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Forum Index : Microcontroller and PC projects : Setting up Pimoroni Explorer Base for the Pico
| Author | Message | ||||
| HLinder Newbie  Joined: 17/08/2023 Location: GermanyPosts: 3 |
Dear all, apologies if I have missed this topic in my forum search. I try to get the Pimoroni Base Explorer on-board LCD to work with the current picomite firmware. The board is working under MicroPython so hardware seems ok. However OPTION settings in MMBasic led to no success so far. Did already someone get this to work? Any help would be wonderful. Thanks Helmut |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
No idea what that display is, and the schematic doesn't tell us either. Do you have any details on it? Model number or anything? Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 713 |
I also had a problem with that . If I remember correctly , uPython uses different pins ? In some cases uPython is much more accessible than MMBasic . my site |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Right, I've looked closer. The only connected signals are MOSI, SCLK, CS and DC. There is no RESET connection so I don't think MMBasic can initialise this display at all. If you can find a RST or RESET pin on the display it may be possible to wire it to another pin and do something with it. Welcome to the forum, Helmut. :) Edited 2023-08-19 01:42 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
Try tie reset high. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
AFAIK the display RESET signal has to be toggled to initialise it under MMBasic. Edited 2023-08-19 02:38 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| HLinder Newbie Joined: 17/08/2023 Location: GermanyPosts: 3 |
Wow what a fast response. Thank you so much for the support. It nags on me since days. My final attempt was a trial and error approach and that gave success. These are the settings which did the trick so far. OPTION SYSTEM SPI GP18,GP19,GP20 OPTION LCDPANEL ST7789, LANDSCAPE,GP16,GP12,GP17 GP20 is a dummy pin with regards to SPI. Should I close the topic and how is that done? Thanks Helmut |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
There isn't really a way to close a topic. They just sort of degenerate into nothingness. :) I thought it might be a ST7789, but the schematic connections look strange. I have one of those, but without CS brought out so I had to modify it as it definitely won't work without that signal. I see the display has a RESET pin but it's hard-wired to a power-on reset circuit. That's why it's working. :) Yes, MMBasic needs you to specify a pin whether you need it or not. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Derek_H Newbie Joined: 26/07/2023 Location: United KingdomPosts: 10 |
Possible already solved/too late but here are my settings for the Pimoroni Pico Explorer Base. > option list WebMite MMBasic Version 5.07.07 OPTION SYSTEM SPI GP18,GP19,GP0 OPTION LCDPANEL ST7789, PORTRAIT,GP16,GP26,GP17,GP20 Derek |
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| HLinder Newbie Joined: 17/08/2023 Location: GermanyPosts: 3 |
Ultimate proof that SPI only needs 3 wires i.e. those pins our settings have in common  btw. backlight dimming appears to be non-functional on the board. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Depends on what you want to do. All the pins are there for a reason. :) You can't have more than one device on the bus without a CS for each. You can't read data from a device without MISO. You can't re-initialise a device without powering down without RESET. The backlight LED has a fixed current drive from its own chip. You can't vary the brightness without some serious PCB hackery.. Edited 2023-08-24 00:39 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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