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Forum Index : Microcontroller and PC projects : Armmite-H7 V5.04.33: HDMI output

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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10070

Posted: 05:37pm 08 Oct 2018

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This version includes support for an HDMI monitor using a Raspberry-Pi Zero as the HDMI interface

2018-10-09_023933_Armmite1.3.zip

Pin connections between the two are 1:1 as per the 8-bit SSD1963 pinout in both cases with the exception of the RD pin so there are 8 data pins and 3 control lines (+ a ground connection).

Support includes full console functionality including edit, and transparent text but not BLIT or SPRITE.

the command to enable HDMI output on the Armmite H7 is:

OPTION LCDPANEL HDMI, hres, vres

hres and vres should be set to the same as the Pi.

The new version of the Pi-cromite software 5.04.24 that supports this is attached.

2018-10-09_032630_mmbasicjessie.zip

2018-10-09_032704_mmbasicstretch.zip

To put the Pi into the HDMI I/F mode do as follows:

rm .options
run the Pi-cromite software as normal (sudo ./mmbasic)
OPTION LCDPANEL HDMI
OPTION REMOTE 8

You should see the following screen:

You can return to the Pi-cromite Basic prompt by typing Ctrl-C
and cancel the remote functionality with

OPTION REMOTE 0

To configure the Pi to work correctly with your HDMI display you may need to edit the file "boot/config.txt"

for a 800x480 display insert the commands

hdmi_group=2
hdmi_mode=87
hdmi_cvt=800 480 60 6 0 0 0
hdmi_drive=1

for a 1920x1080 display as in the picture I've used

sdtv_mode=2
sdtv_aspect=3
hdmi_group=1
hdmi_mode=16
disable_overscan=1

for other formats google is your friend.

I will also make this functionality available on the MMX and as a loadable driver on the MM+ in the near future

Edited by matherp 2018-10-10

WhiteWizzard
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Joined: 05/04/2013
Location: United Kingdom
Posts: 2927

Posted: 07:32pm 08 Oct 2018

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Wow Peter, very impressive (yet again!) - you keep us very busy with new & exciting things to try out.

One Question: You mention above that this version does not support BLIT or SPRITE. Is this because it is 'not yet done', OR is it just technically not possible and/or feasible?

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10070

Posted: 08:14pm 08 Oct 2018

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Quote Is this because it is 'not yet done', OR is it just technically not possible and/or feasible?

Wouldn't sufficiently fast to be useful and worth programming, the best bus speed I've been able to achieve is 800Kbytes/second burst. Loading an 800x480 RGB888 picture takes 3.5 seconds.

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