* Fix compiler warning [-Wunused-const-variable=]
Compiling a sketches that uses this library can report a warning
about the const variable `font` being defined, but never used.
Work around this by defining a (static inline) function which
references the variable.
* Remove unused variable (compiler warning)
The Teensy T4 (__IMXRT1062__) port registers need to be 32 bits unlike the Teensy 3.x which are 8 bits.
adafruit_ili9341 and adafruit_st7735 libraries graphic test
Removed compiler warning
that PROGMEM was previously defined. So undefine it first...
Note: Thought of simply doing nothing here
(do neither the #undef nor the #define).
But that gives compiler error
Teensy T4 - Make Bit Bang version work.
With T4, the Port/Set registers are masks not single value.
So need to setup those class variables:
Also found that bitbang of T4, was too fast for display, so put in same slow
down that ESP32 has, which gets the clock down to mayby 12.5mhz
Tried these changes out with both:
adafruit_ili9341 and adafruit_st7735 libraries graphic test
Update comments
‘Wrong’ behavior is default, so old code will continue to work. New
code can call cp437() after initializing the display to use correct
symbol numbers for upper ASCII characters.
