drivers/shield_w5100: add module for the W5100 Ethernet Shield

This module provides no more than the correct configuration parameters
for the `w5100` driver using the Arduino I/O mapping features. But
by doing so, it will work out of the box with every mechanically and
electrically compatible board for which the Arduino I/O mapping
features are implemented.

drivers/Makefile.dep

@@ -180,6 +180,14 @@ ifneq (,$(filter servo_%,$(USEMODULE)))
   USEMODULE += servo
 endif
 
+ifneq (,$(filter shield_w5100,$(USEMODULE)))
+  FEATURES_REQUIRED += arduino_pins
+  FEATURES_REQUIRED += arduino_shield_isp
+  FEATURES_REQUIRED += arduino_shield_uno
+  FEATURES_REQUIRED += arduino_spi
+  USEMODULE += w5100
+endif
+
 ifneq (,$(filter sht1%,$(USEMODULE)))
   USEMODULE += sht1x
 endif

drivers/doc.txt

@@ -121,4 +121,32 @@
  * @ingroup     config
  * @brief       Compile time configurations for different kinds of
  *              devices that do not match any other category
- */
+ */
+
+/**
+ * @defgroup    drivers_shield  Shields - hardware extension daughter board drivers
+ * @ingroup     driver
+ * @brief       Provides drivers for hardware extension daughter boards such as
+ *              Arduino Shields
+ */
+
+/**
+ * @defgroup    drivers_shield_w5100    W5100 Ethernet Shield driver
+ * @ingroup     driver_shield
+ * @brief       Driver for the Arduino W5100 Ethernet Shield
+ *
+ * Usage
+ * =====
+ *
+ * The driver is enabled by using the module `shield_w5100`, e.g. with:
+ *
+ * ```
+ * USEMODULE=shield_w5100 make BOARD=arduino-due -C examples/gnrc_networking
+ * ```
+ *
+ * It depends on @ref drivers_w5100 and provides nothing more than the providing
+ * the correct configuration. For this, it depends on the `arduino_pins`,
+ * `arduino_spi`, `arduino_shield_uno` and the `arduino_shield_isp` feature.
+ * It should work out of the box for any fully Arduino UNO compatible board
+ * (including the ISP header) and correct I/O mapping (`arduino_*`) features.
+ */

drivers/w5100/include/w5100_params.h

@@ -25,6 +25,12 @@
 extern "C" {
 #endif
 
+#ifdef MODULE_SHIELD_W5100
+#define W5100_PARAM_SPI         ARDUINO_SPI_ISP
+#define W5100_PARAM_CS          ARDUINO_PIN_10
+#define W5100_PARAM_EVT         ARDUINO_PIN_2
+#endif
+
 /**
  * @name    Default configuration parameters for the W5100 driver
  * @{

makefiles/pseudomodules.inc.mk

@@ -494,6 +494,7 @@ PSEUDOMODULES += shell_commands
 ## @}
 PSEUDOMODULES += shell_hooks
 PSEUDOMODULES += shell_lock_auto_locking
+PSEUDOMODULES += shield_w5100
 PSEUDOMODULES += slipdev_stdio
 PSEUDOMODULES += slipdev_l2addr
 PSEUDOMODULES += sock