Newhaven Display Forum

Hi Newhaven!

I'm working on a simple displaylist that has a few lines.
At a glance:

• Clear
• 2 bitmaps (L1 then L8) placed with vertex2f
• 3 white lines
• green lines:
  
  • 64 green lines work great. (attached as dl_working_trim.hex)
  • 65 or more green lines cause garbage to be drawn on the display (attached as dl_broken_trim.hex)

Confusingly, if I remove the L8 bitmap, I can draw 65+ green lines without a problem.  If you take a peek at the display lists (1 command per line) you'll see that the broken DL only adds 2 commands (corresponding to a pair of vertex2f invocations to drop another line in the LINES primitive mode, the 65th green line).  I need that L8 bitmap though :-)

The upper garbage red bar does not even smoothly make a rectangle.  Its top row begins ~80% scanned to the right and the bottom row ends ~60% scanned to the right (of the apparent red rectangle).  Both of the garbage bars occur beneath all the lines, and the change that causes them to appear is the uppermost line on the display.

I've attached pictures of the 64 and 65 states, as well as the display lists that produce them.  The display lists were pulled from display memory and stored locally as a straight binary byte-for-byte dump.  I processed them via `hexdump -ve '/4 "%08X\n"' working_displaylist.dump > dl_working.hex` and trimmed to the first 0x00000000 command (END_DISPLAYLIST).  The diff is as expected by adding one green line; near the end of the broken (65 green line) display list, there are 2 commands:
```
diff dl_working_trim.hex dl_broken_trim.hex
159a160,161
> 51381B80
> 51381B40
```

What's going on with this display list?



P.S.  I'm sorry, the forum does not permit attachment of non-image files.  I'll have to paste these text hex displays of the display lists:

Working 64 lines | Broken 65 lines 02000000 26000007 22000000 04000000 1F000001 05000000 07086E91 08136A91 01000000 451812B0 21000000 04400606 1F000001 05000000 071BC08D 0813C08D 01001F27 44701140 21000000 04808080 1F000003 0E000006 44F018C0 44F01C20 44F01C20 52E01C20 52E01C20 52E01410 0E000020 04063006 1F000003 45381B80 45381B40 45681B80 45681B40 45981B80 45981B40 45C81B80 45C81B40 45F81B80 45F81B40 46281B80 46281B40 46581B80 46581B40 46881B80 46881B40 46B81B80 46B81B40 46E81B80 46E81B40 47181B80 47181B40 47481B80 47481B40 47781B80 47781B40 47A81B80 47A81B40 47D81B80 47D81B40 48081B80 48081B40 48381B80 48381B40 48681B80 48681B40 48981B80 48981B40 48C81B80 48C81B40 48F81B80 48F81B40 49281B80 49281B40 49581B80 49581B40 49881B80 49881B40 49B81B80 49B81B40 49E81B80 49E81B40 4A181B80 4A181B40 4A481B80 4A481B40 4A781B80 4A781B40 4AA81B80 4AA81B40 4AD81B80 4AD81B40 4B081B80 4B081B40 4B381B80 4B381B40 4B681B80 4B681B40 4B981B80 4B981B40 4BC81B80 4BC81B40 4BF81B80 4BF81B40 4C281B80 4C281B40 4C581B80 4C581B40 4C881B80 4C881B40 4CB81B80 4CB81B40 4CE81B80 4CE81B40 4D181B80 4D181B40 4D481B80 4D481B40 4D781B80 4D781B40 4DA81B80 4DA81B40 4DD81B80 4DD81B40 4E081B80 4E081B40 4E381B80 4E381B40 4E681B80 4E681B40 4E981B80 4E981B40 4EC81B80 4EC81B40 4EF81B80 4EF81B40 4F281B80 4F281B40 4F581B80 4F581B40 4F881B80 4F881B40 4FB81B80 4FB81B40 4FE81B80 4FE81B40 50181B80 50181B40 50481B80 50481B40 50781B80 50781B40 50A81B80 50A81B40 50D81B80 50D81B40 51081B80 51081B40 21000000 23000000 00000000 02000000 26000007 22000000 04000000 1F000001 05000000 07086E91 08136A91 01000000 451812B0 21000000 04400606 1F000001 05000000 071BC08D 0813C08D 01001F27 44701140 21000000 04808080 1F000003 0E000006 44F018C0 44F01C20 44F01C20 52E01C20 52E01C20 52E01410 0E000020 04063006 1F000003 45381B80 45381B40 45681B80 45681B40 45981B80 45981B40 45C81B80 45C81B40 45F81B80 45F81B40 46281B80 46281B40 46581B80 46581B40 46881B80 46881B40 46B81B80 46B81B40 46E81B80 46E81B40 47181B80 47181B40 47481B80 47481B40 47781B80 47781B40 47A81B80 47A81B40 47D81B80 47D81B40 48081B80 48081B40 48381B80 48381B40 48681B80 48681B40 48981B80 48981B40 48C81B80 48C81B40 48F81B80 48F81B40 49281B80 49281B40 49581B80 49581B40 49881B80 49881B40 49B81B80 49B81B40 49E81B80 49E81B40 4A181B80 4A181B40 4A481B80 4A481B40 4A781B80 4A781B40 4AA81B80 4AA81B40 4AD81B80 4AD81B40 4B081B80 4B081B40 4B381B80 4B381B40 4B681B80 4B681B40 4B981B80 4B981B40 4BC81B80 4BC81B40 4BF81B80 4BF81B40 4C281B80 4C281B40 4C581B80 4C581B40 4C881B80 4C881B40 4CB81B80 4CB81B40 4CE81B80 4CE81B40 4D181B80 4D181B40 4D481B80 4D481B40 4D781B80 4D781B40 4DA81B80 4DA81B40 4DD81B80 4DD81B40 4E081B80 4E081B40 4E381B80 4E381B40 4E681B80 4E681B40 4E981B80 4E981B40 4EC81B80 4EC81B40 4EF81B80 4EF81B40 4F281B80 4F281B40 4F581B80 4F581B40 4F881B80 4F881B40 4FB81B80 4FB81B40 4FE81B80 4FE81B40 50181B80 50181B40 50481B80 50481B40 50781B80 50781B40 50A81B80 50A81B40 50D81B80 50D81B40 51081B80 51081B40 51381B80 51381B40 21000000 23000000 00000000

This display is awesome!  I've referenced FTDI's FT81x Series Programmers Guide and implemented a display library, asset management and lightweight display stack for RGB565.  I have a couple needs for small, high quality transparent Paletted8 bitmaps, however.  Here are the bytes that are written to memory, line:[ ] pixel: ():

[ (ff 00 00 ff) (00 ff 00 ff) (00 00 ff ff) ]    [ (ff ff ff 00) (ff ff ff 80) (ff ff ff 00) ]

This is supposed to be RGBA, 3px wide by 2px high.
Top row goes red, green, blue.
Bottom row goes transparent, halfway white transparent, transparent.

On the display there's just garbage.  What is the proper way to store in memory and display a Paletted8 bitmap on EVE2?

display_list.begin(bitmaps));
display_list.bitmap_handle(0));
display_list.bitmap_layout(BitmapFormat::Paletted8, width, height));
display_list.bitmap_size(BitmapFilter::nearest, BitmapWrap::border, BitmapWrap::border, width, height));
display_list.bitmap_source(bitmap_location));

// Alpha
display_list.blend(BlendFunction::one, BlendFunction::zero));
display_list.color_mask(0, 0, 0, 1));
display_list.palette_source(bitmap_location + 3));
display_list.vertex2ii(x, y, 0));
display_list.blend(BlendFunction::dst_alpha, BlendFunction::one_minus_dst_alpha));

// Red
display_list.color_mask(1, 0, 0, 0));
display_list.palette_source(bitmap_location));
display_list.vertex2ii(x, y, 0));

// Green
display_list.color_mask(0, 1, 0, 0));
display_list.palette_source(bitmap_location + 1));
display_list.vertex2ii(x, y, 0));

// Blue
display_list.color_mask(0, 0, 1, 0));
display_list.palette_source(bitmap_location + 2));
display_list.vertex2ii(x, y, 0));

Regular 565 2 bytes per pixel works great.  I've got animations and counters working great already, just need to figure out how to draw an RGBA8888 image :-)

I found FTDI's tool for converting PNG's to palette8.  It seems to be broken though - it won't open any png file I can find.  "invalid input file" on anything I've produced or found on the Internet.  I just need the file format and I'll make my own tool!!  What does a palette & index bytewise schema look like?

Hi Newhaven folks,

I'm following the FT81x Series Programmer Guide and the DS_FT81x datasheet to set my Newhaven display up and running.  I've been stuck for several days trying to get a hello world working.

My first test is to make a red circle on the screen.  It works very rarely and sometimes makes the circle the wrong size or at the bottom of the screen, sometimes it's only 1/2 or 1/4 circle.  Re-running startup randomly makes the screen kind of work, but the red dot location, size and presence is completely random.

• 10mhz single SPI.
• FTDI internal 12mhz crystal, not using external crystal.  (should I?)
• Particle Photon microcontroller.

Here's what I'm writing to the display, with comments.  I write to the display, then read back what I wrote in a follow-up transaction to see if it "took" properly.  First column is "milliseconds since bootup."

0000004092 [app.ft81x.display] INFO: wrote to register: 0x34, wrote: 0x00000320, read: 0x00000320.  good // Sets HSIZE=800
0000004092 [app.ft81x.display] INFO: wrote to register: 0x2c, wrote: 0x000003a0, read: 0x000003a0.  good // Sets HCYCLE=928
0000004093 [app.ft81x.display] INFO: wrote to register: 0x30, wrote: 0x00000058, read: 0x00000058.  good // Sets HOFFSET=88
0000004093 [app.ft81x.display] INFO: wrote to register: 0x38, wrote: 0x00000000, read: 0x00000000.  good // Sets HSYNC0=0
0000004094 [app.ft81x.display] INFO: wrote to register: 0x3c, wrote: 0x00000030, read: 0x00000030.  good // Sets HSYNC1=48
0000004095 [app.ft81x.display] INFO: wrote to register: 0x48, wrote: 0x000001e0, read: 0x000001e0.  good // Sets VSIZE=480
0000004095 [app.ft81x.display] INFO: wrote to register: 0x40, wrote: 0x0000020d, read: 0x0000020d.  good // Sets VCYCLE=525
0000004096 [app.ft81x.display] INFO: wrote to register: 0x44, wrote: 0x00000020, read: 0x00000020.  good // Sets VOFFSET=32
0000004096 [app.ft81x.display] INFO: wrote to register: 0x4c, wrote: 0x00000000, read: 0x00000000.  good // Sets VSYNC0=0
0000004097 [app.ft81x.display] INFO: wrote to register: 0x50, wrote: 0x00000003, read: 0x00000003.  good // Sets VSYNC1=3
0000004097 [app.ft81x.display] INFO: wrote to register: 0x6c, wrote: 0x00000001, read: 0x00000001.  good // Sets PCLK_POL=1 (falling edge, this is a curious setting in Newhaven's documentation)
0000004098 [app.ft81x.display] INFO: wrote to register: 0x68, wrote: 0x00000001, read: 0x00000001.  good // Sets CSPREAD=1
0000004098 [app.ft81x.display] INFO: wrote to register: 0x60, wrote: 0x00000001, read: 0x00000001.  good // Sets DITHER=1
0000004099 [app.ft81x.display] INFO: wrote to register: 0x64, wrote: 0x00000000, read: 0x00000000.  good // Sets SWIZZLE=0
0000004099 [app.ft81x.display] INFO: wrote to register: 0xd4, wrote: 0x00000080, read: 0x00000080.  good // Sets backlight PWM=128 (fully on)
0000004100 [app.ft81x.display] INFO: Settings are set.
0000004100 [app.ft81x.display] INFO: Waited 0ms for display list after register init.                           // This loops to wait for REG_DLSWAP's value to be 0
0000004101 [app.ft81x.display] INFO: Wrote display list: 0, command: 0x04000000, written: 0x04000000.  good // color_rgb(0,0,0) (display list number is (dl_offset)/4 for more convenient log reading)
0000004101 [app.ft81x.display] INFO: Wrote display list: 1, command: 0x26000007, written: 0x26000007.  good // clear(all)
0000004101 [app.ft81x.display] INFO: wrote to register: 0x54, wrote: 0x00000002, read: 0x00000002.  good // Writes 2 to REG_DLSWAP
0000004102 [app.ft81x.display] INFO: wrote to register: 0x70, wrote: 0x00000002, read: 0x00000002.  good // Sets PCLK=2 (Also a curious setting, FTDI programmer guide says this goes after the first display list)
0000004103 [app.ft81x.display] INFO: Waited 0ms for display list ready after initial clear display list. // This loops to wait for REG_DLSWAP's value to be 0
0000004103 [app.ft81x.display] INFO: Wrote display list: 0, command: 0x02000000, written: 0x02000000.  good // dl_ram+00 = color_rgb(0,0,0)
0000004104 [app.ft81x.display] INFO: Wrote display list: 1, command: 0x26000007, written: 0x26000007.  good // dl_ram+04 = clear(all)
0000004104 [app.ft81x.display] INFO: Wrote display list: 2, command: 0x04a01616, written: 0x04a01616.  good // dl_ram+08 = color_rgb(160,22,22)
0000004105 [app.ft81x.display] INFO: Wrote display list: 3, command: 0x0d000140, written: 0x0d000140.  good // dl_ram+12 = point_size(20+16)  (for a 40 pixel diameter circle)
0000004105 [app.ft81x.display] INFO: Wrote display list: 4, command: 0x1f000002, written: 0x1f000002.  good // dl_ram+16 = begin(point)
0000004106 [app.ft81x.display] INFO: Wrote display list: 5, command: 0x38085001, written: 0x38085001.  good // dl_ram+20 = vertex2ii(192,133,0,0)  (to try to drop the circle somewhere on the screen)
0000004106 [app.ft81x.display] INFO: Wrote display list: 6, command: 0x21000000, written: 0x21000000.  good // dl_ram+24 = end()
0000003908 [app.ft81x.display] INFO: wrote to register: 0x54, wrote: 0x00000002, read: 0x00000002.  good // Writes 2 to REG_DLSWAP
Am I interacting with the screen wrong?  Setting wrong settings?