init commit of examples

Examples/SPISLAVEDMA/SPISLAVEDMA(3)/documentation/spi_slave_dma.rst

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+SPI Slave DMA
+=============
+In this application example SPI master transfer "Hello World!" message using DMA
+channel 0 to slave. SPI Slave will receive data using DMA channel 3 and store in
+the rx_buffer. SPI slave will send again received message back to master using
+DMA channel 2. SPI master will receive message using DMA channel 1
+
+Supported evaluation kit
+------------------------
+- `ATSAME54-XPRO <http://www.microchip.com/Developmenttools/ProductDetails.aspx?PartNO=ATSAME54-XPRO>`_
+
+Drivers and Middleware
+----------------------
+* DMA SPI MASTER
+* Synchronous SPI Slave
+* DMA
+* STDIO Redirect
+
+Interface settings
+------------------
+- USART
+	- No parity
+	- 8-bit character size
+	- 1 stop bit
+	- 9600 baud-rate
+
+- SPI MASTER
+	- Mode 0
+	- 8-bit character size
+	- MSB First
+	- 1000000 baud-rate
+
+- SPI Slave
+	- Mode 0
+	- 8-bit character size
+	- MSB First
+
+- DMA
+	- DMA Channel 0 - SPI Master TX
+	- DMA Channel 1 - SPI Master RX
+	- DMA Channel 2 - SPI Slave TX
+	- DMA Channel 3 - SPI Slave RX
+
+Hardware Connection
+-------------------
+    =======================  ======================
+      SPI Master(SERCOM4)       SPI Slave(SERCOM6)
+    =======================  ======================
+    PB27 **(MOSI)**             PC04 **(MOSI)**
+    PB26 **(SCK)**              PC05 **(SCK)**
+    PB29 **(MISO)**             PC07 **(MISO)**
+    PB28 **(CS)**               PC06 **(CS)**
+    =======================  ======================
+
+Running the demo
+----------------
+#. Press Download Pack and save the .atzip file
+#. Import .atzip file into Atmel Studio 7, File->Import->Atmel Start Project.
+#. Build and flash into supported evaluation board
+#. Open the serial port in Atmel Data Visualizer or any serial port monitor.
+#. Press the Reset button.
+#. You should see the **Hello World!** message on console received by SPI slave and SPI master

Examples/SPISLAVEDMA/SPISLAVEDMA(3)/documentation/stdio.rst

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+STDIO redirection
+=================
+
+The STDIO redirection provides means to redirect standard input/output to HAL
+IO.
+
+On initialization, the HAL IO descriptor is assigned so that all input and
+output is redirected to access it. The IO descriptor can also be changed
+through stdio_io_set_io(). All stdin or stdout access is redirected to the
+IO descriptor. When the IO descriptor is set to NULL, all input and output 
+are discarded.
+
+For GCC redirection, the stdout and stdin buffer are turned off, the
+standard _read() and _write() are overridden.
+
+For IAR redirection, the __read() and __write() are overridden.
+
+For Keil redirection, the Retarget.c are modified to override fputc(), fgetc(),
+etc.
+
+Features
+--------
+
+* Standard input/output redirection (e.g., printf to EDBG COM port)
+
+Dependencies
+------------
+
+* HAL IO driver
+
+Limitations
+-----------
+
+* IO read/write operation should be synchronous