Renew lgtx8p.h and lgtx8e.h with Arduino style register definitions.

[LaZsolt]

(*((volatile unsigned char *) address )) replaced to _SFR_MEM8( address ) or _SFR_IO8( address )
and replacement of the missing 16 bit registers definitions: _SFR_MEM16( address ) or _SFR_IO16( address )
according to #57 (comment)

[dbuezas]

Fantastic!
Please confirm you tested it by running code that uses some registers and I'll merge asap

[LaZsolt]

Not tested yet, but I read back every modification many times carefully. I ask others to help testing this two files.

[dbuezas]

Marked as draft, you can mark it as "not draft" when you've smoke tested it and want me to merge.
This looks so much better than before! 💯

[dbuezas]

By the way, related to register definitions, I use vscode and it is nice to get datasheet bits when you hover a register.
What do you think about this ?

[LaZsolt]

@dbuezas
I think it is a lot of work to copy all resisters bits explanations from the databook to this file. But at the end it will be look nice.

[LaZsolt]

Anyway, I have only one big project, based on LGT, which not using LGT's extra registers of related to timers. So I could test if the new files are free of compiler errors.

[dbuezas]

That should be enough for now, worse case scenario some are not fully functional, which was already the case before.

[LaZsolt]

Tested with this program:

/* Timer3 overflow interrupt example for LGT8F328P microcontroller */

// LED_BUILTIN = D13

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);

// initialize Timer3
  noInterrupts();             // disable all interrupts
  TCCR3A = 0;
  TCCR3B = 0;
  TCCR3C = 0;
  TCCR3D = 0;

  TCNT3 = 49911;              // preload timer 65536-16MHz/1024/2Hz
  TCCR3B |= (1 << CS32) | (1 << CS30); // 1024 prescaler
  TIMSK3 |= (1 << TOIE3);     // enable timer overflow interrupt
  interrupts();               // enable all interrupts
}

ISR(TIMER3_vect) // interrupt service routine that wraps a user defined function supplied by attachInterrupt
{
  if (TIFR3 & (1 << TOIE3)) { // Examine which event happened
     TIFR3 = (1 << TOIE3);    // Clear Timer3 interrupt flag register by setting appropriate bit.
     TCNT3 = 49911;           // preload timer
     fastioToggle(D13);       // LED on D12 pin when using red Wemos XI TTGO board
  }
}

void loop() {
// nothing
}

[dbuezas]

Fantastic work @LaZsolt !
Merging now