    #7            '1    5    output QUAD1 w0        -            if read, pad time[/B]
    [/U]        '(nop)                '1    6                -            read: SDRAM starts outputting data stream
            '(nop)                '1    7                -
            '(nop)                '1    0                input w0        read: SDRAM data stream begins arriving in XFR
            '(nop)                '1    1                input w1 -> QUAD0
            '(nop)                '1    2                input w0
            '(nop)                '1    3                input w1 -> QUAD1
            '(nop)                '1    4                input w0
    
  • Cluso99Cluso99 Posts: 18,069
    edited 2013-04-14 18:20
    This is the pnut that I use and is apparently dated 21 Dec 2012
    PNut_20121221.zip

    As soon as I know which is the latest, I will update the sticky with a link to it.
  • pedwardpedward Posts: 1,642
    edited 2013-04-14 18:38
    Ok, so the Dec 4th compiler with the MD5 signature above does support NOP #immediate, I just profiled it and confirmed.

    However it doesn't support NOPX, which is supposed to be the same instruction.

    IMG_20130414_183938_898.jpg
    1024 x 768 - 170K
  • nutsonnutson Posts: 242
    edited 2013-04-17 13:05
    A quick video of the amazing SDRAM graphics example

    http://youtu.be/vS8jVrSbs7k

    Sorry for the bad quality, my camera refuses to autofocus on the LCD screen
  • Bill HenningBill Henning Posts: 6,445
    edited 2013-04-17 16:58
    Chip,

    I finally had time to re-flash my de2...

    Your demo is amazing!

    I think I'll have some time tomorrow to start on some high resolution SDRAM drivers :)
    cgracey wrote: »
    Here's an animated version:

    SDRAM_Graphics6.spin

    It renders 26 frames into SDRAM which takes ~20 seconds before you get a stable image. It uses almost all of the 32MB SDRAM.
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