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Forum Index : Microcontroller and PC projects : SSD1963 5" odd behaviour with Picomite
| Author | Message | ||||
| LouisG Senior Member  Joined: 19/03/2016 Location: AustraliaPosts: 124 |
Hi Guys, I made up a piece of stripboard with connectors and cross-wiring to connect an unmodified 5" SSD1963 screen to a Picomite according to the instruction manual. I used exactly the Pico pins recommended and connected the (configurable) LED_A pin to Pico pin 11, which was available. The screen was configured using MMEdit as follows: Connected to COM4 at 38400 > Option List PicoMite MMBasic Version 5.07.07 OPTION LCDPANEL SSD1963_5, RLANDSCAPE,GP8 > Backlight 100 > I seem to be unable to get the LEDs in the screen to light. After triple checking the wiring I made the following tests: 1. I transferred the screen to an E100 board and the screen worked perfectly. 2. I swapped the Pico with another. Still no luck. 3. I noticed that the voltage on pin 11 (LED_A) was always 0V. To check this out I disabled the LCD panel as follows in order to output 3.3V from Pin 11: > Option LCDPanel disable Port: COM4 removed Port: COM4 inserted Connected to COM4 at 38400 > setpin 11, Dout > Pin(11) = 1 > The LEDs in the screen switched on! It appears I was not getting the PWM signal from Pin 11. What could be causing this? Wrong wiring? Bad command? Inappropriate LED_A pin? Any help would be appreciated. ... Louis |
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| matherp Guru  Joined: 11/12/2012 Location: United KingdomPosts: 9122 |
Please upload the latest release candidate and it should work. I think this is something I fixed when implementing the 8-bit parallel ILI9341 Edited 2023-10-22 17:31 by matherp |
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| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 124 |
Yes. I loaded version V5.07.08RC11. That fixed it. Working well. Thanks Matherp! ... Louis |
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| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 124 |
More odd behaviour. Still using V5.07.08RC11. Now GUI CALIBRATE doesn't respond properly when using the SSD1963_5. The screen with the first target comes up OK but when touched it throws a continuous stream of ERROR : TOUCH NOT CALIBRATED. I checked the screen in an E100 using GUI TEST TOUCH and it worked perfectly. Wiring rechecked too. Any ideas? FYI option list PicoMite MMBasic Version 5.07.08RC11 OPTION SYSTEM SPI GP10,GP11,GP12 OPTION LCDPANEL SSD1963_5, LANDSCAPE,GP8 OPTION GUI CONTROLS 11 OPTION TOUCH GP18,GP19 OPTION SDCARD GP22 > ... Louis |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Just wondering, have you tried stripping it down to basics? i.e. without specifying GP8, GUI CONTROLS and SDCARD. It shouldn't make any difference, but you never know. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9122 |
I have made changes in this area. Not at home until Friday, will test then |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9122 |
Just tested and works fine for me. There are two possibilities 1: Wiring error as always check and double-check including any wires that might be broken at terminations 2: Power. The 5" SSD display is very difficult to power. It only takes a 3.3V supply and wants a lot of power. It may well be outside the capability of the Pico power circuit to power it and the rest of the circuitry reliably. Try an external PSU with common ground to power the display |
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| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 124 |
Thanks Peter. Unfortunately it still doesn't work for me. 5.07.08RC12 loaded on Picomite. Here's what I did. OPTION RESET OPTION LCDPANEL SSD1963_5, L, 26 Command accepted. TEXT 100,100, "Hello",,,4 Text displayed OK. OPTION TOUCH 24,25 Accepted. Screen goes dark. LEDs still on. TEXT 100,100, "Hello",,,4 Accepted. Screen remains dark. LEDs still on. GUI CALIBRATE Command accepted. Screen remains dark. It should show a touch target. I touched the screen approximately where the first target should be. No response. I touched the screen a second time. "Error : Touch hardware failure" (single message). This cannot be (but it is!). The screen works perfectly in my E100 board. The various screen buttons respond correctly to touch, change colour, switch outputs, etc. I substituted a pair of AA cells (3V) for the screen 3.3V supply. It operated the LEDs but made no difference. Any ideas? Looks like I'll be checking the wiring for the (n+1)th time. Regards, Louis - |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
First, just check that you aren't mixing up GPn numbers with physical pin numbers. It's easily done! It looks to me as if T_CS may not be working so it isn't being selected. Also, make sure that T_DIN is linked to MOSI, T_DO to MISO and T_CLK to the SPI clock. The display itself doesn't use SPI, only the touch and SD card. This makes me think you have a SPI connection or configuration problem. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| LouisG Senior Member Joined: 19/03/2016 Location: AustraliaPosts: 124 |
Thanks Mick. You are right. Having both pin numbers and GP numbers side by side can easily confuse (and it did!). However, your words on the SPI connections jolted my mind. I need first to configure SPI! Silly me. Will do it. Louis - |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
I've stopped using physical pin numbers now. They are quicker to type, but don't transfer over to other RP2040 boards. There's only CONST that I can think of that insists on physical pin numbers, and there's a way round that. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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