GRSPW datasheet(39/48 Pages) ACTEL

39 / 48 page

GRSPW / GRSPW-FT

December 2008, Version 1.0.2

GAISLER

int spw_tx(int crc, int skipcrcsize, int hsize, char *hbuf, int dsize, char *dbuf, struct

spwvars *spw);

Transmits a packet. Separate header and data buffers can be used. If CRC logic is available the GSPW

inserts RMAP CRC values after the header and data fields if crc is set to one. This function only sets a

descriptor and initiates the transmission. Spw_checktx must be used to check if the packet has been

transmitted. A pointer into the descriptor table is stored in the spwvars struct to keep track of the next

location to use. It is incremented each time the function returns 0.

int spw_rx(char *buf, struct spwvars *spw);

Enables a descriptor for reception. The packet will be stored to buf. Spw_checkrx must be used to

check if a packet has been received. A pointer in the spwvars struct is used to keep track of the next

location to use in the descriptor table. It is incremented each time the function returns 0.

Table 47. Parameters for spw_set_rxmaxlength

Parameter

Description

Allowed range

spw

Pointer to the spwvars struct associated with GRSPW core that

should be configured

Table 48. Return values for spw_tx

Value

Description

The function completed successfully

There are no free transmit descriptors currently available

There was illegal parameters passed to the function

Table 49. Parameters for spw_tx

Parameter

Description

Allowed range

crc

Set to one to append RMAP CRC after the header and data fields.

Only available if hardware CRC is available in the core.

0 - 1

skipcrcsize

The number of bytes in the beginning of a packet that should not be

included in the CRC calculation

0 - 15

hsize

The size of the header in bytes

0 - 255

hbuf

Pointer to the header data

dsize

The size of the data field in bytes

0 - 224-1

dbuf

Pointer to the data area.

spw

Pointer to the spwvars struct associated with GRSPW core that

should transmit the packet

Table 50. Return values for spw_rx

Value

Description

The function completed successfully

There are no free receive descriptors currently available

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