The code snipet below shows how I am configuring a 16 bit port (Ports 0 and 1). Just for a bit more detail, the Radar system that the 6537
is attached to is programmed with a simple I/O board. There is no driver involved, so I manually watch the handshake lines to know how
and when to transfer data to the 6537 device. The radar does the following:
1) Wait for ACK1 LOW
2) Put 16 bits of data on lines
3) Pull REQ1 HIGH
4) Wait ACK1 HIGH
5) Pull REQ1 LOW
6) Wait ACK1 LOW
7) Put 16 bits of data on lines
😎 Pull REQ1 HIGH
and so on for a finite number of samples.
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/*******************************************************************/
BOOL InitDio_32HS ()
/*******************************************************************/
{
static short iDevice = 1;
static short iGroup1 = 1;
static short iGroup2 = 2;
static short iGroupSize2 = 2;
static short iMode = 0;
static short iPort0 = 0;
static short iDirIn = 0;
static short iDirOut = 1;
static short iLatched = 1;
static short iIgnoreWarning = 0;
static short iYieldON = 1;
static short iProtocol = 1; // 0=Level-ACK
// 1=Pulsed-ACK
// 2=Pulsed-ACK (long pulse)
// 3=Burst
// 4=8255 emulation
static short iEdge = 0; // 0=Leading edge
// 1=Trailing edge
static short iReqPol = 0; // 0=Active high
// 1=Active low (inverted)
static short iAckPol = 0; // 0=Active high
// 1=Active low (inverted)
static short iAckDelayTime = 0; // 0= 0 ns
// 1=100 ns
// |
// 7=700 ns
// DMA Setup
// Configure group of ports (A, B) as input, with handshaking.
iStatus = DIG_Grp_Config(iDevice, iGroup1, iGroupSize2, iPort0, iDirIn);
iRetVal = NIDAQErrorHandler(iStatus, "DIG_Grp_Config",iIgnoreWarning);
iStatus = DIG_Grp_Mode(iDevice, iGroup1, iProtocol, iEdge,
iReqPol, iAckPol, iAckDelayTime);
iRetVal = NIDAQErrorHandler(iStatus, "DIG_Grp_Mode",iIgnoreWarning);
iStatus = Set_DAQ_Device_Info(iDevice, ND_DATA_XFER_MODE_DIO_GR1,
ND_UP_TO_1_DMA_CHANNEL); // PCI-DIO32HS
iRetVal = NIDAQErrorHandler(iStatus, "Set_DAQ_Device_Info",iIgnoreWarning);
iStatus = Config_DAQ_Event_Message(iDevice, 1, "DI0", 2, 0, 0, 0, 0, 0,
0, 0, (LPARAM)Event_Proc);
iRetVal = NIDAQErrorHandler(iStatus, "DIG_Prt_Config",iIgnoreWarning);
}
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Thanks for any insight.
