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Forum Index : Microcontroller and PC projects : GUI calibrate question
| Author | Message | ||||
| ville56 Newbie  Joined: 08/06/2022 Location: AustriaPosts: 23 |
Hi, i'm fighting with the touch calibration of a waveshare Pico-ResTouch-LCD-3.5 display. As the gui calibrate command gives an error-loop most the time, even when just briefly pecking at the display, at last i managed to get a complete run though. The result was in error, but the next attempts seem to run smooth, no hastly pecking needed. By playing around i found out that the gui calibrate command takes some arguments, appearently the same as one sees in option list for the touch calibration. I there any descrition of the arguments, what do they represent? Searching throu the manual and the forum reveals a lot of topics/issues with gui calibrate but no answer to my question. many thanks in advance, Gerald |
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TassyJim Guru  Joined: 07/08/2011 Location: AustraliaPosts: 4907 |
That seems to be missing from the manual. You are correct, the arguments after GUI CALIBRATE seen in OPTION LIST are significant. After calibrating the LCD display, you can copy the GUI CALIBRATE 0, 262, 327, 929, 702 or similar line from the OPTION LIST and use it next time you have to reload the OPTIONs. Those values are used to save you having to re-calibrate. I put my calibrate in my list of options save for when I re-configure my system. It has to go after OPTION TOUCH Jim VK7JH MMedit MMBasic Help |
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| ville56 Newbie Joined: 08/06/2022 Location: AustriaPosts: 23 |
Thanks Jim, what you suggest was exactly my plan. Keeping the values in my options documentation and copy them after re-init of the picomite to avoid the troubles with the infinite error loop. I just wanted to understand what the values are, if they are specific for a certain display specimen and if they can be used as a starting point for other specimen of the same breed of display. Fine adjustment then with a second calibrate run to avoid that troublesome error-loop. thanks again, Gerald |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 4907 |
The values are: ignore, x zero, y zero, x slope, y slope. X and y depend on orientation and then they are simple linear equations. I think I have the order of arguments correct. Jim VK7JH MMedit MMBasic Help |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 678 |
", if they are specific for a certain display specimen and if they can be used as a starting point for other specimen of the same breed of display. Fine adjustment then with a second calibrate run to avoid that troublesome error-loop." The exact values are specific to each display, but as you guessed they are the best way for first configuration of a new display of the same type, with a follow up GUI CALIBRATE to get it exact. |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 366 |
If I have a program that uses ili9341 touch and I have it calibrated for the display then what would other uses of my code have to do to get touch to work like it did on my display please? |
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| ville56 Newbie Joined: 08/06/2022 Location: AustriaPosts: 23 |
Just for clarification, my question was based on the fact that, at least for my ILI9844W display, there is an issue with GUI CALIBRATE (endless error loop). This makes it real hard to calibrate the touch part of the display after e.g. loading a new firmware or a OPTION RESET. So the fact that GUI CALIBRATE takes parameters which are not documented but seem to be the same as you can see in the OPTION LIST command, makes reestablishing the calibration easy once you successfully made it. You just note the values and can enter them manually if needed. And yes, i wanted to make sure for me, this is a reasonable way to do that. |
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| phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 678 |
@stanleyella Calibration must be done before you run a program that requires touch. The calibration values are only valid for other displays of the same type, size, version and orientation configuration. You could include your LCD configuration and calibration values in the documentation that goes with the program, but not in the program. In a terminal enter something like this:- OPTION SYSTEM SPI GP18,GP19,GP16 OPTION LCDPANEL ILI9341, LANDSCAPE,GP15,GP14,GP13 OPTION TOUCH GP12,GP11 GUI CALIBRATE 0, 146, 218, 881, 633 . Edited 2022-09-22 08:46 by phil99 |
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