GRSPW datasheet(40/48 Pages) ACTEL

40 / 48 page

GRSPW / GRSPW-FT

December 2008, Version 1.0.2

GAISLER

int spw_checkrx(int *size, struct rxstatus *rxs, struct spwvars *spw);

Checks if a packet has been received. When a packet has been received the size in bytes will be stored

in the size parameter and status is found in the rxs struct. A pointer in the spwvars struct is used to

keep track of the location in the descriptor table to poll. It is incremented each time the function

returns nonzero.

int spw_checktx(struct spwvars *spw);

Table 51. Parameters for spw_rx

Parameter

Description

Allowed range

buf

Pointer to the data area.

spw

Pointer to the spwvars struct associated with GRSPW core that

should receive the packet

Table 52. Return values for spw_checkrx

Value

Description

No packet has been received

A packet has been received

Table 53. Parameters for spw_checkrx

Parameter

Description

Allowed range

size

When the function returns 1 this variable holds the number of bytes

received

rxs

When the function returns 1 this variable holds status information

spw

Pointer to the spwvars struct associated with GRSPW core that

should be polled

Table 54. The rxstatus struct

Field

Description

Allowed range

truncated

Packet was truncated

0 - 1

dcrcerr

Data CRC error bit was set. Only indicates an error if the packet

received was an RMAP packet.

0 - 1

hcrcerr

Header CRC error bit was se.t. Only indicates an error if the packet

received was an RMAP packet.

0 - 1

eep

Packet was terminated with EEP

0 - 1

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