GRSPW datasheet(35/48 Pages) ACTEL

35 / 48 page

GRSPW / GRSPW-FT

December 2008, Version 1.0.2

GAISLER

Used for setting the different parameters in the spwvars struct. Should always be run first after creat-

ing a spwvars struct. This function only initializes the struct. Does not write anything to the

SpaceWire core.

int spw_init(struct spwvars *spw);

Initializes the GRSPW core located at the address set in the struct spw. Sets the following registers:

node address, destination key, clock divisor, receiver maximum length, transmitter descriptor table

address, receiver descriptor table address, ctrl and dmactrl. All bits are set to the values found in the

spwvars struct. If a register bit is not present in the struct it will be set to zero. The descriptor tables

are allocated to an aligned area using malloc. The status register is cleared and lastly the link interface

is enabled. The run state frequency will be set according to the value in clkdiv.

Table 30. Return values for spw_setparam

Value

Description

The function completed successfully

One or more of the parameters had an illegal value

Table 31. Parameters for spw_setparam

Parameter

Description

Allowed range

nodeaddr

Sets the node address value of the struct spw passed to the function.

0-255

clkdiv

Sets the clock divisor value of the struct spw passed to the function.

0-255

destkey

Sets the destination key of the struct spw passed to the function.

0-255

nospill

Sets the nospill value of the struct spw passed to the function.

0 - 1

timetxen

Sets the timetxen value of the struct spw passed to the function.

0 - 1

timerxen

Sets the timerxen value of the struct spw passed to the function.

0 - 1

rxmaxlen

Sets the receiver maximum length field of the struct spw passed to

the function.

0 - 225-1

spwadr

Sets the address to the GRSPW core which will be associated with

the struct passed to the function.

0 - 232-1

Table 32. Return values for spw_init

Value

Description

The function completed successfully

One or more of the parameters could not be set correctly or the link failed to initialize.

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