add 'togglePin' convenience function (#8734)

* add 'togglePin' conveniance function

for AVR and chibios

* drop outmost parantheses

Co-Authored-By: Konstantin Đorđević <[email protected]>

* toggle pin on avrs

toggle a pin configured as output by writing the corresponding bit to the PIN register

Co-Authored-By: Takeshi ISHII <[email protected]>

* togglepin: add documentation for newly added function

* Update docs/internals_gpio_control.md

Co-Authored-By: Konstantin Đorđević <[email protected]>

* on AVR: use PORTD to toggle the output

... since not all MCUs support toggling through writing to PIN

Co-Authored-By: Ryan <[email protected]>

Co-authored-by: Johannes <[email protected]>
Co-authored-by: Konstantin Đorđević <[email protected]>
Co-authored-by: Takeshi ISHII <[email protected]>
Co-authored-by: Ryan <[email protected]>

quantum/quantum.h

@@ -197,6 +197,8 @@ typedef uint8_t pin_t;
 
 #    define readPin(pin) ((bool)(PINx_ADDRESS(pin) & _BV((pin)&0xF)))
 
+#    define togglePin(pin)  (PORTx_ADDRESS(pin) ^= _BV((pin)&0xF))
+
 #elif defined(PROTOCOL_CHIBIOS)
 typedef ioline_t pin_t;
 
@@ -210,6 +212,8 @@ typedef ioline_t pin_t;
 #    define writePin(pin, level) ((level) ? writePinHigh(pin) : writePinLow(pin))
 
 #    define readPin(pin) palReadLine(pin)
+
+#    define togglePin(pin) palToggleLine(pin)
 #endif
 
 #define SEND_STRING(string) send_string_P(PSTR(string))