Patrick Fallberg
f5ef712308
The W5100 module has a SPI_EN signal that enables or disables the SPI bus. A bug in the module causes MISO to be continously driven by the module when SPI_EN is pulled high. This is described in this application note: https://www.google.se/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCAQFjAA&url=http%3A%2F%2Fwww.wiznet.co.kr%2FUpLoad_Files%2FReferenceFiles%2FW5100_AN_SPI.pdf&ei=ij84VK7uM6nNygPqvICYDw&usg=AFQjCNGz1qttBEwG1azc1Eza4j69v1rpDQ&sig2=UUUtb4Dr0F35g8ByHMsyig&bvm=bv.77161500,d.bGQ This commit changes the Ethernet gateway sketch to drive SPI_EN high or low, depending on which module is in use (SPI bus is shared between Ethernet and RF modules). The pin attached to SPI_EN is defined by W5100_SPI_EN. This define can be commented out if SPI_EN is not needed (different module) or if the module manages SPI_EN in hardware (some W5100 shields does this).
For information on installing libraries, see: http://arduino.cc/en/Guide/Libraries