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

Are the images slow when running the MP3? Or without? also what is the clock speed for the SPI interface? It may be the Arduino is 8 Mhz trying to drive the SPI fast and MP3... A video could help here...

Clem

ok i will do so within a few hours i am not currently at my working station.

no the image was not slow when running the mp3. I did not set any clock speed, its in its standard clock speed. thank you.

Can you drop the sketch here? It may need some optimization.

Clem

i mean it always been slow. I haven't been able to make it run any faster. i will give you the sketch to have a look at. is it possible to email it to you ?

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!

What class is SD card?

Edited: After looking through the code I can see a lot of things to try to improve the code. But realize it will take me a while to test them. Luckily I have an Arduino to use, but not your lcd. I plan on looking into the low level at times abd how much resources are left. Can you give me a few days?

What level of the Arduino IDE are you using and level of Windows?

Thanks,

Clem

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