Massdrop keyboard support (#3780)

* Massdrop SAMD51

Massdrop SAMD51 keyboards initial project upload

* Removing relocated files

Removing files that were relocated and not deleted from previous location

* LED queue fix and cleaning

Cleaned some white space or comments.
Fix for LED I2C command queue.
Cleaned up interrupts.
Added debug function for printing numbers to scope through m15 line.

* Factory programmed serial usage

Ability to use factory programmed serial in hub and keyboard usb descriptors

* USB serial number and bugfix

Added support for factory programmed serial and usage.
Incorporated bootloader's conditional compiling to align project closer.
Fixed issue when USB device attempted to send before enabled.
General white space and comment cleanup.

* Project cleanup

Cleaned up project in terms of white space, commented code, and unecessary files.
NKRO keyboard is now using correct setreport although KBD was fine to use.
Fixed broken linkage to __xprintf for serial debug statements.

* Fix for extra keys

Fixed possible USB hang on extra keys report set missing

* I2C cleanup

I2C cleanup and file renames necessary for master branch merge

* Boot tracing and clocks cleanup

Added optional boot debug trace mode through debug LED codes.
General clock code cleanup.

* Relocate ARM/Atmel headers

Moved ARM/Atmel header folder from drivers to lib and made necessary makefile changes.

* Pull request changes

Pull request changes

* Keymap and compile flag fix

Keymap fix for momentary layer.
Potential compile flag fix for Travis CI failure.

* va_list include fix

Fix for va_list compile failure

* Include file case fixes

Fixes for include files with incorrect case

* ctrl and alt67 keyboard readme

Added ctrl and alt67 keyboard readme files

1 files changed, 29 insertions, 1 deletions

diff --git a/tmk_core/common/print.h b/tmk_core/common/print.h
index 8836c0fc7..9cbe67bad 100644
--- a/tmk_core/common/print.h
+++ b/tmk_core/common/print.h
@@ -99,6 +99,34 @@ void print_set_sendchar(int8_t (*print_sendchar_func)(uint8_t));
 
 #  endif /* USER_PRINT / NORMAL PRINT */
 
+#elif defined(PROTOCOL_ARM_ATSAM) /* PROTOCOL_ARM_ATSAM */
+
+#  include "arm_atsam/printf.h"
+
+#  ifdef USER_PRINT /* USER_PRINT */
+
+// Remove normal print defines
+#    define print(s)
+#    define println(s)
+#    define xprintf(fmt, ...)
+
+// Create user print defines
+#    define uprintf(fmt, ...)  __xprintf(fmt, ##__VA_ARGS__)
+#    define uprint(s)          xprintf(s)
+#    define uprintln(s)        xprintf(s "\r\n")
+
+#  else /* NORMAL PRINT */
+
+// Create user & normal print defines
+#    define xprintf(fmt, ...)  __xprintf(fmt, ##__VA_ARGS__)
+#    define print(s)           xprintf(s)
+#    define println(s)         xprintf(s "\r\n")
+#    define uprint(s)          print(s)
+#    define uprintln(s)        println(s)
+#    define uprintf(fmt, ...)  xprintf(fmt, ...)
+
+#  endif /* USER_PRINT / NORMAL PRINT */
+
 #elif defined(__arm__) /* __arm__ */
 
 #  include "mbed/xprintf.h"
@@ -130,7 +158,7 @@ void print_set_sendchar(int8_t (*print_sendchar_func)(uint8_t));
 /* TODO: to select output destinations: UART/USBSerial */
 #  define print_set_sendchar(func)
 
-#endif /* __AVR__ / PROTOCOL_CHIBIOS / __arm__ */
+#endif /* __AVR__ / PROTOCOL_CHIBIOS / PROTOCOL_ARM_ATSAM / __arm__ */
 
 // User print disables the normal print messages in the body of QMK/TMK code and
 // is meant as a lightweight alternative to NOPRINT. Use it when you only want to do