Projet BTS SNIR 2ème année Gateway between a weather MicroStation using LoRa modulation and a web server. This depo is segmented in different programs for arduino using ATMEGA328P and SAMD21.
Because we're using two arduino shields using SPI communication, we need to select a chip select for each shield. I decided to use D11 for the Ethernet shield (10 for the LoRa, 4 for the SD).
To do this, edit w5100.h in the default ethernet librairy in the installation folder of your arduino IDE (on windows, in administrator mode C:\Program Files (x86)\Arduino\libraries\Ethernet\src\utility\w5100.h)
On this case, you need to change this line #define ETHERNET_SHIELD_SPI_CS 10 to #define ETHERNET_SHIELD_SPI_CS 11