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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

sub procedure Spi_Ethernet_Enable(dim enFlt as byte)

Nothing. 

This is MAC module routine. This routine enables appropriate network traffic on
the ENC28J60 module by the means of it's receive filters (unicast, multicast,
broadcast, crc). Specific type of network traffic will be enabled if a correspon-
ding bit of this routine's input parameter is set. Therefore, more than one type of
network traffic can be enabled at the same time. For this purpose, predefined
library constants (see the table below) can be ORed to form appropriate input
value. 

Parameters:

- 

enFlt:

network traffic/receive filter flags. Each bit corresponds to the 

appropriate network traffic/receive filter: 

0

0x01

MAC Broadcast traffic/receive filter
flag. When set, MAC broadcast
traffic will be enabled. 

Spi_Ethernet_BROADCAST

1

0x02

MAC Multicast traffic/receive filter
flag. When set, MAC multicast traf-
fic will be enabled. 

Spi_Ethernet_MULTICAST

2

0x04

not used

none

3

0x08

not used

none

4

0x10

not used

none

5

0x20

CRC check flag. When set, pack-
ets with invalid CRC field will be
discarded.

Spi_Ethernet_CRC

6

0x40

not used

none

7

0x80

MAC Unicast traffic/receive filter
flag. When set, MAC unicast traffic
will be enabled. 

Spi_Ethernet_UNICAST