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Forum Index : Microcontroller and PC projects : touch buttons
| Author | Message | ||||
palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1989 |
I am upgrading a project to use a 2.8" TFT display. I have the display working OK and have set up the display the way I want. Previously I had 3 switches connected to interrupt pins. I now have 3 touch buttons on the screen, how do I monitor the buttons. I looked through Peter's demo code but couldn't find anything. I know Geoff used the Touch(x) command but his small demo code ran so fast the touch could not be missed. With a large program it would almost certainly be doing something else during the touch. Paul "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| viscomjim Guru Joined: 08/01/2014 Location: United StatesPosts: 925 |
Palcal, I recall seeing a post i believe it was from Zonker where he had a gauge set up on the lcd and it had a couple of buttons, that when you touched them they turned a different color. I can't find the thread now but may look around, I thought is was pretty cool and might help you. |
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CircuitGizmos Guru Joined: 08/09/2011 Location: United StatesPosts: 1427 |
Make a timed interrupt (Settick) and call touch. If x and y are -1 there has been no touch. SETTICK 100, TouchInt, 1 TouchInt: ' Read touch tX = TOUCH(X) tY = TOUCH(Y) ' Test for valid touch IF tX <> -1 AND tY <> -1 THEN IF 8 < tX AND tX < 55 AND 56 < tY AND tY < 102 THEN keypress = 1 ELSE IF 8 < tX AND tX < 55 AND 120 < tY AND tY < 165 THEN keypress = 2 ELSE IF 8 < tX AND tX < 55 AND 185 < tY AND tY < 230 THEN keypress = 3 ELSE IF 71 < tX AND tX < 119 AND 56 < tY AND tY < 102 THEN keypress = 4 ELSE IF 71 < tX AND tX < 119 AND 120 < tY AND tY < 165 THEN keypress = 5 ELSE IF 71 < tX AND tX < 119 AND 185 < tY AND tY < 230 THEN keypress = 6 ELSE IF 135 < tX AND tX < 182 AND 56 < tY AND tY < 102 THEN keypress = 7 ELSE IF 135< tX AND tX < 182 AND 120 < tY AND tY < 165 THEN keypress = 8 ELSE IF 135 < tX AND tX < 182 AND 185 < tY AND tY < 230 THEN keypress = 9 ELSE IF 200 < tX AND tX < 245 AND 56 < tY AND tY < 102 THEN keypress = 10 ELSE IF 200 < tX AND tX < 245 AND 120 < tY AND tY < 165 THEN keypress = 11 ELSE IF 200 < tX AND tX < 245 AND 185 < tY AND tY < 230 THEN keypress = 12 ELSE IF 265 < tX AND tX < 308 AND 56 < tY AND tY < 102 THEN keypress = 13 ELSE IF 265 < tX AND tX < 308 AND 120 < tY AND tY < 165 THEN keypress = 14 ELSE IF 265 < tX AND tX < 308 AND 185 < tY AND tY < 230 THEN keypress = 15 ELSE keypress = 99 ENDIF PRINT "key: " keypress ' Turn off TouchInt SETTICK 0, 0, 1 ENDIF IRETURN From that bit of code the screen is divided into 15 parts/buttons. A touch sets keypress to a key value for the main program to deal with. Micromites and Maximites! - Beginning Maximite |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1989 |
Thanks, I understand that, will give it a go I would also like to thank Geoff and especially Peter for his work on the TFT displays they make a project very professional. When I built my Maximite some years back I never thought it would come to this and with the 470 maybe on the horizon who knows? Thanks to all. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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Zonker Guru Joined: 18/08/2012 Location: United StatesPosts: 767 |
Evening Gent's... Just got back to the house... 2015-06-30_021427_2-4_inch_volt_meter_demo.zip The way I did it, was to keep the button sensing in the main "DO" loop going as fast as it can. When a touch is detected, you must loop waiting for the "no finger" response... That's where I turn the button a different color... Anyway, I guess there are several ways to get the job done... The demo was just to show the display doing something useful... 
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1989 |
Thanks Zonker, I went with Gizmo's code and it works well. Thanks all Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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