Search found 9 matches

by nickwest
Thu Oct 26, 2017 12:59 pm
Forum: OLED128 Display
Topic: writing .BMPs from SD to internal memory
Replies: 1
Views: 95

Re: writing .BMPs from SD to internal memory

Replying to my own post - another option would be to take advantage of the SAMD21's extra RAM and read each image from the SD card into RAM, then dumping the whole thing onto the screen. I think the current driver does it line by line, which might explain why it's a bit slow. And kudos to the Freetr...
by nickwest
Sun Oct 22, 2017 10:56 am
Forum: OLED128 Display
Topic: writing .BMPs from SD to internal memory
Replies: 1
Views: 95

writing .BMPs from SD to internal memory

Hi all, I'm trying to speed up the screen updates when writing BMPs (aren't we all!). I'm using a Sparkfun SAMD21 mini. It's an ARM M0 core, which I think is roughly the same as an Arduino Zero. The main benefit in this situation is that it has 256kB of program memory, so it should be able to hold t...
by nickwest
Wed Oct 18, 2017 11:53 pm
Forum: OLED128 Display
Topic: Newbie question - do I draw each frame
Replies: 1
Views: 104

Re: Newbie question - do I draw each frame

Try it! You won't break anything. If you have an oscilloscope you could set a pin high at the start of a drawing operation and then low at the end. Use your oscilloscope to measure the duration... because you can't always trust your eyes :-) Alternatively you could use a technique like at https://st...
by nickwest
Wed Oct 11, 2017 8:46 am
Forum: OLED128 Display
Topic: OLED128 movie cameo
Replies: 0
Views: 105

OLED128 movie cameo

According to Jeremy at Jaycar in Bondi Junction, they used to sell a lot of these screens to Fox Studios. Apparently the screens were used in props or sets for the most recent Alien movie... Has anyone seen the film and can confirm?
by nickwest
Sun Sep 10, 2017 7:14 am
Forum: OLED128 Display
Topic: Any issues running it off 3.3V?
Replies: 0
Views: 162

Any issues running it off 3.3V?

According to the product page, this board will run off 3.3v. Has anyone tried it? Are there any pitfalls I should be aware of?

Thanks!
by nickwest
Sat Dec 10, 2016 7:56 pm
Forum: OLED128 Display
Topic: corrupted display - signal noise?
Replies: 2
Views: 2947

Re: corrupted display - signal noise?

After some more testing, it looks like I was having a problem with using up RAM. I was using the example code to display a .BMP. It looks like the issue is with this part: BMP_Status result = oled.displayBMP(image, 0, 0); if(result != BMP_OK) { Serial.print("Error loading BMP "); Serial.println((int...
by nickwest
Sun Oct 09, 2016 11:17 am
Forum: OLED128 Display
Topic: Wiring to Bluz
Replies: 2
Views: 1693

Re: Wiring to Bluz

I think I understand what you mean - using the ICSP port is the same as wiring to PINs. The ICSP port on Arduinos is connected directly to the normal pins on the Arduino and they share the SPI bus. Have a look at the schematic at https://www.arduino.cc/en/uploads/Main/arduino-uno-schematic.pdf to sh...
by nickwest
Thu Oct 06, 2016 9:03 pm
Forum: OLED128 Display
Topic: corrupted display - signal noise?
Replies: 2
Views: 2947

Re: corrupted display - signal noise?

Nobody has ever seen this problem before? Any suggestions? I can't see any pattern to the issue - the number of frames I get before the image corruption and eventual freezing doesn't seem consistent. I'll try sending simple data straight from the arduino to the screen, to see if taking the SD card r...
by nickwest
Thu Sep 15, 2016 1:40 pm
Forum: OLED128 Display
Topic: corrupted display - signal noise?
Replies: 2
Views: 2947

corrupted display - signal noise?

Hi all, I see these bands of coloured "static" at the tops of my images when I display .BMPs. I'm updating the display about every second or so, and the first few updates are fine, then the noise appears, then a couple of frames later the arduino+screen hangs on the noisy image and has to be reset. ...