Allow use to choose a different SPI port and also ability to use my F…

[KurtE]

…lexSPI code

Added the ability to specify a different SPI port on the begin method. like

ts.begin(&SPI1);

And use SPI1 for the touch screen.

Also for T4.x as an experiment I added support to allow you to include my FlexIO library including the FlexSPI object : My library is up at: https://github.com/KurtE/FlexIO_t4

I experimented with my version of Touchpaint_xpt2046;, with using different pins for the touch SPI pins than the display.. On T4.1 I tried using SPI1, with pins that would work for either SPI1 or FlexIO.

For FlexIO I could do:

#define Touch_SCK    27  // B0_10
#define Touch_CS     38  // B1_01
#define Touch_MOSI  26  // B1_00
#define Touch_MISO  39  // B0_11S
FlexIOSPI SPIFLEX(Touch_MOSI, Touch_MISO, Touch_SCK, -1); // Setup on (int mosiPin, int sckPin, int misoPin, int csPin=-1) :
XPT2046_Touchscreen ts(Touch_CS);

And later I would do:

ts.begin(&SPIFLEX);

Or since these are actually SPI1 bpins. could use the defines like before:

#define Touch_SCK    27  // B0_10
#define Touch_CS     38  // B1_01
#define Touch_MOSI  26  // B1_00
#define Touch_MISO  39  // B0_11S
XPT2046_Touchscreen ts(Touch_CS);

And then in setup do:

  SPI1.setMISO(Touch_MISO);
  if (!ts.begin(&SPI1)) {

Which appeared to work.

I tried adding the use of my flexIO library with the syntax like:

#if defined(__IMXRT1062__)
#if __has_include(<FlexIOSPI.h>)
    #include <FlexIOSPI.h>
#endif
#endif
'''
So hopefully should not impact non T4 boards nor ones that don't have my libraries.

[KurtE]

Note: I believe this would address issue #29

[PaulStoffregen]

Can you change the API so it take C++ reference. Like this:

ts.begin(SPI1);

Perfectly fine to use pointers inside the library. Let's just avoid the extra C syntax for the public API.

[KurtE]

Will do.

From: Paul Stoffregen notifications@github.com Sent: Monday, October 05, 2020 4:22 PM To: PaulStoffregen/XPT2046_Touchscreen XPT2046_Touchscreen@noreply.github.com Cc: KurtE kurte@rockisland.com; Author author@noreply.github.com Subject: Re: [PaulStoffregen/XPT2046_Touchscreen] Allow use to choose a different SPI port and also ability to use my F… (#33)

Can you change the API so it take C++ reference. Like this:

ts.begin(SPI1);

Perfectly fine to use pointers inside the library. Let's just avoid the extra C syntax for the public API.

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[PaulStoffregen]

Looks great. Thanks!