AVR GPIO macro defines more readable (#5937)

* A little easier to read the definition of the GPIO control macro for AVR.

No change in build result.

* Changed to not use GNU statement expression extension.

No change in build result.

* Modified split_common/serial.c to use qmk_firmware standard GPIO control macro.

No change in build result.

* fix PE6 -> E6

* remove some space

* add some comment to config_common.h

* Changed split_common/serial.c to use a newer version of qmk_firmware standard GPIO control macro.

1 files changed, 10 insertions, 0 deletions

diff --git a/quantum/config_common.h b/quantum/config_common.h
index bc4d9ec1a..ae72701da 100644
--- a/quantum/config_common.h
+++ b/quantum/config_common.h
@@ -132,6 +132,16 @@
         #define F7 PINDEF(F, 7)
     #endif
 
+  #ifndef __ASSEMBLER__
+    #define _PIN_ADDRESS(p, offset) _SFR_IO8(ADDRESS_BASE + (p >> PORT_SHIFTER) + offset)
+    // Port X Input Pins Address
+    #define PINx_ADDRESS(p)  _PIN_ADDRESS(p, 0)
+    // Port X Data Direction Register,  0:input 1:output
+    #define DDRx_ADDRESS(p)  _PIN_ADDRESS(p, 1)
+    // Port X Data Register
+    #define PORTx_ADDRESS(p) _PIN_ADDRESS(p, 2)
+  #endif
+
 #elif defined(PROTOCOL_CHIBIOS)
   // Defines mapping for Proton C replacement
   #ifdef CONVERT_TO_PROTON_C