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The IoT, which is used by connecting to a network, has been spreading to embedded devices as well. While WiFi network connections are common for home appliances such as televisions and other consumer products such as smartphones, Ethernet, a wired communication method, is used for products for industrial equipment that require operational stability and security.
In this article, I will explain how to support Ethernet IoT by applying the external Ethernet-enabled LAN controller W5500 to a general-purpose MCU(Nucleo-F103RB) that you have been familiar with. The target is the STM32, but it is an easy way to support any model by customizing the interface (SPI communication) between the MCU and the LAN controller.
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