User manual

466
mikoC PRO for PIC32
MikroElektronika
SPI Ethernet ENC24J600 Library
The ENC24J600 is a stand-alone Ethernet controller with an industry standard Serial Peripheral Interface (SPI). It is
designed to serve as an Ethernet network interface for any controller equipped with SPI.
The ENC24J600 meets all of the IEEE 802.3 specications applicable to 10Base-T and 100Base-TX Ethernet. It
incorporates a number of packet ltering schemes to limit incoming packets. It also provides an internal, 16-bit wide
DMA module for fast data throughput and hardware assisted IP checksum calculations. Communication with the host
controller is implemented via two interrupt pins and the SPI, with data rates of 10/100 Mb/s. Two dedicated pins are
used for LED link and network activity indication.
This library is designed to simplify handling of the underlying hardware (ENC24J600). It works with any PIC32 with
integrated SPI and more than 4 Kb ROM memory. 38 to 40 MHz clock is recommended to get from 8 to 10 Mhz SPI
clock, otherwise PIC32 should be clocked by ENC24J600 clock output due to its silicon bug in SPI hardware. If you try
lower PIC32 clock speed, there might be board hang or miss some requests.
SPI Ethernet ENC24J600 library supports:
- IPv4 protocol.
- ARP requests.
- ICMP echo requests.
- UDP requests.
- TCP requests (no stack, no packet reconstruction).
- ARP client with cache.
- DNS client.
- UDP client.
- DHCP client.
- packet fragmentation is NOT supported.
Important:
- Global library variable SPI_Ethernet_24j600_userTimerSec is used to keep track of time for all client
implementations (ARP, DNS, UDP and DHCP). It is user responsibility to increment this variable each second in it’s
code if any of the clients is used.
- For advanced users there are header les (“__EthEnc24j600.h” and “__EthEnc24j600Private.h”) in Uses
folder of the compiler with description of all routines and global variables, relevant to the user, implemented in the SPI
Ethernet ENC24J600 Library.
- The appropriate hardware SPI module must be initialized before using any of the SPI Ethernet ENC24J600 library
routines. Refer to SPI Library.
- For MCUs with multiple SPI modules it is possible to initialize them and then switch by using the SPI_Set_Active()
routine.
Library Dependency Tree