RA8875 + 7'' TFT + ARDUINO UNO = WORKING having issues with images loading slow

I took a look at the video a few times. A few things puzzle me:

1. What is the board below the Arduino next to the speaker?

2. You say you are playing the MP3, but all I hear is static? That suggests the processor is busy with the SPI.

3. The data to the screen is painting slowly like the processor is feeding the data slowwlly. Did you say it is fast without the MP3?

4.Even though the Arduino is real time, you can overwhelm it when trying to do multiple things at once. The speed is 8 Mhz meaning instructions run at 125 Nanoseconds. 800x480x3 bytes per pixel=1.152 million bytes/ 100 seconds= 115.2K/second which sounds like the speed of serial interface. Are you running SPI for the video and at what speed?

5. I did not even factor the MP3 transfer. Is that running from the SDcard to Arduino and back out to the speaker.

6. Where is the data coming from to paint the screen?

Clem

adafruit mp3 break out board (https://www.adafruit.com/products/1381)

RA8875 (https://www.adafruit.com/product/1590)

7'' TFT (https://www.adafruit.com/products/2354)

Arduino UNO

-all the components are working with SPI interface (mosi,miso,sck)

-images were converted to BMP files with photoshop

-sound was also converted from m4a file to MP3 file

i conducted this experiment also with an SD Card a lone but it was still operating very slow (without the mp3 with sd card)

i email you the file. hopefully you can give me extremely good feed back to why this is the issue to correct. ive put quite of time trying to figure out what was the problem

i also hope that with your expertise you can help me. if it can be done it would be a really good achievement. i will also appreciate it a lot!

yes for sure, i have windows 8, and the ide 1.6.1

I need a quick test:

Find this line:

#define BUFFPIXEL 20

and change to

#define BUFFPIXEL 120

Please try it and let me know if you see any speed up?

Thanks,
Clem

No speed up in anyway. I have tried that in the past and still have the same results.

i did tried it again at 120 by the way.

That means the problem may not be in the code... That should have made at least a 4 fold speed increase. Do you have a oscilloscope? I wonder what is going on on the SPI bus to the LCD.

yes i do have an oscilloscope at my disposal !

what would you like me to test ? and what results would you think i should be receiving ?

I would like to see the MISO and MOSI on the SPI to the LCD. in particular if there are gaps in sending the information. Also what is the clock frequency... Visually we can determine how long the select is held high...

Thanks,

Clem

hello, i uploaded the video of how mosi looks like. is it possible to have your number ?

Sorry I cannot find video. Did you place it on element 14 site?  My number is personal no business.

Edit: Your video is currently encoding. It will be available soon.

Need to wait

Clem

Sorry I cannot find video. Did you place it on element 14 site?  My number is personal no business.

Edit: Your video is currently encoding. It will be available soon.

Need to wait

Clem