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Package enc28j60 Based on the enc28j60.c file by Guido Socher. Original file can be found at https://github.com/muanis/arduino-projects under libraries/etherShield/* This device communicates with its host through SPI by means of a CS (active low) with a clock speed of up to 20 MHz. The IC takes care of several things, mainly at the Data Link layer (layer 2) such as the first 8 bytes of the ethernet packet containing the preamble and start-of-frame, these are generated for outgoing buffer and removed from the incoming buffer (section 5.1.1). It also implements CRC sum and can verify incoming packets and reject faulty ones. It can also generate them for outgoing packets. The Host (microcontroller) is responsible for writing the desired destination address into the transmit buffer (5.1.2). Users of the ENC must generate a MAC address to populate the source address field. The first three bytes are the OUI and are distributed by IEEE. The Host is responsible for writing the source address too (5.1.3). The type field specifies the protocol (ARP | IP) or may be treated as an application specific field for proprietary networks (5.1.4). The data field is variable length (0 to 1500 bytes). Larger packets may be dropped by nodes (5.1.5). The padding field is used for small payloads to meet IEEE requirements. An Ethernet packet must be no smaller than 60 bytes (64 counting the CRC sum). The host must generate padding as the IC will not add padding to the packet before transmitting. (5.1.6) The IC will check CRC of incoming packets. Packets with invalid CRC will automatically be discarded if ERXFCON.CRCEN is set. Host can also determine if recieved packets are valid by reading the recieve status vector (see section 7.2). CRC sum field generation by IC is set by default and so should not have to be filled in by Host (5.1.7) The following sections will detail Layer 2 and layer 3 protocol frames which are implmented in this code. Diagram: the enc28j60 takes care of the preamble and the SFD. It is by default configured to take care of the FCS too. Address resolution protocol. See https://www.youtube.com/watch?v=aamG4-tH_m8 Legend: Diagram:
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purl: pkg:golang/github.com/soypat/enc28j60
License: BSD-3-Clause
Latest release: over 4 years ago
First release: over 4 years ago
Namespace: github.com/soypat
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