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starker
Joined: 01 Feb 2016
Posts: 7
Location: Brasil
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 Posted: Sun Apr 09, 2017 3:03 pm Post subject: ATmega128A + SSD1963 |
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Hello guys!
I'm using Google translate to translate this text, I hope you can understand. I'm from Brazil and I need help!
I downloaded the SSD1963 library with the sample programs (thank you Mrshilov for sharing your code), but I can not see any pictures on the screen.
I changed the settings in the program to be used with the ATmega128A, I can see the signals with the oscilloscope (which shows that the system works), but the brightness of the backlight decreases a lot when I turn on the microcontroller and maybe that's why I see nothing on the screen.
First I had put the CS, RS, RESET, WR pins in the PORTF, but not working. So I put it in the PORTD and then hear communication, but nothing appears on the screen.
What could be happening?
Actual configuration:
PORTA = low data
PORTC = higt data
PORTD.0 = wr_disp
PORTD.1 = rs_disp
PORTD.2 = cs_disp
PORTD.3 = res_disp
Thank you for any help!
Last edited by starker on Sun Apr 09, 2017 10:40 pm; edited 1 time in total |
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Mrshilov
Joined: 24 Jan 2009
Posts: 314
Location: Russia
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| Posted: Sun Apr 09, 2017 7:14 pm Post subject: |
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| RD pin must be connected to +3V3. |
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starker
Joined: 01 Feb 2016
Posts: 7
Location: Brasil
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| Posted: Sun Apr 09, 2017 11:56 pm Post subject: |
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Thank you Mrshilov for your reply!
I connected the RD pin to 3.3V and it's still in the same situation!
Another suggestion?
Thank you again! |
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Mrshilov
Joined: 24 Jan 2009
Posts: 314
Location: Russia
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| Posted: Mon Apr 10, 2017 12:31 am Post subject: |
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| Backlight of 5" LCD consume 120mA or more. Check power. |
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starker
Joined: 01 Feb 2016
Posts: 7
Location: Brasil
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| Posted: Mon Apr 10, 2017 12:52 am Post subject: |
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Thank you Mrshilov for your reply!
My LCD is 7" and is consuming 300mA. I am using a lab source for + 3V3 and + 5V. |
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Mrshilov
Joined: 24 Jan 2009
Posts: 314
Location: Russia
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| Posted: Mon Apr 10, 2017 1:09 am Post subject: |
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Check "Backlight control". It must be in "LED_A" position.
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starker
Joined: 01 Feb 2016
Posts: 7
Location: Brasil
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| Posted: Mon Apr 10, 2017 1:17 am Post subject: |
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Thank you Mrshilov for your support!
Yes!
It is set to LED_A. |
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Mrshilov
Joined: 24 Jan 2009
Posts: 314
Location: Russia
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| Posted: Mon Apr 10, 2017 1:56 am Post subject: Re: ATmega128A + SSD1963 |
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| starker wrote: | | ...the brightness of the backlight decreases a lot when I turn on the microcontroller... |
If "Backlight control" in "LED_A" position, backlight brightness must be the same. You need to check LCD. |
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starker
Joined: 01 Feb 2016
Posts: 7
Location: Brasil
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| Posted: Mon Apr 10, 2017 5:32 pm Post subject: |
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Thank you for your willingness to help me!
I checked all the connections on the display and they are running.
Probably this display has some problem.
I'll try to buy another one to test. I do not know yet when, but once I have another, I'll be posting the result here!
Thanks again! |
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Evert :-)
Joined: 18 Feb 2005
Posts: 2156
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starker
Joined: 01 Feb 2016
Posts: 7
Location: Brasil
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| Posted: Tue Apr 11, 2017 12:55 pm Post subject: |
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Thank you for your comment!
Yes! I disabled this fuse, but no success.
Thank you! |
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