sam4e8e: Add the SAM4e8e port

This can be flashed to e.g. the duet wifi using bossac. It requires a
later version as is currently included in the klipper repo (1.8
vs. 1.2). Comms are currently via UART0 only, USB serial is still TBD

Signed-off-by: Florian Heilmann <Florian.Heilmann@gmx.net>

src/sam4e8e/Kconfig

@@ -0,0 +1,30 @@
+# Kconfig settings for SAM4e8e processors
+
+if MACH_SAM4E8E
+
+config SAM_SELECT
+    bool
+    default y
+    select HAVE_GPIO
+#    select HAVE_GPIO_I2C
+    select HAVE_GPIO_ADC
+    select HAVE_GPIO_SPI
+    select HAVE_USER_INTERFACE
+
+config BOARD_DIRECTORY
+    string
+    default "sam4e8e"
+
+config CLOCK_FREQ
+    int
+    default 60000000 # 120000000/2
+
+config SERIAL
+    bool
+    default y
+config SERIAL_BAUD
+    depends on SERIAL
+    int "Baud rate for serial port"
+    default 250000
+
+endif