Search found 624 matches

by ag123
Tue Jun 20, 2017 7:15 am
Forum: Projects
Topic: Blue Pill breakout board ?
Replies: 10
Views: 140

Re: Blue Pill breakout board ?

it sounds like a 'shield' but yet isn't exactly a 'shield', i'm thinking perhaps generic perf boards may help? i'm using mainly (baite) maple mini, currently i'm resorting to 'dupont' wires connections, i've been looking for various similar solutions as a lot of those things i use are breakout modul...
by ag123
Thu Jun 15, 2017 8:05 am
Forum: General discussion
Topic: VGA Space invaders on bluepill
Replies: 45
Views: 661

Re: VGA Space invaders on bluepill

Say 400x200pixels, 8bits per pixel (256 colors), 4x 2bit R2R VGA DAC. You need 80kB video buffer, which fits inside F407. You get maybe 50us to shoot out 400pixels or bytes. That is 125ns per pixel. That is an 8MHz byte stream off the gpio. ZX80/81: The ZX81 did not use pixels resolution, but 8x8 f...
by ag123
Wed Jun 14, 2017 12:34 pm
Forum: General discussion
Topic: VGA Space invaders on bluepill
Replies: 45
Views: 661

Re: VGA Space invaders on bluepill

i'm thinking with $2 for each BP/MM it may even be possible to say hook up 2 pieces of it say via spi and one of the bluepill can be dedicated in managing the vga display. so we have a BP/MM running as a 'VGA card' and the other could do dedicated game logic, etc. this would allow 1 BP/MM to use mos...
by ag123
Wed Jun 14, 2017 10:15 am
Forum: General discussion
Topic: VGA Space invaders on bluepill
Replies: 45
Views: 661

Re: VGA Space invaders on bluepill

yup this would fit the '1-bit' colors or rather 8 colors scenario the binary combination of each color signal R, G, B would give 8 color combinations at 3 bits per pixel, 640x480x3/8 ~ 115,200 bytes for the screen buffer my thoughts are that this seem 'easier' on an f407 chip with a good amount of s...
by ag123
Wed Jun 14, 2017 10:10 am
Forum: General discussion
Topic: VGA Space invaders on bluepill
Replies: 45
Views: 661

Re: VGA Space invaders on bluepill

perhaps instead of full color VGA what seem possible may be '1-bit' colors i.e. feed 'digital 0.7v or zero' into the vga analog pins, but that'd need to run at 25mhz (40ns per bit), i'm not too sure if it is possible to hack 2 bits or 3 bits colors at those speeds even with 1 bit of each color R, G,...
by ag123
Wed Jun 14, 2017 9:02 am
Forum: General discussion
Topic: VGA Space invaders on bluepill
Replies: 45
Views: 661

Re: VGA Space invaders on bluepill

found a useful article http://lslwww.epfl.ch/pages/teaching/cours_lsl/ca_es/VGA.pdf -A VGA video signal contains 5 active signals: • horizontal sync: digital signal, used for synchronisation of the video • vertical sync: digital signal, used for synchronisation of the video • red (R): analog signal ...
by ag123
Sun Jun 11, 2017 12:47 pm
Forum: General discussion
Topic: VGA Space invaders on bluepill
Replies: 45
Views: 661

Re: VGA Space invaders on bluepill

+1 cool thanks! :D
by ag123
Sun Jun 11, 2017 12:26 pm
Forum: General discussion
Topic: Alternatives to Nextion displays?
Replies: 16
Views: 1413

Re: Alternatives to Nextion displays?

the idea about QT is the idea itself, QT has QML which pretty much *describes* a user interface http://doc.qt.io/qt-5/qmlreference.html hence, you would possibly say use a QT IDE to 'design' the look and feel of your app/sketch. then use a 'code generator' to translate the generated QML into C/C++ t...
by ag123
Sun Jun 11, 2017 11:38 am
Forum: General discussion
Topic: Partial / old code for a F4 Maple bootloader
Replies: 30
Views: 586

Re: Partial / old code for a F4 Maple bootloader

the problem with usb mass storage protocol is that in a normal sense the device is simply presented as a *block device*. the (FAT) file system is completely handled by the host o/s which could involve updating directory entries, cluster maps and bit maps. the host could literally try to 'write anywh...
by ag123
Sun Jun 11, 2017 9:43 am
Forum: Projects
Topic: Need a circuit to detect when engine running from OBD2
Replies: 25
Views: 462

Re: Need a circuit to detect when engine running from OBD2

@ag123 I dont know if RPM is sent by all ODB but it works on my Subaru. Though I think potentially that its not being "sent" but the phone app I'm using is probably constantly requesting RPM ( and other data depending on its configuration) A whole load of other data seems to be available e.g. speed...