Scrolling text is not smooth

[maxmurugan]

hi sir , Panel description Dimensions (in pixels) : 32x16 Scan factor: 1/4 Specifications Library version: 1.01 Platform: Pico

I try to using below setting and video file

https://github.com/board707/DMD_STM32/assets/4962604/39b253d4-a635-401f-9029-22d3d5240235

DMD_RGB <RGB32x16plainS4, COLOR_4BITS> dmd(mux_list, DMD_PIN_nOE, DMD_PIN_SCLK, custom_rgbpins, DISPLAYS_ACROSS, DISPLAYS_DOWN, ENABLE_DUAL_BUFFER);

[maxmurugan]

sm16208s 138 decoder ic

[maxmurugan]

please check

[board707]

Sorry, I am on vacation now. I will return after 20 March

Try RGB32x16_S4_VitaliyDKZ pattern

[maxmurugan]

ok

[board707]

Did you try the RGB32x16_S4_VitaliyDKZ pattern?

[maxmurugan]

tomorrow will check sir

[board707]

Please be patient, I will resolve this when return home after 20th March

[maxmurugan]

RGB32x16_S4_VitaliyDKZ this setting working fine

I am using Scrolling text speed is 20 middle of the going slow when compared to the start of the text please check video and code

if ((millis() - prev_step) > interval) { dmd.setTextColor(col[R1], bg); // --red color if (dmd.stepMarquee(-1, 0) & 1) { // if text is reached screen bounds dmd.clearScreen(true); Refresh =0; dmd.drawMarquee(Final_Message, strlen(Final_Message) , dmd.width() - 5, (dmd.height() > 0) ? 0 : 0, 0); } dmd.swapBuffers(true); prev_step = millis(); }

https://github.com/board707/DMD_STM32/assets/4962604/8c103844-b4c5-40fb-90d1-04edc369ab71

[maxmurugan]

When your free please check this code

[board707]

Ok

[tahafathi2013]

RGB32x16_S4_VitaliyDKZ this setting working fine

I am using Scrolling text speed is 20 middle of the going slow when compared to the start of the text please check video and code

if ((millis() - prev_step) > interval) { dmd.setTextColor(col[R1], bg); // --red color if (dmd.stepMarquee(-1, 0) & 1) { // if text is reached screen bounds dmd.clearScreen(true); Refresh =0; dmd.drawMarquee(Final_Message, strlen(Final_Message) , dmd.width() - 5, (dmd.height() > 0) ? 0 : 0, 0); } dmd.swapBuffers(true); prev_step = millis(); }

IMG_9825.MOV

HOW ITS WORKING?? WHAT IS PIN CONFIG? WHAT IS PANEL CONFIGS? I USE STM32 BLUEPIL BUT NOT WORKING ON RGB PANELS.64X32 16 S.

Please full code is working upload here.

[maxmurugan]

I am using Raspberry pi Pico

[board707]

When your free please check this code

What is the problem? As I understand, the pattern RGB32x16_S4_VitaliyDKZ is works with your panel?

[maxmurugan]

Scrolling text is not smooth from start to end

[board707]

Yes, I noticed that too in some modes on my panels. It seems to me that when you have all the text on panels, the controller simply does not have time to update it between scans. Unfortunately, I don't have a solution to this problem right now. I can only advise reducing the text speed.

[board707]

Hi @maxmurugan Please test a workaround to the "text is not smooth" problem. Your main scrolling code is:

if ((millis() - prev_step) > interval)
{
dmd.setTextColor(col[R1], bg); // --red color
if (dmd.stepMarquee(-1, 0) & 1) { // if text is reached screen bounds
dmd.clearScreen(true);
Refresh =0;
dmd.drawMarquee(Final_Message, strlen(Final_Message) , dmd.width() - 5, (dmd.height() > 0) ? 0 : 0, 0);
}
dmd.swapBuffers(true);
prev_step = millis();
}

Look at the code - the millis mark is updated at the very end, after the text has been shifted. This means that our update interval is not exactly 20ms, but 20ms + the time the controller needs to redraw the marquee. This time depends greatly on the number of letters on the screen. At the beginning and at the end there are only a couple of letters on the panel and everything is redrawn quickly, but in the middle you need to display all the text and this takes a long time. To eliminate unevenness, you need to move the time mark to the beginning of the cycle:

if ((millis() - prev_step) > interval)
{
prev_step = millis();
dmd.setTextColor(col[R1], bg); // --red color
if (dmd.stepMarquee(-1, 0) & 1) { // if text is reached screen bounds
dmd.clearScreen(true);
Refresh =0;
dmd.drawMarquee(Final_Message, strlen(Final_Message) , dmd.width() - 5, (dmd.height() > 0) ? 0 : 0, 0);
}
dmd.swapBuffers(true);

}

[maxmurugan]

sorry for delay i am trying today sir

[board707]

Did you trying the fix I suggested?

[maxmurugan]

sorry for delay

now get scrolling text smooth

[maxmurugan]

https://github.com/board707/DMD_STM32/assets/4962604/b79e2a5e-6d32-4aa7-8431-a24837e1c4e2

[maxmurugan]

Future Multiline scrolling possible?

[board707]

Thank you for your feedback.

Multiline scrolling possible?

This can be done with current code. Please open a new issue for it.