Support a third serial port (#21784)

2021-05-07 17:31:45 +12:00
parent be6fbc76a1
commit 02405add76
20 changed files with 212 additions and 47 deletions
--- a/Marlin/src/HAL/AVR/HAL.h
+++ b/Marlin/src/HAL/AVR/HAL.h
@@ -103,6 +103,13 @@ typedef int8_t pin_t;
    #endif
    #define MYSERIAL2 customizedSerial2
  #endif
+
+  #ifdef SERIAL_PORT_3
+    #if !WITHIN(SERIAL_PORT_3, -1, 3)
+      #error "SERIAL_PORT_3 must be from 0 to 3, or -1 for USB Serial."
+    #endif
+    #define MYSERIAL3 customizedSerial3
+  #endif
 #endif

 #ifdef MMU2_SERIAL_PORT