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Sample

API Modules

Appendix B

B-13

/*****************************************************************************

* PURPOSE: This function will transmit notification of a new command

* block awaiting processing by the PLC-5/40V. Prior to calling

* this function, the programmer must copy the command block

* into VME memory.

* INPUT: ULONG baseAddress contains the base address of the PLC-5/40V.

* ULONG vmeCmdBlkAddr contains the VME address of the command

* block.

* VME_ADDRESS_MODIFIER_TYPE addrSpace contains an indicator

* as to which address space contains the command block.

* OUTPUT: PLC540V_STATUS_TYPE *status will contain the final status

* of requesting this function. This status could be and EPC

* or PLC-5/40V value.

* RETURNS: Nothing.

* EXAMPLE:

* ULONG baseAddress = 0xFC00;

* ULONG vmeCmdBlkAddr = 0x80000;

* VME_ADDRESS_MODIFIER_TYPE addrSpace = kVME_A24_ADDR_SPACE;

* PLC540V_STATUS_TYPE *status;

* plc540v_send_cmd(baseAddress,

* vmeCmdBlkAddr,

* addrSpace,

* &status);

* Copyright Allen-Bradley Company, Inc. 1993

****************************************************************************/

void plc540v_send_cmd(ULONG baseAddress,

ULONG vmeCmdBlkAddr,

VME_ADDRESS_MODIFIER_TYPE addrSpace,

PLC540V_STATUS_TYPE *status)

{

/* The command word. */

ULONG command = 0;

/* The value read from the command control register. */

UWORD cmdctlReg = 0;

/* Let’s initialize the status variable to success. */

memset((char *) status, 0x0, sizeof(PLC540V_STATUS_TYPE));

/* Build the command word. */

if (addrSpace == kVME_A24_ADDR_SPACE)

command = 0x00000000L | (vmeCmdBlkAddr & 0x00FFFFFFL);

else

command = 0x01000000L | (vmeCmdBlkAddr & 0x0000FFFFL);

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