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Forum Index : Microcontroller and PC projects : Use of PicoMite pins
| Author | Message | ||||
| foxleyboy Newbie  Joined: 09/06/2019 Location: United KingdomPosts: 14 |
I am useing Waveshare Pic-Res Touch-LCD-2.8 display. It's all working fine. To set this up I have used GP10, GP11 and GP12 for the system SPI. Plus pins GP8, GP15, GP9 and GP13 to set the LCD options. I have not set up the touch features for which I see I need to use pins GP16 and GP17. I guess I need to set the System option and the LCD option to get the display to work at all. My question is, if I do not set the Touch option can I use GP16 and GP17 as normal digital i/o pins? Roy |
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| JohnS Guru  Joined: 18/11/2011 Location: United KingdomPosts: 3649 |
I expect so - but try it :) John |
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| Bowden_P Senior Member  Joined: 20/03/2019 Location: United KingdomPosts: 162 |
Hi Roy, I suspect that even if you tie GP16 high to disable the touch interface, it may still output interrupts on GP17 if touched. So unless you physically cut this signal off at the screen I reckon you will get interference from GP17. With best regards, Paul. Nothing so constant as change. |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5704 |
As the PicoMite is physically mounted onto this display I don't think you have a choice. You can *hope* that Touch has to be initialised in software before it drives the pins, but the signal lines are, to all intents and purposes, permanently connected. I wouldn't recommend attempting to use them for anything else unless you are willing to modify either the PicoMite or the display to cut those signals. You could try monitoring them with a 'scope to see what state they are in by default and what happens if the screen is touched. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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