Touchscreen troubles

[endian-albin]

I've been working hard to enable interrupt-driven touch events but without success. This is what I've discovered:

• With LittlevGL (the currently used graphic library), any touch event crashes the application
• It works with the Adafruit GFX library, but then the RTT console and logging must be disabled (otherwise the program crashes immediately) and it requires a switch to C++ and dependency on Arduino library functions.

So, how should we proceed?

• Live without logging, introduce bloat and switch to Adafruit GFX?
• Drop touch and focus on other things, but then how should user interaction take place? We've got the button, but how far does that take us?
• Fix the crashes, rewrite the driver or do other hard work?

[endian-albin]

I've now pushed an experimental "tap to crash" branch (enable-touchscreen). Sometimes the debug log prints the following message before freezing the application:

assertion "p_cb->state != NRFX_DRV_STATE_UNINITIALIZED" failed: file "WEST_TOPDIR/modules/hal/nordic/nrfx/drivers/src/nrfx_spi.c", line 347, function: nrfx_spi_xfer

[endian-albin]

I just looked inside cst816s_trigger.c and discovered the CONFIG_CST816S_TRIGGER_GLOBAL_THREAD. Using this instead of OWN_THREAD made it work!