RadiSys 6200plus Series Manual do Utilizador descarregar pdf (Página 172)

Sample

API Modules

Appendix B

B-14

/* The PLC-5/40V’s command/control register WRITE-READY bit

indicates when it is ready to accept a new command. We

will poll this bit until it is set or we timeout.

poll_plc540v_cmdctrl_bits(baseAddress, kCMDCTRL_WRDY, status);

if (status->plc540vStatus == kPLC540V_SUCCESS)

{

/* The PLC-5/40V command word is 32 bits wide. However, the VME

interface to the command word is only 16 bits wide so we must

write the command word as two 16 bit chunks. These words must

be written MSW and then LSW.

write_plc540v_register(baseAddress, kPLC540V_CH_REG,

HIWORD(command), status);

write_plc540v_register(baseAddress, kPLC540V_CL_REG,

LOWORD(command), status);

poll_plc540v_cmdctrl_bits(baseAddress, kCMDCTRL_WRDY, status);

if (status->plc540vStatus == kPLC540V_SUCCESS)

{

/* The PLC-5/40V has now started processing the command word.

We will chech the command control register’s ERROR bit to

see if this command word caused any PLC-5/40V errors. If

so, we will extract the 8 bit error code from the command

control register.

read_plc540v_register(baseAddress, kPLC540V_CC_REG,

&cmdctlReg, status);

if (status->plc540vStatus == kPLC540V_SUCCESS)

{

/* Determine if the bit is set. */

if (cmdctlReg & kCMDCTRL_ERR)

{

/* Extract the error code. */

status->plc540vStatus = cmdctlReg & 0x00FF;

status->statusCategory = kPLC540V_STATUS;

}

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RadiSys 6200plus Series Manual do Utilizador Página 172